/*
* pg_connection.c - PG::Connection class extension
* $Id: pg_connection.c,v a7befacdef4e 2014/12/12 20:57:14 lars $
*
*/
#include "pg.h"
/* Number of bytes that are reserved on the stack for query params. */
#define QUERYDATA_BUFFER_SIZE 4000
VALUE rb_cPGconn;
static ID s_id_encode;
static VALUE sym_type, sym_format, sym_value;
static PQnoticeReceiver default_notice_receiver = NULL;
static PQnoticeProcessor default_notice_processor = NULL;
static VALUE pgconn_finish( VALUE );
#ifdef M17N_SUPPORTED
static VALUE pgconn_set_default_encoding( VALUE self );
void pgconn_set_internal_encoding_index( VALUE );
#endif
#ifndef HAVE_RB_THREAD_FD_SELECT
#define rb_fdset_t fd_set
#define rb_fd_init(f)
#define rb_fd_zero(f) FD_ZERO(f)
#define rb_fd_set(n, f) FD_SET(n, f)
#define rb_fd_term(f)
#define rb_thread_fd_select rb_thread_select
#endif
/*
* Global functions
*/
/*
* Fetch the PG::Connection object data pointer.
*/
t_pg_connection *
pg_get_connection( VALUE self )
{
t_pg_connection *this;
Data_Get_Struct( self, t_pg_connection, this);
return this;
}
/*
* Fetch the PG::Connection object data pointer and check it's
* PGconn data pointer for sanity.
*/
t_pg_connection *
pg_get_connection_safe( VALUE self )
{
t_pg_connection *this;
Data_Get_Struct( self, t_pg_connection, this);
if ( !this->pgconn )
rb_raise( rb_eConnectionBad, "connection is closed" );
return this;
}
/*
* Fetch the PGconn data pointer and check it for sanity.
*
* Note: This function is used externally by the sequel_pg gem,
* so do changes carefully.
*
*/
PGconn *
pg_get_pgconn( VALUE self )
{
t_pg_connection *this;
Data_Get_Struct( self, t_pg_connection, this);
if ( !this->pgconn )
rb_raise( rb_eConnectionBad, "connection is closed" );
return this->pgconn;
}
/*
* Close the associated socket IO object if there is one.
*/
void
pgconn_close_socket_io( VALUE self )
{
t_pg_connection *this = pg_get_connection( self );
VALUE socket_io = this->socket_io;
if ( RTEST(socket_io) ) {
#if defined(_WIN32) && defined(HAVE_RB_W32_WRAP_IO_HANDLE)
int ruby_sd = NUM2INT(rb_funcall( socket_io, rb_intern("fileno"), 0 ));
if( rb_w32_unwrap_io_handle(ruby_sd) ){
rb_raise(rb_eConnectionBad, "Could not unwrap win32 socket handle");
}
#endif
rb_funcall( socket_io, rb_intern("close"), 0 );
}
this->socket_io = Qnil;
}
/*
* Create a Ruby Array of Hashes out of a PGconninfoOptions array.
*/
static VALUE
pgconn_make_conninfo_array( const PQconninfoOption *options )
{
VALUE ary = rb_ary_new();
VALUE hash;
int i = 0;
if (!options) return Qnil;
for(i = 0; options[i].keyword != NULL; i++) {
hash = rb_hash_new();
if(options[i].keyword)
rb_hash_aset(hash, ID2SYM(rb_intern("keyword")), rb_str_new2(options[i].keyword));
if(options[i].envvar)
rb_hash_aset(hash, ID2SYM(rb_intern("envvar")), rb_str_new2(options[i].envvar));
if(options[i].compiled)
rb_hash_aset(hash, ID2SYM(rb_intern("compiled")), rb_str_new2(options[i].compiled));
if(options[i].val)
rb_hash_aset(hash, ID2SYM(rb_intern("val")), rb_str_new2(options[i].val));
if(options[i].label)
rb_hash_aset(hash, ID2SYM(rb_intern("label")), rb_str_new2(options[i].label));
if(options[i].dispchar)
rb_hash_aset(hash, ID2SYM(rb_intern("dispchar")), rb_str_new2(options[i].dispchar));
rb_hash_aset(hash, ID2SYM(rb_intern("dispsize")), INT2NUM(options[i].dispsize));
rb_ary_push(ary, hash);
}
return ary;
}
/*
* GC Mark function
*/
static void
pgconn_gc_mark( t_pg_connection *this )
{
rb_gc_mark( this->socket_io );
rb_gc_mark( this->notice_receiver );
rb_gc_mark( this->notice_processor );
rb_gc_mark( this->type_map_for_queries );
rb_gc_mark( this->type_map_for_results );
rb_gc_mark( this->trace_stream );
rb_gc_mark( this->external_encoding );
rb_gc_mark( this->encoder_for_put_copy_data );
rb_gc_mark( this->decoder_for_get_copy_data );
}
/*
* GC Free function
*/
static void
pgconn_gc_free( t_pg_connection *this )
{
if (this->pgconn != NULL)
PQfinish( this->pgconn );
xfree(this);
}
/**************************************************************************
* Class Methods
**************************************************************************/
/*
* Document-method: allocate
*
* call-seq:
* PG::Connection.allocate -> conn
*/
static VALUE
pgconn_s_allocate( VALUE klass )
{
t_pg_connection *this;
VALUE self = Data_Make_Struct( klass, t_pg_connection, pgconn_gc_mark, pgconn_gc_free, this );
this->pgconn = NULL;
this->socket_io = Qnil;
this->notice_receiver = Qnil;
this->notice_processor = Qnil;
this->type_map_for_queries = pg_typemap_all_strings;
this->type_map_for_results = pg_typemap_all_strings;
this->encoder_for_put_copy_data = Qnil;
this->decoder_for_get_copy_data = Qnil;
this->trace_stream = Qnil;
this->external_encoding = Qnil;
return self;
}
/*
* Document-method: new
*
* call-seq:
* PG::Connection.new -> conn
* PG::Connection.new(connection_hash) -> conn
* PG::Connection.new(connection_string) -> conn
* PG::Connection.new(host, port, options, tty, dbname, user, password) -> conn
*
* Create a connection to the specified server.
*
* [+host+]
* server hostname
* [+hostaddr+]
* server address (avoids hostname lookup, overrides +host+)
* [+port+]
* server port number
* [+dbname+]
* connecting database name
* [+user+]
* login user name
* [+password+]
* login password
* [+connect_timeout+]
* maximum time to wait for connection to succeed
* [+options+]
* backend options
* [+tty+]
* (ignored in newer versions of PostgreSQL)
* [+sslmode+]
* (disable|allow|prefer|require)
* [+krbsrvname+]
* kerberos service name
* [+gsslib+]
* GSS library to use for GSSAPI authentication
* [+service+]
* service name to use for additional parameters
*
* Examples:
*
* # Connect using all defaults
* PG::Connection.new
*
* # As a Hash
* PG::Connection.new( :dbname => 'test', :port => 5432 )
*
* # As a String
* PG::Connection.new( "dbname=test port=5432" )
*
* # As an Array
* PG::Connection.new( nil, 5432, nil, nil, 'test', nil, nil )
*
* If the Ruby default internal encoding is set (i.e., Encoding.default_internal != nil), the
* connection will have its +client_encoding+ set accordingly.
*
* Raises a PG::Error if the connection fails.
*/
static VALUE
pgconn_init(int argc, VALUE *argv, VALUE self)
{
t_pg_connection *this;
VALUE conninfo;
VALUE error;
this = pg_get_connection( self );
conninfo = rb_funcall2( rb_cPGconn, rb_intern("parse_connect_args"), argc, argv );
this->pgconn = gvl_PQconnectdb(StringValueCStr(conninfo));
if(this->pgconn == NULL)
rb_raise(rb_ePGerror, "PQconnectdb() unable to allocate structure");
if (PQstatus(this->pgconn) == CONNECTION_BAD) {
error = rb_exc_new2(rb_eConnectionBad, PQerrorMessage(this->pgconn));
rb_iv_set(error, "@connection", self);
rb_exc_raise(error);
}
#ifdef M17N_SUPPORTED
pgconn_set_default_encoding( self );
#endif
if (rb_block_given_p()) {
return rb_ensure(rb_yield, self, pgconn_finish, self);
}
return self;
}
/*
* call-seq:
* PG::Connection.connect_start(connection_hash) -> conn
* PG::Connection.connect_start(connection_string) -> conn
* PG::Connection.connect_start(host, port, options, tty, dbname, login, password) -> conn
*
* This is an asynchronous version of PG::Connection.connect().
*
* Use #connect_poll to poll the status of the connection.
*
* NOTE: this does *not* set the connection's +client_encoding+ for you if
* Encoding.default_internal is set. To set it after the connection is established,
* call #internal_encoding=. You can also set it automatically by setting
* ENV['PGCLIENTENCODING'], or include the 'options' connection parameter.
*
*/
static VALUE
pgconn_s_connect_start( int argc, VALUE *argv, VALUE klass )
{
VALUE rb_conn;
VALUE conninfo;
VALUE error;
t_pg_connection *this;
/*
* PG::Connection.connect_start must act as both alloc() and initialize()
* because it is not invoked by calling new().
*/
rb_conn = pgconn_s_allocate( klass );
this = pg_get_connection( rb_conn );
conninfo = rb_funcall2( klass, rb_intern("parse_connect_args"), argc, argv );
this->pgconn = gvl_PQconnectStart( StringValueCStr(conninfo) );
if( this->pgconn == NULL )
rb_raise(rb_ePGerror, "PQconnectStart() unable to allocate structure");
if ( PQstatus(this->pgconn) == CONNECTION_BAD ) {
error = rb_exc_new2(rb_eConnectionBad, PQerrorMessage(this->pgconn));
rb_iv_set(error, "@connection", rb_conn);
rb_exc_raise(error);
}
if ( rb_block_given_p() ) {
return rb_ensure( rb_yield, rb_conn, pgconn_finish, rb_conn );
}
return rb_conn;
}
#ifdef HAVE_PQPING
/*
* call-seq:
* PG::Connection.ping(connection_hash) -> Fixnum
* PG::Connection.ping(connection_string) -> Fixnum
* PG::Connection.ping(host, port, options, tty, dbname, login, password) -> Fixnum
*
* Check server status.
*
* Returns one of:
* [+PQPING_OK+]
* server is accepting connections
* [+PQPING_REJECT+]
* server is alive but rejecting connections
* [+PQPING_NO_RESPONSE+]
* could not establish connection
* [+PQPING_NO_ATTEMPT+]
* connection not attempted (bad params)
*/
static VALUE
pgconn_s_ping( int argc, VALUE *argv, VALUE klass )
{
PGPing ping;
VALUE conninfo;
conninfo = rb_funcall2( klass, rb_intern("parse_connect_args"), argc, argv );
ping = PQping( StringValueCStr(conninfo) );
return INT2FIX((int)ping);
}
#endif
/*
* Document-method: conndefaults
*
* call-seq:
* PG::Connection.conndefaults() -> Array
*
* Returns an array of hashes. Each hash has the keys:
* [+:keyword+]
* the name of the option
* [+:envvar+]
* the environment variable to fall back to
* [+:compiled+]
* the compiled in option as a secondary fallback
* [+:val+]
* the option's current value, or +nil+ if not known
* [+:label+]
* the label for the field
* [+:dispchar+]
* "" for normal, "D" for debug, and "*" for password
* [+:dispsize+]
* field size
*/
static VALUE
pgconn_s_conndefaults(VALUE self)
{
PQconninfoOption *options = PQconndefaults();
VALUE array = pgconn_make_conninfo_array( options );
PQconninfoFree(options);
UNUSED( self );
return array;
}
/*
* call-seq:
* PG::Connection.encrypt_password( password, username ) -> String
*
* This function is intended to be used by client applications that
* send commands like: +ALTER USER joe PASSWORD 'pwd'+.
* The arguments are the cleartext password, and the SQL name
* of the user it is for.
*
* Return value is the encrypted password.
*/
static VALUE
pgconn_s_encrypt_password(VALUE self, VALUE password, VALUE username)
{
char *encrypted = NULL;
VALUE rval = Qnil;
UNUSED( self );
Check_Type(password, T_STRING);
Check_Type(username, T_STRING);
encrypted = PQencryptPassword(StringValueCStr(password), StringValueCStr(username));
rval = rb_str_new2( encrypted );
PQfreemem( encrypted );
OBJ_INFECT( rval, password );
OBJ_INFECT( rval, username );
return rval;
}
/**************************************************************************
* PG::Connection INSTANCE METHODS
**************************************************************************/
/*
* call-seq:
* conn.connect_poll() -> Fixnum
*
* Returns one of:
* [+PGRES_POLLING_READING+]
* wait until the socket is ready to read
* [+PGRES_POLLING_WRITING+]
* wait until the socket is ready to write
* [+PGRES_POLLING_FAILED+]
* the asynchronous connection has failed
* [+PGRES_POLLING_OK+]
* the asynchronous connection is ready
*
* Example:
* conn = PG::Connection.connect_start("dbname=mydatabase")
* socket = conn.socket_io
* status = conn.connect_poll
* while(status != PG::PGRES_POLLING_OK) do
* # do some work while waiting for the connection to complete
* if(status == PG::PGRES_POLLING_READING)
* if(not select([socket], [], [], 10.0))
* raise "Asynchronous connection timed out!"
* end
* elsif(status == PG::PGRES_POLLING_WRITING)
* if(not select([], [socket], [], 10.0))
* raise "Asynchronous connection timed out!"
* end
* end
* status = conn.connect_poll
* end
* # now conn.status == CONNECTION_OK, and connection
* # is ready.
*/
static VALUE
pgconn_connect_poll(VALUE self)
{
PostgresPollingStatusType status;
status = gvl_PQconnectPoll(pg_get_pgconn(self));
return INT2FIX((int)status);
}
/*
* call-seq:
* conn.finish
*
* Closes the backend connection.
*/
static VALUE
pgconn_finish( VALUE self )
{
t_pg_connection *this = pg_get_connection_safe( self );
pgconn_close_socket_io( self );
PQfinish( this->pgconn );
this->pgconn = NULL;
return Qnil;
}
/*
* call-seq:
* conn.finished? -> boolean
*
* Returns +true+ if the backend connection has been closed.
*/
static VALUE
pgconn_finished_p( VALUE self )
{
t_pg_connection *this = pg_get_connection( self );
if ( this->pgconn ) return Qfalse;
return Qtrue;
}
/*
* call-seq:
* conn.reset()
*
* Resets the backend connection. This method closes the
* backend connection and tries to re-connect.
*/
static VALUE
pgconn_reset( VALUE self )
{
pgconn_close_socket_io( self );
gvl_PQreset( pg_get_pgconn(self) );
return self;
}
/*
* call-seq:
* conn.reset_start() -> nil
*
* Initiate a connection reset in a nonblocking manner.
* This will close the current connection and attempt to
* reconnect using the same connection parameters.
* Use #reset_poll to check the status of the
* connection reset.
*/
static VALUE
pgconn_reset_start(VALUE self)
{
pgconn_close_socket_io( self );
if(gvl_PQresetStart(pg_get_pgconn(self)) == 0)
rb_raise(rb_eUnableToSend, "reset has failed");
return Qnil;
}
/*
* call-seq:
* conn.reset_poll -> Fixnum
*
* Checks the status of a connection reset operation.
* See #connect_start and #connect_poll for
* usage information and return values.
*/
static VALUE
pgconn_reset_poll(VALUE self)
{
PostgresPollingStatusType status;
status = gvl_PQresetPoll(pg_get_pgconn(self));
return INT2FIX((int)status);
}
/*
* call-seq:
* conn.db()
*
* Returns the connected database name.
*/
static VALUE
pgconn_db(VALUE self)
{
char *db = PQdb(pg_get_pgconn(self));
if (!db) return Qnil;
return rb_tainted_str_new2(db);
}
/*
* call-seq:
* conn.user()
*
* Returns the authenticated user name.
*/
static VALUE
pgconn_user(VALUE self)
{
char *user = PQuser(pg_get_pgconn(self));
if (!user) return Qnil;
return rb_tainted_str_new2(user);
}
/*
* call-seq:
* conn.pass()
*
* Returns the authenticated user name.
*/
static VALUE
pgconn_pass(VALUE self)
{
char *user = PQpass(pg_get_pgconn(self));
if (!user) return Qnil;
return rb_tainted_str_new2(user);
}
/*
* call-seq:
* conn.host()
*
* Returns the connected server name.
*/
static VALUE
pgconn_host(VALUE self)
{
char *host = PQhost(pg_get_pgconn(self));
if (!host) return Qnil;
return rb_tainted_str_new2(host);
}
#ifdef HAVE_PQHOSTADDR
/*
* call-seq:
* conn.hostaddr()
*
* Returns the server numeric IP address of the connection.
*/
static VALUE
pgconn_hostaddr(VALUE self)
{
char *hostaddr = PQhostaddr(pg_get_pgconn(self));
if (!hostaddr) return Qnil;
return rb_tainted_str_new2(hostaddr);
}
#endif
/*
* call-seq:
* conn.port()
*
* Returns the connected server port number.
*/
static VALUE
pgconn_port(VALUE self)
{
char* port = PQport(pg_get_pgconn(self));
return INT2NUM(atol(port));
}
/*
* call-seq:
* conn.tty()
*
* Returns the connected pgtty. (Obsolete)
*/
static VALUE
pgconn_tty(VALUE self)
{
char *tty = PQtty(pg_get_pgconn(self));
if (!tty) return Qnil;
return rb_tainted_str_new2(tty);
}
/*
* call-seq:
* conn.options()
*
* Returns backend option string.
*/
static VALUE
pgconn_options(VALUE self)
{
char *options = PQoptions(pg_get_pgconn(self));
if (!options) return Qnil;
return rb_tainted_str_new2(options);
}
#ifdef HAVE_PQCONNINFO
/*
* call-seq:
* conn.conninfo -> hash
*
* Returns the connection options used by a live connection.
*
*/
static VALUE
pgconn_conninfo( VALUE self )
{
PGconn *conn = pg_get_pgconn(self);
PQconninfoOption *options = PQconninfo( conn );
VALUE array = pgconn_make_conninfo_array( options );
PQconninfoFree(options);
return array;
}
#endif
/*
* call-seq:
* conn.status()
*
* Returns status of connection : CONNECTION_OK or CONNECTION_BAD
*/
static VALUE
pgconn_status(VALUE self)
{
return INT2NUM(PQstatus(pg_get_pgconn(self)));
}
/*
* call-seq:
* conn.transaction_status()
*
* returns one of the following statuses:
* PQTRANS_IDLE = 0 (connection idle)
* PQTRANS_ACTIVE = 1 (command in progress)
* PQTRANS_INTRANS = 2 (idle, within transaction block)
* PQTRANS_INERROR = 3 (idle, within failed transaction)
* PQTRANS_UNKNOWN = 4 (cannot determine status)
*/
static VALUE
pgconn_transaction_status(VALUE self)
{
return INT2NUM(PQtransactionStatus(pg_get_pgconn(self)));
}
/*
* call-seq:
* conn.parameter_status( param_name ) -> String
*
* Returns the setting of parameter _param_name_, where
* _param_name_ is one of
* * +server_version+
* * +server_encoding+
* * +client_encoding+
* * +is_superuser+
* * +session_authorization+
* * +DateStyle+
* * +TimeZone+
* * +integer_datetimes+
* * +standard_conforming_strings+
*
* Returns nil if the value of the parameter is not known.
*/
static VALUE
pgconn_parameter_status(VALUE self, VALUE param_name)
{
const char *ret = PQparameterStatus(pg_get_pgconn(self), StringValueCStr(param_name));
if(ret == NULL)
return Qnil;
else
return rb_tainted_str_new2(ret);
}
/*
* call-seq:
* conn.protocol_version -> Integer
*
* The 3.0 protocol will normally be used when communicating with PostgreSQL 7.4
* or later servers; pre-7.4 servers support only protocol 2.0. (Protocol 1.0 is
* obsolete and not supported by libpq.)
*/
static VALUE
pgconn_protocol_version(VALUE self)
{
return INT2NUM(PQprotocolVersion(pg_get_pgconn(self)));
}
/*
* call-seq:
* conn.server_version -> Integer
*
* The number is formed by converting the major, minor, and revision
* numbers into two-decimal-digit numbers and appending them together.
* For example, version 7.4.2 will be returned as 70402, and version
* 8.1 will be returned as 80100 (leading zeroes are not shown). Zero
* is returned if the connection is bad.
*
*/
static VALUE
pgconn_server_version(VALUE self)
{
return INT2NUM(PQserverVersion(pg_get_pgconn(self)));
}
/*
* call-seq:
* conn.error_message -> String
*
* Returns the error message about connection.
*/
static VALUE
pgconn_error_message(VALUE self)
{
char *error = PQerrorMessage(pg_get_pgconn(self));
if (!error) return Qnil;
return rb_tainted_str_new2(error);
}
/*
* call-seq:
* conn.socket() -> Fixnum
*
* Returns the socket's file descriptor for this connection.
* IO.for_fd() can be used to build a proper IO object to the socket.
* If you do so, you will likely also want to set autoclose=false
* on it to prevent Ruby from closing the socket to PostgreSQL if it
* goes out of scope. Alternatively, you can use #socket_io, which
* creates an IO that's associated with the connection object itself,
* and so won't go out of scope until the connection does.
*
* *Note:* On Windows the file descriptor is not really usable,
* since it can not be used to build a Ruby IO object.
*/
static VALUE
pgconn_socket(VALUE self)
{
int sd;
if( (sd = PQsocket(pg_get_pgconn(self))) < 0)
rb_raise(rb_eConnectionBad, "PQsocket() can't get socket descriptor");
return INT2NUM(sd);
}
#if !defined(_WIN32) || defined(HAVE_RB_W32_WRAP_IO_HANDLE)
/*
* call-seq:
* conn.socket_io() -> IO
*
* Fetch a memoized IO object created from the Connection's underlying socket.
* This object can be used for IO.select to wait for events while running
* asynchronous API calls.
*
* Using this instead of #socket avoids the problem of the underlying connection
* being closed by Ruby when an IO created using IO.for_fd(conn.socket)
* goes out of scope.
*
* This method can also be used on Windows but requires Ruby-2.0+.
*/
static VALUE
pgconn_socket_io(VALUE self)
{
int sd;
int ruby_sd;
ID id_autoclose = rb_intern("autoclose=");
t_pg_connection *this = pg_get_connection_safe( self );
VALUE socket_io = this->socket_io;
if ( !RTEST(socket_io) ) {
if( (sd = PQsocket(this->pgconn)) < 0)
rb_raise(rb_eConnectionBad, "PQsocket() can't get socket descriptor");
#ifdef _WIN32
ruby_sd = rb_w32_wrap_io_handle((HANDLE)(intptr_t)sd, O_RDWR|O_BINARY|O_NOINHERIT);
#else
ruby_sd = sd;
#endif
socket_io = rb_funcall( rb_cIO, rb_intern("for_fd"), 1, INT2NUM(ruby_sd) );
/* Disable autoclose feature, when supported */
if( rb_respond_to(socket_io, id_autoclose) ){
rb_funcall( socket_io, id_autoclose, 1, Qfalse );
}
this->socket_io = socket_io;
}
return socket_io;
}
#endif
/*
* call-seq:
* conn.backend_pid() -> Fixnum
*
* Returns the process ID of the backend server
* process for this connection.
* Note that this is a PID on database server host.
*/
static VALUE
pgconn_backend_pid(VALUE self)
{
return INT2NUM(PQbackendPID(pg_get_pgconn(self)));
}
/*
* call-seq:
* conn.connection_needs_password() -> Boolean
*
* Returns +true+ if the authentication method required a
* password, but none was available. +false+ otherwise.
*/
static VALUE
pgconn_connection_needs_password(VALUE self)
{
return PQconnectionNeedsPassword(pg_get_pgconn(self)) ? Qtrue : Qfalse;
}
/*
* call-seq:
* conn.connection_used_password() -> Boolean
*
* Returns +true+ if the authentication method used
* a caller-supplied password, +false+ otherwise.
*/
static VALUE
pgconn_connection_used_password(VALUE self)
{
return PQconnectionUsedPassword(pg_get_pgconn(self)) ? Qtrue : Qfalse;
}
/* :TODO: get_ssl */
static VALUE pgconn_exec_params( int, VALUE *, VALUE );
/*
* call-seq:
* conn.exec(sql) -> PG::Result
* conn.exec(sql) {|pg_result| block }
*
* Sends SQL query request specified by _sql_ to PostgreSQL.
* Returns a PG::Result instance on success.
* On failure, it raises a PG::Error.
*
* For backward compatibility, if you pass more than one parameter to this method,
* it will call #exec_params for you. New code should explicitly use #exec_params if
* argument placeholders are used.
*
* If the optional code block is given, it will be passed result as an argument,
* and the PG::Result object will automatically be cleared when the block terminates.
* In this instance, conn.exec returns the value of the block.
*
* #exec is implemented on the synchronous command processing API of libpq, whereas
* #async_exec is implemented on the asynchronous API.
* #exec is somewhat faster that #async_exec, but blocks any signals to be processed until
* the query is finished. This is most notably visible by a delayed reaction to Control+C.
* Both methods ensure that other threads can process while waiting for the server to
* complete the request.
*/
static VALUE
pgconn_exec(int argc, VALUE *argv, VALUE self)
{
PGconn *conn = pg_get_pgconn(self);
PGresult *result = NULL;
VALUE rb_pgresult;
/* If called with no parameters, use PQexec */
if ( argc == 1 ) {
Check_Type(argv[0], T_STRING);
result = gvl_PQexec(conn, StringValueCStr(argv[0]));
rb_pgresult = pg_new_result(result, self);
pg_result_check(rb_pgresult);
if (rb_block_given_p()) {
return rb_ensure(rb_yield, rb_pgresult, pg_result_clear, rb_pgresult);
}
return rb_pgresult;
}
/* Otherwise, just call #exec_params instead for backward-compatibility */
else {
return pgconn_exec_params( argc, argv, self );
}
}
struct linked_typecast_data {
struct linked_typecast_data *next;
char data[0];
};
/* This struct is allocated on the stack for all query execution functions. */
struct query_params_data {
/*
* Filled by caller
*/
/* Is the query function to execute one with types array? */
int with_types;
/* Array of query params from user space */
VALUE params;
/* The typemap given from user space */
VALUE typemap;
/*
* Filled by alloc_query_params()
*/
/* Wraps the pointer of allocated memory, if function parameters dont't
* fit in the memory_pool below.
*/
VALUE heap_pool;
/* Pointer to the value string pointers (either within memory_pool or heap_pool).
* The value strings itself are either directly within RString memory or,
* in case of type casted values, within memory_pool or typecast_heap_chain.
*/
char **values;
/* Pointer to the param lengths (either within memory_pool or heap_pool) */
int *lengths;
/* Pointer to the format codes (either within memory_pool or heap_pool) */
int *formats;
/* Pointer to the OID types (either within memory_pool or heap_pool) */
Oid *types;
/* This array takes the string values for the timeframe of the query,
* if param value convertion is required
*/
VALUE gc_array;
/* Wraps a single linked list of allocated memory chunks for type casted params.
* Used when the memory_pool is to small.
*/
VALUE typecast_heap_chain;
/* This memory pool is used to place above query function parameters on it. */
char memory_pool[QUERYDATA_BUFFER_SIZE];
};
static void
free_typecast_heap_chain(struct linked_typecast_data *chain_entry)
{
while(chain_entry){
struct linked_typecast_data *next = chain_entry->next;
xfree(chain_entry);
chain_entry = next;
}
}
static char *
alloc_typecast_buf( VALUE *typecast_heap_chain, int len )
{
/* Allocate a new memory chunk from heap */
struct linked_typecast_data *allocated =
(struct linked_typecast_data *)xmalloc(sizeof(struct linked_typecast_data) + len);
/* Did we already wrap a memory chain per T_DATA object? */
if( NIL_P( *typecast_heap_chain ) ){
/* Leave free'ing of the buffer chain to the GC, when paramsData has left the stack */
*typecast_heap_chain = Data_Wrap_Struct( rb_cObject, NULL, free_typecast_heap_chain, allocated );
allocated->next = NULL;
} else {
/* Append to the chain */
allocated->next = DATA_PTR( *typecast_heap_chain );
DATA_PTR( *typecast_heap_chain ) = allocated;
}
return &allocated->data[0];
}
static int
alloc_query_params(struct query_params_data *paramsData)
{
VALUE param_value;
t_typemap *p_typemap;
int nParams;
int i=0;
t_pg_coder *conv;
unsigned int required_pool_size;
char *memory_pool;
Check_Type(paramsData->params, T_ARRAY);
p_typemap = DATA_PTR( paramsData->typemap );
p_typemap->funcs.fit_to_query( paramsData->typemap, paramsData->params );
paramsData->heap_pool = Qnil;
paramsData->typecast_heap_chain = Qnil;
paramsData->gc_array = Qnil;
nParams = (int)RARRAY_LEN(paramsData->params);
required_pool_size = nParams * (
sizeof(char *) +
sizeof(int) +
sizeof(int) +
(paramsData->with_types ? sizeof(Oid) : 0));
if( sizeof(paramsData->memory_pool) < required_pool_size ){
/* Allocate one combined memory pool for all possible function parameters */
memory_pool = (char*)xmalloc( required_pool_size );
/* Leave free'ing of the buffer to the GC, when paramsData has left the stack */
paramsData->heap_pool = Data_Wrap_Struct( rb_cObject, NULL, -1, memory_pool );
required_pool_size = 0;
}else{
/* Use stack memory for function parameters */
memory_pool = paramsData->memory_pool;
}
paramsData->values = (char **)memory_pool;
paramsData->lengths = (int *)((char*)paramsData->values + sizeof(char *) * nParams);
paramsData->formats = (int *)((char*)paramsData->lengths + sizeof(int) * nParams);
paramsData->types = (Oid *)((char*)paramsData->formats + sizeof(int) * nParams);
{
char *typecast_buf = paramsData->memory_pool + required_pool_size;
for ( i = 0; i < nParams; i++ ) {
param_value = rb_ary_entry(paramsData->params, i);
paramsData->formats[i] = 0;
if( paramsData->with_types )
paramsData->types[i] = 0;
/* Let the given typemap select a coder for this param */
conv = p_typemap->funcs.typecast_query_param(p_typemap, param_value, i);
/* Using a coder object for the param_value? Then set it's format code and oid. */
if( conv ){
paramsData->formats[i] = conv->format;
if( paramsData->with_types )
paramsData->types[i] = conv->oid;
} else {
/* No coder, but got we a hash form for the query param?
* Then take format code and oid from there. */
if (TYPE(param_value) == T_HASH) {
VALUE format_value = rb_hash_aref(param_value, sym_format);
if( !NIL_P(format_value) )
paramsData->formats[i] = NUM2INT(format_value);
if( paramsData->with_types ){
VALUE type_value = rb_hash_aref(param_value, sym_type);
if( !NIL_P(type_value) )
paramsData->types[i] = NUM2UINT(type_value);
}
param_value = rb_hash_aref(param_value, sym_value);
}
}
if( NIL_P(param_value) ){
paramsData->values[i] = NULL;
paramsData->lengths[i] = 0;
} else {
t_pg_coder_enc_func enc_func = pg_coder_enc_func( conv );
VALUE intermediate;
/* 1st pass for retiving the required memory space */
int len = enc_func(conv, param_value, NULL, &intermediate);
if( len == -1 ){
/* The intermediate value is a String that can be used directly. */
/* Ensure that the String object is zero terminated as expected by libpq. */
if( paramsData->formats[i] == 0 )
StringValueCStr(intermediate);
/* In case a new string object was generated, make sure it doesn't get freed by the GC */
if( intermediate != param_value ){
if( NIL_P(paramsData->gc_array) )
paramsData->gc_array = rb_ary_new();
rb_ary_push(paramsData->gc_array, intermediate);
}
paramsData->values[i] = RSTRING_PTR(intermediate);
paramsData->lengths[i] = RSTRING_LENINT(intermediate);
} else {
/* Is the stack memory pool too small to take the type casted value? */
if( sizeof(paramsData->memory_pool) < required_pool_size + len + 1){
typecast_buf = alloc_typecast_buf( ¶msData->typecast_heap_chain, len + 1 );
}
/* 2nd pass for writing the data to prepared buffer */
len = enc_func(conv, param_value, typecast_buf, &intermediate);
paramsData->values[i] = typecast_buf;
if( paramsData->formats[i] == 0 ){
/* text format strings must be zero terminated and lengths are ignored */
typecast_buf[len] = 0;
typecast_buf += len + 1;
required_pool_size += len + 1;
} else {
paramsData->lengths[i] = len;
typecast_buf += len;
required_pool_size += len;
}
}
RB_GC_GUARD(intermediate);
}
}
}
return nParams;
}
static void
free_query_params(struct query_params_data *paramsData)
{
/* currently nothing to free */
}
void
pgconn_query_assign_typemap( VALUE self, struct query_params_data *paramsData )
{
if(NIL_P(paramsData->typemap)){
/* Use default typemap for queries. It's type is checked when assigned. */
paramsData->typemap = pg_get_connection(self)->type_map_for_queries;
}else{
/* Check type of method param */
if ( !rb_obj_is_kind_of(paramsData->typemap, rb_cTypeMap) ) {
rb_raise( rb_eTypeError, "wrong argument type %s (expected kind of PG::TypeMap)",
rb_obj_classname( paramsData->typemap ) );
}
Check_Type( paramsData->typemap, T_DATA );
}
}
/*
* call-seq:
* conn.exec_params(sql, params[, result_format[, type_map]] ) -> PG::Result
* conn.exec_params(sql, params[, result_format[, type_map]] ) {|pg_result| block }
*
* Sends SQL query request specified by +sql+ to PostgreSQL using placeholders
* for parameters.
*
* Returns a PG::Result instance on success. On failure, it raises a PG::Error.
*
* +params+ is an array of the bind parameters for the SQL query.
* Each element of the +params+ array may be either:
* a hash of the form:
* {:value => String (value of bind parameter)
* :type => Fixnum (oid of type of bind parameter)
* :format => Fixnum (0 for text, 1 for binary)
* }
* or, it may be a String. If it is a string, that is equivalent to the hash:
* { :value => , :type => 0, :format => 0 }
*
* PostgreSQL bind parameters are represented as $1, $1, $2, etc.,
* inside the SQL query. The 0th element of the +params+ array is bound
* to $1, the 1st element is bound to $2, etc. +nil+ is treated as +NULL+.
*
* If the types are not specified, they will be inferred by PostgreSQL.
* Instead of specifying type oids, it's recommended to simply add
* explicit casts in the query to ensure that the right type is used.
*
* For example: "SELECT $1::int"
*
* The optional +result_format+ should be 0 for text results, 1
* for binary.
*
* type_map can be a PG::TypeMap derivation (such as PG::BasicTypeMapForQueries).
* This will type cast the params form various Ruby types before transmission
* based on the encoders defined by the type map. When a type encoder is used
* the format and oid of a given bind parameter are retrieved from the encoder
* instead out of the hash form described above.
*
* If the optional code block is given, it will be passed result as an argument,
* and the PG::Result object will automatically be cleared when the block terminates.
* In this instance, conn.exec returns the value of the block.
*/
static VALUE
pgconn_exec_params( int argc, VALUE *argv, VALUE self )
{
PGconn *conn = pg_get_pgconn(self);
PGresult *result = NULL;
VALUE rb_pgresult;
VALUE command, in_res_fmt;
int nParams;
int resultFormat;
struct query_params_data paramsData;
rb_scan_args(argc, argv, "13", &command, ¶msData.params, &in_res_fmt, ¶msData.typemap);
paramsData.with_types = 1;
/*
* Handle the edge-case where the caller is coming from #exec, but passed an explict +nil+
* for the second parameter.
*/
if ( NIL_P(paramsData.params) ) {
return pgconn_exec( 1, argv, self );
}
pgconn_query_assign_typemap( self, ¶msData );
resultFormat = NIL_P(in_res_fmt) ? 0 : NUM2INT(in_res_fmt);
nParams = alloc_query_params( ¶msData );
result = gvl_PQexecParams(conn, StringValueCStr(command), nParams, paramsData.types,
(const char * const *)paramsData.values, paramsData.lengths, paramsData.formats, resultFormat);
free_query_params( ¶msData );
rb_pgresult = pg_new_result(result, self);
pg_result_check(rb_pgresult);
if (rb_block_given_p()) {
return rb_ensure(rb_yield, rb_pgresult, pg_result_clear, rb_pgresult);
}
return rb_pgresult;
}
/*
* call-seq:
* conn.prepare(stmt_name, sql [, param_types ] ) -> PG::Result
*
* Prepares statement _sql_ with name _name_ to be executed later.
* Returns a PG::Result instance on success.
* On failure, it raises a PG::Error.
*
* +param_types+ is an optional parameter to specify the Oids of the
* types of the parameters.
*
* If the types are not specified, they will be inferred by PostgreSQL.
* Instead of specifying type oids, it's recommended to simply add
* explicit casts in the query to ensure that the right type is used.
*
* For example: "SELECT $1::int"
*
* PostgreSQL bind parameters are represented as $1, $1, $2, etc.,
* inside the SQL query.
*/
static VALUE
pgconn_prepare(int argc, VALUE *argv, VALUE self)
{
PGconn *conn = pg_get_pgconn(self);
PGresult *result = NULL;
VALUE rb_pgresult;
VALUE name, command, in_paramtypes;
VALUE param;
int i = 0;
int nParams = 0;
Oid *paramTypes = NULL;
rb_scan_args(argc, argv, "21", &name, &command, &in_paramtypes);
Check_Type(name, T_STRING);
Check_Type(command, T_STRING);
if(! NIL_P(in_paramtypes)) {
Check_Type(in_paramtypes, T_ARRAY);
nParams = (int)RARRAY_LEN(in_paramtypes);
paramTypes = ALLOC_N(Oid, nParams);
for(i = 0; i < nParams; i++) {
param = rb_ary_entry(in_paramtypes, i);
if(param == Qnil)
paramTypes[i] = 0;
else
paramTypes[i] = NUM2UINT(param);
}
}
result = gvl_PQprepare(conn, StringValueCStr(name), StringValueCStr(command),
nParams, paramTypes);
xfree(paramTypes);
rb_pgresult = pg_new_result(result, self);
pg_result_check(rb_pgresult);
return rb_pgresult;
}
/*
* call-seq:
* conn.exec_prepared(statement_name [, params, result_format[, type_map]] ) -> PG::Result
* conn.exec_prepared(statement_name [, params, result_format[, type_map]] ) {|pg_result| block }
*
* Execute prepared named statement specified by _statement_name_.
* Returns a PG::Result instance on success.
* On failure, it raises a PG::Error.
*
* +params+ is an array of the optional bind parameters for the
* SQL query. Each element of the +params+ array may be either:
* a hash of the form:
* {:value => String (value of bind parameter)
* :format => Fixnum (0 for text, 1 for binary)
* }
* or, it may be a String. If it is a string, that is equivalent to the hash:
* { :value => , :format => 0 }
*
* PostgreSQL bind parameters are represented as $1, $1, $2, etc.,
* inside the SQL query. The 0th element of the +params+ array is bound
* to $1, the 1st element is bound to $2, etc. +nil+ is treated as +NULL+.
*
* The optional +result_format+ should be 0 for text results, 1
* for binary.
*
* type_map can be a PG::TypeMap derivation (such as PG::BasicTypeMapForQueries).
* This will type cast the params form various Ruby types before transmission
* based on the encoders defined by the type map. When a type encoder is used
* the format and oid of a given bind parameter are retrieved from the encoder
* instead out of the hash form described above.
*
* If the optional code block is given, it will be passed result as an argument,
* and the PG::Result object will automatically be cleared when the block terminates.
* In this instance, conn.exec_prepared returns the value of the block.
*/
static VALUE
pgconn_exec_prepared(int argc, VALUE *argv, VALUE self)
{
PGconn *conn = pg_get_pgconn(self);
PGresult *result = NULL;
VALUE rb_pgresult;
VALUE name, in_res_fmt;
int nParams;
int resultFormat;
struct query_params_data paramsData;
rb_scan_args(argc, argv, "13", &name, ¶msData.params, &in_res_fmt, ¶msData.typemap);
paramsData.with_types = 0;
Check_Type(name, T_STRING);
if(NIL_P(paramsData.params)) {
paramsData.params = rb_ary_new2(0);
}
pgconn_query_assign_typemap( self, ¶msData );
resultFormat = NIL_P(in_res_fmt) ? 0 : NUM2INT(in_res_fmt);
nParams = alloc_query_params( ¶msData );
result = gvl_PQexecPrepared(conn, StringValueCStr(name), nParams,
(const char * const *)paramsData.values, paramsData.lengths, paramsData.formats,
resultFormat);
free_query_params( ¶msData );
rb_pgresult = pg_new_result(result, self);
pg_result_check(rb_pgresult);
if (rb_block_given_p()) {
return rb_ensure(rb_yield, rb_pgresult,
pg_result_clear, rb_pgresult);
}
return rb_pgresult;
}
/*
* call-seq:
* conn.describe_prepared( statement_name ) -> PG::Result
*
* Retrieve information about the prepared statement
* _statement_name_.
*/
static VALUE
pgconn_describe_prepared(VALUE self, VALUE stmt_name)
{
PGresult *result;
VALUE rb_pgresult;
PGconn *conn = pg_get_pgconn(self);
char *stmt;
if(stmt_name == Qnil) {
stmt = NULL;
}
else {
Check_Type(stmt_name, T_STRING);
stmt = StringValueCStr(stmt_name);
}
result = gvl_PQdescribePrepared(conn, stmt);
rb_pgresult = pg_new_result(result, self);
pg_result_check(rb_pgresult);
return rb_pgresult;
}
/*
* call-seq:
* conn.describe_portal( portal_name ) -> PG::Result
*
* Retrieve information about the portal _portal_name_.
*/
static VALUE
pgconn_describe_portal(self, stmt_name)
VALUE self, stmt_name;
{
PGresult *result;
VALUE rb_pgresult;
PGconn *conn = pg_get_pgconn(self);
char *stmt;
if(stmt_name == Qnil) {
stmt = NULL;
}
else {
Check_Type(stmt_name, T_STRING);
stmt = StringValueCStr(stmt_name);
}
result = gvl_PQdescribePortal(conn, stmt);
rb_pgresult = pg_new_result(result, self);
pg_result_check(rb_pgresult);
return rb_pgresult;
}
/*
* call-seq:
* conn.make_empty_pgresult( status ) -> PG::Result
*
* Constructs and empty PG::Result with status _status_.
* _status_ may be one of:
* * +PGRES_EMPTY_QUERY+
* * +PGRES_COMMAND_OK+
* * +PGRES_TUPLES_OK+
* * +PGRES_COPY_OUT+
* * +PGRES_COPY_IN+
* * +PGRES_BAD_RESPONSE+
* * +PGRES_NONFATAL_ERROR+
* * +PGRES_FATAL_ERROR+
* * +PGRES_COPY_BOTH+
*/
static VALUE
pgconn_make_empty_pgresult(VALUE self, VALUE status)
{
PGresult *result;
VALUE rb_pgresult;
PGconn *conn = pg_get_pgconn(self);
result = PQmakeEmptyPGresult(conn, NUM2INT(status));
rb_pgresult = pg_new_result(result, self);
pg_result_check(rb_pgresult);
return rb_pgresult;
}
/*
* call-seq:
* conn.escape_string( str ) -> String
*
* Connection instance method for versions of 8.1 and higher of libpq
* uses PQescapeStringConn, which is safer. Avoid calling as a class method,
* the class method uses the deprecated PQescapeString() API function.
*
* Returns a SQL-safe version of the String _str_.
* This is the preferred way to make strings safe for inclusion in
* SQL queries.
*
* Consider using exec_params, which avoids the need for passing values
* inside of SQL commands.
*
* Encoding of escaped string will be equal to client encoding of connection.
*/
static VALUE
pgconn_s_escape(VALUE self, VALUE string)
{
char *escaped;
size_t size;
int error;
VALUE result;
Check_Type(string, T_STRING);
escaped = ALLOC_N(char, RSTRING_LEN(string) * 2 + 1);
if(rb_obj_class(self) == rb_cPGconn) {
size = PQescapeStringConn(pg_get_pgconn(self), escaped,
RSTRING_PTR(string), RSTRING_LEN(string), &error);
if(error) {
xfree(escaped);
rb_raise(rb_ePGerror, "%s", PQerrorMessage(pg_get_pgconn(self)));
}
} else {
size = PQescapeString(escaped, RSTRING_PTR(string), RSTRING_LENINT(string));
}
result = rb_str_new(escaped, size);
xfree(escaped);
OBJ_INFECT(result, string);
PG_ENCODING_SET_NOCHECK(result, ENCODING_GET( rb_obj_class(self) == rb_cPGconn ? self : string ));
return result;
}
/*
* call-seq:
* conn.escape_bytea( string ) -> String
*
* Connection instance method for versions of 8.1 and higher of libpq
* uses PQescapeByteaConn, which is safer. Avoid calling as a class method,
* the class method uses the deprecated PQescapeBytea() API function.
*
* Use the instance method version of this function, it is safer than the
* class method.
*
* Escapes binary data for use within an SQL command with the type +bytea+.
*
* Certain byte values must be escaped (but all byte values may be escaped)
* when used as part of a +bytea+ literal in an SQL statement. In general, to
* escape a byte, it is converted into the three digit octal number equal to
* the octet value, and preceded by two backslashes. The single quote (') and
* backslash (\) characters have special alternative escape sequences.
* #escape_bytea performs this operation, escaping only the minimally required
* bytes.
*
* Consider using exec_params, which avoids the need for passing values inside of
* SQL commands.
*/
static VALUE
pgconn_s_escape_bytea(VALUE self, VALUE str)
{
unsigned char *from, *to;
size_t from_len, to_len;
VALUE ret;
Check_Type(str, T_STRING);
from = (unsigned char*)RSTRING_PTR(str);
from_len = RSTRING_LEN(str);
if(rb_obj_class(self) == rb_cPGconn) {
to = PQescapeByteaConn(pg_get_pgconn(self), from, from_len, &to_len);
} else {
to = PQescapeBytea( from, from_len, &to_len);
}
ret = rb_str_new((char*)to, to_len - 1);
OBJ_INFECT(ret, str);
PQfreemem(to);
return ret;
}
/*
* call-seq:
* PG::Connection.unescape_bytea( string )
*
* Converts an escaped string representation of binary data into binary data --- the
* reverse of #escape_bytea. This is needed when retrieving +bytea+ data in text format,
* but not when retrieving it in binary format.
*
*/
static VALUE
pgconn_s_unescape_bytea(VALUE self, VALUE str)
{
unsigned char *from, *to;
size_t to_len;
VALUE ret;
UNUSED( self );
Check_Type(str, T_STRING);
from = (unsigned char*)StringValueCStr(str);
to = PQunescapeBytea(from, &to_len);
ret = rb_str_new((char*)to, to_len);
OBJ_INFECT(ret, str);
PQfreemem(to);
return ret;
}
#ifdef HAVE_PQESCAPELITERAL
/*
* call-seq:
* conn.escape_literal( str ) -> String
*
* Escape an arbitrary String +str+ as a literal.
*/
static VALUE
pgconn_escape_literal(VALUE self, VALUE string)
{
PGconn *conn = pg_get_pgconn(self);
char *escaped = NULL;
VALUE error;
VALUE result = Qnil;
Check_Type(string, T_STRING);
escaped = PQescapeLiteral(conn, RSTRING_PTR(string), RSTRING_LEN(string));
if (escaped == NULL)
{
error = rb_exc_new2(rb_ePGerror, PQerrorMessage(conn));
rb_iv_set(error, "@connection", self);
rb_exc_raise(error);
return Qnil;
}
result = rb_str_new2(escaped);
PQfreemem(escaped);
OBJ_INFECT(result, string);
PG_ENCODING_SET_NOCHECK(result, ENCODING_GET(self));
return result;
}
#endif
#ifdef HAVE_PQESCAPEIDENTIFIER
/*
* call-seq:
* conn.escape_identifier( str ) -> String
*
* Escape an arbitrary String +str+ as an identifier.
*
* This method does the same as #quote_ident, but uses libpq to
* process the string.
*/
static VALUE
pgconn_escape_identifier(VALUE self, VALUE string)
{
PGconn *conn = pg_get_pgconn(self);
char *escaped = NULL;
VALUE error;
VALUE result = Qnil;
Check_Type(string, T_STRING);
escaped = PQescapeIdentifier(conn, RSTRING_PTR(string), RSTRING_LEN(string));
if (escaped == NULL)
{
error = rb_exc_new2(rb_ePGerror, PQerrorMessage(conn));
rb_iv_set(error, "@connection", self);
rb_exc_raise(error);
return Qnil;
}
result = rb_str_new2(escaped);
PQfreemem(escaped);
OBJ_INFECT(result, string);
PG_ENCODING_SET_NOCHECK(result, ENCODING_GET(self));
return result;
}
#endif
#ifdef HAVE_PQSETSINGLEROWMODE
/*
* call-seq:
* conn.set_single_row_mode -> self
*
* To enter single-row mode, call this method immediately after a successful
* call of send_query (or a sibling function). This mode selection is effective
* only for the currently executing query.
* Then call Connection#get_result repeatedly, until it returns nil.
*
* Each (but the last) received Result has exactly one row and a
* Result#result_status of PGRES_SINGLE_TUPLE. The last Result has
* zero rows and is used to indicate a successful execution of the query.
* All of these Result objects will contain the same row description data
* (column names, types, etc) that an ordinary Result object for the query
* would have.
*
* *Caution:* While processing a query, the server may return some rows and
* then encounter an error, causing the query to be aborted. Ordinarily, pg
* discards any such rows and reports only the error. But in single-row mode,
* those rows will have already been returned to the application. Hence, the
* application will see some Result objects followed by an Error raised in get_result.
* For proper transactional behavior, the application must be designed to discard
* or undo whatever has been done with the previously-processed rows, if the query
* ultimately fails.
*
* Example:
* conn.send_query( "your SQL command" )
* conn.set_single_row_mode
* loop do
* res = conn.get_result or break
* res.check
* res.each do |row|
* # do something with the received row
* end
* end
*
*/
static VALUE
pgconn_set_single_row_mode(VALUE self)
{
PGconn *conn = pg_get_pgconn(self);
VALUE error;
if( PQsetSingleRowMode(conn) == 0 )
{
error = rb_exc_new2(rb_ePGerror, PQerrorMessage(conn));
rb_iv_set(error, "@connection", self);
rb_exc_raise(error);
}
return self;
}
#endif
/*
* call-seq:
* conn.send_query(sql [, params, result_format[, type_map ]] ) -> nil
*
* Sends SQL query request specified by _sql_ to PostgreSQL for
* asynchronous processing, and immediately returns.
* On failure, it raises a PG::Error.
*
* +params+ is an optional array of the bind parameters for the SQL query.
* Each element of the +params+ array may be either:
* a hash of the form:
* {:value => String (value of bind parameter)
* :type => Fixnum (oid of type of bind parameter)
* :format => Fixnum (0 for text, 1 for binary)
* }
* or, it may be a String. If it is a string, that is equivalent to the hash:
* { :value => , :type => 0, :format => 0 }
*
* PostgreSQL bind parameters are represented as $1, $1, $2, etc.,
* inside the SQL query. The 0th element of the +params+ array is bound
* to $1, the 1st element is bound to $2, etc. +nil+ is treated as +NULL+.
*
* If the types are not specified, they will be inferred by PostgreSQL.
* Instead of specifying type oids, it's recommended to simply add
* explicit casts in the query to ensure that the right type is used.
*
* For example: "SELECT $1::int"
*
* The optional +result_format+ should be 0 for text results, 1
* for binary.
*
* type_map can be a PG::TypeMap derivation (such as PG::BasicTypeMapForQueries).
* This will type cast the params form various Ruby types before transmission
* based on the encoders defined by the type map. When a type encoder is used
* the format and oid of a given bind parameter are retrieved from the encoder
* instead out of the hash form described above.
*
*/
static VALUE
pgconn_send_query(int argc, VALUE *argv, VALUE self)
{
PGconn *conn = pg_get_pgconn(self);
int result;
VALUE command, in_res_fmt;
VALUE error;
int nParams;
int resultFormat;
struct query_params_data paramsData;
rb_scan_args(argc, argv, "13", &command, ¶msData.params, &in_res_fmt, ¶msData.typemap);
paramsData.with_types = 1;
Check_Type(command, T_STRING);
/* If called with no parameters, use PQsendQuery */
if(NIL_P(paramsData.params)) {
if(gvl_PQsendQuery(conn,StringValueCStr(command)) == 0) {
error = rb_exc_new2(rb_eUnableToSend, PQerrorMessage(conn));
rb_iv_set(error, "@connection", self);
rb_exc_raise(error);
}
return Qnil;
}
/* If called with parameters, and optionally result_format,
* use PQsendQueryParams
*/
pgconn_query_assign_typemap( self, ¶msData );
resultFormat = NIL_P(in_res_fmt) ? 0 : NUM2INT(in_res_fmt);
nParams = alloc_query_params( ¶msData );
result = gvl_PQsendQueryParams(conn, StringValueCStr(command), nParams, paramsData.types,
(const char * const *)paramsData.values, paramsData.lengths, paramsData.formats, resultFormat);
free_query_params( ¶msData );
if(result == 0) {
error = rb_exc_new2(rb_eUnableToSend, PQerrorMessage(conn));
rb_iv_set(error, "@connection", self);
rb_exc_raise(error);
}
return Qnil;
}
/*
* call-seq:
* conn.send_prepare( stmt_name, sql [, param_types ] ) -> nil
*
* Prepares statement _sql_ with name _name_ to be executed later.
* Sends prepare command asynchronously, and returns immediately.
* On failure, it raises a PG::Error.
*
* +param_types+ is an optional parameter to specify the Oids of the
* types of the parameters.
*
* If the types are not specified, they will be inferred by PostgreSQL.
* Instead of specifying type oids, it's recommended to simply add
* explicit casts in the query to ensure that the right type is used.
*
* For example: "SELECT $1::int"
*
* PostgreSQL bind parameters are represented as $1, $1, $2, etc.,
* inside the SQL query.
*/
static VALUE
pgconn_send_prepare(int argc, VALUE *argv, VALUE self)
{
PGconn *conn = pg_get_pgconn(self);
int result;
VALUE name, command, in_paramtypes;
VALUE param;
VALUE error;
int i = 0;
int nParams = 0;
Oid *paramTypes = NULL;
rb_scan_args(argc, argv, "21", &name, &command, &in_paramtypes);
Check_Type(name, T_STRING);
Check_Type(command, T_STRING);
if(! NIL_P(in_paramtypes)) {
Check_Type(in_paramtypes, T_ARRAY);
nParams = (int)RARRAY_LEN(in_paramtypes);
paramTypes = ALLOC_N(Oid, nParams);
for(i = 0; i < nParams; i++) {
param = rb_ary_entry(in_paramtypes, i);
if(param == Qnil)
paramTypes[i] = 0;
else
paramTypes[i] = NUM2UINT(param);
}
}
result = gvl_PQsendPrepare(conn, StringValueCStr(name), StringValueCStr(command),
nParams, paramTypes);
xfree(paramTypes);
if(result == 0) {
error = rb_exc_new2(rb_eUnableToSend, PQerrorMessage(conn));
rb_iv_set(error, "@connection", self);
rb_exc_raise(error);
}
return Qnil;
}
/*
* call-seq:
* conn.send_query_prepared( statement_name [, params, result_format[, type_map ]] )
* -> nil
*
* Execute prepared named statement specified by _statement_name_
* asynchronously, and returns immediately.
* On failure, it raises a PG::Error.
*
* +params+ is an array of the optional bind parameters for the
* SQL query. Each element of the +params+ array may be either:
* a hash of the form:
* {:value => String (value of bind parameter)
* :format => Fixnum (0 for text, 1 for binary)
* }
* or, it may be a String. If it is a string, that is equivalent to the hash:
* { :value => , :format => 0 }
*
* PostgreSQL bind parameters are represented as $1, $1, $2, etc.,
* inside the SQL query. The 0th element of the +params+ array is bound
* to $1, the 1st element is bound to $2, etc. +nil+ is treated as +NULL+.
*
* The optional +result_format+ should be 0 for text results, 1
* for binary.
*
* type_map can be a PG::TypeMap derivation (such as PG::BasicTypeMapForQueries).
* This will type cast the params form various Ruby types before transmission
* based on the encoders defined by the type map. When a type encoder is used
* the format and oid of a given bind parameter are retrieved from the encoder
* instead out of the hash form described above.
*
*/
static VALUE
pgconn_send_query_prepared(int argc, VALUE *argv, VALUE self)
{
PGconn *conn = pg_get_pgconn(self);
int result;
VALUE name, in_res_fmt;
VALUE error;
int nParams;
int resultFormat;
struct query_params_data paramsData;
rb_scan_args(argc, argv, "13", &name, ¶msData.params, &in_res_fmt, ¶msData.typemap);
paramsData.with_types = 0;
Check_Type(name, T_STRING);
if(NIL_P(paramsData.params)) {
paramsData.params = rb_ary_new2(0);
resultFormat = 0;
}
pgconn_query_assign_typemap( self, ¶msData );
resultFormat = NIL_P(in_res_fmt) ? 0 : NUM2INT(in_res_fmt);
nParams = alloc_query_params( ¶msData );
result = gvl_PQsendQueryPrepared(conn, StringValueCStr(name), nParams,
(const char * const *)paramsData.values, paramsData.lengths, paramsData.formats,
resultFormat);
free_query_params( ¶msData );
if(result == 0) {
error = rb_exc_new2(rb_eUnableToSend, PQerrorMessage(conn));
rb_iv_set(error, "@connection", self);
rb_exc_raise(error);
}
return Qnil;
}
/*
* call-seq:
* conn.send_describe_prepared( statement_name ) -> nil
*
* Asynchronously send _command_ to the server. Does not block.
* Use in combination with +conn.get_result+.
*/
static VALUE
pgconn_send_describe_prepared(VALUE self, VALUE stmt_name)
{
VALUE error;
PGconn *conn = pg_get_pgconn(self);
/* returns 0 on failure */
if(gvl_PQsendDescribePrepared(conn,StringValueCStr(stmt_name)) == 0) {
error = rb_exc_new2(rb_eUnableToSend, PQerrorMessage(conn));
rb_iv_set(error, "@connection", self);
rb_exc_raise(error);
}
return Qnil;
}
/*
* call-seq:
* conn.send_describe_portal( portal_name ) -> nil
*
* Asynchronously send _command_ to the server. Does not block.
* Use in combination with +conn.get_result+.
*/
static VALUE
pgconn_send_describe_portal(VALUE self, VALUE portal)
{
VALUE error;
PGconn *conn = pg_get_pgconn(self);
/* returns 0 on failure */
if(gvl_PQsendDescribePortal(conn,StringValueCStr(portal)) == 0) {
error = rb_exc_new2(rb_eUnableToSend, PQerrorMessage(conn));
rb_iv_set(error, "@connection", self);
rb_exc_raise(error);
}
return Qnil;
}
/*
* call-seq:
* conn.get_result() -> PG::Result
* conn.get_result() {|pg_result| block }
*
* Blocks waiting for the next result from a call to
* #send_query (or another asynchronous command), and returns
* it. Returns +nil+ if no more results are available.
*
* Note: call this function repeatedly until it returns +nil+, or else
* you will not be able to issue further commands.
*
* If the optional code block is given, it will be passed result as an argument,
* and the PG::Result object will automatically be cleared when the block terminates.
* In this instance, conn.exec returns the value of the block.
*/
static VALUE
pgconn_get_result(VALUE self)
{
PGconn *conn = pg_get_pgconn(self);
PGresult *result;
VALUE rb_pgresult;
result = gvl_PQgetResult(conn);
if(result == NULL)
return Qnil;
rb_pgresult = pg_new_result(result, self);
if (rb_block_given_p()) {
return rb_ensure(rb_yield, rb_pgresult,
pg_result_clear, rb_pgresult);
}
return rb_pgresult;
}
/*
* call-seq:
* conn.consume_input()
*
* If input is available from the server, consume it.
* After calling +consume_input+, you can check +is_busy+
* or *notifies* to see if the state has changed.
*/
static VALUE
pgconn_consume_input(self)
VALUE self;
{
VALUE error;
PGconn *conn = pg_get_pgconn(self);
/* returns 0 on error */
if(PQconsumeInput(conn) == 0) {
error = rb_exc_new2(rb_eConnectionBad, PQerrorMessage(conn));
rb_iv_set(error, "@connection", self);
rb_exc_raise(error);
}
return Qnil;
}
/*
* call-seq:
* conn.is_busy() -> Boolean
*
* Returns +true+ if a command is busy, that is, if
* PQgetResult would block. Otherwise returns +false+.
*/
static VALUE
pgconn_is_busy(self)
VALUE self;
{
return gvl_PQisBusy(pg_get_pgconn(self)) ? Qtrue : Qfalse;
}
/*
* call-seq:
* conn.setnonblocking(Boolean) -> nil
*
* Sets the nonblocking status of the connection.
* In the blocking state, calls to #send_query
* will block until the message is sent to the server,
* but will not wait for the query results.
* In the nonblocking state, calls to #send_query
* will return an error if the socket is not ready for
* writing.
* Note: This function does not affect #exec, because
* that function doesn't return until the server has
* processed the query and returned the results.
* Returns +nil+.
*/
static VALUE
pgconn_setnonblocking(self, state)
VALUE self, state;
{
int arg;
VALUE error;
PGconn *conn = pg_get_pgconn(self);
if(state == Qtrue)
arg = 1;
else if (state == Qfalse)
arg = 0;
else
rb_raise(rb_eArgError, "Boolean value expected");
if(PQsetnonblocking(conn, arg) == -1) {
error = rb_exc_new2(rb_ePGerror, PQerrorMessage(conn));
rb_iv_set(error, "@connection", self);
rb_exc_raise(error);
}
return Qnil;
}
/*
* call-seq:
* conn.isnonblocking() -> Boolean
*
* Returns +true+ if a command is busy, that is, if
* PQgetResult would block. Otherwise returns +false+.
*/
static VALUE
pgconn_isnonblocking(self)
VALUE self;
{
return PQisnonblocking(pg_get_pgconn(self)) ? Qtrue : Qfalse;
}
/*
* call-seq:
* conn.flush() -> Boolean
*
* Attempts to flush any queued output data to the server.
* Returns +true+ if data is successfully flushed, +false+
* if not (can only return +false+ if connection is
* nonblocking.
* Raises PG::Error if some other failure occurred.
*/
static VALUE
pgconn_flush(self)
VALUE self;
{
PGconn *conn = pg_get_pgconn(self);
int ret;
VALUE error;
ret = PQflush(conn);
if(ret == -1) {
error = rb_exc_new2(rb_ePGerror, PQerrorMessage(conn));
rb_iv_set(error, "@connection", self);
rb_exc_raise(error);
}
return (ret) ? Qfalse : Qtrue;
}
/*
* call-seq:
* conn.cancel() -> String
*
* Requests cancellation of the command currently being
* processed. (Only implemented in PostgreSQL >= 8.0)
*
* Returns +nil+ on success, or a string containing the
* error message if a failure occurs.
*/
static VALUE
pgconn_cancel(VALUE self)
{
#ifdef HAVE_PQGETCANCEL
char errbuf[256];
PGcancel *cancel;
VALUE retval;
int ret;
cancel = PQgetCancel(pg_get_pgconn(self));
if(cancel == NULL)
rb_raise(rb_ePGerror,"Invalid connection!");
ret = gvl_PQcancel(cancel, errbuf, 256);
if(ret == 1)
retval = Qnil;
else
retval = rb_str_new2(errbuf);
PQfreeCancel(cancel);
return retval;
#else
rb_notimplement();
#endif
}
/*
* call-seq:
* conn.notifies()
*
* Returns a hash of the unprocessed notifications.
* If there is no unprocessed notifier, it returns +nil+.
*/
static VALUE
pgconn_notifies(VALUE self)
{
PGconn* conn = pg_get_pgconn(self);
PGnotify *notification;
VALUE hash;
VALUE sym_relname, sym_be_pid, sym_extra;
VALUE relname, be_pid, extra;
sym_relname = ID2SYM(rb_intern("relname"));
sym_be_pid = ID2SYM(rb_intern("be_pid"));
sym_extra = ID2SYM(rb_intern("extra"));
notification = gvl_PQnotifies(conn);
if (notification == NULL) {
return Qnil;
}
hash = rb_hash_new();
relname = rb_tainted_str_new2(notification->relname);
be_pid = INT2NUM(notification->be_pid);
extra = rb_tainted_str_new2(notification->extra);
PG_ENCODING_SET_NOCHECK( relname, ENCODING_GET(self) );
PG_ENCODING_SET_NOCHECK( extra, ENCODING_GET(self) );
rb_hash_aset(hash, sym_relname, relname);
rb_hash_aset(hash, sym_be_pid, be_pid);
rb_hash_aset(hash, sym_extra, extra);
PQfreemem(notification);
return hash;
}
/* Win32 + Ruby 1.8 */
#if !defined( HAVE_RUBY_VM_H ) && defined( _WIN32 )
/*
* Duplicate the sockets from libpq and create temporary CRT FDs
*/
void create_crt_fd(fd_set *os_set, fd_set *crt_set)
{
int i;
crt_set->fd_count = os_set->fd_count;
for (i = 0; i < os_set->fd_count; i++) {
WSAPROTOCOL_INFO wsa_pi;
/* dupicate the SOCKET */
int r = WSADuplicateSocket(os_set->fd_array[i], GetCurrentProcessId(), &wsa_pi);
SOCKET s = WSASocket(wsa_pi.iAddressFamily, wsa_pi.iSocketType, wsa_pi.iProtocol, &wsa_pi, 0, 0);
/* create the CRT fd so ruby can get back to the SOCKET */
int fd = _open_osfhandle(s, O_RDWR|O_BINARY);
os_set->fd_array[i] = s;
crt_set->fd_array[i] = fd;
}
}
/*
* Clean up the CRT FDs from create_crt_fd()
*/
void cleanup_crt_fd(fd_set *os_set, fd_set *crt_set)
{
int i;
for (i = 0; i < os_set->fd_count; i++) {
/* cleanup the CRT fd */
_close(crt_set->fd_array[i]);
/* cleanup the duplicated SOCKET */
closesocket(os_set->fd_array[i]);
}
}
#endif
/* Win32 + Ruby 1.9+ */
#if defined( HAVE_RUBY_VM_H ) && defined( _WIN32 )
/*
* On Windows, use platform-specific strategies to wait for the socket
* instead of rb_thread_select().
*/
int rb_w32_wait_events( HANDLE *events, int num, DWORD timeout );
/* If WIN32 and Ruby 1.9 do not use rb_thread_select() which sometimes hangs
* and does not wait (nor sleep) any time even if timeout is given.
* Instead use the Winsock events and rb_w32_wait_events(). */
static void *
wait_socket_readable( PGconn *conn, struct timeval *ptimeout, void *(*is_readable)(PGconn *) )
{
int sd = PQsocket( conn );
void *retval;
struct timeval aborttime={0,0}, currtime, waittime;
DWORD timeout_milisec = INFINITE;
DWORD wait_ret;
WSAEVENT hEvent;
if ( sd < 0 )
rb_raise(rb_eConnectionBad, "PQsocket() can't get socket descriptor");
hEvent = WSACreateEvent();
/* Check for connection errors (PQisBusy is true on connection errors) */
if( PQconsumeInput(conn) == 0 ) {
WSACloseEvent( hEvent );
rb_raise( rb_eConnectionBad, "PQconsumeInput() %s", PQerrorMessage(conn) );
}
if ( ptimeout ) {
gettimeofday(&currtime, NULL);
timeradd(&currtime, ptimeout, &aborttime);
}
while ( !(retval=is_readable(conn)) ) {
if ( WSAEventSelect(sd, hEvent, FD_READ|FD_CLOSE) == SOCKET_ERROR ) {
WSACloseEvent( hEvent );
rb_raise( rb_eConnectionBad, "WSAEventSelect socket error: %d", WSAGetLastError() );
}
if ( ptimeout ) {
gettimeofday(&currtime, NULL);
timersub(&aborttime, &currtime, &waittime);
timeout_milisec = (DWORD)( waittime.tv_sec * 1e3 + waittime.tv_usec / 1e3 );
}
/* Is the given timeout valid? */
if( !ptimeout || (waittime.tv_sec >= 0 && waittime.tv_usec >= 0) ){
/* Wait for the socket to become readable before checking again */
wait_ret = rb_w32_wait_events( &hEvent, 1, timeout_milisec );
} else {
wait_ret = WAIT_TIMEOUT;
}
if ( wait_ret == WAIT_TIMEOUT ) {
WSACloseEvent( hEvent );
return NULL;
} else if ( wait_ret == WAIT_OBJECT_0 ) {
/* The event we were waiting for. */
} else if ( wait_ret == WAIT_OBJECT_0 + 1) {
/* This indicates interruption from timer thread, GC, exception
* from other threads etc... */
rb_thread_check_ints();
} else if ( wait_ret == WAIT_FAILED ) {
WSACloseEvent( hEvent );
rb_raise( rb_eConnectionBad, "Wait on socket error (WaitForMultipleObjects): %lu", GetLastError() );
} else {
WSACloseEvent( hEvent );
rb_raise( rb_eConnectionBad, "Wait on socket abandoned (WaitForMultipleObjects)" );
}
/* Check for connection errors (PQisBusy is true on connection errors) */
if ( PQconsumeInput(conn) == 0 ) {
WSACloseEvent( hEvent );
rb_raise( rb_eConnectionBad, "PQconsumeInput() %s", PQerrorMessage(conn) );
}
}
WSACloseEvent( hEvent );
return retval;
}
#else
/* non Win32 or Win32+Ruby-1.8 */
static void *
wait_socket_readable( PGconn *conn, struct timeval *ptimeout, void *(*is_readable)(PGconn *))
{
int sd = PQsocket( conn );
int ret;
void *retval;
rb_fdset_t sd_rset;
struct timeval aborttime={0,0}, currtime, waittime;
#ifdef _WIN32
rb_fdset_t crt_sd_rset;
#endif
if ( sd < 0 )
rb_raise(rb_eConnectionBad, "PQsocket() can't get socket descriptor");
/* Check for connection errors (PQisBusy is true on connection errors) */
if ( PQconsumeInput(conn) == 0 )
rb_raise( rb_eConnectionBad, "PQconsumeInput() %s", PQerrorMessage(conn) );
rb_fd_init( &sd_rset );
if ( ptimeout ) {
gettimeofday(&currtime, NULL);
timeradd(&currtime, ptimeout, &aborttime);
}
while ( !(retval=is_readable(conn)) ) {
rb_fd_zero( &sd_rset );
rb_fd_set( sd, &sd_rset );
#ifdef _WIN32
/* Ruby's FD_SET is modified on win32 to convert a file descriptor
* to osfhandle, but we already get a osfhandle from PQsocket().
* Therefore it's overwritten here. */
sd_rset.fd_array[0] = sd;
create_crt_fd(&sd_rset, &crt_sd_rset);
#endif
if ( ptimeout ) {
gettimeofday(&currtime, NULL);
timersub(&aborttime, &currtime, &waittime);
}
/* Is the given timeout valid? */
if( !ptimeout || (waittime.tv_sec >= 0 && waittime.tv_usec >= 0) ){
/* Wait for the socket to become readable before checking again */
ret = rb_thread_fd_select( sd+1, &sd_rset, NULL, NULL, ptimeout ? &waittime : NULL );
} else {
ret = 0;
}
#ifdef _WIN32
cleanup_crt_fd(&sd_rset, &crt_sd_rset);
#endif
if ( ret < 0 ){
rb_fd_term( &sd_rset );
rb_sys_fail( "rb_thread_select()" );
}
/* Return false if the select() timed out */
if ( ret == 0 ){
rb_fd_term( &sd_rset );
return NULL;
}
/* Check for connection errors (PQisBusy is true on connection errors) */
if ( PQconsumeInput(conn) == 0 ){
rb_fd_term( &sd_rset );
rb_raise( rb_eConnectionBad, "PQconsumeInput() %s", PQerrorMessage(conn) );
}
}
rb_fd_term( &sd_rset );
return retval;
}
#endif
static void *
notify_readable(PGconn *conn)
{
return (void*)gvl_PQnotifies(conn);
}
/*
* call-seq:
* conn.wait_for_notify( [ timeout ] ) -> String
* conn.wait_for_notify( [ timeout ] ) { |event, pid| block }
* conn.wait_for_notify( [ timeout ] ) { |event, pid, payload| block } # PostgreSQL 9.0
*
* Blocks while waiting for notification(s), or until the optional
* _timeout_ is reached, whichever comes first. _timeout_ is
* measured in seconds and can be fractional.
*
* Returns +nil+ if _timeout_ is reached, the name of the NOTIFY
* event otherwise. If used in block form, passes the name of the
* NOTIFY +event+ and the generating +pid+ into the block.
*
* Under PostgreSQL 9.0 and later, if the notification is sent with
* the optional +payload+ string, it will be given to the block as the
* third argument.
*
*/
static VALUE
pgconn_wait_for_notify(int argc, VALUE *argv, VALUE self)
{
PGconn *conn = pg_get_pgconn( self );
PGnotify *pnotification;
struct timeval timeout;
struct timeval *ptimeout = NULL;
VALUE timeout_in = Qnil, relname = Qnil, be_pid = Qnil, extra = Qnil;
double timeout_sec;
rb_scan_args( argc, argv, "01", &timeout_in );
if ( RTEST(timeout_in) ) {
timeout_sec = NUM2DBL( timeout_in );
timeout.tv_sec = (time_t)timeout_sec;
timeout.tv_usec = (suseconds_t)( (timeout_sec - (long)timeout_sec) * 1e6 );
ptimeout = &timeout;
}
pnotification = (PGnotify*) wait_socket_readable( conn, ptimeout, notify_readable);
/* Return nil if the select timed out */
if ( !pnotification ) return Qnil;
relname = rb_tainted_str_new2( pnotification->relname );
PG_ENCODING_SET_NOCHECK( relname, ENCODING_GET(self) );
be_pid = INT2NUM( pnotification->be_pid );
#ifdef HAVE_ST_NOTIFY_EXTRA
if ( *pnotification->extra ) {
extra = rb_tainted_str_new2( pnotification->extra );
PG_ENCODING_SET_NOCHECK( extra, ENCODING_GET(self) );
}
#endif
PQfreemem( pnotification );
if ( rb_block_given_p() )
rb_yield_values( 3, relname, be_pid, extra );
return relname;
}
/*
* call-seq:
* conn.put_copy_data( buffer [, encoder] ) -> Boolean
*
* Transmits _buffer_ as copy data to the server.
* Returns true if the data was sent, false if it was
* not sent (false is only possible if the connection
* is in nonblocking mode, and this command would block).
*
* encoder can be a PG::Coder derivation (typically PG::TextEncoder::CopyRow).
* This encodes the received data fields from an Array of Strings. Optionally
* the encoder can type cast the fields form various Ruby types in one step,
* if PG::TextEncoder::CopyRow#type_map is set accordingly.
*
* Raises an exception if an error occurs.
*
* See also #copy_data.
*
*/
static VALUE
pgconn_put_copy_data(int argc, VALUE *argv, VALUE self)
{
int ret;
int len;
t_pg_connection *this = pg_get_connection_safe( self );
VALUE value;
VALUE buffer = Qnil;
VALUE encoder;
VALUE intermediate;
t_pg_coder *p_coder = NULL;
rb_scan_args( argc, argv, "11", &value, &encoder );
if( NIL_P(encoder) ){
if( NIL_P(this->encoder_for_put_copy_data) ){
buffer = value;
} else {
p_coder = DATA_PTR( this->encoder_for_put_copy_data );
}
} else if( rb_obj_is_kind_of(encoder, rb_cPG_Coder) ) {
Data_Get_Struct( encoder, t_pg_coder, p_coder );
} else {
rb_raise( rb_eTypeError, "wrong encoder type %s (expected some kind of PG::Coder)",
rb_obj_classname( encoder ) );
}
if( p_coder ){
t_pg_coder_enc_func enc_func;
enc_func = pg_coder_enc_func( p_coder );
len = enc_func( p_coder, value, NULL, &intermediate );
if( len == -1 ){
/* The intermediate value is a String that can be used directly. */
buffer = intermediate;
} else {
buffer = rb_str_new(NULL, len);
len = enc_func( p_coder, value, RSTRING_PTR(buffer), &intermediate);
rb_str_set_len( buffer, len );
}
}
Check_Type(buffer, T_STRING);
ret = gvl_PQputCopyData(this->pgconn, RSTRING_PTR(buffer), RSTRING_LENINT(buffer));
if(ret == -1) {
VALUE error = rb_exc_new2(rb_ePGerror, PQerrorMessage(this->pgconn));
rb_iv_set(error, "@connection", self);
rb_exc_raise(error);
}
RB_GC_GUARD(intermediate);
RB_GC_GUARD(buffer);
return (ret) ? Qtrue : Qfalse;
}
/*
* call-seq:
* conn.put_copy_end( [ error_message ] ) -> Boolean
*
* Sends end-of-data indication to the server.
*
* _error_message_ is an optional parameter, and if set,
* forces the COPY command to fail with the string
* _error_message_.
*
* Returns true if the end-of-data was sent, false if it was
* not sent (false is only possible if the connection
* is in nonblocking mode, and this command would block).
*/
static VALUE
pgconn_put_copy_end(int argc, VALUE *argv, VALUE self)
{
VALUE str;
VALUE error;
int ret;
char *error_message = NULL;
PGconn *conn = pg_get_pgconn(self);
if (rb_scan_args(argc, argv, "01", &str) == 0)
error_message = NULL;
else
error_message = StringValueCStr(str);
ret = gvl_PQputCopyEnd(conn, error_message);
if(ret == -1) {
error = rb_exc_new2(rb_ePGerror, PQerrorMessage(conn));
rb_iv_set(error, "@connection", self);
rb_exc_raise(error);
}
return (ret) ? Qtrue : Qfalse;
}
/*
* call-seq:
* conn.get_copy_data( [ async = false [, decoder = nil ]] ) -> String
*
* Return a string containing one row of data, +nil+
* if the copy is done, or +false+ if the call would
* block (only possible if _async_ is true).
*
* decoder can be a PG::Coder derivation (typically PG::TextDecoder::CopyRow).
* This decodes the received data fields as Array of Strings. Optionally
* the decoder can type cast the fields to various Ruby types in one step,
* if PG::TextDecoder::CopyRow#type_map is set accordingly.
*
* See also #copy_data.
*
*/
static VALUE
pgconn_get_copy_data(int argc, VALUE *argv, VALUE self )
{
VALUE async_in;
VALUE error;
VALUE result;
int ret;
char *buffer;
VALUE decoder;
t_pg_coder *p_coder = NULL;
t_pg_connection *this = pg_get_connection_safe( self );
rb_scan_args(argc, argv, "02", &async_in, &decoder);
if( NIL_P(decoder) ){
if( !NIL_P(this->decoder_for_get_copy_data) ){
p_coder = DATA_PTR( this->decoder_for_get_copy_data );
}
} else if( rb_obj_is_kind_of(decoder, rb_cPG_Coder) ) {
Data_Get_Struct( decoder, t_pg_coder, p_coder );
} else {
rb_raise( rb_eTypeError, "wrong decoder type %s (expected some kind of PG::Coder)",
rb_obj_classname( decoder ) );
}
ret = gvl_PQgetCopyData(this->pgconn, &buffer, RTEST(async_in));
if(ret == -2) { /* error */
error = rb_exc_new2(rb_ePGerror, PQerrorMessage(this->pgconn));
rb_iv_set(error, "@connection", self);
rb_exc_raise(error);
}
if(ret == -1) { /* No data left */
return Qnil;
}
if(ret == 0) { /* would block */
return Qfalse;
}
if( p_coder ){
t_pg_coder_dec_func dec_func = pg_coder_dec_func( p_coder, p_coder->format );
result = dec_func( p_coder, buffer, ret, 0, 0, ENCODING_GET(self) );
} else {
result = rb_tainted_str_new(buffer, ret);
}
PQfreemem(buffer);
return result;
}
/*
* call-seq:
* conn.set_error_verbosity( verbosity ) -> Fixnum
*
* Sets connection's verbosity to _verbosity_ and returns
* the previous setting. Available settings are:
* * PQERRORS_TERSE
* * PQERRORS_DEFAULT
* * PQERRORS_VERBOSE
*/
static VALUE
pgconn_set_error_verbosity(VALUE self, VALUE in_verbosity)
{
PGconn *conn = pg_get_pgconn(self);
PGVerbosity verbosity = NUM2INT(in_verbosity);
return INT2FIX(PQsetErrorVerbosity(conn, verbosity));
}
/*
* call-seq:
* conn.trace( stream ) -> nil
*
* Enables tracing message passing between backend. The
* trace message will be written to the stream _stream_,
* which must implement a method +fileno+ that returns
* a writable file descriptor.
*/
static VALUE
pgconn_trace(VALUE self, VALUE stream)
{
VALUE fileno;
FILE *new_fp;
int old_fd, new_fd;
VALUE new_file;
t_pg_connection *this = pg_get_connection_safe( self );
if(rb_respond_to(stream,rb_intern("fileno")) == Qfalse)
rb_raise(rb_eArgError, "stream does not respond to method: fileno");
fileno = rb_funcall(stream, rb_intern("fileno"), 0);
if(fileno == Qnil)
rb_raise(rb_eArgError, "can't get file descriptor from stream");
/* Duplicate the file descriptor and re-open
* it. Then, make it into a ruby File object
* and assign it to an instance variable.
* This prevents a problem when the File
* object passed to this function is closed
* before the connection object is. */
old_fd = NUM2INT(fileno);
new_fd = dup(old_fd);
new_fp = fdopen(new_fd, "w");
if(new_fp == NULL)
rb_raise(rb_eArgError, "stream is not writable");
new_file = rb_funcall(rb_cIO, rb_intern("new"), 1, INT2NUM(new_fd));
this->trace_stream = new_file;
PQtrace(this->pgconn, new_fp);
return Qnil;
}
/*
* call-seq:
* conn.untrace() -> nil
*
* Disables the message tracing.
*/
static VALUE
pgconn_untrace(VALUE self)
{
t_pg_connection *this = pg_get_connection_safe( self );
PQuntrace(this->pgconn);
rb_funcall(this->trace_stream, rb_intern("close"), 0);
this->trace_stream = Qnil;
return Qnil;
}
/*
* Notice callback proxy function -- delegate the callback to the
* currently-registered Ruby notice_receiver object.
*/
void
notice_receiver_proxy(void *arg, const PGresult *pgresult)
{
VALUE self = (VALUE)arg;
t_pg_connection *this = pg_get_connection( self );
if (this->notice_receiver != Qnil) {
VALUE result = pg_new_result_autoclear( (PGresult *)pgresult, self );
rb_funcall(this->notice_receiver, rb_intern("call"), 1, result);
pg_result_clear( result );
}
return;
}
/*
* call-seq:
* conn.set_notice_receiver {|result| ... } -> Proc
*
* Notice and warning messages generated by the server are not returned
* by the query execution functions, since they do not imply failure of
* the query. Instead they are passed to a notice handling function, and
* execution continues normally after the handler returns. The default
* notice handling function prints the message on stderr, but the
* application can override this behavior by supplying its own handling
* function.
*
* For historical reasons, there are two levels of notice handling, called the
* notice receiver and notice processor. The default behavior is for the notice
* receiver to format the notice and pass a string to the notice processor for
* printing. However, an application that chooses to provide its own notice
* receiver will typically ignore the notice processor layer and just do all
* the work in the notice receiver.
*
* This function takes a new block to act as the handler, which should
* accept a single parameter that will be a PG::Result object, and returns
* the Proc object previously set, or +nil+ if it was previously the default.
*
* If you pass no arguments, it will reset the handler to the default.
*
* *Note:* The +result+ passed to the block should not be used outside
* of the block, since the corresponding C object could be freed after the
* block finishes.
*/
static VALUE
pgconn_set_notice_receiver(VALUE self)
{
VALUE proc, old_proc;
t_pg_connection *this = pg_get_connection_safe( self );
/* If default_notice_receiver is unset, assume that the current
* notice receiver is the default, and save it to a global variable.
* This should not be a problem because the default receiver is
* always the same, so won't vary among connections.
*/
if(default_notice_receiver == NULL)
default_notice_receiver = PQsetNoticeReceiver(this->pgconn, NULL, NULL);
old_proc = this->notice_receiver;
if( rb_block_given_p() ) {
proc = rb_block_proc();
PQsetNoticeReceiver(this->pgconn, gvl_notice_receiver_proxy, (void *)self);
} else {
/* if no block is given, set back to default */
proc = Qnil;
PQsetNoticeReceiver(this->pgconn, default_notice_receiver, NULL);
}
this->notice_receiver = proc;
return old_proc;
}
/*
* Notice callback proxy function -- delegate the callback to the
* currently-registered Ruby notice_processor object.
*/
void
notice_processor_proxy(void *arg, const char *message)
{
VALUE self = (VALUE)arg;
t_pg_connection *this = pg_get_connection( self );
if (this->notice_receiver != Qnil) {
VALUE message_str = rb_tainted_str_new2(message);
PG_ENCODING_SET_NOCHECK( message_str, ENCODING_GET(self) );
rb_funcall(this->notice_receiver, rb_intern("call"), 1, message_str);
}
return;
}
/*
* call-seq:
* conn.set_notice_processor {|message| ... } -> Proc
*
* See #set_notice_receiver for the desription of what this and the
* notice_processor methods do.
*
* This function takes a new block to act as the notice processor and returns
* the Proc object previously set, or +nil+ if it was previously the default.
* The block should accept a single String object.
*
* If you pass no arguments, it will reset the handler to the default.
*/
static VALUE
pgconn_set_notice_processor(VALUE self)
{
VALUE proc, old_proc;
t_pg_connection *this = pg_get_connection_safe( self );
/* If default_notice_processor is unset, assume that the current
* notice processor is the default, and save it to a global variable.
* This should not be a problem because the default processor is
* always the same, so won't vary among connections.
*/
if(default_notice_processor == NULL)
default_notice_processor = PQsetNoticeProcessor(this->pgconn, NULL, NULL);
old_proc = this->notice_receiver;
if( rb_block_given_p() ) {
proc = rb_block_proc();
PQsetNoticeProcessor(this->pgconn, gvl_notice_processor_proxy, (void *)self);
} else {
/* if no block is given, set back to default */
proc = Qnil;
PQsetNoticeProcessor(this->pgconn, default_notice_processor, NULL);
}
this->notice_receiver = proc;
return old_proc;
}
/*
* call-seq:
* conn.get_client_encoding() -> String
*
* Returns the client encoding as a String.
*/
static VALUE
pgconn_get_client_encoding(VALUE self)
{
char *encoding = (char *)pg_encoding_to_char(PQclientEncoding(pg_get_pgconn(self)));
return rb_tainted_str_new2(encoding);
}
/*
* call-seq:
* conn.set_client_encoding( encoding )
*
* Sets the client encoding to the _encoding_ String.
*/
static VALUE
pgconn_set_client_encoding(VALUE self, VALUE str)
{
PGconn *conn = pg_get_pgconn( self );
Check_Type(str, T_STRING);
if ( (PQsetClientEncoding(conn, StringValueCStr(str))) == -1 ) {
rb_raise(rb_ePGerror, "invalid encoding name: %s",StringValueCStr(str));
}
#ifdef M17N_SUPPORTED
pgconn_set_internal_encoding_index( self );
#endif
return Qnil;
}
/*
* call-seq:
* conn.transaction { |conn| ... } -> result of the block
*
* Executes a +BEGIN+ at the start of the block,
* and a +COMMIT+ at the end of the block, or
* +ROLLBACK+ if any exception occurs.
*/
static VALUE
pgconn_transaction(VALUE self)
{
PGconn *conn = pg_get_pgconn(self);
PGresult *result;
VALUE rb_pgresult;
VALUE block_result = Qnil;
int status;
if (rb_block_given_p()) {
result = gvl_PQexec(conn, "BEGIN");
rb_pgresult = pg_new_result(result, self);
pg_result_check(rb_pgresult);
block_result = rb_protect(rb_yield, self, &status);
if(status == 0) {
result = gvl_PQexec(conn, "COMMIT");
rb_pgresult = pg_new_result(result, self);
pg_result_check(rb_pgresult);
}
else {
/* exception occurred, ROLLBACK and re-raise */
result = gvl_PQexec(conn, "ROLLBACK");
rb_pgresult = pg_new_result(result, self);
pg_result_check(rb_pgresult);
rb_jump_tag(status);
}
}
else {
/* no block supplied? */
rb_raise(rb_eArgError, "Must supply block for PG::Connection#transaction");
}
return block_result;
}
/*
* call-seq:
* PG::Connection.quote_ident( str ) -> String
* conn.quote_ident( str ) -> String
*
* Returns a string that is safe for inclusion in a SQL query as an
* identifier. Note: this is not a quote function for values, but for
* identifiers.
*
* For example, in a typical SQL query: SELECT FOO FROM MYTABLE
* The identifier FOO is folded to lower case, so it actually
* means foo. If you really want to access the case-sensitive
* field name FOO, use this function like
* PG::Connection.quote_ident('FOO'), which will return "FOO"
* (with double-quotes). PostgreSQL will see the double-quotes, and
* it will not fold to lower case.
*
* Similarly, this function also protects against special characters,
* and other things that might allow SQL injection if the identifier
* comes from an untrusted source.
*/
static VALUE
pgconn_s_quote_ident(VALUE self, VALUE in_str)
{
VALUE ret;
char *str = StringValuePtr(in_str);
/* result size at most NAMEDATALEN*2 plus surrounding
* double-quotes. */
char buffer[NAMEDATALEN*2+2];
unsigned int i=0,j=0;
unsigned int str_len = RSTRING_LENINT(in_str);
if(str_len >= NAMEDATALEN) {
rb_raise(rb_eArgError,
"Input string is longer than NAMEDATALEN-1 (%d)",
NAMEDATALEN-1);
}
buffer[j++] = '"';
for(i = 0; i < str_len && str[i]; i++) {
if(str[i] == '"')
buffer[j++] = '"';
buffer[j++] = str[i];
}
buffer[j++] = '"';
ret = rb_str_new(buffer,j);
OBJ_INFECT(ret, in_str);
PG_ENCODING_SET_NOCHECK(ret, ENCODING_GET( rb_obj_class(self) == rb_cPGconn ? self : in_str ));
return ret;
}
static void *
get_result_readable(PGconn *conn)
{
return gvl_PQisBusy(conn) ? NULL : (void*)1;
}
/*
* call-seq:
* conn.block( [ timeout ] ) -> Boolean
*
* Blocks until the server is no longer busy, or until the
* optional _timeout_ is reached, whichever comes first.
* _timeout_ is measured in seconds and can be fractional.
*
* Returns +false+ if _timeout_ is reached, +true+ otherwise.
*
* If +true+ is returned, +conn.is_busy+ will return +false+
* and +conn.get_result+ will not block.
*/
static VALUE
pgconn_block( int argc, VALUE *argv, VALUE self ) {
PGconn *conn = pg_get_pgconn( self );
/* If WIN32 and Ruby 1.9 do not use rb_thread_select() which sometimes hangs
* and does not wait (nor sleep) any time even if timeout is given.
* Instead use the Winsock events and rb_w32_wait_events(). */
struct timeval timeout;
struct timeval *ptimeout = NULL;
VALUE timeout_in;
double timeout_sec;
void *ret;
if ( rb_scan_args(argc, argv, "01", &timeout_in) == 1 ) {
timeout_sec = NUM2DBL( timeout_in );
timeout.tv_sec = (time_t)timeout_sec;
timeout.tv_usec = (suseconds_t)((timeout_sec - (long)timeout_sec) * 1e6);
ptimeout = &timeout;
}
ret = wait_socket_readable( conn, ptimeout, get_result_readable);
if( !ret )
return Qfalse;
return Qtrue;
}
/*
* call-seq:
* conn.get_last_result( ) -> PG::Result
*
* This function retrieves all available results
* on the current connection (from previously issued
* asynchronous commands like +send_query()+) and
* returns the last non-NULL result, or +nil+ if no
* results are available.
*
* This function is similar to #get_result
* except that it is designed to get one and only
* one result.
*/
static VALUE
pgconn_get_last_result(VALUE self)
{
PGconn *conn = pg_get_pgconn(self);
VALUE rb_pgresult = Qnil;
PGresult *cur, *prev;
cur = prev = NULL;
while ((cur = gvl_PQgetResult(conn)) != NULL) {
int status;
if (prev) PQclear(prev);
prev = cur;
status = PQresultStatus(cur);
if (status == PGRES_COPY_OUT || status == PGRES_COPY_IN)
break;
}
if (prev) {
rb_pgresult = pg_new_result( prev, self );
pg_result_check(rb_pgresult);
}
return rb_pgresult;
}
/*
* call-seq:
* conn.async_exec(sql [, params, result_format ] ) -> PG::Result
* conn.async_exec(sql [, params, result_format ] ) {|pg_result| block }
*
* This function has the same behavior as #exec,
* but is implemented using the asynchronous command
* processing API of libpq.
*/
static VALUE
pgconn_async_exec(int argc, VALUE *argv, VALUE self)
{
VALUE rb_pgresult = Qnil;
/* remove any remaining results from the queue */
pgconn_block( 0, NULL, self ); /* wait for input (without blocking) before reading the last result */
pgconn_get_last_result( self );
pgconn_send_query( argc, argv, self );
pgconn_block( 0, NULL, self );
rb_pgresult = pgconn_get_last_result( self );
if ( rb_block_given_p() ) {
return rb_ensure( rb_yield, rb_pgresult, pg_result_clear, rb_pgresult );
}
return rb_pgresult;
}
/**************************************************************************
* LARGE OBJECT SUPPORT
**************************************************************************/
/*
* call-seq:
* conn.lo_creat( [mode] ) -> Fixnum
*
* Creates a large object with mode _mode_. Returns a large object Oid.
* On failure, it raises PG::Error.
*/
static VALUE
pgconn_locreat(int argc, VALUE *argv, VALUE self)
{
Oid lo_oid;
int mode;
VALUE nmode;
PGconn *conn = pg_get_pgconn(self);
if (rb_scan_args(argc, argv, "01", &nmode) == 0)
mode = INV_READ;
else
mode = NUM2INT(nmode);
lo_oid = lo_creat(conn, mode);
if (lo_oid == 0)
rb_raise(rb_ePGerror, "lo_creat failed");
return UINT2NUM(lo_oid);
}
/*
* call-seq:
* conn.lo_create( oid ) -> Fixnum
*
* Creates a large object with oid _oid_. Returns the large object Oid.
* On failure, it raises PG::Error.
*/
static VALUE
pgconn_locreate(VALUE self, VALUE in_lo_oid)
{
Oid ret, lo_oid;
PGconn *conn = pg_get_pgconn(self);
lo_oid = NUM2UINT(in_lo_oid);
ret = lo_create(conn, lo_oid);
if (ret == InvalidOid)
rb_raise(rb_ePGerror, "lo_create failed");
return UINT2NUM(ret);
}
/*
* call-seq:
* conn.lo_import(file) -> Fixnum
*
* Import a file to a large object. Returns a large object Oid.
*
* On failure, it raises a PG::Error.
*/
static VALUE
pgconn_loimport(VALUE self, VALUE filename)
{
Oid lo_oid;
PGconn *conn = pg_get_pgconn(self);
Check_Type(filename, T_STRING);
lo_oid = lo_import(conn, StringValueCStr(filename));
if (lo_oid == 0) {
rb_raise(rb_ePGerror, "%s", PQerrorMessage(conn));
}
return UINT2NUM(lo_oid);
}
/*
* call-seq:
* conn.lo_export( oid, file ) -> nil
*
* Saves a large object of _oid_ to a _file_.
*/
static VALUE
pgconn_loexport(VALUE self, VALUE lo_oid, VALUE filename)
{
PGconn *conn = pg_get_pgconn(self);
Oid oid;
Check_Type(filename, T_STRING);
oid = NUM2UINT(lo_oid);
if (lo_export(conn, oid, StringValueCStr(filename)) < 0) {
rb_raise(rb_ePGerror, "%s", PQerrorMessage(conn));
}
return Qnil;
}
/*
* call-seq:
* conn.lo_open( oid, [mode] ) -> Fixnum
*
* Open a large object of _oid_. Returns a large object descriptor
* instance on success. The _mode_ argument specifies the mode for
* the opened large object,which is either +INV_READ+, or +INV_WRITE+.
*
* If _mode_ is omitted, the default is +INV_READ+.
*/
static VALUE
pgconn_loopen(int argc, VALUE *argv, VALUE self)
{
Oid lo_oid;
int fd, mode;
VALUE nmode, selfid;
PGconn *conn = pg_get_pgconn(self);
rb_scan_args(argc, argv, "11", &selfid, &nmode);
lo_oid = NUM2UINT(selfid);
if(NIL_P(nmode))
mode = INV_READ;
else
mode = NUM2INT(nmode);
if((fd = lo_open(conn, lo_oid, mode)) < 0) {
rb_raise(rb_ePGerror, "can't open large object: %s", PQerrorMessage(conn));
}
return INT2FIX(fd);
}
/*
* call-seq:
* conn.lo_write( lo_desc, buffer ) -> Fixnum
*
* Writes the string _buffer_ to the large object _lo_desc_.
* Returns the number of bytes written.
*/
static VALUE
pgconn_lowrite(VALUE self, VALUE in_lo_desc, VALUE buffer)
{
int n;
PGconn *conn = pg_get_pgconn(self);
int fd = NUM2INT(in_lo_desc);
Check_Type(buffer, T_STRING);
if( RSTRING_LEN(buffer) < 0) {
rb_raise(rb_ePGerror, "write buffer zero string");
}
if((n = lo_write(conn, fd, StringValuePtr(buffer),
RSTRING_LEN(buffer))) < 0) {
rb_raise(rb_ePGerror, "lo_write failed: %s", PQerrorMessage(conn));
}
return INT2FIX(n);
}
/*
* call-seq:
* conn.lo_read( lo_desc, len ) -> String
*
* Attempts to read _len_ bytes from large object _lo_desc_,
* returns resulting data.
*/
static VALUE
pgconn_loread(VALUE self, VALUE in_lo_desc, VALUE in_len)
{
int ret;
PGconn *conn = pg_get_pgconn(self);
int len = NUM2INT(in_len);
int lo_desc = NUM2INT(in_lo_desc);
VALUE str;
char *buffer;
buffer = ALLOC_N(char, len);
if(buffer == NULL)
rb_raise(rb_eNoMemError, "ALLOC failed!");
if (len < 0){
rb_raise(rb_ePGerror,"nagative length %d given", len);
}
if((ret = lo_read(conn, lo_desc, buffer, len)) < 0)
rb_raise(rb_ePGerror, "lo_read failed");
if(ret == 0) {
xfree(buffer);
return Qnil;
}
str = rb_tainted_str_new(buffer, ret);
xfree(buffer);
return str;
}
/*
* call-seq:
* conn.lo_lseek( lo_desc, offset, whence ) -> Fixnum
*
* Move the large object pointer _lo_desc_ to offset _offset_.
* Valid values for _whence_ are +SEEK_SET+, +SEEK_CUR+, and +SEEK_END+.
* (Or 0, 1, or 2.)
*/
static VALUE
pgconn_lolseek(VALUE self, VALUE in_lo_desc, VALUE offset, VALUE whence)
{
PGconn *conn = pg_get_pgconn(self);
int lo_desc = NUM2INT(in_lo_desc);
int ret;
if((ret = lo_lseek(conn, lo_desc, NUM2INT(offset), NUM2INT(whence))) < 0) {
rb_raise(rb_ePGerror, "lo_lseek failed");
}
return INT2FIX(ret);
}
/*
* call-seq:
* conn.lo_tell( lo_desc ) -> Fixnum
*
* Returns the current position of the large object _lo_desc_.
*/
static VALUE
pgconn_lotell(VALUE self, VALUE in_lo_desc)
{
int position;
PGconn *conn = pg_get_pgconn(self);
int lo_desc = NUM2INT(in_lo_desc);
if((position = lo_tell(conn, lo_desc)) < 0)
rb_raise(rb_ePGerror,"lo_tell failed");
return INT2FIX(position);
}
/*
* call-seq:
* conn.lo_truncate( lo_desc, len ) -> nil
*
* Truncates the large object _lo_desc_ to size _len_.
*/
static VALUE
pgconn_lotruncate(VALUE self, VALUE in_lo_desc, VALUE in_len)
{
PGconn *conn = pg_get_pgconn(self);
int lo_desc = NUM2INT(in_lo_desc);
size_t len = NUM2INT(in_len);
if(lo_truncate(conn,lo_desc,len) < 0)
rb_raise(rb_ePGerror,"lo_truncate failed");
return Qnil;
}
/*
* call-seq:
* conn.lo_close( lo_desc ) -> nil
*
* Closes the postgres large object of _lo_desc_.
*/
static VALUE
pgconn_loclose(VALUE self, VALUE in_lo_desc)
{
PGconn *conn = pg_get_pgconn(self);
int lo_desc = NUM2INT(in_lo_desc);
if(lo_close(conn,lo_desc) < 0)
rb_raise(rb_ePGerror,"lo_close failed");
return Qnil;
}
/*
* call-seq:
* conn.lo_unlink( oid ) -> nil
*
* Unlinks (deletes) the postgres large object of _oid_.
*/
static VALUE
pgconn_lounlink(VALUE self, VALUE in_oid)
{
PGconn *conn = pg_get_pgconn(self);
Oid oid = NUM2UINT(in_oid);
if(lo_unlink(conn,oid) < 0)
rb_raise(rb_ePGerror,"lo_unlink failed");
return Qnil;
}
#ifdef M17N_SUPPORTED
void
pgconn_set_internal_encoding_index( VALUE self )
{
PGconn *conn = pg_get_pgconn(self);
rb_encoding *enc = pg_conn_enc_get( conn );
PG_ENCODING_SET_NOCHECK( self, rb_enc_to_index(enc));
}
/*
* call-seq:
* conn.internal_encoding -> Encoding
*
* defined in Ruby 1.9 or later.
*
* Returns:
* * an Encoding - client_encoding of the connection as a Ruby Encoding object.
* * nil - the client_encoding is 'SQL_ASCII'
*/
static VALUE
pgconn_internal_encoding(VALUE self)
{
PGconn *conn = pg_get_pgconn( self );
rb_encoding *enc = pg_conn_enc_get( conn );
if ( enc ) {
return rb_enc_from_encoding( enc );
} else {
return Qnil;
}
}
static VALUE pgconn_external_encoding(VALUE self);
/*
* call-seq:
* conn.internal_encoding = value
*
* A wrapper of #set_client_encoding.
* defined in Ruby 1.9 or later.
*
* +value+ can be one of:
* * an Encoding
* * a String - a name of Encoding
* * +nil+ - sets the client_encoding to SQL_ASCII.
*/
static VALUE
pgconn_internal_encoding_set(VALUE self, VALUE enc)
{
VALUE enc_inspect;
if (NIL_P(enc)) {
pgconn_set_client_encoding( self, rb_usascii_str_new_cstr("SQL_ASCII") );
return enc;
}
else if ( TYPE(enc) == T_STRING && strcasecmp("JOHAB", StringValueCStr(enc)) == 0 ) {
pgconn_set_client_encoding(self, rb_usascii_str_new_cstr("JOHAB"));
return enc;
}
else {
rb_encoding *rbenc = rb_to_encoding( enc );
const char *name = pg_get_rb_encoding_as_pg_encoding( rbenc );
if ( PQsetClientEncoding(pg_get_pgconn( self ), name) == -1 ) {
VALUE server_encoding = pgconn_external_encoding( self );
rb_raise( rb_eEncCompatError, "incompatible character encodings: %s and %s",
rb_enc_name(rb_to_encoding(server_encoding)), name );
}
pgconn_set_internal_encoding_index( self );
return enc;
}
enc_inspect = rb_inspect(enc);
rb_raise( rb_ePGerror, "unknown encoding: %s", StringValueCStr(enc_inspect) );
return Qnil;
}
/*
* call-seq:
* conn.external_encoding() -> Encoding
*
* Return the +server_encoding+ of the connected database as a Ruby Encoding object.
* The SQL_ASCII encoding is mapped to to ASCII_8BIT.
*/
static VALUE
pgconn_external_encoding(VALUE self)
{
t_pg_connection *this = pg_get_connection_safe( self );
rb_encoding *enc = NULL;
const char *pg_encname = NULL;
/* Use cached value if found */
if ( RTEST(this->external_encoding) ) return this->external_encoding;
pg_encname = PQparameterStatus( this->pgconn, "server_encoding" );
enc = pg_get_pg_encname_as_rb_encoding( pg_encname );
this->external_encoding = rb_enc_from_encoding( enc );
return this->external_encoding;
}
/*
* call-seq:
* conn.set_default_encoding() -> Encoding
*
* If Ruby has its Encoding.default_internal set, set PostgreSQL's client_encoding
* to match. Returns the new Encoding, or +nil+ if the default internal encoding
* wasn't set.
*/
static VALUE
pgconn_set_default_encoding( VALUE self )
{
PGconn *conn = pg_get_pgconn( self );
rb_encoding *enc;
const char *encname;
if (( enc = rb_default_internal_encoding() )) {
encname = pg_get_rb_encoding_as_pg_encoding( enc );
if ( PQsetClientEncoding(conn, encname) != 0 )
rb_warn( "Failed to set the default_internal encoding to %s: '%s'",
encname, PQerrorMessage(conn) );
pgconn_set_internal_encoding_index( self );
return rb_enc_from_encoding( enc );
} else {
pgconn_set_internal_encoding_index( self );
return Qnil;
}
}
#endif /* M17N_SUPPORTED */
/*
* call-seq:
* res.type_map_for_queries = typemap
*
* Set the default TypeMap that is used for type casts of query bind parameters.
*
* +typemap+ must be a kind of PG::TypeMap .
*
*/
static VALUE
pgconn_type_map_for_queries_set(VALUE self, VALUE typemap)
{
t_pg_connection *this = pg_get_connection( self );
if ( !rb_obj_is_kind_of(typemap, rb_cTypeMap) ) {
rb_raise( rb_eTypeError, "wrong argument type %s (expected kind of PG::TypeMap)",
rb_obj_classname( typemap ) );
}
Check_Type(typemap, T_DATA);
this->type_map_for_queries = typemap;
return typemap;
}
/*
* call-seq:
* res.type_map_for_queries -> TypeMap
*
* Returns the default TypeMap that is currently set for type casts of query
* bind parameters.
*
*/
static VALUE
pgconn_type_map_for_queries_get(VALUE self)
{
t_pg_connection *this = pg_get_connection( self );
return this->type_map_for_queries;
}
/*
* call-seq:
* res.type_map_for_results = typemap
*
* Set the default TypeMap that is used for type casts of result values.
*
* +typemap+ must be a kind of PG::TypeMap .
*
*/
static VALUE
pgconn_type_map_for_results_set(VALUE self, VALUE typemap)
{
t_pg_connection *this = pg_get_connection( self );
if ( !rb_obj_is_kind_of(typemap, rb_cTypeMap) ) {
rb_raise( rb_eTypeError, "wrong argument type %s (expected kind of PG::TypeMap)",
rb_obj_classname( typemap ) );
}
Check_Type(typemap, T_DATA);
this->type_map_for_results = typemap;
return typemap;
}
/*
* call-seq:
* res.type_map_for_results -> TypeMap
*
* Returns the default TypeMap that is currently set for type casts of result values.
*
*/
static VALUE
pgconn_type_map_for_results_get(VALUE self)
{
t_pg_connection *this = pg_get_connection( self );
return this->type_map_for_results;
}
/*
* call-seq:
* res.encoder_for_put_copy_data = encoder
*
* Set the default coder that is used for type casting of parameters
* to #put_copy_data .
*
* +encoder+ can be:
* * a kind of PG::Coder
* * +nil+ - disable type encoding, data must be a String.
*
*/
static VALUE
pgconn_encoder_for_put_copy_data_set(VALUE self, VALUE typemap)
{
t_pg_connection *this = pg_get_connection( self );
if( typemap != Qnil ){
if ( !rb_obj_is_kind_of(typemap, rb_cPG_Coder) ) {
rb_raise( rb_eTypeError, "wrong argument type %s (expected kind of PG::Coder)",
rb_obj_classname( typemap ) );
}
Check_Type(typemap, T_DATA);
}
this->encoder_for_put_copy_data = typemap;
return typemap;
}
/*
* call-seq:
* res.encoder_for_put_copy_data -> PG::Coder
*
* Returns the default coder object that is currently set for type casting of parameters
* to #put_copy_data .
*
* Returns either:
* * a kind of PG::Coder
* * +nil+ - type encoding is disabled, returned data will be a String.
*
*/
static VALUE
pgconn_encoder_for_put_copy_data_get(VALUE self)
{
t_pg_connection *this = pg_get_connection( self );
return this->encoder_for_put_copy_data;
}
/*
* call-seq:
* res.decoder_for_get_copy_data = decoder
*
* Set the default coder that is used for type casting of received data
* by #get_copy_data .
*
* +decoder+ can be:
* * a kind of PG::Coder
* * +nil+ - disable type decoding, returned data will be a String.
*
*/
static VALUE
pgconn_decoder_for_get_copy_data_set(VALUE self, VALUE typemap)
{
t_pg_connection *this = pg_get_connection( self );
if( typemap != Qnil ){
if ( !rb_obj_is_kind_of(typemap, rb_cPG_Coder) ) {
rb_raise( rb_eTypeError, "wrong argument type %s (expected kind of PG::Coder)",
rb_obj_classname( typemap ) );
}
Check_Type(typemap, T_DATA);
}
this->decoder_for_get_copy_data = typemap;
return typemap;
}
/*
* call-seq:
* res.decoder_for_get_copy_data -> PG::Coder
*
* Returns the default coder object that is currently set for type casting of received
* data by #get_copy_data .
*
* Returns either:
* * a kind of PG::Coder
* * +nil+ - type encoding is disabled, returned data will be a String.
*
*/
static VALUE
pgconn_decoder_for_get_copy_data_get(VALUE self)
{
t_pg_connection *this = pg_get_connection( self );
return this->decoder_for_get_copy_data;
}
void
init_pg_connection()
{
s_id_encode = rb_intern("encode");
sym_type = ID2SYM(rb_intern("type"));
sym_format = ID2SYM(rb_intern("format"));
sym_value = ID2SYM(rb_intern("value"));
rb_cPGconn = rb_define_class_under( rb_mPG, "Connection", rb_cObject );
rb_include_module(rb_cPGconn, rb_mPGconstants);
/****** PG::Connection CLASS METHODS ******/
rb_define_alloc_func( rb_cPGconn, pgconn_s_allocate );
SINGLETON_ALIAS(rb_cPGconn, "connect", "new");
SINGLETON_ALIAS(rb_cPGconn, "open", "new");
SINGLETON_ALIAS(rb_cPGconn, "setdb", "new");
SINGLETON_ALIAS(rb_cPGconn, "setdblogin", "new");
rb_define_singleton_method(rb_cPGconn, "escape_string", pgconn_s_escape, 1);
SINGLETON_ALIAS(rb_cPGconn, "escape", "escape_string");
rb_define_singleton_method(rb_cPGconn, "escape_bytea", pgconn_s_escape_bytea, 1);
rb_define_singleton_method(rb_cPGconn, "unescape_bytea", pgconn_s_unescape_bytea, 1);
rb_define_singleton_method(rb_cPGconn, "encrypt_password", pgconn_s_encrypt_password, 2);
rb_define_singleton_method(rb_cPGconn, "quote_ident", pgconn_s_quote_ident, 1);
rb_define_singleton_method(rb_cPGconn, "connect_start", pgconn_s_connect_start, -1);
rb_define_singleton_method(rb_cPGconn, "conndefaults", pgconn_s_conndefaults, 0);
#ifdef HAVE_PQPING
rb_define_singleton_method(rb_cPGconn, "ping", pgconn_s_ping, -1);
#endif
/****** PG::Connection INSTANCE METHODS: Connection Control ******/
rb_define_method(rb_cPGconn, "initialize", pgconn_init, -1);
rb_define_method(rb_cPGconn, "connect_poll", pgconn_connect_poll, 0);
rb_define_method(rb_cPGconn, "finish", pgconn_finish, 0);
rb_define_method(rb_cPGconn, "finished?", pgconn_finished_p, 0);
rb_define_method(rb_cPGconn, "reset", pgconn_reset, 0);
rb_define_method(rb_cPGconn, "reset_start", pgconn_reset_start, 0);
rb_define_method(rb_cPGconn, "reset_poll", pgconn_reset_poll, 0);
rb_define_alias(rb_cPGconn, "close", "finish");
/****** PG::Connection INSTANCE METHODS: Connection Status ******/
rb_define_method(rb_cPGconn, "db", pgconn_db, 0);
rb_define_method(rb_cPGconn, "user", pgconn_user, 0);
rb_define_method(rb_cPGconn, "pass", pgconn_pass, 0);
rb_define_method(rb_cPGconn, "host", pgconn_host, 0);
#ifdef HAVE_PQHOSTADDR
rb_define_method(rb_cPGconn, "hostaddr", pgconn_hostaddr, 0);
#endif
rb_define_method(rb_cPGconn, "port", pgconn_port, 0);
rb_define_method(rb_cPGconn, "tty", pgconn_tty, 0);
#ifdef HAVE_PQCONNINFO
rb_define_method(rb_cPGconn, "conninfo", pgconn_conninfo, 0);
#endif
rb_define_method(rb_cPGconn, "options", pgconn_options, 0);
rb_define_method(rb_cPGconn, "status", pgconn_status, 0);
rb_define_method(rb_cPGconn, "transaction_status", pgconn_transaction_status, 0);
rb_define_method(rb_cPGconn, "parameter_status", pgconn_parameter_status, 1);
rb_define_method(rb_cPGconn, "protocol_version", pgconn_protocol_version, 0);
rb_define_method(rb_cPGconn, "server_version", pgconn_server_version, 0);
rb_define_method(rb_cPGconn, "error_message", pgconn_error_message, 0);
rb_define_method(rb_cPGconn, "socket", pgconn_socket, 0);
#if !defined(_WIN32) || defined(HAVE_RB_W32_WRAP_IO_HANDLE)
rb_define_method(rb_cPGconn, "socket_io", pgconn_socket_io, 0);
#endif
rb_define_method(rb_cPGconn, "backend_pid", pgconn_backend_pid, 0);
rb_define_method(rb_cPGconn, "connection_needs_password", pgconn_connection_needs_password, 0);
rb_define_method(rb_cPGconn, "connection_used_password", pgconn_connection_used_password, 0);
/* rb_define_method(rb_cPGconn, "getssl", pgconn_getssl, 0); */
/****** PG::Connection INSTANCE METHODS: Command Execution ******/
rb_define_method(rb_cPGconn, "exec", pgconn_exec, -1);
rb_define_alias(rb_cPGconn, "query", "exec");
rb_define_method(rb_cPGconn, "exec_params", pgconn_exec_params, -1);
rb_define_method(rb_cPGconn, "prepare", pgconn_prepare, -1);
rb_define_method(rb_cPGconn, "exec_prepared", pgconn_exec_prepared, -1);
rb_define_method(rb_cPGconn, "describe_prepared", pgconn_describe_prepared, 1);
rb_define_method(rb_cPGconn, "describe_portal", pgconn_describe_portal, 1);
rb_define_method(rb_cPGconn, "make_empty_pgresult", pgconn_make_empty_pgresult, 1);
rb_define_method(rb_cPGconn, "escape_string", pgconn_s_escape, 1);
rb_define_alias(rb_cPGconn, "escape", "escape_string");
#ifdef HAVE_PQESCAPELITERAL
rb_define_method(rb_cPGconn, "escape_literal", pgconn_escape_literal, 1);
#endif
#ifdef HAVE_PQESCAPEIDENTIFIER
rb_define_method(rb_cPGconn, "escape_identifier", pgconn_escape_identifier, 1);
#endif
rb_define_method(rb_cPGconn, "escape_bytea", pgconn_s_escape_bytea, 1);
rb_define_method(rb_cPGconn, "unescape_bytea", pgconn_s_unescape_bytea, 1);
#ifdef HAVE_PQSETSINGLEROWMODE
rb_define_method(rb_cPGconn, "set_single_row_mode", pgconn_set_single_row_mode, 0);
#endif
/****** PG::Connection INSTANCE METHODS: Asynchronous Command Processing ******/
rb_define_method(rb_cPGconn, "send_query", pgconn_send_query, -1);
rb_define_method(rb_cPGconn, "send_prepare", pgconn_send_prepare, -1);
rb_define_method(rb_cPGconn, "send_query_prepared", pgconn_send_query_prepared, -1);
rb_define_method(rb_cPGconn, "send_describe_prepared", pgconn_send_describe_prepared, 1);
rb_define_method(rb_cPGconn, "send_describe_portal", pgconn_send_describe_portal, 1);
rb_define_method(rb_cPGconn, "get_result", pgconn_get_result, 0);
rb_define_method(rb_cPGconn, "consume_input", pgconn_consume_input, 0);
rb_define_method(rb_cPGconn, "is_busy", pgconn_is_busy, 0);
rb_define_method(rb_cPGconn, "setnonblocking", pgconn_setnonblocking, 1);
rb_define_method(rb_cPGconn, "isnonblocking", pgconn_isnonblocking, 0);
rb_define_alias(rb_cPGconn, "nonblocking?", "isnonblocking");
rb_define_method(rb_cPGconn, "flush", pgconn_flush, 0);
/****** PG::Connection INSTANCE METHODS: Cancelling Queries in Progress ******/
rb_define_method(rb_cPGconn, "cancel", pgconn_cancel, 0);
/****** PG::Connection INSTANCE METHODS: NOTIFY ******/
rb_define_method(rb_cPGconn, "notifies", pgconn_notifies, 0);
/****** PG::Connection INSTANCE METHODS: COPY ******/
rb_define_method(rb_cPGconn, "put_copy_data", pgconn_put_copy_data, -1);
rb_define_method(rb_cPGconn, "put_copy_end", pgconn_put_copy_end, -1);
rb_define_method(rb_cPGconn, "get_copy_data", pgconn_get_copy_data, -1);
/****** PG::Connection INSTANCE METHODS: Control Functions ******/
rb_define_method(rb_cPGconn, "set_error_verbosity", pgconn_set_error_verbosity, 1);
rb_define_method(rb_cPGconn, "trace", pgconn_trace, 1);
rb_define_method(rb_cPGconn, "untrace", pgconn_untrace, 0);
/****** PG::Connection INSTANCE METHODS: Notice Processing ******/
rb_define_method(rb_cPGconn, "set_notice_receiver", pgconn_set_notice_receiver, 0);
rb_define_method(rb_cPGconn, "set_notice_processor", pgconn_set_notice_processor, 0);
/****** PG::Connection INSTANCE METHODS: Other ******/
rb_define_method(rb_cPGconn, "get_client_encoding", pgconn_get_client_encoding, 0);
rb_define_method(rb_cPGconn, "set_client_encoding", pgconn_set_client_encoding, 1);
rb_define_alias(rb_cPGconn, "client_encoding=", "set_client_encoding");
rb_define_method(rb_cPGconn, "transaction", pgconn_transaction, 0);
rb_define_method(rb_cPGconn, "block", pgconn_block, -1);
rb_define_method(rb_cPGconn, "wait_for_notify", pgconn_wait_for_notify, -1);
rb_define_alias(rb_cPGconn, "notifies_wait", "wait_for_notify");
rb_define_method(rb_cPGconn, "quote_ident", pgconn_s_quote_ident, 1);
rb_define_method(rb_cPGconn, "async_exec", pgconn_async_exec, -1);
rb_define_alias(rb_cPGconn, "async_query", "async_exec");
rb_define_method(rb_cPGconn, "get_last_result", pgconn_get_last_result, 0);
/****** PG::Connection INSTANCE METHODS: Large Object Support ******/
rb_define_method(rb_cPGconn, "lo_creat", pgconn_locreat, -1);
rb_define_alias(rb_cPGconn, "locreat", "lo_creat");
rb_define_method(rb_cPGconn, "lo_create", pgconn_locreate, 1);
rb_define_alias(rb_cPGconn, "locreate", "lo_create");
rb_define_method(rb_cPGconn, "lo_import", pgconn_loimport, 1);
rb_define_alias(rb_cPGconn, "loimport", "lo_import");
rb_define_method(rb_cPGconn, "lo_export", pgconn_loexport, 2);
rb_define_alias(rb_cPGconn, "loexport", "lo_export");
rb_define_method(rb_cPGconn, "lo_open", pgconn_loopen, -1);
rb_define_alias(rb_cPGconn, "loopen", "lo_open");
rb_define_method(rb_cPGconn, "lo_write",pgconn_lowrite, 2);
rb_define_alias(rb_cPGconn, "lowrite", "lo_write");
rb_define_method(rb_cPGconn, "lo_read",pgconn_loread, 2);
rb_define_alias(rb_cPGconn, "loread", "lo_read");
rb_define_method(rb_cPGconn, "lo_lseek",pgconn_lolseek, 3);
rb_define_alias(rb_cPGconn, "lolseek", "lo_lseek");
rb_define_alias(rb_cPGconn, "lo_seek", "lo_lseek");
rb_define_alias(rb_cPGconn, "loseek", "lo_lseek");
rb_define_method(rb_cPGconn, "lo_tell",pgconn_lotell, 1);
rb_define_alias(rb_cPGconn, "lotell", "lo_tell");
rb_define_method(rb_cPGconn, "lo_truncate", pgconn_lotruncate, 2);
rb_define_alias(rb_cPGconn, "lotruncate", "lo_truncate");
rb_define_method(rb_cPGconn, "lo_close",pgconn_loclose, 1);
rb_define_alias(rb_cPGconn, "loclose", "lo_close");
rb_define_method(rb_cPGconn, "lo_unlink", pgconn_lounlink, 1);
rb_define_alias(rb_cPGconn, "lounlink", "lo_unlink");
#ifdef M17N_SUPPORTED
rb_define_method(rb_cPGconn, "internal_encoding", pgconn_internal_encoding, 0);
rb_define_method(rb_cPGconn, "internal_encoding=", pgconn_internal_encoding_set, 1);
rb_define_method(rb_cPGconn, "external_encoding", pgconn_external_encoding, 0);
rb_define_method(rb_cPGconn, "set_default_encoding", pgconn_set_default_encoding, 0);
#endif /* M17N_SUPPORTED */
rb_define_method(rb_cPGconn, "type_map_for_queries=", pgconn_type_map_for_queries_set, 1);
rb_define_method(rb_cPGconn, "type_map_for_queries", pgconn_type_map_for_queries_get, 0);
rb_define_method(rb_cPGconn, "type_map_for_results=", pgconn_type_map_for_results_set, 1);
rb_define_method(rb_cPGconn, "type_map_for_results", pgconn_type_map_for_results_get, 0);
rb_define_method(rb_cPGconn, "encoder_for_put_copy_data=", pgconn_encoder_for_put_copy_data_set, 1);
rb_define_method(rb_cPGconn, "encoder_for_put_copy_data", pgconn_encoder_for_put_copy_data_get, 0);
rb_define_method(rb_cPGconn, "decoder_for_get_copy_data=", pgconn_decoder_for_get_copy_data_set, 1);
rb_define_method(rb_cPGconn, "decoder_for_get_copy_data", pgconn_decoder_for_get_copy_data_get, 0);
}