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# This source file contains extensions to the abstract adapter.
module ActiveRecord #:nodoc:
module ConnectionAdapters #:nodoc:
# Extensions to the AbstractAdapter. In some cases a default implementation
# is provided, in others it is adapter-dependent and the method will
# raise a NotImplementedError if the adapter does not implement that method
class AbstractAdapter
# Truncate the specified table
def truncate(table_name)
execute("TRUNCATE TABLE #{table_name}")
end
# Bulk loading interface. Load the data from the specified file into the
# given table. Note that options will be adapter-dependent.
def bulk_load(file, table_name, options={})
raise ArgumentError, "#{file} does not exist" unless File.exist?(file)
raise ArgumentError, "#{table_name} does not exist" unless tables.include?(table_name)
do_bulk_load(file, table_name, options)
end
# SQL select into statement constructs a new table from the results
# of a select. It is used to select data from a table and create a new
# table with its result set at the same time. Note that this method
# name does not necessarily match the implementation. E.g. MySQL's
# version of this is 'CREATE TABLE ... AS SELECT ...'
def support_select_into_table?
false
end
# Add a chunk of SQL to the given query that will create a new table and
# execute the select into that table.
def add_select_into_table(new_table_name, sql_query)
raise NotImplementedError, "add_select_into_table is an abstract method"
end
protected
# for subclasses to implement
def do_bulk_load(file, table_name, options={})
raise NotImplementedError, "do_bulk_load is an abstract method"
end
end
end
end
Version data entries
11 entries across 11 versions & 5 rubygems