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Contents
module ActiveRecord
module ConnectionAdapters
module Sqlserver
module CoreExt
module Explain
SQLSERVER_STATEMENT_PREFIX = "EXEC sp_executesql "
SQLSERVER_PARAM_MATCHER = /@\d+ =/
def exec_explain(queries)
unprepared_queries = queries.map { |sql, bind| [unprepare_sqlserver_statement(sql), bind] }
super(unprepared_queries)
end
private
# This is somewhat hacky, but it should reliably reformat our prepared sql statment
# which uses sp_executesql to just the first argument, then unquote it. Likewise our
# do_exec_query method should substitude the @n args withe the quoted values.
def unprepare_sqlserver_statement(sql)
if sql.starts_with?(SQLSERVER_STATEMENT_PREFIX)
executesql = sql.from(SQLSERVER_STATEMENT_PREFIX.length)
executesql_args = executesql.split(', ')
found_args = executesql_args.reject! { |arg| arg =~ SQLSERVER_PARAM_MATCHER }
executesql_args.pop if found_args && executesql_args.many?
executesql = executesql_args.join(', ').strip.match(/N'(.*)'/m)[1]
Utils.unquote_string(executesql)
else
sql
end
end
end
end
end
end
end
ActiveRecord::Base.extend ActiveRecord::ConnectionAdapters::Sqlserver::CoreExt::Explain
ActiveRecord::Relation.send :include, ActiveRecord::ConnectionAdapters::Sqlserver::CoreExt::Explain
Version data entries
11 entries across 11 versions & 2 rubygems