module Sequel::Dataset::EmulatePreparedStatementMethods
Prepared statements emulation support for adapters that don't support native prepared statements. Uses a placeholder literalizer to hold the prepared sql with the ability to interpolate arguments to prepare the final SQL string.
Public Instance Methods
run(&block)
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Calls superclass method
# File lib/sequel/dataset/prepared_statements.rb, line 273 def run(&block) if @opts[:prepared_sql_frags] sql = literal(Sequel::SQL::PlaceholderLiteralString.new(@opts[:prepared_sql_frags], @opts[:bind_arguments], false)) clone(:prepared_sql_frags=>nil, :sql=>sql, :prepared_sql=>sql).run(&block) else super end end
Private Instance Methods
emulate_prepared_statements?()
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Turn emulation of prepared statements back on, since ArgumentMapper turns it off.
# File lib/sequel/dataset/prepared_statements.rb, line 286 def emulate_prepared_statements? true end
emulated_prepared_statement(type, name, values)
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# File lib/sequel/dataset/prepared_statements.rb, line 290 def emulated_prepared_statement(type, name, values) prepared_sql, frags = Sequel::Dataset::PlaceholderLiteralizer::Recorder.new.send(:prepared_sql_and_frags, self, prepared_args) do |pl, ds| ds = ds.clone(:recorder=>pl) case type when :first, :single_value ds.limit(1) when :update, :insert, :insert_select, :delete ds.with_sql(:"#{type}_sql", *values) when :insert_pk ds.with_sql(:insert_sql, *values) else ds end end prepared_args.freeze clone(:prepared_sql_frags=>frags, :prepared_sql=>prepared_sql, :sql=>prepared_sql) end
prepared_arg(k)
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Associates the argument with name k with the next position in the output array.
# File lib/sequel/dataset/prepared_statements.rb, line 312 def prepared_arg(k) prepared_args << k @opts[:recorder].arg end
subselect_sql_dataset(sql, ds)
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Calls superclass method
# File lib/sequel/dataset/prepared_statements.rb, line 317 def subselect_sql_dataset(sql, ds) super.clone(:recorder=>@opts[:recorder]). with_extend(EmulatePreparedStatementMethods) end