Executes a prepared statement on an available connection. If the prepared statement already exists for the connection and has the same SQL, reuse it, otherwise, prepare the new statement. Issue a SET query with literalized values for each argument, then an EXECUTE to execute the query with the arguments.
# File lib/sequel/adapters/utils/mysql_prepared_statements.rb, line 14 def execute_prepared_statement(ps_name, opts, &block) args = opts[:arguments] ps = prepared_statement(ps_name) sql = ps.prepared_sql synchronize(opts[:server]) do |conn| unless conn.prepared_statements[ps_name] == sql _execute(conn, "PREPARE #{ps_name} FROM #{literal(sql)}", opts) conn.prepared_statements[ps_name] = sql end i = 0 _execute(conn, "SET " + args.map {|arg| "@sequel_arg_#{i+=1} = #{literal(arg)}"}.join(", "), opts) unless args.empty? opts = opts.merge(:log_sql=>" (#{sql})") if ps.log_sql _execute(conn, "EXECUTE #{ps_name}#{" USING #{(1..i).map{|j| "@sequel_arg_#{j}"}.join(', ')}" unless i == 0}", opts, &block) end end