exec_stmt_and_free

# File activerecord/lib/active_record/connection_adapters/mysql/database_statements.rb, line 86
        def exec_stmt_and_free(sql, name, binds, cache_stmt: false)
          if @connection
            # make sure we carry over any changes to ActiveRecord::Base.default_timezone that have been
            # made since we established the connection
            @connection.query_options[:database_timezone] = ActiveRecord::Base.default_timezone
          end

          type_casted_binds = binds.map { |attr| type_cast(attr.value_for_database) }

          log(sql, name, binds) do
            if cache_stmt
              cache = @statements[sql] ||= {
                stmt: @connection.prepare(sql)
              }
              stmt = cache[:stmt]
            else
              stmt = @connection.prepare(sql)
            end

            begin
              result = stmt.execute(*type_casted_binds)
            rescue Mysql2::Error => e
              if cache_stmt
                @statements.delete(sql)
              else
                stmt.close
              end
              raise e
            end

            ret = yield stmt, result
            result.free if result
            stmt.close unless cache_stmt
            ret
          end
        end