Refine some codes in Sequel.

Signed-off-by: 核心力量 <kernelforce@gmail.com>
Sequel.ResultSetIterator will no longer reset the cursor during initialization.

Signed-off-by: 核心力量 <kernelforce@gmail.com>
Refine some codes in Sequel.

Signed-off-by: 核心力量 <kernelforce@gmail.com>