一点点风格不统一也要注意.

Signed-off-by: jack <jack.wgm@gmail.com>
SQL全大写吧,避免看晕.

Signed-off-by: jack <jack.wgm@gmail.com>
全部使用更可读的session获取接口.

Signed-off-by: jack <jack.wgm@gmail.com>