插入数据
INSERT INTO a_user (xm_user_name,xm_user_pwd) VALUES ("大白","124325436")
更新数据
update a_user set xm_user_pwd='mima123',xm_user_mail='972069047@qq.com' where xm_uid=20
删除语句
DELETE FROM a_user WHERE xm_uid=20
查询语句
SELECT xm_uid,xm_user_name FROM a_user WHERE xm_uid<10