1.插入数据
INSERT INTO phpyun_member(username,password,email,salt) VALUES ('','c33d068cf260dc210cfca27ce1ffdccf','','a3206c');
2.插入数据不重复
INSERT INTO phpyun_member(username,email) SELECT '45611','3135' FROM DUAL WHERE NOT EXISTS(SELECT username FROM phpyun_member where username = '45612');
3.修改数据
update phpyun_member set username="123" where uid="1";
4.查询数据
select * from phpyun_member;
5.删除数据
delete from phpyun_member where uname= '123';

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