mysql增、删、改、查语句
例子：
创建表：
create table tutorials_tbl( id INT NOT NULL AUTO_INCREMENT, title VARCHAR(100) NOT NULL, author VARCHAR(40) NOT NULL, date DATE, PRIMARY KEY ( id ));
语句：
添加： insert into ba_user(`username`,`password`)VALUES('张三',MD5('123456'));
查询：select * from ba_user;
修改：UPDATE ba_user SET username='小里' WHERE id=9;
删除：DELETE FROM ba_user WHERE id=9;