mybatis 注解开发 DML

1.添加用户

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//03_1 DML 添加用户
    @Insert("insert into users values(default,#{username},#{usersex})")
    int insertUsers(Users users);

2.删除用户

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//03_2 DML 修改用户
    @Update("update users set username=#{username}, usersex=#{usersex} where userid = #{userid}")
    int updateUsers(Users users);

3.修改用户

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//03_3 DML 删除用户
    @Delete("delete from users where userid=#{userid}")
    int deleteUsers(int userid);