Mybatis中特殊SQL的执行的实现示例

//通过用户名模糊查询用户信息
List<user> getUserByLike(@Param("mohu") String mohu);

<!--List<User> getUserByLike(@Param("mohu") String mohu);-->
    <select id="getUserByLike" resultType="User">
        <!--select * from t_user where username like '%${mohu}%'-->
        <!--select * from t_user where username like concat('%',#{mohu},'%')-->
        <!--使用最多-->
        select * from t_user where username like "%"#{mohu}"%"
    </select>

@Test
    public void testGetUserByLike(){
        SqlSession sqlSession= SqlSessionUtil.getSqlSession();
        SpecialSQLMapper mapper=sqlSession.getMapper(SpecialSQLMapper.class);
        List<User> list= mapper.getUserByLike("a");
        list.forEach(System.out::println);
    }

//批量删除
    Integer deleteMoreUser(@Param("ids") String ids);

<!--Integer deleteMoreUser(@Param("ids") String ids);-->
    <delete id="deleteMoreUser">
        delete from t_user where id in(${ids})
    </delete>

@Test
    public void deleteMoreUser(){
        SqlSession sqlSession=SqlSessionUtil.getSqlSession();
        SpecialSQLMapper mapper=sqlSession.getMapper(SpecialSQLMapper.class);
        mapper.deleteMoreUser("8,9");
    }

//动态设置表名，查询所有的用户信息
    List<User> getUserList(@Param("tablename") String tablename);

<!--List<User> getUserList(@Param("tablename") String tablename);-->
    <select id="getUserList" resultType="User">
        select * from ${tablename}
    </select>

@Test
    public void testGetUserList(){
        SqlSession sqlSession=SqlSessionUtil.getSqlSession();
        SpecialSQLMapper mapper=sqlSession.getMapper(SpecialSQLMapper.class);
        List<User> list=mapper.getUserList("t_user");
        list.forEach(System.out::println);
    }

//添加用户信息，并获取自增的主键
    void insertUser(User user);

<!--void insertUser(User user);-->
    <insert id="insertUser" useGeneratedKeys="true" keyProperty="id">
        insert into t_user values(null,#{username},#{password},#{age},#{gender},#{email})
    </insert>

@Test
    public void testInsertUser(){
        SqlSession sqlSession=SqlSessionUtil.getSqlSession();
        SpecialSQLMapper mapper=sqlSession.getMapper(SpecialSQLMapper.class);
        User user= new User(null,"xiaoming","123222",23,"男","123456@qq.com");
        mapper.insertUser(user);
        System.out.println(user);
    }