使用Map和模糊查询

Map和模糊查询

在某些时候我们只需要给MyBatis传递几个参数而不是一个完整的对象，如仅仅update表中的两三个属性。此时parameterType设置为一个pojo显然不合适。可以考虑使用Map

mapper.xml

    <update id="updateName" parameterType="map">
        # 使用map传递参数在sql中直接取出key即可
        update mybatis.employee
        set last_name=#{last_name},
            email=#{email}
        where empid = #{empid}
    </update>

//接口
int updateName(Map map);

测试类

@Test
	public void test2(){
		SqlSession sqlSession = MyBatisUtil.getSqlSession();
		EmpMapper empMapper = sqlSession.getMapper(EmpMapper.class);

		Map<String ,String> map= new HashMap();

		map.put("empid","1002");
		map.put("last_name","李商隐");
		map.put("email","LiSy@163.com");

		empMapper.updateName(map);

		sqlSession.commit();
		sqlSession.close();

	}

模糊查询例子

1. mapper.xml

       <select id="getEmpListByName" resultType="com.maple.pojo.Employee">
           select *
           from mybatis.employee
           where last_name like #{value}
       </select>
   

2. j接口

   	List<Employee> getEmpListByName(String value);
   

3. 测试类

   	@Test
   	public void test3(){
   		SqlSession sqlSession = MyBatisUtil.getSqlSession();
   		EmpMapper empMapper = sqlSession.getMapper(EmpMapper.class);
   
   		List<Employee> list = empMapper.getEmpListByName("%李%");
   
   		for(Employee employee : list){
   			System.out.println(employee);
   		}
   
   		sqlSession.commit();
   		sqlSession.close();
   
   	}