使用Map和模糊查詢

Map和模糊查詢

在某些時候我們只需要給MyBatis傳遞幾個參數而不是一個完整的對象，如僅僅update表中的兩三個屬性。此時parameterType設置為一個pojo顯然不合適。可以考慮使用Map

mapper.xml

    <update id="updateName" parameterType="map">
        # 使用map傳遞參數在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);

測試類

@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","李商隱");
		map.put("email","[e-mail]");

		empMapper.updateName(map);

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

	}

模糊查詢例子

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. 測試類

   	@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();
   
   	}