一、前言

如果多個引數不是業務模型中的資料，沒有對應的POJO，為了方便，我們直接封裝成Map傳入。#{key}取出map中對應的值。

二、案例

在UserMapper.java增加查詢方法findUserByMapParam，如下：

/**
 * 封裝Map作為傳遞引數的載體
* @param user
* @return
 */
public User findUserByMapParam(Map<String,Object> map);

UserMapper.xml檔案修改如下：

<select id="findUserByMapParam"  parameterType="map"  resultType="com.queen.mybatis.bean.User">
	select id, loginId, userName, role, note from t_user where id = #{id}
</select>
 

增加測試方法testMapParam如下：

@Test
public void testMapParam() throws IOException {
	SqlSessionFactory sqlSessionFactory = getSqlSessionFactory();
	SqlSession openSession = sqlSessionFactory.openSession();
	try {
		UserMapper mapper = openSession.getMapper(UserMapper.class);
		Map<String,Object> map =new HashMap<String,Object>();
		map.put("id", 1);
		User user = mapper.findUserByMapParam(map);
		System.out.println(user);
	} finally {
		openSession.close();
	}
}
 

測試查詢功能，控制檯列印如下：

2017-08-05 09:05:00,041 [main] [com.queen.mybatis.mapper.UserMapper.findUserByMapParam]-[DEBUG] ==>  Preparing: select id, loginId, userName, role, note from t_user where id = ? 
2017-08-05 09:05:00,108 [main] [com.queen.mybatis.mapper.UserMapper.findUserByMapParam]-[DEBUG] ==> Parameters: 1(Integer)
2017-08-05 09:05:00,158 [main] [com.queen.mybatis.mapper.UserMapper.findUserByMapParam]-[DEBUG] <==      Total: 1
User [id=1, loginId=queen, userName=奎恩, role=海賊王副把手, note=專門負責提鞋的。。。]
 

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