mybatis框架，使用foreach实现复杂结果的查询--循环List集合方式

Posted 2021-03-21 dongyaotou

需求，根据用户角色列表  查询用户列表信息 

之前我们传入的参数是Array，一个数组的形式，现在我们传入的是一个List集合，其他条件没有变化。

/**
* 需求：传入指定的用户角色，用户角色有1-n,获取这些用户角色下的用户列表信息
* @param roleids
* @return
*/
public List<User> getUserListByRoleid_List(List<Integer> roleList);

 

<resultMap type="User" id="userListArray">
        <id property="id" column="id"/>
　　<result property="userCode" column="userCode" />
　　<result property="userName" column="userName" />
　　<result property="userRole" column="userRole" />
</resultMap>

<!-- 使用第二中方式机型入参，传入的参数是list集合 -->
<select id="getUserListByRoleid_List" resultMap="userListArray" >
　　select * from smbms_user where userRole in
 　　<foreach collection="list" item="roleList" open="(" separator="," close=")">
 　　#{roleList}
　　</foreach>
</select>

 

 1 //传入List集合的方式
 2     @Test
 3     public void testGetUserByForeach_List(){
 4         SqlSession sqlSession = null;
 5         List<Integer> userList = new ArrayList<Integer>();
 6         userList.add(2);
 7         userList.add(3);
 8         List<User> userListShow=new ArrayList<User>();
 9         try {
10             sqlSession = MyBatisUtil.createSqlSession();
11             userListShow = sqlSession.getMapper(UserMapper.class).getUserListByRoleid_List(userList);
12             
13         } catch (Exception e) {
14             // TODO: handle exception
15             e.printStackTrace();
16         }finally{
17             MyBatisUtil.closeSqlSession(sqlSession);
18         }
19         for(User user: userListShow){
20             logger.debug("testGetUserListAddressByUserId UserCode: " + user.getUserCode() + " and UserName: " + user.getUserName()+"and userRole:"+user.getUserRole());
21         }
22     
23             
24     }

运行结果：

 1 [DEBUG] 2019-12-22 15:13:43,496 cn.smbms.dao.user.UserMapper.getUserListByRoleid_List - ooo Using Connection [com.mysql.jdbc.JDBC4Connection@28bb494b]
 2 [DEBUG] 2019-12-22 15:13:43,496 cn.smbms.dao.user.UserMapper.getUserListByRoleid_List - ==>  Preparing: select * from smbms_user where userRole in ( ? , ? ) 
 3 [DEBUG] 2019-12-22 15:13:43,514 cn.smbms.dao.user.UserMapper.getUserListByRoleid_List - ==> Parameters: 2(Integer), 3(Integer)
 4 [DEBUG] 2019-12-22 15:13:43,550 org.apache.ibatis.transaction.jdbc.JdbcTransaction - Resetting autocommit to true on JDBC Connection [com.mysql.jdbc.JDBC4Connection@28bb494b]
 5 [DEBUG] 2019-12-22 15:13:43,551 org.apache.ibatis.transaction.jdbc.JdbcTransaction - Closing JDBC Connection [com.mysql.jdbc.JDBC4Connection@28bb494b]
 6 [DEBUG] 2019-12-22 15:13:43,551 org.apache.ibatis.datasource.pooled.PooledDataSource - Returned connection 683362635 to pool.
 7 [DEBUG] 2019-12-22 15:13:43,551 cn.smbms.dao.user.UserMapperTest - testGetUserListAddressByUserId UserCode: liming and UserName: 李明and userRole:2
 8 [DEBUG] 2019-12-22 15:13:43,551 cn.smbms.dao.user.UserMapperTest - testGetUserListAddressByUserId UserCode: hanlubiao and UserName: 韩路彪and userRole:2
 9 [DEBUG] 2019-12-22 15:13:43,551 cn.smbms.dao.user.UserMapperTest - testGetUserListAddressByUserId UserCode: zhanghua and UserName: 张华and userRole:3
10 [DEBUG] 2019-12-22 15:13:43,551 cn.smbms.dao.user.UserMapperTest - testGetUserListAddressByUserId UserCode: wangyang and UserName: 王洋and userRole:3
11 [DEBUG] 2019-12-22 15:13:43,551 cn.smbms.dao.user.UserMapperTest - testGetUserListAddressByUserId UserCode: zhaoyan and UserName: 赵燕and userRole:3
12 [DEBUG] 2019-12-22 15:13:43,551 cn.smbms.dao.user.UserMapperTest - testGetUserListAddressByUserId UserCode: sunlei and UserName: 孙磊and userRole:3
13 [DEBUG] 2019-12-22 15:13:43,551 cn.smbms.dao.user.UserMapperTest - testGetUserListAddressByUserId UserCode: sunxing and UserName: 孙兴and userRole:3
14 [DEBUG] 2019-12-22 15:13:43,551 cn.smbms.dao.user.UserMapperTest - testGetUserListAddressByUserId UserCode: zhangchen and UserName: 张晨and userRole:3
15 [DEBUG] 2019-12-22 15:13:43,551 cn.smbms.dao.user.UserMapperTest - testGetUserListAddressByUserId UserCode: dengchao and UserName: 邓超and userRole:3
16 [DEBUG] 2019-12-22 15:13:43,551 cn.smbms.dao.user.UserMapperTest - testGetUserListAddressByUserId UserCode: yangguo and UserName: 杨过and userRole:3
17 [DEBUG] 2019-12-22 15:13:43,551 cn.smbms.dao.user.UserMapperTest - testGetUserListAddressByUserId UserCode: zhaomin and UserName: 赵敏and userRole:2