mybatis框架，使用foreach实现复杂结果的查询循环集合数组

需求：假定现在查询出用户角色是2和3指定的用户列表信息，并进行展示

接口：

/**
* 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_Array(Integer[] roleids);

mapper.xml文件

 

    <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>
    <select id="getUserListByRoleid_Array" resultMap="userListArray" >
       select * from smbms_user where userRole in 
       <foreach collection="array" item="roleids" open="("  separator="," close=")">
           #{roleids}
       </foreach>
    </select>

 编写对应的测试方法：

    @Test
    public void testGetUserByForeach_Array(){
        SqlSession sqlSession = null;
        List<User> userList = new ArrayList<User>();
        Integer[] userArray={2,3};
        try {
            sqlSession = MyBatisUtil.createSqlSession();
            userList = sqlSession.getMapper(UserMapper.class).getUserListByRoleid_Array(userArray);
            
        } catch (Exception e) {
            // TODO: handle exception
            e.printStackTrace();
        }finally{
            MyBatisUtil.closeSqlSession(sqlSession);
        }
        for(User user: userList){
            logger.debug("testGetUserListAddressByUserId UserCode: " + user.getUserCode() + " and UserName: " + user.getUserName()+"and userRole:"+user.getUserRole());
        }
    
            
    }

运行结果：

[DEBUG] 2019-12-17 11:32:24,987 cn.smbms.dao.user.UserMapper.getUserListByRoleid_Array - ==> Preparing: select * from smbms_user where userRole in ( ? , ? )
[DEBUG] 2019-12-17 11:32:25,003 cn.smbms.dao.user.UserMapper.getUserListByRoleid_Array - ==> Parameters: 2(Integer), 3(Integer)
[DEBUG] 2019-12-17 11:32:25,020 org.apache.ibatis.transaction.jdbc.JdbcTransaction - Resetting autocommit to true on JDBC Connection [com.mysql.jdbc.JDBC4Connection@4a6397eb]
[DEBUG] 2019-12-17 11:32:25,021 org.apache.ibatis.transaction.jdbc.JdbcTransaction - Closing JDBC Connection [com.mysql.jdbc.JDBC4Connection@4a6397eb]
[DEBUG] 2019-12-17 11:32:25,021 org.apache.ibatis.datasource.pooled.PooledDataSource - Returned connection 1248040939 to pool.
[DEBUG] 2019-12-17 11:32:25,021 cn.smbms.dao.user.UserMapperTest - testGetUserListAddressByUserId UserCode: liming and UserName: 李明and userRole:2
[DEBUG] 2019-12-17 11:32:25,021 cn.smbms.dao.user.UserMapperTest - testGetUserListAddressByUserId UserCode: hanlubiao and UserName: 韩路彪and userRole:2
[DEBUG] 2019-12-17 11:32:25,021 cn.smbms.dao.user.UserMapperTest - testGetUserListAddressByUserId UserCode: zhanghua and UserName: 张华and userRole:3
[DEBUG] 2019-12-17 11:32:25,021 cn.smbms.dao.user.UserMapperTest - testGetUserListAddressByUserId UserCode: wangyang and UserName: 王洋and userRole:3
[DEBUG] 2019-12-17 11:32:25,021 cn.smbms.dao.user.UserMapperTest - testGetUserListAddressByUserId UserCode: zhaoyan and UserName: 赵燕and userRole:3
[DEBUG] 2019-12-17 11:32:25,021 cn.smbms.dao.user.UserMapperTest - testGetUserListAddressByUserId UserCode: sunlei and UserName: 孙磊and userRole:3
[DEBUG] 2019-12-17 11:32:25,021 cn.smbms.dao.user.UserMapperTest - testGetUserListAddressByUserId UserCode: sunxing and UserName: 孙兴and userRole:3
[DEBUG] 2019-12-17 11:32:25,021 cn.smbms.dao.user.UserMapperTest - testGetUserListAddressByUserId UserCode: zhangchen and UserName: 张晨and userRole:3
[DEBUG] 2019-12-17 11:32:25,021 cn.smbms.dao.user.UserMapperTest - testGetUserListAddressByUserId UserCode: dengchao and UserName: 邓超and userRole:3
[DEBUG] 2019-12-17 11:32:25,021 cn.smbms.dao.user.UserMapperTest - testGetUserListAddressByUserId UserCode: yangguo and UserName: 杨过and userRole:3
[DEBUG] 2019-12-17 11:32:25,021 cn.smbms.dao.user.UserMapperTest - testGetUserListAddressByUserId UserCode: zhaomin and UserName: 赵敏and userRole:2