递归显示数据（SSM）

1.SQL

#set global log_bin_trust_function_creators=TRUE;
DROP FUNCTION IF EXISTS `getChild`;
DELIMITER ;;
CREATE DEFINER=`root`@`::1` FUNCTION `getChild`(pid VARCHAR(8000)) RETURNS varchar(8000) CHARSET utf8
    COMMENT '获取所有孩子'
BEGIN
DECLARE sTemp VARCHAR(8000);
DECLARE sTempChd VARCHAR(8000);
 
SET sTemp='$';
SET sTempChd = pid;
 
WHILE sTempChd IS NOT NULL DO
SET sTemp= CONCAT(sTemp,',',sTempChd);
SELECT GROUP_CONCAT(id) INTO sTempChd FROM tree WHERE FIND_IN_SET(parent_id,sTempChd)>0;
END WHILE;
RETURN sTemp;
END
;;
DELIMITER ;

备注：递归的排序方式

ORDER BY SUBSTRING_INDEX((SELECT getOrganChild ('1')),id,1)

2.Mybatis

<select id="getChild" parameterType="java.lang.String" resultMap="BaseResultMap">
  	SELECT * FROM  tree 
		WHERE 1=1
		<if test="id != null">
		And FIND_IN_SET(id,getChild(#{id}))
		</if>
  </select>

3.Ajax

4.过程中遇到的问题：

①It's likely that neither a Result Type nor a Result Map was specified.

原因：mybatis 中没写resultType