mysql checks all sons according to the father, and checks the top parent according to the son

Oracle can use connect by prior to perform parent-child query, while mysql does not have this function and needs to write the process by itself.
Note: pi_orgId is the condition value; pi_isQueryChild: Whether to check the parent or child, true is to check all the sons, false is to check the top-level father; pi_columName is the list, pi_parentColumName is the parent column name, and pi_tableName is the table name.
The code example is as follows:

DELIMITER $$



USE `ivbs`$$



DROP PROCEDURE IF EXISTS `sp_recursive_query`$$



CREATE DEFINER=`root`@`%` PROCEDURE `sp_recursive_query`(IN pi_orgId VARCHAR(300),IN pi_isQueryChild BOOLEAN ,IN pi_columNam VARCHAR(50),IN pi_parentColumName VARCHAR(50) ,IN pi_tableName VARCHAR(50), OUT pi_out_str VARCHAR(1000))
BEGIN
    DECLARE sTemp VARCHAR (4000) ;
    SET sTemp = '$' ;
    SET @sTempChd = CAST(pi_orgId AS CHAR ) ;
    WHILE
    @sTempChd IS NOT NULL DO SET sTemp = CONCAT(sTemp, ',', @sTempChd ) ;
    IF pi_isQueryChild THEN
        -- 找儿子
          SET @V_SQL := CONCAT('SELECT  GROUP_CONCAT(',pi_columNam,') INTO @sTempChd  FROM test_myt WHERE FIND_IN_SET(' , pi_parentColumName,',\'',@sTempChd,'\') > 0') ;
         PREPARE stmt FROM @V_SQL;
          EXECUTE stmt  ;
         DEALLOCATE PREPARE  stmt;  
      ELSE
        -- 找父亲
         SET @V_SQL := CONCAT('SELECT  GROUP_CONCAT(',pi_parentColumName,') INTO @sTempChd  FROM test_myt WHERE FIND_IN_SET(' , pi_columNam,',\'',@sTempChd,'\') > 0');
         PREPARE stmt FROM @V_SQL;
         EXECUTE stmt;
         DEALLOCATE PREPARE  stmt;  
     END IF;
  END WHILE ;
  SET pi_out_str=sTemp;
END$$



DELIMITER ;

Call:
CALL sp_recursive_query('1',TRUE,'org_id','org_parent_id','table_name',@result);
SELECT @result;

Result: $ ,1,6,7,100,11,12 (through 1, find all the sons, this is the format of the result, find the father, pass false for the second parameter, the others are the same)