MySql存储逗号分隔的字符串为临时表

1. 存储过程方式：

DELIMITER $
SET @branch_array='0000,0001,0002,0003,0004,0005,0006,0007';
DROP PROCEDURE IF EXISTS `split_branch_sp`;
CREATE PROCEDURE `split_branch_sp` ( IN _string VARCHAR ( 8000 ) ) 
BEGIN
	DECLARE _index INT;
	DROP TEMPORARY TABLE IF EXISTS `branch_tmp_tb`;
	CREATE TEMPORARY TABLE `branch_tmp_tb` 
	(
		branch_no VARCHAR ( 255 ) 
	);
	
	SET _index = locate( ',', _string );
	WHILE _index > 0 
	DO
			INSERT INTO `branch_tmp_tb` VALUES ( LEFT ( _string, _index - 1 ) );	
			SET _string = substr( _string FROM _index + 1 );
			SET _index = locate( ',', _string );
	END WHILE;
	IF length( _string ) > 0 
	THEN
			INSERT INTO `branch_tmp_tb` VALUES ( _string );
	END IF;
	SELECT * FROM `branch_tmp_tb`;
END $

2. 非存储过程方式：

SET @role_ids = '2016,2017,2018,2019,2020';
DROP TEMPORARY TABLE IF EXISTS `branch_tmp_tb`;
	CREATE TEMPORARY TABLE `branch_tmp_tb` 
	(
		branch_no VARCHAR ( 255 ) 
	);
	
INSERT INTO `branch_tmp_tb`
(
SELECT
	SUBSTRING_INDEX( SUBSTRING_INDEX( @role_ids, ',', ht.help_topic_id + 1 ), ',', -1 ) AS roleId 
FROM
mysql.help_topic ht 
WHERE
ht.help_topic_id < ( LENGTH( @role_ids ) - LENGTH( REPLACE ( @role_ids, ',', '' )) + 1 ) 
);
SELECT * FROM `branch_tmp_tb`;

注意： MySql中临时表只能被联合查询一次。 With 用方8.0后才支持