可以使用如下函数
SUBSTRING_INDEX( i.final_car_type, ' ', 1 )
也就是说,如果count是正数,那么就是从左往右数,第N个分隔符的左边的全部内容。相反,如果是负数,那么就是从右边开始数,第N个分隔符右边的所有内容
如果count 是1
如果count 是-1
DELIMITER $$ CREATE DEFINER=`root`@`%` PROCEDURE `proc_split_Id`(in selectIds blob(65535), in splitChar varchar(2)) BEGIN set @i=0; CREATE TEMPORARY TABLE if not exists Id_Result_s(Id long NOT NULL); truncate table Id_Result_s; SET @cnt = 1+(LENGTH(selectIds) - LENGTH(REPLACE(selectIds,splitChar,''))); set @i=1; start transaction; WHILE @i <=@cnt DO SET @result = REPLACE(SUBSTRING(SUBSTRING_INDEX(selectIds, splitChar, @i), LENGTH(SUBSTRING_INDEX(selectIds, splitChar, @i -1)) + 1), splitChar, ''); INSERT INTO Id_Result_s(Id) VALUES (@result ); SET @i = @i + 1; END WHILE; commit; END
selectIds为需要拆分的字符串,splitChar为分隔符. 拆分的结果保存在临时表Id_Result_s中.
while中有insert语句,循环插入.在while前后加上start transaction和commit可以提高效率.
以上为个人经验,希望能给大家一个参考,也希望大家多多支持。