找了好久,想通过mysql把字符串以‘,’拆分成多个数据,必须用存储过程来实现这个功能,在这里实现一下这个功能,例如将
转为
排除里面的N,然后把数字提取出来:
#查看已存在的存储过程:SHOW PROCEDURE STATUS
# 函数:func_split_TotalLength DELIMITER $$ DROP function IF EXISTS `func_split_TotalLength` $$ CREATE FUNCTION `func_split_TotalLength` (f_string varchar(1000),f_delimiter varchar(5)) RETURNS int(11) BEGIN
# 计算传入字符串的总length return 1+(length(f_string) - length(replace(f_string,f_delimiter,''))); END $$ DELIMITER;
# 函数:func_split DELIMITER $$ DROP function IF EXISTS `func_split` $$ CREATE FUNCTION `func_split` (f_string varchar(1000),f_delimiter varchar(5),f_order int) RETURNS varchar(255) CHARSET utf8 BEGIN
# 拆分传入的字符串,返回拆分后的新字符串 declare result varchar(255) default ''; set result = reverse(substring_index(reverse(substring_index(f_string,f_delimiter,f_order)),f_delimiter,1)); return result; END$$ DELIMITER;
# 存储过程:splitString DELIMITER $$ DROP PROCEDURE IF EXISTS `splitString` $$ CREATE PROCEDURE `splitString` (IN f_string varchar(1000),IN f_delimiter varchar(10)) BEGIN
# 拆分结果 declare cnt int default 0; declare i int default 0; set cnt = func_split_TotalLength(f_string,f_delimiter); DROP TABLE IF EXISTS `tmp_split`; create temporary table `tmp_split` (`status` varchar(128) not null) DEFAULT CHARSET=utf8; while i < cnt do set i = i + 1;
#插入除了'N'之外的所有数据 IF func_split(f_string,f_delimiter,i) != 'N' THEN insert into tmp_split(`status`) values (func_split(f_string,f_delimiter,i)); END IF; end while; END$$ DELIMITER;
call splitString( (SELECT overdue_record_2year FROM Loan l WHERE l.papers_id = 231203199305030219 ORDER BY papers_id DESC LIMIT 1) ,","); select * from tmp_split;
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