mysql函数split功能实现

 

先设置：SET GLOBAL log_bin_trust_function_creators = 1; 

 

1. 函数func_splitStringTotal：将字符串按指定方式分割，并计算单元总数 

DELIMITER $$ 
CREATE FUNCTION `func_get_splitStringTotal`( 
f_string varchar(10000),f_delimiter varchar(50) 
) RETURNS int(11) 
BEGIN 
return 1+(length(f_string) - length(replace(f_string,f_delimiter,''))); 
END$$ 
DELIMITER ; 

 

2.函数func_splitString：将字符串按指定方式分割，获取指定位置的数 

DELIMITER $$ 
DROP function IF EXISTS `func_splitString` $$ 
CREATE FUNCTION `func_splitString` 
( f_string varchar(1000),f_delimiter varchar(5),f_order int) 
RETURNS varchar(255) CHARSET utf8 
BEGIN 

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$$ 

SELECT func_splitString('1,2,3,4,5,6,7',',',1); 

 

3.过程splitString 将字符串分割，并放到临时表tmp_split 里面

DELIMITER $$ 
DROP PROCEDURE IF EXISTS `splitString` $$ 
CREATE PROCEDURE `splitString` 
(IN f_string varchar(1000),IN f_delimiter varchar(5)) 
BEGIN 
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` (`val_` varchar(128) not null) DEFAULT CHARSET=utf8; 
while i < cnt 
do 
set i = i + 1; 
insert into tmp_split(`val_`) values (func_split(f_string,f_delimiter,i)); 
end while; 
END$$ 

call splitString('a,s,d,f,g,h,j',','); 
SELECT * from tmp_split;