[技术干货] MySql逗号拼接字符串查询方法

下面两个函数的使用和FIND_IN_SET一样,使用时只需要把FIND_IN_SET换成FIND_PART_IN_SETFIND_ALL_PART_IN_SET

例如某字段里是为1,2,3,4,5 

使用方法:

第一种,传入1,3,6  可以查出来

select * from XXX where FIND_PART_IN_SET('1,3,6','1,2,3,4,5')

第二种,传入1,3,6  查不出来

select * from XXX where FIND_ALL_PART_IN_SET('1,3,6','1,2,3,4,5')

函数:

第一种:只要包含其中一个就可以被查出来

CREATE DEFINER = `root`@`%` FUNCTION `NewProc`(str1 text,str2 text)
RETURNS text
BEGIN
#传入两个逗号分割的字符串,判断第二个字符串是否包含第一个字符串split之后的单个
DECLARE CURRENTINDEX INT;#当前下标
DECLARE CURRENTSTR text;
DECLARE result int;
set result = 0;
set CURRENTINDEX = 0;
set CURRENTSTR = '';
IF str1 IS NOT NULL AND str1 != '' THEN
SET CURRENTINDEX = LOCATE(',',str1);
WHILE CURRENTINDEX > 0 DO
SET CURRENTSTR = substring(str1,1,CURRENTINDEX-1);
if FIND_IN_SET(CURRENTSTR,str2) THEN
 set result = 1;
end if;
SET str1 = substring(str1,CURRENTINDEX+1);
SET CURRENTINDEX = LOCATE(',',str1);
END WHILE;
#只传一个 和 最后无逗号的情况
IF LENGTH(str1) > 0 THEN
if FIND_IN_SET(str1,str2) THEN
 set result = 1;
end if;
END IF;
END IF;
RETURN result;
END;

第二种:必须全部包含才可以被查出来

CREATE DEFINER = `root`@`%` FUNCTION `NewProc`(str1 text,str2 text)
RETURNS text
BEGIN
#传入两个逗号分割的字符串,判断第二个字符串是否全部包含第一个字符串split之后的单个
DECLARE CURRENTINDEX INT;#当前下标
DECLARE CURRENTSTR text;
DECLARE RESULT int;
DECLARE TOTALCOUNT int;
DECLARE TRUECOUNT int;
set RESULT = 0;
set CURRENTINDEX = 0;
set CURRENTSTR = '';
set TOTALCOUNT = 0;
set TRUECOUNT = 0;
IF str1 IS NOT NULL AND str1 != '' THEN
SET CURRENTINDEX = LOCATE(',',str1);
WHILE CURRENTINDEX > 0 DO
SET TOTALCOUNT = TOTALCOUNT + 1;
SET CURRENTSTR = substring(str1,1,CURRENTINDEX-1);
if FIND_IN_SET(CURRENTSTR,str2) THEN
 SET TRUECOUNT = TRUECOUNT + 1;
end if;
SET str1 = substring(str1,CURRENTINDEX+1);
SET CURRENTINDEX = LOCATE(',',str1);
END WHILE;
#只传一个 和 最后无逗号的情况
IF LENGTH(str1) > 0 THEN
SET TOTALCOUNT = TOTALCOUNT + 1;
if FIND_IN_SET(str1,str2) THEN
 SET TRUECOUNT = TRUECOUNT + 1;
end if;
END IF;
END IF;
IF TOTALCOUNT > 0 AND TRUECOUNT = TOTALCOUNT THEN
SET RESULT = 1;
END IF;
RETURN result;
END;