MySQL函数判断一串以逗号分割的字符串是否包含一串相同格式的字符串

Posted 2020-10-24 masterqin

（“a”,“b”,“c”,“d”），（“c”,“d”）  true

（“a”,“b”,“c”,“d”），（“c”,“e”）  false

 

 1 BEGIN
 2     DECLARE idx INT DEFAULT 0 ;   
 3     DECLARE len INT DEFAULT 0;
 4     DECLARE llen INT DEFAULT 0; 
 5     DECLARE clen INT DEFAULT 0; 
 6     DECLARE tmpStr varchar(255); 
 7     DECLARE curt varchar(255);
 8     SET len = LENGTH(setB);  
 9     WHILE idx < len DO  
10         SET idx = idx + 1;  
11         SET tmpStr = SUBSTRING_INDEX(setB,",",idx);  
12         SET clen = LENGTH(tmpStr);  
13         IF idx = 1 THEN SET curt = tmpStr;  
14         ELSE SET curt = SUBSTRING(setB,llen+2,clen-llen-1);  
15         END IF;  
16         IF FIND_IN_SET(curt,setA) > 0 THEN RETURN 1;  
17         END IF;  
18         IF clen <= llen THEN RETURN 0;  
19         END IF;  
20   
21         SET llen = clen;  
22     END WHILE;
23 
24     RETURN 0;
25 END