mysql去掉html标签

 SET GLOBAL log_bin_trust_function_creators=1;
DROP FUNCTION IF EXISTS fnStripTags;
DELIMITER |
CREATE FUNCTION fnStripTags( Dirty varchar(4000) )
RETURNS varchar(4000)
DETERMINISTIC 
BEGIN
  DECLARE iStart, iEnd, iLength int;
    WHILE Locate( '<', Dirty ) > 0 And Locate( '>', Dirty, Locate( '<', Dirty )) > 0 DO
      BEGIN
        SET iStart = Locate( '<', Dirty ), iEnd = Locate( '>', Dirty, Locate('<', Dirty ));
        SET iLength = ( iEnd - iStart) + 1;
        IF iLength > 0 THEN
          BEGIN
            SET Dirty = Insert( Dirty, iStart, iLength, '');
          END;
        END IF;
      END;
    END WHILE;
    RETURN Dirty;
END;
|
DELIMITER ;
SELECT fnStripTags('this is a test, nothing more');

如果中文 乱码，设置入口参数编码和返回编码即可

DROP FUNCTION IF EXISTS fnStripTags;  
DELIMITER |  
CREATE FUNCTION fnStripTags( Dirty varchar(4000) CHARSET utf8)  
RETURNS varchar(4000) CHARSET utf8

DETERMINISTIC   
BEGIN  
  DECLARE iStart, iEnd, iLength int;  
    WHILE Locate( '<', Dirty ) > 0 And Locate( '>', Dirty, Locate( '<', Dirty )) > 0 DO  
      BEGIN  
        SET iStart = Locate( '<', Dirty ), iEnd = Locate( '>', Dirty, Locate('<', Dirty ));  
        SET iLength = ( iEnd - iStart) + 1;  
        IF iLength > 0 THEN  
          BEGIN  
            SET Dirty = Insert( Dirty, iStart, iLength, '');  
          END;  
        END IF;  
      END;  
    END WHILE;  
    RETURN Dirty;  
END;  
|  
DELIMITER ;  

另外一种方式：

DROP FUNCTION IF EXISTS strip_tags;  
DELIMITER |  
CREATE FUNCTION `strip_tags`($str text) RETURNS text  
BEGIN 
    DECLARE $start, $end INT DEFAULT 1;  
    LOOP  
        SET $start = LOCATE('<', $str, $start);  
        IF (!$start) THEN RETURN $str; END IF;  
        SET $end = LOCATE('>', $str, $start);  
        IF (!$end) THEN SET $end = $start; END IF;  
        SET $str = INSERT($str, $start, $end - $start + 1, "");  
    END LOOP;  
END; 

https://forums.mysql.com/read.php?52,177343,177985#msg-177985