mysql本身沒有去除html代碼的內建函數，但是在一些情況下，不得不在資料庫層次提取一些去除了html代碼的純文字。
經過Google後，找到了以下兩個函數，經測試，均可用。
SQL代碼
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 <html>is <b>a test</b>, nothing more</html>');
函數2：
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;
select strip_tags('<span>hel<b>lo <a href="world">wo<>rld</a> <<x>again<.');
補充：如果你是php程式員就不需要上面的方法了，直接有現在的代碼
<?php
$text = '<p>Test paragraph.</p><!-- Comment --> <a href="#fragment">Other text</a>';
echo strip_tags($text);
echo " ";
// 允許 <p> 和 <a>
echo strip_tags($text, '<p><a>');
?>
以上常式會輸出：
Test paragraph. Other text
<p>Test paragraph.</p> <a href="#fragment">Other text</a>
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