mySQL存储函数创建一个slu。 [英] mySQL Stored Function to create a slug

问题描述

是否有一个mysql存储函数用于从url（或者任何值）创建一个slug。

Is there a mysql stored function out there to create a slug from a url (or any value really).

所以我的查询可以是：

SELECT *, SLUG(url) FROM clients

推荐答案

这是上述函数的更新版本。它的速度要快得多，因为它避免了循环遍历所有允许的字符，并且通过比较ASCII码来进行检查。

This is an updated version of above function. It is much faster since it avoids looping through all of the allowed characters and just checks by comparing ASCII codes.

DROP FUNCTION IF EXISTS `slugify`;
DELIMITER ;;
CREATE DEFINER=`root`@`localhost`
FUNCTION `slugify`(dirty_string varchar(200))
RETURNS varchar(200) CHARSET latin1
DETERMINISTIC
BEGIN
    DECLARE x, y , z Int;
    Declare temp_string, new_string VarChar(200);
    Declare is_allowed Bool;
    Declare c, check_char VarChar(1);

    set temp_string = LOWER(dirty_string);

    Set temp_string = replace(temp_string, '&', ' and ');

    Select temp_string Regexp('[^a-z0-9\-]+') into x;
    If x = 1 then
        set z = 1;
        While z <= Char_length(temp_string) Do
            Set c = Substring(temp_string, z, 1);
            Set is_allowed = False;
            If !((ascii(c) = 45) or (ascii(c) >= 48 and ascii(c) <= 57) or (ascii(c) >= 97 and ascii(c) <= 122)) Then
                Set temp_string = Replace(temp_string, c, '-');
            End If;
            set z = z + 1;
        End While;
    End If;

    Select temp_string Regexp("^-|-$|'") into x;
    If x = 1 Then
        Set temp_string = Replace(temp_string, "'", '');
        Set z = Char_length(temp_string);
        Set y = Char_length(temp_string);
        Dash_check: While z > 1 Do
            If Strcmp(SubString(temp_string, -1, 1), '-') = 0 Then
                Set temp_string = Substring(temp_string,1, y-1);
                Set y = y - 1;
            Else
                Leave Dash_check;
            End If;
            Set z = z - 1;
        End While;
    End If;

    Repeat
        Select temp_string Regexp("--") into x;
        If x = 1 Then
            Set temp_string = Replace(temp_string, "--", "-");
        End If;
    Until x <> 1 End Repeat;

    If LOCATE('-', temp_string) = 1 Then
        Set temp_string = SUBSTRING(temp_string, 2);
    End If;

    Return temp_string;
END;;
DELIMITER ;

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