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プログラマーとプログラミングに熱心な人々のための質問と回答

DECLARE @tag_link_table TABLE (TagName nvarchar(35), Link nvarchar(max));

DECLARE @tag_name nvarchar(35);
DECLARE @tag_wiki_id int;
DECLARE @tag_wiki nvarchar(max);

DECLARE @link nvarchar(max);
DECLARE @link_index int;
DECLARE @link_end int;

DECLARE tag_cursor CURSOR FOR
SELECT TagName, WikiPostId FROM Tags

OPEN tag_cursor;

FETCH NEXT FROM tag_cursor INTO @tag_name, @tag_wiki_id;
WHILE @@FETCH_STATUS = 0
BEGIN
    SET @tag_wiki = (SELECT TOP(1) Body FROM Posts WHERE Id = @tag_wiki_id);
    SET @link_index = PATINDEX('%http:%', @tag_wiki);
    WHILE @link_index > 0
    BEGIN
        SET @tag_wiki = SUBSTRING(@tag_wiki, @link_index, LEN(@tag_wiki) - @link_index);
        
        SET @link_end = PATINDEX('% %', @tag_wiki);
        IF @link_end > 0
             SET @link = SUBSTRING(@tag_wiki, 1, @link_end - 2);
        ELSE
             SET @link = @tag_wiki;
        
        INSERT INTO @tag_link_table VALUES(@tag_name, @link);
        
        SET @tag_wiki = SUBSTRING(@tag_wiki, 2, LEN(@tag_wiki));
        SET @link_index = PATINDEX('%http:%', @tag_wiki);
    END
   
    FETCH NEXT FROM tag_cursor INTO @tag_name, @tag_wiki_id;
END

CLOSE tag_cursor;
DEALLOCATE tag_cursor;

SELECT TagName, Link
FROM @tag_link_table
WHERE Link NOT LIKE '%isfdb%'
AND Link NOT LIKE '%alastairreynolds%'
AND Link NOT LIKE '%georgerrmartin%'
ORDER BY TagName

fork query

edited aug 23 19

created jun 12 19 anonymous