T-SQL function to HTML Decode

Sometimes you need to decode some text on the database side.
Sometimes you don’t.
In case you need to, here is one special function.

There will be some additions to it, to a different encode type soon.

    @vcWhat NVARCHAR(MAX)
    DECLARE @siPos INT ,@vcEncoded NVARCHAR(9) ,@siChar INT;
    SET @vcResult = RTRIM(LTRIM(CAST(REPLACE(@vcWhat COLLATE Latin1_General_BIN, CHAR(0), '') AS NVARCHAR(MAX))));
    SELECT @vcResult = REPLACE(REPLACE(@vcResult, ' ', ' '), ' ', ' ');
    IF @vcResult = '' RETURN @vcResult;

    declare @s varchar(35);
    declare @n int; set @n = 6;
    declare @i int;

    while @n > 2
        set @s = '';
        set @i=1;
        while @i<=@n
            set @s = @s + '[0-9]';
            set @i = @i + 1;
        set @s = '%&#' + @s + '%';
        SELECT @siPos = PATINDEX(@s, @vcResult);
        WHILE @siPos > 0
            SELECT @vcEncoded = SUBSTRING(@vcResult, @siPos, @n+3)
                ,@siChar = CAST(SUBSTRING(@vcEncoded, 3, @n) AS INT)
                ,@vcResult = REPLACE(@vcResult, @vcEncoded, NCHAR(@siChar))
                ,@siPos = PATINDEX(@s, @vcResult);
        set @n = @n - 1;

	select @vcResult = REPLACE(REPLACE(@vcResult, NCHAR(160), ' '), CHAR(160), ' ');
	select @vcResult = REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(@vcResult, '&', '&'), '"', '"'), '<', '<'), '>', '>'), '&amp;', '&'),'”','”'),'„','„'),'–','–'),'—','—');

	select @vcResult = REPLACE(REPLACE(REPLACE(REPLACE(@vcResult COLLATE Latin1_General_BIN,'Š','Š') COLLATE Latin1_General_BIN,'š','š') COLLATE Latin1_General_BIN,'Ç','Ç') COLLATE Latin1_General_BIN,'ç','ç');
	select @vcResult = REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(@vcResult,'À','À') COLLATE Latin1_General_BIN,'à','à') COLLATE Latin1_General_BIN,'Á','Á') COLLATE Latin1_General_BIN,'á','á') COLLATE Latin1_General_BIN,'Â','Â') COLLATE Latin1_General_BIN,'â','â') COLLATE Latin1_General_BIN,'Ã','Ã') COLLATE Latin1_General_BIN,'ã','ã') COLLATE Latin1_General_BIN,'Ä','Ä') COLLATE Latin1_General_BIN,'ä','ä') COLLATE Latin1_General_BIN,'Å','Å') COLLATE Latin1_General_BIN,'å','å') COLLATE Latin1_General_BIN,'Æ','Æ') COLLATE Latin1_General_BIN,'æ','æ');
	select @vcResult = REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(@vcResult COLLATE Latin1_General_BIN,'È','È') COLLATE Latin1_General_BIN,'è','è') COLLATE Latin1_General_BIN,'É','É') COLLATE Latin1_General_BIN,'é','é') COLLATE Latin1_General_BIN,'Ê','Ê') COLLATE Latin1_General_BIN,'ê','ê') COLLATE Latin1_General_BIN,'Ë','Ë') COLLATE Latin1_General_BIN,'ë','ë');
	select @vcResult = REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(@vcResult COLLATE Latin1_General_BIN,'Ì','Ì') COLLATE Latin1_General_BIN,'ì','ì') COLLATE Latin1_General_BIN,'Í','Í') COLLATE Latin1_General_BIN,'í','í') COLLATE Latin1_General_BIN,'Î','Î') COLLATE Latin1_General_BIN,'î','î') COLLATE Latin1_General_BIN,'Ï','Ï') COLLATE Latin1_General_BIN,'ï','ï');
	select @vcResult = REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(@vcResult COLLATE Latin1_General_BIN,'Ò','Ò') COLLATE Latin1_General_BIN,'ò','ò') COLLATE Latin1_General_BIN,'Ó','Ó') COLLATE Latin1_General_BIN,'ó','ó') COLLATE Latin1_General_BIN,'Ô','Ô') COLLATE Latin1_General_BIN,'ô','ô') COLLATE Latin1_General_BIN,'Õ','Õ') COLLATE Latin1_General_BIN,'õ','õ') COLLATE Latin1_General_BIN,'Ö','Ö') COLLATE Latin1_General_BIN,'ö','ö') COLLATE Latin1_General_BIN,'Ø','Ø') COLLATE Latin1_General_BIN,'ø','ø');
	select @vcResult = REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(@vcResult COLLATE Latin1_General_BIN,'Ù','Ù') COLLATE Latin1_General_BIN,'ù','ù') COLLATE Latin1_General_BIN,'Ú','Ú') COLLATE Latin1_General_BIN,'ú','ú') COLLATE Latin1_General_BIN,'Û','Û') COLLATE Latin1_General_BIN,'û','û') COLLATE Latin1_General_BIN,'Ü','Ü') COLLATE Latin1_General_BIN,'ü','ü');
	select @vcResult = REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(@vcResult COLLATE Latin1_General_BIN,'Ð','Ð') COLLATE Latin1_General_BIN,'ð','ð') COLLATE Latin1_General_BIN,'Ñ','Ñ') COLLATE Latin1_General_BIN,'ñ','ñ') COLLATE Latin1_General_BIN,'Ý','Ý') COLLATE Latin1_General_BIN,'ý','ý') COLLATE Latin1_General_BIN,'Þ','Þ') COLLATE Latin1_General_BIN,'þ','þ') COLLATE Latin1_General_BIN,'ß','ß');

    RETURN @vcResult;

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    Updated: August 7, 2019 15:14