Unicode（16進）からvarcharへの変換

Question

ここで問題があります。私が使用するシステムでは、基本的に 'Where'節が生成され、タイプImageとしてデータベースに保存されます。 私は、画像の入力が可能な形式になっていれば、2つの形式（Unicodeと非Unicode）で保存され、Unicode以外の項目を正しく表示でき、正しく表示されます。ただし、Unicodeの項目を変換しようとすると正しく表示されません。私が変換しようとしていることは、私が変換するのに使用していますSQLコードは、以下の

です

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

です

変換を行い、クエリの一部は、私が17にのstartIndexを設定し、3000 * 2（Unicodeのバイト= 2）IにqueryLengthを変更した場合、今、これは実際にはしかし、何も返さない

when 1 then [Production_ED].dbo.[RemoveNonASCII] 
(cast(cast(substring(sql_tree_binary, startIndex, queryLength * 2) as 
nvarchar(max))as varchar(max))) 

ですget

??Quote?????Norgren_Group Id = 0x0000000000000023???A??????????????? ????????????? ??????????????????????? ? ??????????????????????????????A?????????? ? ???A??Aa??TTID_25R12454.TTID_23R864R12454 __SQ 

返されましたが、私は部分を読み取ることができますが、それは完全なクエリではありません...私はもはや長さを延長します。

ご協力いただければ幸いです。

RemoveNonASCII関数のコード：

ALTER FUNCTION [dbo].[RemoveNonASCII] 
(
@nstring nvarchar(max) 
) 
RETURNS varchar(max) 
AS 
BEGIN 

DECLARE @Result varchar(max) 
SET @Result = '' 

DECLARE @nchar nvarchar(1) 
DECLARE @position int 

SET @position = 1 
WHILE @position <= LEN(@nstring) 
BEGIN 
    SET @nchar = SUBSTRING(@nstring, @position, 1) 
    IF ASCII(@nchar) between 32 and 255 
     SET @Result = @Result + @nchar 
    SET @position = @position + 1 
END 

RETURN @Result 

END 

GO 

Answer 1

[OK]を、ので、私は..返さvarchar型の文字列の残りの部分はヌルになった原因null値、あった16進数文字列内で、問題を発見したので、I関数を次のように変更しました：

AS 
BEGIN 

DECLARE @Result varchar(max) 
SET @Result = '' 

DECLARE @nchar nvarchar(1) 
DECLARE @position int 

SET @position = 1 
WHILE @position <= LEN(@nstring) 
BEGIN 
    SET @nchar = SUBSTRING(@nstring, @position, 1) 
    IF ASCII(@nchar) between 1 and 125 
     SET @Result = @Result + @nchar 
    SET @position = @position + 1 
END 

RETURN @Result 

END 

0をASCII Null値に捨ててください！