유니 코드 (16 진수)에서 varchar로 변환

Question

여기에 문제가 있습니다. 사용하는 시스템은 기본적으로 'Where'절을 생성하고 이미지 형식의 데이터베이스에 저장 한 저장된 검색을 만들 수 있습니다. 변환하려고하는 중입니다. 이미지 항목을 읽을 수있는 형식으로 저장하면 2 가지 형식 (유니 코드 및 비 유니 코드)으로 저장되어 유니 코드 항목이 아닌 항목을 올바르게 표시 할 수 있으며 유니 코드 항목을 변환하려고하면 올바르게 표시되지 않습니다. 제가 변환하는 시도하고 내가 변환 사용하고있는 SQL 코드는 다음

입니다

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

입니다

변환을 수행하는 쿼리의 부분은 내가 17에 시작 인덱스를 설정하고 3000 * 2 (유니 코드 바이트 = 2)로 queryLength을 변경하면 지금이 실제로 그러나, 아무 것도 반환하지 않습니다

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

입니다 get

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

부품을 읽을 수는 있지만 완전한 쿼리는 아니지만 ... 길이를 연장해도 더 이상 나옵니다.

도움을 주시면 감사하겠습니다.

RemoveNonASCII 기능을위한 코드 :

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

좋아, 그래서 나는 .. 반환 된 VARCHAR 문자열의 나머지가 null이 될 원인이 널 (null) 값이 있던 16 진수 문자열 내에서 문제를 발견 그래서 함수를 다음으로 변경했습니다.

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 

0은 ASCII Null 값을 나타냅니다!