sql - 如何从SQL Server中的VARCHAR()中删除尾随CHAR(0)？

在microsoft sql server中，我试图通过将varchar()存储到上下文信息来将varbinary()字符串传递给触发器。
通过CONTEXT_INFO本身传递数据不是问题。
我的问题是，我必须将avarchar()转换为varbinary()才能将数据传递到上下文信息，而convert back tovarchar()会产生一个后续的CHAR(0)字符，我无法再正确处理这些字符。
我试图找到CHAR(0)的第一个索引，将其子字符串转换为新的正确字符串，但没有成功。另外，其他内置函数无法正确处理CHAR(0)字符。
但是：
LEN()=>始终返回128，
CHARINDEX()=>找不到CHAR(0)，
RTRIM()=>不修剪不可打印的字符，
CHAR(0)=>不能替换REPLACE()，
执行时出现异常：

SELECT * FROM (SELECT (@textbin) AS [blabla]) AS [result] FOR XML

特别地，我需要传递的字符串，作为纯文本，没有尾随空格/char（0）来将字符串放入xml。
注：XML中的二进制base64表示不是我可以使用的选项！
这里是一个测试sql脚本

DECLARE @text VARCHAR(128)
DECLARE @bintext BINARY(128)
DECLARE @textbin VARCHAR(128)

SET @text = 'test'
--SET @text = 'test' + CHAR(0)
--SET @text = 'test' + CHAR(0) + CHAR(1)
SET @bintext = CONVERT(BINARY(128), @text)
SET @textbin = CONVERT(VARCHAR(128), @bintext)

SET CONTEXT_INFO @bintext
SET @textbin = CAST(CONTEXT_INFO() AS VARCHAR(128))

SELECT
    @text AS [content], LEN(@text) AS [len], DATALENGTH(@text) AS [datalength]
    , REVERSE(@text) AS [reverse]
    , LEN(RTRIM(@text)) AS [len_rtrim]
    , CHARINDEX(CHAR(0), @text) AS [charindex]
    , (SELECT * FROM (SELECT @text AS [text]) AS [result] FOR XML AUTO, BINARY BASE64) AS [xml]
SELECT
    @bintext AS [content], LEN(@bintext) AS [len], DATALENGTH(@bintext) AS [datalength]
    , REVERSE(@bintext) AS [reverse]
    , CHARINDEX(CHAR(0), @bintext) AS [charindex]
    , (SELECT * FROM (SELECT @bintext AS [bintext]) AS [result] FOR XML AUTO, BINARY BASE64) AS [xml]
SELECT
    @textbin AS [content], LEN(@textbin) AS [len], DATALENGTH(@textbin) AS [datalength]
    , REVERSE(@textbin) AS [reverse]
    , LEN(LTRIM(@textbin)) AS [len_rtrim]
    , CHARINDEX(CHAR(0), @textbin) AS [charindex]
    , (SELECT * FROM (SELECT REPLACE(@textbin, CHAR(0), '?') AS [textbin]) AS [result] FOR XML AUTO, BINARY BASE64) AS [xml]

IF @textbin = @text
    SELECT '(@textbin = @text) => TRUE' AS [if]
ELSE
    SELECT '(@textbin = @text) => FALSE' AS [if]

IF @textbin = 'test'
    SELECT '(@textbin = ''test'') => TRUE' AS [if]
ELSE
    SELECT '(@textbin = ''test'') => FALSE' AS [if]

IF @textbin = 'test' + CHAR(0) + CHAR(1)
    SELECT '(@textbin = ''test'' + CHAR(0) + CHAR(1)) => TRUE' AS [if]
ELSE
    SELECT '(@textbin = ''test'' + CHAR(0) + CHAR(1)) => FALSE' AS [if]

IF @textbin LIKE 'test'
    SELECT '(@textbin LIKE ''test'') => TRUE' AS [if]
ELSE
    SELECT '(@textbin LIKE ''test'') => FALSE' AS [if]

IF @textbin LIKE 'test%'
    SELECT '(@textbin LIKE ''test%'') => TRUE' AS [if]
ELSE
    SELECT '(@textbin LIKE ''test%'') => FALSE' AS [if]

SELECT * FROM (SELECT (@textbin) AS [context_info]) AS [test] FOR XML AUTO, BINARY BASE64
-- SELECT * FROM (SELECT (@textbin) AS [context_info]) AS [test] FOR XML AUTO, TYPE, BINARY BASE64
-- SELECT * FROM (SELECT (@textbin) AS [context_info]) AS [test] FOR XML AUTO

-- relatet to "@textbin"
-- LEN() => returns always 128,
-- CHARINDEX() => does not find CHAR(0),
-- RTRIM() => does not trim non printable CHAR(0) chars,
-- REPLACE() => does not replace CHAR(0),
-- exception on executing: SELECT * FROM (SELECT (@textbin) AS [context_info]) AS [test] FOR XML AUTO, TYPE, BINARY BASE64
-- exception on executing: SELECT * FROM (SELECT (@textbin) AS [context_info]) AS [test] FOR XML AUTO

最佳答案

达尔卡注意到，
这是问题的副本：
What is the Null Character literal in TSQL?
…谢谢你给我看。
此更改修复了我的代码：

SET @textbin = REPLACE(CAST(CAST(CONTEXT_INFO() AS VARCHAR(128)) COLLATE SQL_Latin1_General_CP1_CI_AS AS VARCHAR(128)), CHAR(0), '')