在SQL Server 2005的T-SQL Base64编码 [英] Base64 encoding in SQL Server 2005 T-SQL

问题描述

我想编写一个T-SQL查询，我带code字符串为Base64字符串。出人意料的是，我无法找到做Base64编码的任何本地T-SQL函数。难道一个本地函数存​​在吗？如果没有，什么是应该做Base64编码在T-SQL的最佳方式？

I'd like to write a T-SQL query where I encode a string as a Base64 string. Surprisingly, I can't find any native T-SQL functions for doing Base64 encoding. Does a native function exist? If not, what's the best way to do Base64 encoding in T-SQL?

推荐答案

我知道这已经回答了，但我只花了更多的时间比我愿意承认未来与单行的SQL语句来做到这一点，所以我这里会分享的情况下，任何人都需要做相同的：

I know this has already been answered, but I just spent more time than I care to admit coming up with single-line SQL statements to accomplish this, so I'll share them here in case anyone else needs to do the same:

-- Encode the string "TestData" in Base64 to get "VGVzdERhdGE="
SELECT
    CAST(N'' AS XML).value(
          'xs:base64Binary(xs:hexBinary(sql:column("bin")))'
        , 'VARCHAR(MAX)'
    )   Base64Encoding
FROM (
    SELECT CAST('TestData' AS VARBINARY(MAX)) AS bin
) AS bin_sql_server_temp;

-- Decode the Base64-encoded string "VGVzdERhdGE=" to get back "TestData"
SELECT 
    CAST(
        CAST(N'' AS XML).value(
            'xs:base64Binary("VGVzdERhdGE=")'
          , 'VARBINARY(MAX)'
        ) 
        AS VARCHAR(MAX)
    )   ASCIIEncoding
;

我不得不使用子查询生成的表中的第一个（编码）查询，因为我无法找到任何方式对原值（TESTDATA）转换成它的十六进制字符串重新presentation（5465737444617461 ）包括作为参数为xs：）在XQuery语句的hexBinary（

I had to use a subquery-generated table in the first (encoding) query because I couldn't find any way to convert the original value ("TestData") to its hex string representation ("5465737444617461") to include as the argument to xs:hexBinary() in the XQuery statement.

我希望这可以帮助别人！

I hope this helps someone!

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