varbinary to string on SQL Server

问题

How to convert a column value from varbinary(max) to varchar in human-readable form?

回答1:

"Converting a varbinary to a varchar" can mean different things.

If the varbinary is the binary representation of a string in SQL Server (for example returned by casting to varbinary directly or from the DecryptByPassPhrase or DECOMPRESS functions) you can just CAST it

declare @b varbinary(max)
set @b = 0x5468697320697320612074657374

select cast(@b as varchar(max)) /*Returns "This is a test"*/

This is the equivalent of using CONVERT with a style parameter of 0.

CONVERT(varchar(max), @b, 0)

Other style parameters are available with CONVERT for different requirements as noted in other answers.

回答2:

The following expression worked for me:

SELECT CONVERT(VARCHAR(1000), varbinary_value, 2);

Here are more details on the choice of style (the third parameter).

回答3:

Actually the best answer is

SELECT CONVERT(VARCHAR(1000), varbinary_value, 1);

using "2" cuts off the "0x" at the start of the varbinary.

回答4:

Try this

SELECT CONVERT(varchar(5000), yourvarbincolumn, 0)

回答5:

For a VARBINARY(MAX) column, I had to use NVARCHAR(MAX):

cast(Content as nvarchar(max))

Or

CONVERT(NVARCHAR(MAX), Content, 0)
VARCHAR(MAX) didn't show the entire value

回答6:

I tried this, it worked for me:

declare @b2 VARBINARY(MAX) 
set @b2 = 0x54006800690073002000690073002000610020007400650073007400
SELECT CONVERT(nVARCHAR(1000), @b2, 0);

来源：https://stackoverflow.com/questions/3289988/varbinary-to-string-on-sql-server