CODEWITHSUNDEEP
sqlsql-server-2005uniqueidentifier
grenade
grenade

Reputation: 32179

Convert varchar to uniqueidentifier in SQL Server

A table I have no control of the schema for, contains a column defined as varchar(50) which stores uniqueidentifiers in the format 'a89b1acd95016ae6b9c8aabb07da2010' (no hyphens)

I want to convert these to uniqueidentifiers in SQL for passing to a .Net GUID. However, the following query lines don't work for me:

select cast('a89b1acd95016ae6b9c8aabb07da2010' as uniqueidentifier)
select convert(uniqueidentifier, 'a89b1acd95016ae6b9c8aabb07da2010')

and result in:

Msg 8169, Level 16, State 2, Line 1
Conversion failed when converting from a character string to uniqueidentifier.

The same queries using a hyphenated uniqueidentifier work fine but the data is not stored in that format.

Is there another (efficient) way to convert these strings to uniqueidentifiers in SQL. -- I don't want to do it in the .Net code.

Upvotes: 135

Views: 366611

Answers (7)

ZenoArrow
ZenoArrow

Reputation: 784

I don't know how new a version of SQL Server you'd need for the following to work, but in current versions you can do the following...

DECLARE @myid uniqueidentifier ;  
SET @myid = 'A972C577-DFB0-064E-1189-0154C99310DAAC12';

This example is taken from Microsoft's documentation: https://learn.microsoft.com/en-us/sql/t-sql/functions/newid-transact-sql?view=sql-server-ver16

Upvotes: 2

mccrhodes
mccrhodes

Reputation: 31

SELECT CAST(CAST('A89B1ACD-9501-6AE6-B9C8-AABB07DA2010' as char(36)) as uniqueidentifier)

Upvotes: 3

Hafthor
Hafthor

Reputation: 16896

It would make for a handy function. Also, note I'm using STUFF instead of SUBSTRING.

create function str2uniq(@s varchar(50)) returns uniqueidentifier as begin
    -- just in case it came in with 0x prefix or dashes...
    set @s = replace(replace(@s,'0x',''),'-','')
    -- inject dashes in the right places
    set @s = stuff(stuff(stuff(stuff(@s,21,0,'-'),17,0,'-'),13,0,'-'),9,0,'-')
    return cast(@s as uniqueidentifier)
end

or a one-liner:

cast(stuff(stuff(stuff(stuff(replace(replace(@s,'0x',''),'-',''),21,0,'-'),17,0,'-'),13,0,'-'),9,0,'-') as uniqueidentifier)

Upvotes: 32

user3082965
user3082965

Reputation: 1

The guid provided is not correct format(.net Provided guid).

begin try
select convert(uniqueidentifier,'a89b1acd95016ae6b9c8aabb07da2010')
end try
begin catch
print '1'
end catch

Upvotes: -7

Matthew
Matthew

Reputation: 231

SELECT CONVERT(uniqueidentifier,STUFF(STUFF(STUFF(STUFF('B33D42A3AC5A4D4C81DD72F3D5C49025',9,0,'-'),14,0,'-'),19,0,'-'),24,0,'-'))

Upvotes: 19

manji
manji

Reputation: 47978

your varchar col C:

SELECT CONVERT(uniqueidentifier,LEFT(C, 8)
                                + '-' +RIGHT(LEFT(C, 12), 4)
                                + '-' +RIGHT(LEFT(C, 16), 4)
                                + '-' +RIGHT(LEFT(C, 20), 4)
                                + '-' +RIGHT(C, 12))

Upvotes: 21

Quassnoi
Quassnoi

Reputation: 425321

DECLARE @uuid VARCHAR(50)
SET @uuid = 'a89b1acd95016ae6b9c8aabb07da2010'
SELECT  CAST(
        SUBSTRING(@uuid, 1, 8) + '-' + SUBSTRING(@uuid, 9, 4) + '-' + SUBSTRING(@uuid, 13, 4) + '-' +
        SUBSTRING(@uuid, 17, 4) + '-' + SUBSTRING(@uuid, 21, 12)
        AS UNIQUEIDENTIFIER)

Upvotes: 153

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