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.
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)
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
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))
SELECT CONVERT(uniqueidentifier,STUFF(STUFF(STUFF(STUFF('B33D42A3AC5A4D4C81DD72F3D5C49025',9,0,'-'),14,0,'-'),19,0,'-'),24,0,'-'))
选择演员表(CAST('A89B1ACD-9501-6AE6-B9C8-AABB07DA2010' as char(36)) 作为唯一标识符)
如果您的字符串包含特殊字符,则可以将其哈希到md5,然后将其转换为guid / uniqueidentifier。
SELECT CONVERT(UNIQUEIDENTIFIER, HASHBYTES('MD5','~öü߀a89b1acd95016ae6b9c8aabb07da2010'))
The guid provided is not correct format(.net Provided guid).
begin try
select convert(uniqueidentifier,'a89b1acd95016ae6b9c8aabb07da2010')
end try
begin catch
print '1'
end catch
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