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Action 'Execute_stored_procedure_(V2)' failed due to the SQL conversion from a character string to uniqueidentifier

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Posted on by Zhangzhonghao

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I have a stored procedure, which accepts a parameter. The parameter's type is an uniqueidentifier. I've pass the correct format, why did it always failed with the error conversion failure? Anyone can help!!!

{

"status": 400,

"message": "Microsoft SQL: Conversion failed when converting from a character string to uniqueidentifier.\r\n inner exception: Microsoft SQL: Conversion failed when converting from a character string to uniqueidentifier.\r\nclientRequestId: a866fd12-c4cf-4f04-b203-e86de3ee59c8",

"error": {

"source": "sql-ea.azconn-ea.p.azurewebsites.net"

}

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Pstork1 68,697 Most Valuable Professional on at

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Unique Identifiers are GUIDs, not strings, and there is no automatic conversion. Try using GUID() to cast the string to a GUID and use that for your parameter.

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Zhangzhonghao 126 on at

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Hi @Pstork1 , thanks for your replying! I just tried to use guid() function to convert, but it still failed. Any idea for this?

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Pstork1 68,697 Most Valuable Professional on at

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First, my apologies. I should read documentation more closely. You can't use Guid() to cast a string to a guid. It always produces a new guid. But I did go back and try your scenario. SQL should accept a straight string in the right format as a guid. Can you share how the parameter is defined in the stored procedure and what you are using it for? I built a simple table with a uniqueIdentifier as a Key and then executed the following stored procedure feeding the Guid in as a string. It works.

ALTER PROCEDURE [dbo].[selectbyGuid] @GuidId UNIQUEIDENTIFIER AS BEGIN -- SET NOCOUNT ON added to prevent extra result sets from -- interfering with SELECT statements. SET NOCOUNT ON -- Insert statements for procedure here SELECT FieldA,FieldB from dbo.SQL Where Id = @GuidId END

I also ran it with the GUID you are using and it worked correctly. No data was returned but it did accept the GUID as a valid parameter.

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Zhangzhonghao 126 on at

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@Pstork1 thanks for your solution! It turned out that we have incorrect type define of UNIQUEIDENTIFIER (We defined it varchar)...

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