Hi Zoltan

I have had same problem...
Try to insert guid as char, don’t convert to guid.
INSERT INTO T(G) VALUES('12345678-1234-1234-1234-123456789ABC');

>INSERT INTO T(G) VALUES(CHAR_TO_UUID('12345678-1234-1234-1234-123456789ABC'));

>SELECT UUID_TO_CHAR(G) FROM T;
>Result: '12345678-1234-1234-1234-123456789ABC'

>Result by FB.NET client SELECT G FROM T: (FB.NET handles CHAR(16) OCTETS as 
>Guid)
>'56781234-1234-1234-3412-34127856BC9A'


[PM] as you can se...my problem is the same if I convert to uuid:
String from Membership: d1f5d194-5fa8-4ba1-bcf5-a4a788b58c1a
String from database:           D194D1F5-5FA8-4BA1-F5BC-A7A4B5881A8C

As Jiri said:
Look like Guid in .NET has little bit different text representation than 
uuid_to_char from Firebird. Quaternions are swapped.

BTW I think, that you should compare not strings but the guid values as 
bytes/octets directly.

Best Regards,
Paul




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