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How to Generate Version 1 UUIDs
Message
De
19/09/2017 05:49:42
 
 
À
19/09/2017 04:18:52
Information générale
Forum:
Visual FoxPro
Catégorie:
Client/serveur
Versions des environnements
Visual FoxPro:
VFP 9 SP2
OS:
Windows 7
Network:
SAMBA Server
Database:
MySQL
Application:
Desktop
Divers
Thread ID:
01654423
Message ID:
01654428
Vues:
68
try UuidCreateSequential () https://msdn.microsoft.com/en-us/library/windows/desktop/aa379322(v=vs.85).aspx


>Hi Experts,
>
>For the longest time, I have been using CoCreateGuid and StringFromGUID2 to generate GUIDs. Problem with this is, whenever one simply does "select * from customer" from a MySQL Server, it does not show the customer rows in its sequential order of creation/insertion. I either need to add a column that is autoinc in nature to enforce sequential behavior.
>
>If one calls or invokes the UUID() of MySQL (or PHP), these GUID values can be spliced and reorganized to make the inserted rows sequential. This is possible due to the fact that the GUIDs they produced are of type "version 1", wherein the 4th and 5th segments are fixed. I won't be needing the added overhead of creating autoinc columns.
>
>This cannot be done however when one uses CoCreateGuid and StringFromGUID2 as the GUIDs they give are of type version 4 - wherein each segment is totally random.
>
>Aside from making a call to a MySQL server, "select uuid()" to populate my primary keys, is there another way to do this "natively"? Needless to say, this will save me a trip to the server.
>
>Thanks In Advance.
Gregory
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