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Generating Primary Keys in SQL Server
Message
Information générale
Forum:
Microsoft SQL Server
Catégorie:
Conception bases de données
Divers
Thread ID:
00414202
Message ID:
00473499
Vues:
23
>>As I recall, I set the Transaction Isolation Levl to Repeatable Read (I didn't care about new rows at this point). I then started a transaction and queried the PK table to find the last PK used. Once the row was read, it was locked so no one else could change it. I then updated the PK table using SET PK = @PK + 1 WHERE PK = @PK and commit the transaction. I then set the isolation level back to what it was.
>
>Here's another way to do it:
>
>This assumes that the column nextkey contains the next ID to use.
>
>DECLARE @pk INTEGER
>UPDATE keytable
>SET @pk = nextkey, nextkey = nextkey + 1
>WHERE table = something
>
>This version will assumes that nextkey contains that last ID used. Which means that you have to increment it first. This is not a typo <s>
>
>DECLARE @pk INTEGER
>UPDATE keytable
>SET @pk = nextkey = nextkey + 1
>WHERE table = something
>
>-Mike

Thanks Mike! I will probably be able to use some form of the latter example!
Bill Armbrecht
VFP MCP
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