zjs wrote:
Quote:
for example
I can solve it in a single user.
_RecordsetPtr pR;
pConnection->Execute("Insert into TTest(nTest)
VALUES(100)"),&recordAffect,adCmdText);
pConnection->Execute("Select SCOPE_IDENTITY AS 'ID'
"),&recordAffect,adCmdText);
_variant_t vIndex = (LONG)0;
_variant_t vCount = pR->GetCollect("ID");
>
I get the identity in "vCount" successful.
but in multiusers. what should I do???any good advice?
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Not really a C++ question, but...
The solution is to perform both the insert and the retreival of
scope_identity in a single batch (i.e. present SQL server with both pieces
of text - the insert and the select - in a single call to Execute). You
could also make a stored proc in your database that does the insert followed
by the select and invoke that from your C++ code. Many database designers
would argue that that's the "correct" way.
See
http://msdn.microsoft.com/en-us/library/ms190315.aspx for details on
SCOPE_IDENTITY.
-cd
