below is from MSDN,you can find a lot of technical article in MSDN if you search"stored procedure and VC"
good luckSteps To Reproduce Behavior
In the SQL Server 7.0 Query Analyzer select the test database Pubs.
Create the following stored procedure. This stored procedure returns a recordset and an out parameter count.if exists (select * from sysobjects where id = object_id(N'[dbo].[GetJobs]') and OBJECTPROPERTY(id, N'IsProcedure') = 1)
drop proc GetJobs
go
create proc GetJobs @id as int, @count as int [out] as
begin
Select @count = Count(*) from jobs where job_id >@id
Select * from jobs where job_id >@id
end
go
Use VC App Wizard to create a new console application and modify the code as follows:#include "stdafx.h"
#include "stdio.h"
#import "C:\PROGRA~1\COMMON~1\System\ado\msado15.dll" no_namespace rename ("EOF", "EOF2") struct InitOle {
InitOle() { ::CoInitialize(NULL); }
~InitOle() { ::CoUninitialize(); }
} _init_InitOle_; int main(int argc, char* argv[])
{
_variant_t varErr((long)0, VT_ERROR);
_CommandPtr comm(__uuidof(Command));
_ConnectionPtr conn(__uuidof(Connection)); _bstr_t connstr="Provider=SQLOLEDB.1;Persist Security Info=False;User ID=sa;Initial Catalog=pubs;Data Source=(local)";
conn->Open(connstr, "", "", adConnectUnspecified);
comm->ActiveConnection=conn;
comm->CommandText="GetJobs";
comm->CommandType = adCmdStoredProc ;
comm->Parameters->Refresh();
_variant_t recs; comm->Parameters->Item[_variant_t((short)1)]->Value= _variant_t((long)5);
_RecordsetPtr rs = comm->Execute(&recs, &vtMissing,adCmdStoredProc); _variant_t recordcount= comm->Parameters->Item[_variant_t((short)2)]->Value; printf("recordcount = %li\n", (long)recordcount);
return 0;
}
Change the Datasource, User ID and password in the connection string above.
The recordcount variant that the above code returns is of type VT_NULL rather than the number of records that the stored procedure returns.
good luckSteps To Reproduce Behavior
In the SQL Server 7.0 Query Analyzer select the test database Pubs.
Create the following stored procedure. This stored procedure returns a recordset and an out parameter count.if exists (select * from sysobjects where id = object_id(N'[dbo].[GetJobs]') and OBJECTPROPERTY(id, N'IsProcedure') = 1)
drop proc GetJobs
go
create proc GetJobs @id as int, @count as int [out] as
begin
Select @count = Count(*) from jobs where job_id >@id
Select * from jobs where job_id >@id
end
go
Use VC App Wizard to create a new console application and modify the code as follows:#include "stdafx.h"
#include "stdio.h"
#import "C:\PROGRA~1\COMMON~1\System\ado\msado15.dll" no_namespace rename ("EOF", "EOF2") struct InitOle {
InitOle() { ::CoInitialize(NULL); }
~InitOle() { ::CoUninitialize(); }
} _init_InitOle_; int main(int argc, char* argv[])
{
_variant_t varErr((long)0, VT_ERROR);
_CommandPtr comm(__uuidof(Command));
_ConnectionPtr conn(__uuidof(Connection)); _bstr_t connstr="Provider=SQLOLEDB.1;Persist Security Info=False;User ID=sa;Initial Catalog=pubs;Data Source=(local)";
conn->Open(connstr, "", "", adConnectUnspecified);
comm->ActiveConnection=conn;
comm->CommandText="GetJobs";
comm->CommandType = adCmdStoredProc ;
comm->Parameters->Refresh();
_variant_t recs; comm->Parameters->Item[_variant_t((short)1)]->Value= _variant_t((long)5);
_RecordsetPtr rs = comm->Execute(&recs, &vtMissing,adCmdStoredProc); _variant_t recordcount= comm->Parameters->Item[_variant_t((short)2)]->Value; printf("recordcount = %li\n", (long)recordcount);
return 0;
}
Change the Datasource, User ID and password in the connection string above.
The recordcount variant that the above code returns is of type VT_NULL rather than the number of records that the stored procedure returns.
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