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CRecordset "Invalid Descriptor Index "

Posted on 2014-04-15
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Last Modified: 2014-04-22
Hi all,

Here's my code:

SQL = SELECT ID,X,Y,A,TYPEID, vid  FROM (SELECT ID,A,X,Y,TYPEID,  (SELECT TOP 1 ID FROM DETAILS d WHERE pos.ID = d.ID) AS vid, row_number() over (partition by ID order by CREATEDTIME desc) as rn FROM POST pos) AS ss WHERE rn = 1;

CDatabase* pDatabase = new CDatabase();
pDatabase->Open(_T(""),FALSE,FALSE,LPCTSTR(sDsn));
CRecordset rs( pDatabase );
rs.m_bUseODBCCursorLib = TRUE;
BOOL iReturn = rs.Open(SQL ,CRecordset::forwardOnly,CRecordset::readOnly);
while(!rs.IsEOF() )
{
    CDBVariant v;
    memset(&v,0,sizeof(CDBVariant));
            
  rs.GetFieldValue((short)0, v, SQL_C_SLONG);
   //always the ERROR here
}

I searched high and low, but so far unable to solve this.

Maybe there's something wrong with my SQL? But
this only happens on SQLServer (I tried different databases on different versions).
Works fine in DB2.

Please help.
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Question by:trustworthy
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LVL 86

Expert Comment

by:jkr
ID: 40002070
Is that really your actual code? I am asking because

BOOL iReturn = rs.Open(SQL ,CRecordset::forwardOnly,CRecordset::readOnly);

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really seems wrong, all versions of 'CRecordset::Open()' take 'nOpenType' as their 1st parameter and the SQL statement as the 2nd, see the docs at http://msdn.microsoft.com/en-us/library/1hkkwdf0%28v=vs.120%29.aspx

Also, what is the return value? Are you checking that one before calling 'GetFieldValue()'?
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Author Comment

by:trustworthy
ID: 40002149
You're right, I copied the wrong statement, it is:

rs.Open(CRecordset::forwardOnly,sp_text,CRecordset::readOnly);

And yes, I do check the return value, and I see number of records returned in the rs properties.
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LVL 86

Expert Comment

by:jkr
ID: 40003107
OK, and when you open the Data Set Visualizer in VS (just hover over the record set in the debugger and click on the magnifier symbol), do you get the results that you expected n terms of that query?
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Author Comment

by:trustworthy
ID: 40003726
Yes, exactly what is expected. Same number of rows if I run the same query in any SQL program.
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Accepted Solution

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trustworthy earned 0 total points
ID: 40007642
I can't figure this out, so I decided not to use CRecordset at all
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Author Closing Comment

by:trustworthy
ID: 40014367
Bo other solution
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