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Problem updating a large binary field (PostgreSQL, ODBC, VC++)

From: pavel_sorokin(at)lycos(dot)com (Pavel Sorokin)
To: "pgsql-general(at)postgresql(dot)org(dot)pgsql-odbc"(at)postgresql(dot)org
Subject: Problem updating a large binary field (PostgreSQL, ODBC, VC++)
Date: 2004-04-20 22:50:56
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-generalpgsql-odbc

I created a table where a record consists of a single field of type
lo. I'm trying to add a new record and store the contents of a file in
it. However, when I call CRecordset.Update() I get the following
exception: "SetPos with data_at_exec not yet supported". My table
doesn't get updated.

Environment: PostgreSQL 7.4.1 on Cygwin, Visual C++ .Net 2003, ODBC
driver 3.520. I pasted my code below (the line that causes the error
is marked). Anyone knows why it doesn't work, and if there's any other
way to do what I want?


CDatabase db;
CMyTable table(&db);
char* FileName		= "c:\\test.txt";
CFile f;
CByteArray ByteArray;

if (f.Open(FileName, CFile::modeRead, &e ))
  CByteArray ByteArray;
  long size = f.GetLength();
  BYTE *p = ByteArray.GetData(); 
  ZeroMemory(p, size); 
  long result = f.Read(p, size);


    table.m_data.m_hData = GlobalAlloc(GMEM_MOVEABLE,size);
    if(table.m_data.m_hData) // GlobalAlloc could return NULL...
	table.m_data.m_dwDataLength = size;
	LPVOID p2 = ::GlobalLock(table.m_data.m_hData);
	memcpy(p2, p, size);
	table.m_data.m_dwDataLength = ::GlobalSize(table.m_data.m_hData);

	// mark the record for the update
	table.SetFieldDirty(&(table.m_data), true);
	table.SetFieldNull(&(table.m_data), false);
        AfxMessageBox("Couldn't allocate memory");

table.Update(); // <-- THIS DOESN'T WORK!

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