poor performance by writing data via ODBC into a csv file 
Author Message
 poor performance by writing data via ODBC into a csv file

Hi all,

i had to export data via ODBC as csv file, but the performance is very bad !?!?

I created a little sample to test this performance problem in a
easy to use environment. Every call to ExecuteSQL() takes some
time to return. So inserting 10 rows takes about 10 seconds.
(Microsoft Text Driver 4.00.5303.01)

When i use the excel driver, it takes nor more than a second
to export all 10 rows into an xls file.

What is wrong using the csv driver this way ?

Thanks Thomas

#include "stdafx.h"
#include <afxdb.h>

CWinApp theApp;
CDatabase db;
using namespace std;

void exec(LPCTSTR  strSQL)
    catch(CDBException *e)
        cerr << _T("ExecuteSQL Error: ") << e->m_nRetCode << _T("  ") <<
e->m_strError.GetBuffer(0) << endl;


int _tmain(int argc, TCHAR* argv[], TCHAR* envp[])
    int nRetCode = 0;

    // !!! 'export-csv' must exist as 'Microsoft Text Driver (*.txt; *.csv)'
data source
    if (db.OpenEx("ODBC;DBQ=;DSN=export-csv"))
    // if (db.OpenEx("ODBC;DBQ=test.xls;DSN=export-xls"))
        int nRows = 10;

        exec("DROP TABLE [test.csv]");
        exec("CREATE TABLE [test.csv] ([Name] CHAR (40))");

        while (nRows--)
            exec("INSERT INTO [test.csv] VALUES ('Name 1')");
    return nRetCode;



Tue, 04 May 2004 19:12:19 GMT
 [ 1 post ] 

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