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Creating Excel Sheets using ODBC

, 12 Jan 2000
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Writing to Excel spreadsheets using only ODBC
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The Problem

Many apps offer an export function. So wouldn´t it be nice to be able to easily save that result as an Excel sheet?

ODBC does make this possible, but there´s one little drawback: Using ODBC the usual way there has to be a registered datasource (DSN) in the ODBC manager.

This is not very useful because you´d have to install that DSN locally on every machine that should support your export function.

The Solution

Omiting the DSN tag in the connect string of CDatabase::OpenEx() gives us the opportunity to refer the ODBC-Driver directly using its name so we don´t have to have a DSN registered. This, of course, implies that the name of the ODBC-Driver is exactly known.

If you just want to test if a certain driver is present (to show the supported extensions in the CFileOpenDlg for example) just try to CDatabase::OpenEx() it. If it isn´t installed an exception gets thrown.

To create and write to that Excel sheet you simply use SQL as shown in the code sample below.

What is Needed

In order to get the code below going you have to

  • have included
  • have an installed ODBC-driver called "MICROSOFT EXCEL DRIVER (*.XLS)"

The Source code

// this example creates the Excel file C:\DEMO.XLS, puts in a worksheet with two
// columns (one text the other numeric) an appends three no-sense records.   
//  
void MyDemo::Put2Excel()
{
  CDatabase database;
  CString sDriver = "MICROSOFT EXCEL DRIVER (*.XLS)"; // exactly the same name as in the ODBC-Manager
  CString sExcelFile = "c:\\demo.xls";                // Filename and path for the file to be created
  CString sSql;
    
  TRY
  {
    // Build the creation string for access without DSN
       
    sSql.Format("DRIVER={%s};DSN='';FIRSTROWHASNAMES=1;READONLY=FALSE;CREATE_DB=\"%s\";DBQ=%s",
                sDriver, sExcelFile, sExcelFile);

    // Create the database (i.e. Excel sheet)
    if( database.OpenEx(sSql,CDatabase::noOdbcDialog) )
    {
      // Create table structure
      sSql = "CREATE TABLE demo (Name TEXT,Age NUMBER)";
      database.ExecuteSQL(sSql);

      // Insert data
      sSql = "INSERT INTO demo (Name,Age) VALUES ('Bruno Brutalinsky',45)";
      database.ExecuteSQL(sSql);

      sSql = "INSERT INTO demo (Name,Age) VALUES ('Fritz Pappenheimer',30)";
      database.ExecuteSQL(sSql);

      sSql = "INSERT INTO demo (Name,Age) VALUES ('Hella Wahnsinn',28)";
      database.ExecuteSQL(sSql);
    }      

    // Close database
    database.Close();
  }
  CATCH_ALL(e)
  {
    TRACE1("Driver not installed: %s",sDriver);
  }
  END_CATCH_ALL;
}

License

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Comments and Discussions

 
Generalgood thank u Pinmembervikas amin23-Aug-05 21:31 
Questionhow to insert more than one table in same sheet Pinsussshsak6-May-04 22:49 
AnswerRe: how to insert more than one table in same sheet Pinmemberphucid9-Oct-05 17:06 
Questionchange font style and colors in spreadsheet? Pinsussxxhimanshu23-Feb-04 19:11 
GeneralWorks, but why not this?: Pinmemberkleinb21-Apr-03 20:33 
GeneralRe: Works, but why not this?: Pinmemberpolofreak7-Jun-05 23:46 
GeneralODBC excel driver PinsussGianluca Nastasi23-Mar-03 23:25 
GeneralRe: ODBC excel driver PinmemberHerschel S. Krustofsky11-Apr-03 8:55 
Start odbcad32.exe to check what ODBC drivers are installed.
The ODBC Excel driver is part of the Excel Installation.
 

GeneralPlain C Version Available PinsussAnonymous19-Feb-03 4:08 
GeneralRe: Plain C Version Available PinmemberBilloKhan18-Nov-05 15:34 
GeneralRe: Plain C Version Available Pinmemberliaohaiwen10-Apr-08 19:10 
GeneralStoring date and time values in Excel using ODBC PinmemberKlaus Kurt9-Jan-03 5:41 
Generalsingle quote mark PinmemberMartin Step9-Jul-02 23:34 
GeneralRe: single quote mark Pinmemberoneleg14-Mar-05 1:46 
Generaloverwriting cells in existing table PinmemberAnonymous26-Jun-02 1:26 
GeneralRe: overwriting cells in existing table PinmemberObliterator11-Jul-02 3:31 
Generalexcel template PinmemberJohnny007_24/710-Jun-02 7:49 
General... PinmemberAnonymous10-Jun-02 7:19 

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