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Provider and DefaultDatabase Properties Example (VJ++)

This example demonstrates the Provider property by opening three Connection objects using different providers. It also uses the DefaultDatabase property to set the default database for the Microsoft ODBC Provider.

// BeginProviderJ
import java.io.*;
import com.ms.wfc.data.*;

public class ProviderX
{
   //    The main entry point of the application.
   public static void main (String[] args)
   {
      ProviderX();
      System.exit(0);
   }
   // ProviderX Function
   static void ProviderX()
   {
      // Define ADO Objects.
      Connection cnn1 = null;
      Connection cnn2 = null;
      Connection cnn3 = null;

      // Declarations.
      BufferedReader in = 
         new BufferedReader(new InputStreamReader(System.in));
      try
      {
         // Open a connection using the Microsoft ODBC Provider.
         cnn1 = new Connection();
         cnn1.setConnectionString("driver={SQL Server};"+
             "server='MySqlServer';User ID='MyUserID';Password='MyPassword';");
         cnn1.open();
         cnn1.setDefaultDatabase("Pubs");

         // Display the provider.
         System.out.println("\n\n\tCnn1 provider: "+ cnn1.getProvider());

         // Open connection using the OLE DB Provider for Microsoft Jet.
         cnn2 = new Connection();
         cnn2.setProvider("Microsoft.Jet.OLEDB.4.0");
         cnn2.open("Northwind.mdb","admin","");

         // Display the provider.
         System.out.println("\n\n\tCnn2 provider: " + 
            cnn2.getProvider());

         // Open a connection using the Microsoft SQL Server Provider.
         cnn3 = new Connection();
         cnn3.setProvider("sqloledb");
         cnn3.open("Data Source='MySqlServer';Initial Catalog='Pubs';Integrated Security='SSPI';","","");

         // Display the provider.
         System.out.println("\n\n\tCnn3 provider: " + 
            cnn3.getProvider());

         System.out.println("\n\n\tPress <Enter> to continue..");
         in.readLine();
      }
      catch(AdoException ae)
      {
         // Notify the user of any errors that result from ADO.

         // As passing a Connection, check for null pointer first.
         if(cnn1 != null)
         {
            PrintProviderError(cnn1);
         }
         else
         {
            System.out.println("Exception: " + ae.getLocalizedMessage());
         }
      }
      // System read requires needs this catch.
      catch(java.io.IOException je)
      {
         PrintIOError(je);
      }   
      
      finally
      {
         // Cleanup objects before exit.   
         if (cnn1 != null)
            if (cnn1.getState() == 1)
               cnn1.close();   
         if (cnn2 != null)
            if (cnn2.getState() == 1)
               cnn2.close();   
         if (cnn3 != null)
            if (cnn3.getState() == 1)
               cnn3.close();
      }
   }
   // PrintProviderError Function

   static void PrintProviderError( Connection Cnn1 )
   {
      // Print Provider errors from Connection object.
      // ErrItem is an item object in the Connections Errors collection.
      com.ms.wfc.data.Error  ErrItem = null;
      long nCount = 0;
      int  i      = 0;

      nCount = Cnn1.getErrors().getCount();

      // If there are any errors in the collection, print them.
      if( nCount > 0);
      {
         // Collection ranges from 0 to nCount - 1
         for (i = 0; i< nCount; i++)
         {
            ErrItem = Cnn1.getErrors().getItem(i);
            System.out.println("\t Error number: " + ErrItem.getNumber()
               + "\t" + ErrItem.getDescription() );
         }
      }

   }

   // PrintIOError Function

   static void PrintIOError( java.io.IOException je)
   {
      System.out.println("Error \n");
      System.out.println("\tSource = " + je.getClass() + "\n");
      System.out.println("\tDescription = " + je.getMessage() + "\n");
   }
}
// EndProviderJ

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