MDAC 2.5 SDK - ADO

Resync Method Example (VJ++)

See Also

This example demonstrates using the Resync method to refresh data in a static recordset.

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

public class ResyncX
{
   // The main entry point of the application.
   public static void main (String[] args)
   {
      ResyncX();
      System.exit(0);
   }
   static void ResyncX()
   {
      // Define ADO Objects.
      Recordset rstTitles = null;

      // Declarations.
      BufferedReader in = 
         new BufferedReader(new InputStreamReader(System.in));
      String strCnn = "Provider=sqloledb;Data Source=srv;" +
                  "Initial Catalog=Pubs;User Id=sa;Password=;";

      try
      {
         // Open recordset for Titles table.
         rstTitles = new Recordset();
         rstTitles.setCursorLocation(AdoEnums.CursorLocation.CLIENT);
         rstTitles.setCursorType(AdoEnums.CursorType.STATIC);
         rstTitles.setLockType(AdoEnums.LockType.BATCHOPTIMISTIC);
         rstTitles.open("Titles", strCnn, AdoEnums.CursorType.STATIC, 
            AdoEnums.LockType.BATCHOPTIMISTIC, 
            AdoEnums.CommandType.TABLE);

         // Change the type of the first title in the recordset.
         rstTitles.getField("type").setString("database");

         // Display the results of the change.
         System.out.println("\n\n\tBefore resync:\n" + "\tTitle - " +
            rstTitles.getField("title").getString() +
            "\n\tType  - " + rstTitles.getField("type").getString());

         // Resync with database and redisplay the results.
         rstTitles.resync();
         System.out.println("\n\n\tAfter resync:\n" + "\tTitle - " +
            rstTitles.getField("title").getString() +
            "\n\tType  - " + 
            rstTitles.getField("type").getString()+"\n");
         rstTitles.cancelBatch();

         // Cleanup Objects before exit.
         rstTitles.close();

         System.out.println("\tPress <Enter> to continue..");
         in.readLine();

      }
      catch(AdoException ae)
      {
         // Notify user of any errors that result from ADO.

         // As passing a recordset, check for null pointer first.
         if(rstTitles != null)
         {
            PrintProviderError(rstTitles.getActiveConnection());
         }
         else
         {
            System.out.println("Exception: " + ae.getMessage());
         }
      }
      // System read requires this catch.
      catch(java.io.IOException je)
      {
         PrintIOError(je);
      }
   }

   // PrintProviderError Function

   static void PrintProviderError( Connection Cnn1 )
   {
      // Print Provider errors from Connection object.
      // ErrItem is an item object in the Connection’s 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");
   }
}