MDAC 2.5 SDK - ADO

NextRecordset Method Example (VJ++)

See Also

This example uses the NextRecordset method to view the data in a recordset that uses a compound command statement made up of three separate SELECT statements.

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

public class NextRecordsetX
{
// The main entry point for the application.

public static void main (String[] args)
{
   NextRecordsetX();
   System.exit(0);

}
// NextRecordsetX Function
static void NextRecordsetX()
{
   // Define ADO Object
   Recordset rstCompound = null;

   // Declarations
   BufferedReader in = 
      new BufferedReader(new InputStreamReader(System.in));
   String strCnn;
   int intCount;
   int intDisplayRecords = 15;
   int intRecordCount;

   try
   {
      // Open compound recordset.
      strCnn = "Provider=sqloledb;Data Source=srv;" +
          "Initial Catalog=Pubs;User Id=sa;Password=;";

      rstCompound = new Recordset();
      rstCompound.open("select * from Authors;" +
          "select * from stores;" +
          "select * from jobs", strCnn, AdoEnums.CursorType.FORWARDONLY, 
         AdoEnums.LockType.READONLY,AdoEnums.CommandType.TEXT);

      // Display results from each select statement.
      intCount=1;

         while (rstCompound != null)
         {
            System.out.println(
               "Contents of recordset #" + intCount + "\n");
            intRecordCount = 0;
            while(rstCompound.getEOF() != true )
               {
                  System.out.println(
                     rstCompound.getField(0).getString()+" " + 
                     rstCompound.getField(1).getString());
                  intRecordCount++;
                  if ( intRecordCount == intDisplayRecords)
                  {
                     System.out.println("\nPress <Enter> to continue..");
                     in.readLine();
                     intRecordCount = 0;
                  }
                  rstCompound.moveNext();
               }
            System.out.println("\nPress <Enter> to continue..");
            in.readLine();

            rstCompound = rstCompound.nextRecordset();

            intCount++;
         }
   }
   // System read requires this catch.
   catch(java.io.IOException je)
   {
      PrintIOError(je);
   }
   catch(AdoException ae)
   {
      // Notify the user of any errors that result from ADO.

      // As passing a recordset. check for the null pointer first
      if(rstCompound!=null)
      {
         PrintProviderError(rstCompound.getActiveConnection());
      }
      else
      {
         System.out.println("Exception: " + ae.getMessage());
      }
   }
   catch(java.lang.NullPointerException ne)
   {
      System.out.println("Error Description: " + ne.getMessage());
   }

}

   // 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");
   }
}