AbsolutePage, PageCount, and PageSize Properties Example (VJ++)

 

This example uses the AbsolutePage, PageCount, and PageSize properties to display names and hire dates from the Employees table, five records at a time.

// BeginAbsolutePageJ
// The WFC class includes the ADO objects.

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

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

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

   // AbsolutePageX function

   static void AbsolutePageX()
   {
      // Define ADO Objects.
      Recordset rstEmployees = null;

      // Declarations.
      BufferedReader in = new BufferedReader (new 
         InputStreamReader(System.in));
      String line = null;
      String strCnn = "Provider='sqloledb';Data Source='MySqlServer';"
         + "Initial Catalog='Pubs';Integrated Security='SSPI';";

      String strName;
      String strFName;
      String strLName;
      String strHDate;
      int intPage;
      int intRecord;

      try
      {
         rstEmployees = new Recordset();

         // Use client cursor to enable AbsolutePosition property.
         rstEmployees.setCursorLocation( AdoEnums.CursorLocation.CLIENT);

         // Open a recordset using client cursor for the Employees table.
         rstEmployees.open("employee", strCnn,
            AdoEnums.CursorType.FORWARDONLY,
            AdoEnums.LockType.READONLY,
            AdoEnums.CommandType.TABLE);

         // Display names and hire dates, five records at a time.

         rstEmployees.setPageSize(5);
         int intPageCount = rstEmployees.getPageCount();
         for ( intPage = 1; intPage <= intPageCount; intPage++)
         {
            strName = "";
            rstEmployees.setAbsolutePage(intPage);
            for ( intRecord = 1; intRecord <= rstEmployees.getPageSize(); 
               intRecord++)
            {
               strFName = rstEmployees.getField("fname").getString();
               strLName = rstEmployees.getField("lname").getString();
               strHDate = rstEmployees.getField("hire_date").getString();

               strHDate = strHDate.substring(5,7) + "/" + 
                  strHDate.substring(8,10) +
                  "/" + strHDate.substring(2,4);

               strName = strName + "\n" + strFName + " " + strLName + 
                  "  " + strHDate;
               rstEmployees.moveNext();
               if ( rstEmployees.getEOF())
                  break;
            }
            System.out.println(strName);
            // Get user input to display next records.

            System.out.println("\n\nPress <Enter> key to Continue.");
            line = in.readLine();
         }
      }
      catch( AdoException ae )
      {
         // Notify user of any errors that result from ADO.

         // Check for null pointer for connection object.
         if (rstEmployees.getActiveConnection()==null)
            System.out.println("Exception: " + ae.getMessage());

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

   // 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");
   }
}
// EndAbsolutePageJ
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