MDAC 2.5 SDK - ADO

ActualSize and DefinedSize Properties Example (VJ++)

See Also

This example uses the ActualSize and DefinedSize properties to display the defined size and actual size of a field.

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

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

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

   // ActualSizeX function

   static void ActualSizeX()
   {

      // Define ADO Objects.
      Recordset rstStores = null;

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

      String strStoreName;
      String strMessage;
      String strDSize,strASize;
      int intDefinedSize;
      int intActualSize;
      int intChoice = 0;

      try
      {
         // Open recordset with Stores table.
         rstStores = new Recordset();
         rstStores.open("stores", strCnn,
            AdoEnums.CursorType.FORWARDONLY ,
            AdoEnums.LockType.READONLY ,
            AdoEnums.CommandType.TABLE);

         // Loop through the Recordset displaying the contents
         // of the stor_name field, the field's defined size
         // and it's actual size.

         while ( !(rstStores.getEOF( ))) // continuous loop
         {
            // Read data field in the variables.
            strStoreName = rstStores.getField("stor_name").getString();
            intDefinedSize = 
               rstStores.getField("stor_name").getDefinedSize();
            strDSize = Integer.toString(intDefinedSize);
            intActualSize = rstStores.getField 
               ("stor_name").getActualSize ();
            strASize = Integer.toString(intActualSize);

            // Display current record information.
            strMessage = "\nStore name: " + strStoreName + "\n"
                + "Defined Size : " + strDSize + "\n"
                + "Actual Size : " + strASize;

            System.out.println(strMessage);
            System.out.println("\nPress <Enter> key to continue.");
            in.readLine();
            rstStores.moveNext();
         }

         // Cleanup objects before exit.
         rstStores.close();
      }
      catch( AdoException ae )
      {
         // Notify user of any errors that result from ADO.

         // Check for null pointer for connection object.
         if (rstStores.getActiveConnection()==null)
            System.out.println("Exception: " + ae.getMessage());
         // As passing a Recordset, check for null pointer first.
         if (rstStores != null)
         {
            PrintProviderError(rstStores.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");
   }
}