ActualSize and DefinedSize Properties Example (VJ++)

ActualSize and DefinedSize Properties Example (VJ++)

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");
    }
}