MDAC 2.5 SDK - ADO

MarshalOptions Property Example (VJ++)

See Also

This example uses the MarshalOptions property to specify what rows are sent back to the server—All Rows or only Modified Rows.

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

public class MarshalOptionsX
{
// The main entry point for the application.
public static void main (String[] args)
{
   MarshalOptionsX();
   System.exit(0);
}
// MarshalX Function

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

   // Declarations
   BufferedReader in = 
      new BufferedReader(new InputStreamReader(System.in));
   String line = null;

   try
   {

      // Open Recordset with names from Employees Table.
      String strCnn = " Provider=sqloledb;Data Source=srv;" +
             "Initial Catalog=Pubs;User Id=sa;Password=;";

      rstEmployees = new Recordset();
      rstEmployees.setCursorType(AdoEnums.CursorType.KEYSET);
      rstEmployees.setLockType(AdoEnums.LockType.OPTIMISTIC);
      rstEmployees.setCursorLocation(AdoEnums.CursorLocation.CLIENT);

      rstEmployees.open(
         "SELECT fname,lname from Employee ORDER BY lname", 
         strCnn,AdoEnums.CursorType.KEYSET, 
         AdoEnums.LockType.OPTIMISTIC, AdoEnums.CommandType.TEXT);

      // Store original data
      String strOldFirst = rstEmployees.getField("fname").getString();
      String strOldLast = rstEmployees.getField("lname").getString();

      // Change data in edit buffer
      rstEmployees.getField("fname").setString("Linda");
      rstEmployees.getField("lname").setString("Kobara");

      // Show contents of buffer and get user input
      String strMessage = "Edit in progress: "+ "\n"+
                "Original Data  = \t"+ strOldFirst +" "+
                strOldLast + "\n" + "Data in Buffer = \t"+
                rstEmployees.getField("fname").getString()+ " " +
                rstEmployees.getField("lname").getString()+"\n"+"\n"+
                "Use Update to replace the original data with " +
                "the buffered data in the recordset";
      String strMarshalAll = "Would you like to send all the rows" +
                  " in the recordset back to the server";
      String strMarshalModified = "Would you like to send only "+
                      " modified rows back to the server";

      System.out.println(strMessage + "\nEnter (Y/N)...");

      if (in.readLine().equalsIgnoreCase("Y"))
      {
         System.out.println(strMarshalAll);
         System.out.println("\nEnter (Y/N)...");

         if(in.readLine().equalsIgnoreCase("Y"))
         {
            rstEmployees.setMarshalOptions(AdoEnums.MarshalOptions.ALL);
            rstEmployees.update();
         }
         else
         {
            System.out.println(strMarshalModified);
            System.out.println("\nEnter (Y/N)...");

            if (in.readLine().equalsIgnoreCase("Y"))
            {
               rstEmployees.setMarshalOptions(
                  AdoEnums.MarshalOptions.MODIFIEDONLY);
               rstEmployees.update();
            }
         }

      }

      // Show the resulting data
      System.out.println("\nData in recordset = " + 
         rstEmployees.getField("fname").getString() + 
         " " + rstEmployees.getField("lname").getString());

      // Restore original data because this is a demonstration
      if (!((strOldFirst.equals(rstEmployees.getField("fname")))
         &&(strOldLast.equals(rstEmployees.getField("lname")))))
      {
         rstEmployees.getField("fname").setString(strOldFirst);
         rstEmployees.getField("lname").setString(strOldLast);
         rstEmployees.update();
      }
   // Cleanup objects before exit
   rstEmployees.close();
   System.out.println("\n\nPress <Enter> to continue..");
   in.readLine();
   }

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

      // As passing a connection, check for null pointer first
      if(rstEmployees!= null)
      {
         PrintProviderError(rstEmployees.getActiveConnection());
      }
      else
      {
         System.out.println("Exception: " + ae.getLocalizedMessage());
      }
   }

   // 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");
   }
}