MDAC 2.5 SDK - ADO

Value Property Example (VJ++)

See Also

This example demonstrates the Value property with Field and Property objects by displaying field and property values for the Employees table.

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

public class ValueX
{
   // Main Function
   public static void main (String[] args)
   {
      ValueX();
      System.exit(0);
   }
   static void ValueX()
   {
      // Define ADO Objects.
      Recordset rstEmployees = null;
      Field    fldLoop     = null;
      AdoProperty  prpLoop   = null;

      // Declarations.
      String strCnn = "Provider=sqloledb; Data Source= srv;" +
         "Initial Catalog=Pubs; User Id=sa; Password=;";
      int intLoop;
      BufferedReader in = new 
         BufferedReader(new InputStreamReader(System.in));
      Variant varPropertyValue;
      String strMessage;

      try
      {
         // Open a Recordset with data from Employees table.
         rstEmployees = new Recordset();
         rstEmployees.open("employee", strCnn, 
            AdoEnums.CursorType.FORWARDONLY, AdoEnums.LockType.READONLY, 
            AdoEnums.CommandType.TABLE);

         System.out.println("Field values in rstEmployees\n");

         // Enumerate the Fields collection of the Employees
         // table.
         for(intLoop = 0;
            intLoop<rstEmployees.getFields().getCount();intLoop++)
         {
            fldLoop = rstEmployees.getFields().getItem(intLoop);
            // Because Value is the default property of a
            // Field object, the use of the actual keyword
            // here is optional.
            System.out.println("\t" + fldLoop.getName() + " = " + 
               fldLoop.getValue());
         }
         System.out.println("\nPress <Enter> to continue..");
         in.readLine();
         System.out.println("Property values in rstEmployees\n");

         // Enumerate the Properties collection of the
         // Recordset object.
         int intCount = 0;
         for(intLoop = 0;
            intLoop<rstEmployees.getProperties().getCount();intLoop++)
         {
            prpLoop = rstEmployees.getProperties().getItem(intLoop);
            // Because Value is the default property of a
            // Field object, the use of the actual keyword
            // here is optional.
            strMessage = "\t" + prpLoop.getName() + " =  ";
            varPropertyValue = prpLoop.getValue();
            short vttype =varPropertyValue.getvt();
            switch (vttype)
            {
            case Variant.VariantBoolean :
               {
                  if (varPropertyValue.getBoolean())
                     strMessage +="True";
                  else
                     strMessage +="False";
               }
               break;
            case Variant.VariantInt :
               strMessage += varPropertyValue.getInt();
               break;
            default :
               break;
            }
            System.out.println(strMessage);
            intCount++;
            // Loop used to display records
            if (intCount % 15 == 0)
            {
               System.out.println("\nPress <Enter> to continue..");
               in.readLine();
               intCount = 0;
            }

         }
         // Cleanup objects before exit.
         rstEmployees.close();
         System.out.println("\nPress <Enter> to continue..");
         in.readLine();
      }
      // 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 null pointer first.
         if(rstEmployees != null)
         {
            PrintProviderError(rstEmployees.getActiveConnection());
         }
         else
         {
            System.out.println("Exception: " + ae.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("\t Source: " + je.getClass() + "\n");
      System.out.println("\t Description: "+ je.getMessage() + "\n");
   }
}