Append and CreateParameter Methods Example (VJ++)

This example uses the Append and CreateParameter methods to execute a stored procedure with an input parameter.

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

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

   public static void main (String[] args)
   {
      AppendX();
   }

   // AppendX function

   static void AppendX()
   {
      // Define ADO Objects.
      Connection cnConn1 = null;
      Command cmdByRoyalty = null;
      Parameter prmByRoyalty = null;
      Recordset rstByRoyalty = null;
      Recordset rstAuthors = null;

      //Declarations.
      String strCnn;
      String strAuthorID;
      String strFName;
      String strLName;
      int intRoyalty ;
      BufferedReader in = 
         new BufferedReader (new InputStreamReader (System.in));
      String line = null;
      Variant varRoyalty;

      try
      {
         // Open a connection.

         strCnn = "Provider='sqloledb';Data Source='MySqlServer';"
            + "Initial Catalog='Pubs';Integrated Security='SSPI';";
         cnConn1 = new Connection();
         cnConn1.open(strCnn);
         cnConn1.setCursorLocation(AdoEnums.CursorLocation.CLIENT);

         // Open command object with one parameter.
         cmdByRoyalty = new Command();
         cmdByRoyalty.setCommandText("byRoyalty");
         cmdByRoyalty.setCommandType(AdoEnums.CommandType.STOREDPROC);

         //Get parameter value and append parameter.
         System.out.println ("\nEnter Royalty : ");
         line = in.readLine().trim();
         intRoyalty = Integer.parseInt(line);
         varRoyalty = new Variant(intRoyalty);
         prmByRoyalty = cmdByRoyalty.createParameter ("percentage",
            AdoEnums.DataType.INTEGER,
            AdoEnums.ParameterDirection.INPUT,4,varRoyalty);

         cmdByRoyalty.getParameters().append(prmByRoyalty);
         prmByRoyalty.setValue(varRoyalty);

         // Create a recordset by executing the command.
         cmdByRoyalty.setActiveConnection(cnConn1);
         rstByRoyalty = cmdByRoyalty.execute();

         // Open the Authors table to get author names for display.
         rstAuthors = new Recordset ();
         rstAuthors.open("authors", cnConn1, 
            AdoEnums.CursorType.FORWARDONLY,
            AdoEnums.LockType.READONLY, 
            AdoEnums.CommandType.TABLE );

         // Print current data in the recordset,
         // adding author names from Authors table.
         System.out.println("\nAuthors with " + intRoyalty + 
            " percent royalty");
         while (!rstByRoyalty.getEOF())
         {
            strAuthorID =  rstByRoyalty.getField("au_id").getString();
            rstAuthors.setFilter("au_id ='" +  strAuthorID + "'");
            strFName = rstAuthors.getField("au_fname").getString();
            strLName = rstAuthors.getField("au_lname").getString();
            System.out.println("\t" + strAuthorID + ", " + strFName 
               + " " + strLName);
            rstByRoyalty.moveNext();
         }
         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(rstByRoyalty.getActiveConnection()==null)
            System.out.println("Exception: " + ae.getMessage());
         // As passing a Recordset, check for null pointer first.
         if (rstByRoyalty != null)
         {
            PrintProviderError(rstByRoyalty.getActiveConnection());
         }
         if (rstAuthors != null)
         {
            if (rstAuthors.getActiveConnection()==null)
               System.out.println("Exception: " + ae.getMessage());
            else
               PrintProviderError(rstAuthors.getActiveConnection());
         }
         else 
         {
            System.out.println("Exception: " + ae.getMessage());
         }
      }

      // This catch is required if input string cannot be converted to
      // Integer data type.
      catch( java.lang.NumberFormatException ne)
      {
         System.out.println("\nException: Integer Number required.");
         System.exit(0);
      }
      // System Read requires this catch.
      catch( java.io.IOException je )
      {
         PrintIOError(je);
      }      
      finally
      {
         // Cleanup objects before exit.   
         if (rstByRoyalty != null)
            if (rstByRoyalty.getState() == 1)
               rstByRoyalty.close();   
         if (rstAuthors != null)
            if (rstAuthors.getState() == 1)
               rstAuthors.close();   
         if (cnConn1 != null)
            if (cnConn1.getState() == 1)
               cnConn1.close();
         System.exit(0);//required here only.
      }


   }

   // PrintProviderError Function

   static void PrintProviderError( Connection Cnn1 )
   {
      // Print Provider errors from Connection object.
      // ErrItem is an item object in the Connections 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");
   }
}

// EndAppendJ

See Also

Append Method | CreateParameter Method