GetString Method Example (VJ++)

 

This example demonstrates the GetString method.

Assume you are debugging a data access problem and want a quick, simple way of printing the current contents of a small Recordset.

// BeginGetStringJ
// The WFC class includes the ADO objects.
import com.ms.wfc.data.*;
import java.io.* ;

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

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

   // GetStringX  function
   static void GetStringX()
   {
      // Define ADO Objects.
      Connection cnConn1 = null;
      Recordset rstAuthors = null;

      // Declarations.
      BufferedReader in = 
         new BufferedReader (new InputStreamReader(System.in));
      String strCnn = "Provider='sqloledb';Data Source='MySqlServer';" +
            "Initial Catalog='Pubs';Integrated Security='SSPI';";
      String strOutput;

      try
      {
         // Get the user input for state.
         System.out.println(
            "Enter a state (CA, IN, KS, MD, MI, OR, TN, UT): ");
         String strState = in.readLine().trim();
         String strQuery = 
            "SELECT au_fname, au_lname, address, city FROM Authors " +
                    "WHERE state = '" + strState + "'";

         // Open recordset with data from Authors table.
         cnConn1 = new Connection();
         cnConn1.open(strCnn);
         rstAuthors = new Recordset();
         rstAuthors.open(strQuery,
                cnConn1,
                AdoEnums.CursorType.STATIC,
                AdoEnums.LockType.READONLY,
                AdoEnums.CommandType.TEXT);

         if (rstAuthors.getRecordCount() > 0)
         {
            // Use all defaults: get all rows, TAB column delimiter, 
            // CARRIAGE RETURN
            // row delimiter, empty-string null delimiter.
            strOutput = 
               rstAuthors.getString(AdoEnums.StringFormat.CLIPSTRING,
               rstAuthors.getRecordCount(),
               "\t ",
               "\n",
               "").trim();
            System.out.println("\nState = '" + strState + "'" +
               "\n\n" +
               "Name             Address             City" +
               "\n");
            System.out.println(strOutput);
         }
         else
            System.out.println("\nNo rows found for state = '" +
               strState + "'\n");

         System.out.println("\nPress <Enter> to continue..");
         in.readLine();
      }
      catch( AdoException ae )
      {
         // Notify user of any errors that result from ADO.

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

      // System read requires this catch.
      catch( java.io.IOException je)
      {
         PrintIOError(je);
      }   

      finally
      {
         // Cleanup objects before exit.   
         if (rstAuthors != null)
            if (rstAuthors.getState() == 1)
               rstAuthors.close();   
         if (cnConn1 != null)
            if (cnConn1.getState() == 1)
               cnConn1.close();
      }

   }

   // 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");
   }
}
// EndGetStringJ
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