GetString Method Example (VJ++)

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.

// 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 = "DSN=Pubs;Provider=MSDASQL;uid=sa;pwd=;";
        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");

            // Cleanup objects before exit.
            rstAuthors.close();
            cnConn1.close();

            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);
        }

    }

    // 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");
    }
}