AbsolutePage, PageCount, and PageSize Properties Example (VJ++)

AbsolutePage, PageCount, and PageSize Properties Example (VJ++)

This example uses the AbsolutePage, PageCount, and PageSize properties to display names and hire dates from the Employees table, five records at a time.

// The WFC class includes the ADO objects.

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

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

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

    // AbsolutePageX function

    static void AbsolutePageX()
    {

        // Define ADO Objects.
        Recordset rstEmployees = null;

        // Declarations.
        BufferedReader in = new BufferedReader (new 
            InputStreamReader(System.in));
        String line = null;
        String strCnn = "Provider=sqloledb;Data Source=srv;"
            + "Initial Catalog=pubs;User Id=sa;Password=;";

        String strName;
        String strFName;
        String strLName;
        String strHDate;
        int intPage;
        int intRecord;

        try
        {
            rstEmployees = new Recordset();

            // Use client cursor to enable AbsolutePosition property.
            rstEmployees.setCursorLocation( AdoEnums.CursorLocation.CLIENT);

            // Open a recordset using client cursor for the Employees table.
            rstEmployees.open("employee", strCnn,
                AdoEnums.CursorType.FORWARDONLY,
                AdoEnums.LockType.READONLY,
                AdoEnums.CommandType.TABLE);

            // Display names and hire dates, five records at a time.

            rstEmployees.setPageSize(5);
            int intPageCount = rstEmployees.getPageCount();
            for ( intPage = 1; intPage <= intPageCount; intPage++)
            {
                strName = "";
                rstEmployees.setAbsolutePage(intPage);
                for ( intRecord = 1; intRecord <= rstEmployees.getPageSize(); 
                    intRecord++)
                {
                    strFName = rstEmployees.getField("fname").getString();
                    strLName = rstEmployees.getField("lname").getString();
                    strHDate = rstEmployees.getField("hire_date").getString();

                    strHDate = strHDate.substring(5,7) + "/" + 
                        strHDate.substring(8,10) +
                        "/" + strHDate.substring(2,4);

                    strName = strName + "\n" + strFName + " " + strLName + 
                        "  " + strHDate;
                    rstEmployees.moveNext();
                    if ( rstEmployees.getEOF())
                        break;
                }
                System.out.println(strName);
                // Get user input to display next records.

                System.out.println("\n\nPress <Enter> key to Continue.");
                line = in.readLine();
            }

            // Cleanup objects before exit.   
            rstEmployees.close();

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

            // Check for null pointer for connection object.
            if (rstEmployees.getActiveConnection()==null)
                System.out.println("Exception: " + ae.getMessage());

            // As passing a Recordset, check for null pointer first.
            if (rstEmployees != null)
            {
                PrintProviderError(rstEmployees.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");
    }
}