NumericScale and Precision Properties Example (VJ++)

NumericScale and Precision Properties Example (VJ++)

This example uses the NumericScale and Precision properties to display the numeric scale and precision of fields in the Discounts table of the Pubs database.

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

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

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

    // NumericScaleX function

    static void NumericScaleX()
    {

        // Define ADO Objects.
        Recordset rstDiscounts = null;
        Field fldTemp = null;

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

        try
        {
            rstDiscounts = new Recordset();

            // Open recordset.
            rstDiscounts.open("Discounts", strCnn,
                          AdoEnums.CursorType.FORWARDONLY,
                          AdoEnums.LockType.READONLY,
                          AdoEnums.CommandType.TABLE);

            // Display numeric scale and precision of
            // numeric and small integer fields.
            for ( intLoop=0; intLoop < 
                rstDiscounts.getFields().getCount();intLoop++)
            {
                fldTemp = rstDiscounts.getFields().getItem(intLoop);
                if((fldTemp.getType()== AdoEnums.DataType.NUMERIC) |
                    (fldTemp.getType()== AdoEnums.DataType.SMALLINT))
                {
                    System.out.println("\nField: "
                        + fldTemp.getName());
                    System.out.println("\nNumeric scale: "
                        + fldTemp.getNumericScale());
                    System.out.println("\nPrecision: "
                        + fldTemp.getPrecision());
                    System.out.println("\n\nPress <Enter> to continue..");
                    in.readLine();
                }
            }

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

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

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