Attributes、Name プロパティの例 (VJ++)

この例では、Connection、Field、および Property オブジェクトの Attributes プロパティの値を表示します。Name プロパティを使って、Field オブジェクトと Property オブジェクトの名前を表示します。

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

public class AttributesX
{
    // The main entry point for the application
    public static void main (String[] args)
    {
        AttributesX();
        System.exit(0);
    }

    // AttributeX Function

    static void AttributesX()
    {
        // Define ADO Objects.
        Connection cnConn1 = null;
        Recordset rstEmployees = null;
        Fields listOfFields = null;
        AdoProperties listOfProperties = 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=;";
        int recordDisplaySize = 15;
        int propertyCount = 0;
        try
        {
            // Open connection and recordset.
            cnConn1 = new Connection();
            cnConn1.open(strCnn);

            rstEmployees = new Recordset ();
            rstEmployees.open("employee", 
                cnConn1,AdoEnums.CursorType.FORWARDONLY, 
                AdoEnums.LockType.READONLY, AdoEnums.CommandType.TABLE);

            // Display the attributes of the connection.
            System.out.println("Connection attributes = " 
                + cnConn1.getAttributes());
            // Display the attributes of the Employees table's fields.
            System.out.println("\n\nField attributes : " + "\n");

            listOfFields = rstEmployees.getFields();

            for ( int i=0; i < listOfFields.getCount();i++)
            {
                System.out.println("\t\t" + listOfFields.getItem(i).getName()
                    + " = " + listOfFields.getItem(i).getAttributes());
            }

            // Display fields of the Employees table which are NULLABLE.
            System.out.println("\n\nNULLABLE Fields : " + "\n");
            for ( int i=0; i < listOfFields.getCount();i++)
            {
                if ((listOfFields.getItem(i).getAttributes() & 
                    AdoEnums.FieldAttribute.ISNULLABLE) > 0)
                    System.out.println("\t\t" + 
                    listOfFields.getItem(i).getName());

            }

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

            // Display the attributes of the Employees table's properties.
            System.out.println("\n\nProperty attributes : " );
            listOfProperties = rstEmployees.getProperties();
            for ( int i=0; i < listOfProperties.getCount() ;i++)
            {
                System.out.println("\t\t" + 
                    listOfProperties.getItem(i).getName()
                    + " = " + listOfProperties.getItem(i).getAttributes());

                if (propertyCount == recordDisplaySize)
                {
                    System.out.println ("\n\nPress <Enter> key to continue.");
                    line = in.readLine();
                    propertyCount = 0;
                }
                propertyCount++;
            }

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

            //Cleanup objects before exit.
            rstEmployees.close();
            cnConn1.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");
    }
}