ActiveCommand プロパティ の例 (VJ++)

この例では、ActiveCommand プロパティの機能を示します。

サブルーチンに Recordset オブジェクトを渡し、その Recordset オブジェクトの ActiveCommand プロパティを使って、その Recordset を作成したコマンド テキストとパラメータを表示します。

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

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

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

    // ActiveCommandX function

    static void ActiveCommandX()
    {
        // Define ADO Objects.
        Connection cnConn1 = null;
        Command cmd = null;
        Recordset rstAuthors = null;

        // Declarations.
        BufferedReader in = 
            new BufferedReader (new InputStreamReader(System.in));
        String strCnn = "DSN=pubs;Provider=MSDASQL;uid=sa;pwd=;";
        String strName;

        try
        {
            System.out.println("Enter an author's name (e.g., Ringer): ");
            strName = in.readLine().trim();
            cmd = new Command();
            cmd.setCommandText("SELECT * FROM authors WHERE au_lname = ?");
            cmd.getParameters().append(cmd.createParameter("LastName",
                AdoEnums.DataType.CHAR,
                AdoEnums.ParameterDirection.INPUT, 20, strName));
            cnConn1 = new Connection();
            cnConn1.open(strCnn);
            cmd.setActiveConnection(cnConn1);
            rstAuthors = cmd.execute(null,AdoEnums.CommandType.TEXT);
            ActiveCommandXprint(rstAuthors);

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

    // ActiveCommandXprint function
    static void ActiveCommandXprint(Recordset rstp)
    {
        // Declarations.
        BufferedReader in = 
            new BufferedReader (new InputStreamReader(System.in));
        String strName;

        try
        {
            strName = rstp.getActiveCommand().getParameters().
                getItem("LastName").getValue().toString();
            System.out.println("\nCommand text = '" +
                rstp.getActiveCommand().getCommandText() + "'");
            System.out.println("Parameter = '" + strName + "'");
            if(rstp.getBOF())
            {
                System.out.println("Name = '" + strName + "', not found.");
            }
            else
            {
                System.out.println("Name = '" +
                    rstp.getField("au_fname").getString() + " " + 
                    rstp.getField("au_lname").getString() + 
                    "', author ID = '" + 
                    rstp.getField("au_id").getString() + "'");
            }
            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 (rstp != null)
            {
                PrintProviderError(rstp.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");
    }
}