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SQL Anywhere 12.0.0 » UltraLiteJ » Using UltraLiteJ » Tutorial: Building an UltraLiteJ application for BlackBerry » Code listing for tutorial

 

DataAccess.java



/*
 * DataAccess.java
 *
 * © <your company here>, 2003-2005
 * Confidential and proprietary.
 */

package myapp;

import com.ianywhere.ultralitej12.*;
import java.util.*;
import net.rim.device.api.ui.*;
import net.rim.device.api.ui.component.*;
import net.rim.device.api.ui.container.*;

/**
 * 
 */
class DataAccess {
    DataAccess() {    }
    
    public static synchronized DataAccess getDataAccess(boolean reset) throws Exception 
    {   
        if( _da == null ){
            _da = new DataAccess();
            ConfigObjectStore config = DatabaseManager.createConfigurationObjectStore("HelloDB");
            if(reset)
            {
                _conn = DatabaseManager.createDatabase( config );
                _da.createDatabaseSchema();
            } 
            else
            {
                try{
                    _conn = DatabaseManager.connect( config );
                }
                catch( ULjException uex1) {
                    if( uex1.getErrorCode() != ULjException.SQLE_ULTRALITE_DATABASE_NOT_FOUND ) {
                        Dialog.alert( "Exception: " + uex1.toString() + ". Recreating database..." );
                    }
                    _conn = DatabaseManager.createDatabase( config );
                    _da.createDatabaseSchema();
                }
            }
        }
        return _da;
    }
    
    /**
     * 
     * Create the table in the database. 
     * If the table already exists, a harmless exception is thrown
     */
    private void createDatabaseSchema()
    {
        try{
            String sql = "CREATE TABLE Names ( ID UNIQUEIDENTIFIER DEFAULT NEWID(), Name VARCHAR(254), " +
                "PRIMARY KEY ( ID ) )";
            PreparedStatement ps = _conn.prepareStatement(sql);
            ps.execute();
            ps.close();
        }
        catch( ULjException uex1){
            Dialog.alert( "ULjException: " + uex1.toString() );
        }
        catch( Exception ex1){
            Dialog.alert( "Exception: " + ex1.toString() );
        }
    }
    
    public void insertName( String name ){
        try{
            UUIDValue nameID = _conn.createUUIDValue();
            String sql = "INSERT INTO Names( ID, Name ) VALUES ( ?, ? )";           
            PreparedStatement ps = _conn.prepareStatement(sql);
            ps.set(1, nameID );
            ps.set(2, name );
            ps.execute();
            _conn.commit();
        }
        catch( ULjException uex ){
            Dialog.alert( "ULjException: " + uex.toString() );
        }
        catch( Exception ex ){
            Dialog.alert( "Exception: " + ex.toString() );
        }  
    }      

    public Vector getNameVector(){
        Vector nameVector = new Vector();
        try{
            String sql = "SELECT ID, Name FROM Names";
            PreparedStatement ps = _conn.prepareStatement(sql);
            ResultSet rs = ps.executeQuery();
            while ( rs.next() ){
                String nameID = rs.getString(1);
                String name = rs.getString(2);
                NameRow nr = new NameRow( nameID, name);
                nameVector.addElement(nr);
            }
        }
        catch( ULjException uex ){
            Dialog.alert( "ULjException: " + uex.toString() );
        }
        catch( Exception ex ){
            Dialog.alert( "Exception: " + ex.toString() );
        }
        finally{
            return nameVector;
        }
    }
    
    public boolean sync() {
        try {
            if( _syncParms == null ){
                String host = "relayserver.sybase.com/ias_relay_server/client/rs_client.dll/tomslee.HelloBlackBerry";
                _syncParms = _conn.createSyncParms( "mluser", "HelloBlackBerrySyncModel" );
                _syncParms.setPassword("mlpassword");
                _streamParms = _syncParms.getStreamParms();
                _streamParms.setPort( 8081 ); // use your own
                _streamParms.setHost( host ); // use your own
                if(host.equals("relayserver.sybase.com/ias_relay_server/client/rs_client.dll/tomslee.HelloBlackBerry"))
                {
                    _streamParms.setURLSuffix("/ias_relay_server/client/rs_client.dll/tomslee.HelloBlackBerry");
                }

            }
            _conn.synchronize( _syncParms ); 
            return true;
        }
        catch( ULjException uex){
            Dialog.alert(uex.toString());
            return false;
        }
    }
    
    public boolean complete() {
        try{
            _conn.checkpoint();
            _conn.release();
            _conn = null;
            _da = null;
            return true;
        }
        catch(Exception e){
            return false;
        }
    }

    private static Connection _conn;
    private static DataAccess _da;
    private static SyncParms _syncParms;
    private static StreamHTTPParms _streamParms;
}