Bug 211004 Failed to remove temp db directory after running multiple reports
Description: I use Report Engine API to do runAndrender, run and dataextract tasks on multiple reports. Before the Platform started, I change the temp folder(System.setProperty( "java.io.tmpdir", TEMP_HOME )). Each task is closed after it finished and I shutdown the Platform after all the tasks finished. In log I found "Fail to remove one or more file in temp db directory,but it will be removed when the VM exits: D:\BIRT_NG\temp/BIRTSampleDB_1196129572031_10a6ae2". In temp folder the BIRTSampleDB_XXX is still here but not removed. I think it is the issue when remove the Temp sampleDB. Build number: 2.3.0.v20071127-0630
data/org.eclipse.birt.report.data.oda.sampledb/src/org/eclipse/birt/report/data/oda/sampledb/SampledbPlugin.java
public static String getDBUrl( )
	{
		return getDBUrl(false);
	}
	
	/**
	 * Gets Derby connection URL
	 * @param shutdown if true, generate a URL for shutting down DB
	 */
	public static String getDBUrl( boolean shutdown )
	{
		String url = "jdbc:derby:" + dbDir + "/" + SAMPLE_DB_NAME;
		if ( shutdown )
			url += ";shutdown=true";
		return url;
	}
	
	/**
	 * Shuts down the Derby database
	 */
	private void shutDownDatabase()
	{
		logger.info( "Stopping Sampledb database at location " + dbDir );
		
		try
		{
			JDBCDriverManager.getInstance().getConnection( 
					SampleDBConstants.DERBY_DRIVER_CLASS, 
					getDBUrl(true), 
					SampleDBConstants.SAMPLE_DB_SCHEMA, "", null );