Bug 208718 Exception is thrown out when exported data with column's data type [0002]
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/service/actionhandler/AbstractQueryExportActionHandler.java
{
	/*
	 * Existed document file
	 */
	protected String __docName;
	/**
	 * Abstract method to handle update response object.
	 * 
	 * @param resultSets
	 */
	protected abstract void handleUpdate( ResultSets resultSets );
	/**
	 * Check if document file exists.
	 * 
	 * @throws Exception
	 */
	abstract protected void __checkDocumentExists( ) throws Exception;
	/**
	 * Constructor.
	 * 
	 * @param context
	 * @param operation
	 * @param response
	 */
	public AbstractQueryExportActionHandler( IContext context,
			Operation operation, GetUpdatedObjectsResponse response )
	{
		super( context, operation, response );
	}
	/**