Bug 207561 [Regression] Conversion errror when preview the attached report design
data/org.eclipse.birt.report.data.oda.jdbc.ui/src/org/eclipse/birt/report/data/oda/jdbc/ui/editors/SQLDataSetEditorPage.java
/**
	 * Sets the Root Element of the Available Data Sources This is usually the
	 * Name of the Catalog of the Database
	 */
	protected void setRootElement( )
	{
		rootNode = new TreeItem( availableDbObjectsTree, SWT.NONE );
		rootNode.setImage( dataBaseImage );
		DataSourceDesign dataSourceHandle = this.getDataSetDesign( )
				.getDataSourceDesign( );
		rootNode.setText( dataSourceHandle.getName( ) );
		rootNode.setData( new DbObject( "", DbObject.ROOT_NODE_TYPE ) );
	}
	/**
	 * Remove all available db objects
	 * 
	 */
	private void removeAllAvailableDbObjects( )
	{
		if ( availableDbObjectsTree != null )
			availableDbObjectsTree.removeAll( );
	}
	/**
	 * Gets the list of schema objects
	 */
	private void getAvailableSchema( )
	{
		if ( isSchemaSupported )
		{
			ResultSet schemas = metaDataProvider.getAllSchema( );