assert jdbcConnection != null;
if( jdbcConnection == null) { return null; }
	public ResultSet getAlltables( String cataLog, String schemaPattern,			String namePattern, String[] types )        {        	assert jdbcConnection != null;        	        	if ( metaData == null )        	{        	        		metaData = getMetaData();        	}        	        	ResultSet resultSet = null;        	if( cataLog != null && cataLog.trim().length() == 0)        	{        		cataLog = null;        	}        	        	if (metaData != null )        	{        		try				{				resultSet = metaData.getTables( cataLog,						schemaPattern,						namePattern,						types );				}        		catch(SQLException e)				{        			e.printStackTrace();				}        	}        	return resultSet;        }