assert jdbcConnection != null;
if ( jdbcConnection == null ) { return null; }
      public DatabaseMetaData getMetaData()      {      	assert jdbcConnection != null;      	      	if ( metaData == null)      	{      		try			{      			metaData = jdbcConnection.getMetaData();			}      		catch(SQLException e)			{      			e.printStackTrace();			}      	}      	      	return metaData;      }