public DatabaseURIHelper partition(String partitionKey) {
        if (partitionKey != null) {
            this.path("_partition").path(partitionKey);
        }
        return returnThis();
    }
public DatabaseURIHelper partition ( String partitionKey ) { if ( partitionKey != null ) { this . path ( "_partition" ) . path ( partitionKey ) ; } return returnThis ( ) ; }
Set the database partition for the URI (iff partition key is non-null).