Name
RDF_VIEW_SYNC_TO_PHYSICAL — This function generates data synchronization triggers and/or actual RDF quad store data from transient Linked Data views. Basically, it enables you share physical and transient Linked Data views typically generated from 3rd party ODBC/JDBC accessible data sources.
Synopsis
RDF_VIEW_SYNC_TO_PHYSICAL
(
|
in vgraph varchar , |
| in load_data int := 0 , | |
| in pgraph varchar := null , | |
| in transaction_mode int := 1 , | |
in
atomicity
int := 1
); |
Description
This function create new Transient and Materialized View pairs with option (where load = 1/0) to load data or wait for updates -- from triggers at execute time. 0 for non-transaction mode, and atomicity 0/1 determines server accessiblity where 1 indicates inaccessiblity during run. Note: applicable for Virtuoso 6.0 and higher.
Parameters
vgraph
The transient (or virutal) named graph to which synchronization triggers are to be associated, or the actual source of data used to populate a named graph in the quad store.
load_data
Flag that determines which operations are performed:
-
0 -- only create synchronization triggers;
-
1 -- create synchronization triggers and then immediately load data into a designated quad store named graph.
pgraph
Designated quad store named graph IRI.
transaction_mode
Integer values (0, 1, 2, or 3) which determine the transaction mode in place during synchronization. This is basically a call to log_enable () with the same values.
atomicity
Enforces atomic mode during data synchronization. This mode of operation performs a checkpoint when completed, and is the recommended behavior for handling transient Linked Data views derived from large SQL large tables.
Return Types
any
Examples
Example 24.272.
Example 1
Using the command-line iSQL utility or its variant hosted in the HTML based Conductor, and assuming named graphs denoted by the following IRIs:
-
<http://www.openlinksw.com/schemas/odbcCustomers#> -- a named graph associated with virtual (and transient) RDF statements (triples) mapped to an ODBC accessible data source e.g., a "Customers" database.
-
<urn:rdf:materialized:view:odbc:Customers> -- a named graph to be associated with RDF statements (triples) materialized from virtual triples in the designated source named graph.
SQL> RDF_VIEW_SYNC_TO_PHYSICAL ('http://www.openlinksw.com/schemas/odbcCustomers#', 1, 'urn:rdf:materialized:view:odbc:Customers');
# which is equivalent to:
SQL> RDF_VIEW_SYNC_TO_PHYSICAL ('http://www.openlinksw.com/schemas/odbcCustomers#', 1, 'urn:rdf:materialized:view:odbc:Customers', 1, 1);
Example 2
A variant of the prior example where with ACID transaction modality enabled:
SQL> RDF_VIEW_SYNC_TO_PHYSICAL ('http://www.openlinksw.com/schemas/odbcCustomers#', 0, 'urn:rdf:materialized:view:odbc:Customers', 1, 1);