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  • %META:TOPICPARENT{name="VirtTipsAndTricksGuide"}% ---+How can I delete graphs using stored procedure? The following script demonstrates the use of custom stored procedures for deleting graph(s). It first creates a table <code><nowiki>GRAPHS_TO_DELETE</nowiki></code>, into which the names of the graphs to be deleted should be inserted, as follows: <verbatim> use MYUSR; create procedure GRAPHS_TO_DELETE_SP (in gd_iris any) { declare gd_iri iri_id; declare dp, row any; result_names (gd_iri); dp := dpipe (0, '__I2IDN'); foreach (varchar iri in GD_IRIS) do { dpipe_input (dp, iri); } while (0 <> (row := dpipe_next (dp, 0))) { result (row[0]); } } ; drop view GRAPHS_TO_DELETE_VIEW; create procedure view GRAPHS_TO_DELETE_VIEW as MYUSR.DBA.GRAPHS_TO_DELETE_SP (gd_iris) (gd_iri any); create procedure DELETE_GRAPHS (in g_iris any) { declare g_iids any; if (not isvector (g_iris) and g_iris is not null) signal ('22023', '.....', 'The input argument must be an array of strings or null'); if (not length (g_iris)) return 0; delete from DB.DBA.RDF_QUAD where G in (select * from GRAPHS_TO_DELETE_VIEW where gd_iris = g_iris) option (loop exists); return row_count (); } ; </verbatim> Finally call the procedure <code>DELETE_GRAPHS</code> to perform the deletion of the specified graphs. Note it does not return a result set and can be called as follows: <verbatim> SQL> select MYUSR.DBA.DELETE_GRAPHS (vector ('g1', 'g2', 'g3')); </verbatim> This will return the number of triples removed from the specified graphs. <b>Note</b>: the procedure only applies to the cluster so to get IRI IDs via partitioned pipe (DAQ). It is not usable on single. ---+++Related * [[VirtTipsAndTricksGuide][Virtuoso Tips and Tricks Collection]] * [[http://docs.openlinksw.com/virtuoso/sparqlextensions.html#rdfsparulexamples14][How can I delete triples from a graph?]]
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  • VirtTipsAndTricksDeleteGraphProc
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  • 2017-06-13T05:48:32Z
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  • 2017-06-13T05:48:32Z
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