Examples of org.openrdf.sail.SailConnection.removeStatements()

org.openrdf.sail.SailConnection.removeStatements()
Removes all statements matching the specified subject, predicate and object from the repository. All three parameters may be null to indicate wildcards. @param subj The subject of the statement that should be removed, or null to indicate a wildcard. @param pred The predicate of the statement that should be removed, or null to indicate a wildcard. @param obj The object of the statement that should be removed , or null to indicate a wildcard. @param contexts The context(s) from which to remove the statement. Note that this parameter is a vararg and as such is optional. If no contexts are specified the method operates on the entire repository. A null value can be used to match context-less statements. @throws StoreException If the statement could not be removed.

            after = countStatements(sc, uriA, null, null, false, uriA);
            assertEquals(0, before);
            assertEquals(1, after);


            // default context, same S,P,O
            sc.removeStatements(uriA, null, null);
            sc.commit();
            sc.begin();
            before = countStatements(sc, uriA, null, null, false);
            sc.addStatement(uriA, uriB, uriC);
            sc.commit();

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            URI uriB = sail.getValueFactory().createURI("http://example.org/test/SP_OG#b");
            URI uriC = sail.getValueFactory().createURI("http://example.org/test/SP_OG#c");
            int before, after;


            // Add statement to the implicit null context.
            sc.removeStatements(null, null, null);
            before = countStatements(sc, uriA, uriB, null, false);
            sc.addStatement(uriA, uriB, uriC);
            sc.commit();
            sc.begin();
            after = countStatements(sc, uriA, uriB, null, false);

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            Literal plainLitA = sail.getValueFactory().createLiteral("arbitrary plain literal 9548734867");
            Literal stringLitA = sail.getValueFactory().createLiteral("arbitrary string literal 8765", XMLSchema.STRING);
            int before, after;


            // Add statement to a specific context.
            sc.removeStatements(null, null, uriA, uriA);
            sc.commit();
            sc.begin();
            before = countStatements(sc, null, null, uriA, false);
            sc.addStatement(uriB, uriC, uriA);
            sc.commit();

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            after = countStatements(sc, null, null, uriA, false);
            assertEquals(0, before);
            assertEquals(1, after);


            // Add plain literal statement to the default context.
            sc.removeStatements(null, null, plainLitA);
            sc.commit();
            sc.begin();
            before = countStatements(sc, null, null, plainLitA, false);
            sc.addStatement(uriA, uriA, plainLitA);
            sc.commit();

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            after = countStatements(sc, null, null, plainLitA, false);
            assertEquals(0, before);
            assertEquals(1, after);


            // Add string-typed literal statement to the default context.
            sc.removeStatements(null, null, plainLitA);
            sc.commit();
            sc.begin();
            before = countStatements(sc, null, null, stringLitA, false);
            sc.addStatement(uriA, uriA, stringLitA);
            sc.commit();

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            Literal plainLitA = sail.getValueFactory().createLiteral("arbitrary plain literal 8765675");
            Literal fooLabel = sail.getValueFactory().createLiteral("foo", XMLSchema.STRING);
            int before, after;


            // Add statement to the implicit null context.
            sc.removeStatements(null, null, null, uriA);
            sc.commit();
            sc.begin();
            before = countStatements(sc, null, uriA, uriB, false);
            sc.addStatement(uriA, uriA, uriB);
            sc.commit();

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            after = countStatements(sc, null, uriA, uriB, false);
            assertEquals(0, before);
            assertEquals(1, after);


            // Add plain literal statement to the default context.
            sc.removeStatements(null, null, plainLitA);
            sc.commit();
            sc.begin();
            before = countStatements(sc, null, uriA, plainLitA, false);
            sc.addStatement(uriA, uriA, plainLitA);
            sc.addStatement(uriA, uriB, plainLitA);

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            after = countStatements(sc, null, uriA, plainLitA, false);
            assertEquals(0, before);
            assertEquals(1, after);


            // Add string-typed literal statement to the default context.
            sc.removeStatements(null, null, fooLabel);
            sc.commit();
            sc.begin();
            before = countStatements(sc, null, firstName, fooLabel, false);
            sc.addStatement(foo, firstName, fooLabel);
            sc.commit();

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            URI uriC = sail.getValueFactory().createURI("http://example.org/test/S_POG#c");
            URI uriD = sail.getValueFactory().createURI("http://example.org/test/S_POG#d");
            int before, after;


            // default context, different S,P,O
            sc.removeStatements(uriA, null, null);
            sc.commit();
            sc.begin();
            before = countStatements(sc, uriA, uriB, uriC, false);
            sc.addStatement(uriA, uriB, uriC);
            sc.commit();

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            after = countStatements(sc, uriA, uriB, uriC, false);
            assertEquals(0, before);
            assertEquals(1, after);


            // default context, same S,P,O
            sc.removeStatements(uriA, null, null);
            sc.commit();
            sc.begin();
            before = countStatements(sc, uriA, uriB, uriC, false);
            sc.addStatement(uriA, uriB, uriC);
            sc.commit();

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