Examples with Schema org.neo4j.graphdb.schema.Schema used on opensource projects

Example 1 with Schema

use of org.neo4j.graphdb.schema.Schema in project neo4j by neo4j.

the class SchemaAcceptanceTest method shouldThrowConstraintViolationIfAskedToIndexPropertyThatIsAlreadyIndexed.

@Test
public void shouldThrowConstraintViolationIfAskedToIndexPropertyThatIsAlreadyIndexed() throws Exception {
    // GIVEN
    Schema schema;
    try (Transaction tx = db.beginTx()) {
        schema = db.schema();
        schema.indexFor(label).on(propertyKey).create();
        tx.success();
    }
    // WHEN
    ConstraintViolationException caught = null;
    try (Transaction tx = db.beginTx()) {
        schema.indexFor(label).on(propertyKey).create();
        tx.success();
    } catch (ConstraintViolationException e) {
        caught = e;
    }
    // THEN
    assertThat(caught, not(nullValue()));
}

Example 2 with Schema

use of org.neo4j.graphdb.schema.Schema in project neo4j by neo4j.

the class LucenePartitionedIndexStressTesting method dropAllIndexes.

private void dropAllIndexes() {
    try (Transaction transaction = db.beginTx()) {
        Schema schema = db.schema();
        schema.getConstraints().forEach(ConstraintDefinition::drop);
        schema.getIndexes().forEach(IndexDefinition::drop);
        transaction.success();
    }
}

Example 3 with Schema

use of org.neo4j.graphdb.schema.Schema in project neo4j by neo4j.

the class LucenePartitionedIndexStressTesting method awaitIndexesOnline.

private void awaitIndexesOnline(GraphDatabaseService db) {
    try (Transaction ignored = db.beginTx()) {
        Schema schema = db.schema();
        schema.awaitIndexesOnline(WAIT_DURATION_MINUTES, TimeUnit.MINUTES);
    }
}

Example 4 with Schema

use of org.neo4j.graphdb.schema.Schema in project neo4j-documentation by neo4j.

the class EmbeddedNeo4jWithNewIndexing method main.

public static void main(final String[] args) throws IOException {
    System.out.println("Starting database ...");
    FileUtils.deleteRecursively(databaseDirectory);
    // START SNIPPET: startDb
    GraphDatabaseService graphDb = new GraphDatabaseFactory().newEmbeddedDatabase(databaseDirectory);
    // END SNIPPET: startDb
    {
        // START SNIPPET: createIndex
        IndexDefinition indexDefinition;
        try (Transaction tx = graphDb.beginTx()) {
            Schema schema = graphDb.schema();
            indexDefinition = schema.indexFor(Label.label("User")).on("username").create();
            tx.success();
        }
        // START SNIPPET: wait
        try (Transaction tx = graphDb.beginTx()) {
            Schema schema = graphDb.schema();
            schema.awaitIndexOnline(indexDefinition, 10, TimeUnit.SECONDS);
        }
        // START SNIPPET: progress
        try (Transaction tx = graphDb.beginTx()) {
            Schema schema = graphDb.schema();
            System.out.println(String.format("Percent complete: %1.0f%%", schema.getIndexPopulationProgress(indexDefinition).getCompletedPercentage()));
        }
    // END SNIPPET: progress
    }
    {
        // START SNIPPET: addUsers
        try (Transaction tx = graphDb.beginTx()) {
            Label label = Label.label("User");
            // Create some users
            for (int id = 0; id < 100; id++) {
                Node userNode = graphDb.createNode(label);
                userNode.setProperty("username", "user" + id + "@neo4j.org");
            }
            System.out.println("Users created");
            tx.success();
        }
    // END SNIPPET: addUsers
    }
    {
        // START SNIPPET: findUsers
        Label label = Label.label("User");
        int idToFind = 45;
        String nameToFind = "user" + idToFind + "@neo4j.org";
        try (Transaction tx = graphDb.beginTx()) {
            try (ResourceIterator<Node> users = graphDb.findNodes(label, "username", nameToFind)) {
                ArrayList<Node> userNodes = new ArrayList<>();
                while (users.hasNext()) {
                    userNodes.add(users.next());
                }
                for (Node node : userNodes) {
                    System.out.println("The username of user " + idToFind + " is " + node.getProperty("username"));
                }
            }
        }
    // END SNIPPET: findUsers
    }
    {
        // START SNIPPET: resourceIterator
        Label label = Label.label("User");
        int idToFind = 45;
        String nameToFind = "user" + idToFind + "@neo4j.org";
        try (Transaction tx = graphDb.beginTx();
            ResourceIterator<Node> users = graphDb.findNodes(label, "username", nameToFind)) {
            Node firstUserNode;
            if (users.hasNext()) {
                firstUserNode = users.next();
            }
            users.close();
        }
    // END SNIPPET: resourceIterator
    }
    {
        // START SNIPPET: updateUsers
        try (Transaction tx = graphDb.beginTx()) {
            Label label = Label.label("User");
            int idToFind = 45;
            String nameToFind = "user" + idToFind + "@neo4j.org";
            for (Node node : loop(graphDb.findNodes(label, "username", nameToFind))) {
                node.setProperty("username", "user" + (idToFind + 1) + "@neo4j.org");
            }
            tx.success();
        }
    // END SNIPPET: updateUsers
    }
    {
        // START SNIPPET: deleteUsers
        try (Transaction tx = graphDb.beginTx()) {
            Label label = Label.label("User");
            int idToFind = 46;
            String nameToFind = "user" + idToFind + "@neo4j.org";
            for (Node node : loop(graphDb.findNodes(label, "username", nameToFind))) {
                node.delete();
            }
            tx.success();
        }
    // END SNIPPET: deleteUsers
    }
    {
        // START SNIPPET: dropIndex
        try (Transaction tx = graphDb.beginTx()) {
            Label label = Label.label("User");
            for (IndexDefinition indexDefinition : graphDb.schema().getIndexes(label)) {
                // There is only one index
                indexDefinition.drop();
            }
            tx.success();
        }
    // END SNIPPET: dropIndex
    }
    System.out.println("Shutting down database ...");
    // START SNIPPET: shutdownDb
    graphDb.shutdown();
// END SNIPPET: shutdownDb
}

Example 5 with Schema

use of org.neo4j.graphdb.schema.Schema in project neo4j-documentation by neo4j.

the class BlockTypeTest method should_replace_filenames_in_queries.

@Test
public void should_replace_filenames_in_queries() throws Exception {
    assumeFalse(SystemUtils.IS_OS_WINDOWS);
    // given
    List<String> myQuery = Arrays.asList("[source, cypher]", "----", "LOAD CSV FROM \"my_file.csv\" AS line", "RETURN line;", "----");
    GraphDatabaseFacade graph = mock(GraphDatabaseFacade.class);
    Schema schema = mock(Schema.class);
    when(graph.schema()).thenReturn(schema);
    doNothing().when(schema).awaitIndexesOnline(anyLong(), any(TimeUnit.class));
    when(graph.beginTx()).thenReturn(mock(Transaction.class));
    Block block = new Block(myQuery, BlockType.CYPHER);
    org.neo4j.graphdb.Result result = mock(org.neo4j.graphdb.Result.class);
    ArgumentCaptor<String> fileQuery = ArgumentCaptor.forClass(String.class);
    ArgumentCaptor<String> httpQuery = ArgumentCaptor.forClass(String.class);
    when(graph.execute(fileQuery.capture(), eq(Collections.emptyMap()))).thenReturn(result);
    state = spy(new State(graph, null, new File("/dev/null"), "http://myurl"));
    doReturn("apa").when(state).prettify(httpQuery.capture());
    state.knownFiles.add("my_file.csv");
    // when
    block.process(state);
    // then
    assertThat(fileQuery.getValue(), containsString("file:/dev/null/my_file.csv"));
    assertThat(httpQuery.getValue(), containsString("http://myurl/my_file.csv"));
}