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Introduction to Neo4j (#1098) 

* Nashorn

* Nashorn x2

* Nashorn added trailing newlines

* Cleanup

* Formatted script lines

* Change system outs to asserts

* Change Nashorn to be Junit tests

* Remove empty test

* Added Neo4j section

* Revert NashornTest
This commit is contained in:
Danil Kornishev 2017-02-07 14:34:10 -05:00 committed by Zeger Hendrikse
parent 92ad8123f1
commit a9d8c5f3a3
6 changed files with 409 additions and 3 deletions
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42
core-java/pom.xml
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@ -10,6 +10,44 @@
<dependencies>
<dependency>
<groupId>org.neo4j</groupId>
<artifactId>neo4j</artifactId>
<version>3.1.0</version>
</dependency>
<dependency>
<groupId>org.neo4j.driver</groupId>
<artifactId>neo4j-java-driver</artifactId>
<version>1.1.1</version>
</dependency>
<dependency>
<groupId>org.neo4j</groupId>
<artifactId>neo4j-jdbc-driver</artifactId>
<version>3.0.1</version>
</dependency>
<dependency>
<groupId>org.neo4j</groupId>
<artifactId>neo4j-ogm-core</artifactId>
<version>2.1.1</version>
</dependency>
<dependency>
<groupId>org.neo4j</groupId>
<artifactId>neo4j-ogm-embedded-driver</artifactId>
<version>2.1.1</version>
</dependency>
<dependency>
<groupId>com.google.inject</groupId>
<artifactId>guice</artifactId>
<version>4.1.0</version>
<classifier>no_aop</classifier>
<scope>test</scope>
</dependency>
<!-- utils -->
<dependency>
<groupId>net.sourceforge.collections</groupId>
@ -63,7 +101,6 @@
<artifactId>grep4j</artifactId>
<version>${grep4j.version}</version>
</dependency>
<!-- web -->
<!-- marshalling -->
@ -263,7 +300,8 @@
<configuration>
<shadedArtifactAttached>true</shadedArtifactAttached>
<transformers>
<transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
<transformer
implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
<mainClass>org.baeldung.executable.ExecutableMavenJar</mainClass>
</transformer>
</transformers>

50
core-java/src/main/java/com/baeldung/graph/Car.java Normal file
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@ -0,0 +1,50 @@
package com.baeldung.graph;
import org.neo4j.ogm.annotation.GraphId;
import org.neo4j.ogm.annotation.NodeEntity;
import org.neo4j.ogm.annotation.Relationship;
/**
* @author Danil Kornishev (danil.kornishev@mastercard.com)
*/
@NodeEntity
public class Car {
@GraphId
private Long id;
private String make;
@Relationship(direction = "INCOMING")
private Company company;
public Car(String make, String model) {
this.make = make;
this.model = model;
}
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getMake() {
return make;
}
public void setMake(String make) {
this.make = make;
}
public String getModel() {
return model;
}
public void setModel(String model) {
this.model = model;
}
private String model;
}

45
core-java/src/main/java/com/baeldung/graph/Company.java Normal file
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@ -0,0 +1,45 @@
package com.baeldung.graph;
import org.neo4j.ogm.annotation.NodeEntity;
import org.neo4j.ogm.annotation.Relationship;
/**
* @author Danil Kornishev (danil.kornishev@mastercard.com)
*/
@NodeEntity
public class Company {
private Long id;
private String name;
@Relationship(type="owns")
private Car car;
public Company(String name) {
this.name = name;
}
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Car getCar() {
return car;
}
public void setCar(Car car) {
this.car = car;
}
}

60
core-java/src/test/java/com/baeldung/graph/Neo4JServerTest.java Normal file
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@ -0,0 +1,60 @@
package com.baeldung.graph;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
import org.junit.Ignore;
import org.junit.Test;
import org.neo4j.driver.v1.AuthTokens;
import org.neo4j.driver.v1.Driver;
import org.neo4j.driver.v1.GraphDatabase;
import org.neo4j.driver.v1.Session;
import org.neo4j.driver.v1.StatementResult;
import org.testng.Assert;
@Ignore
public class Neo4JServerTest {
@Test
public void standAloneDriver() {
Driver driver = GraphDatabase.driver("bolt://localhost:7687", AuthTokens.basic("neo4j", "12345"));
Session session = driver.session();
session.run("CREATE (baeldung:Company {name:\"Baeldung\"}) " +
"-[:owns]-> (tesla:Car {make: 'tesla', model: 'modelX'})" +
"RETURN baeldung, tesla");
StatementResult result = session.run("MATCH (company:Company)-[:owns]-> (car:Car)" +
"WHERE car.make='tesla' and car.model='modelX'" +
"RETURN company.name");
Assert.assertTrue(result.hasNext());
Assert.assertEquals(result.next().get("company.name").asString(), "Baeldung");
session.close();
driver.close();
}
@Test
public void standAloneJdbc() throws Exception {
Connection con = DriverManager.getConnection("jdbc:neo4j:bolt://localhost/?user=neo4j,password=12345,scheme=basic");
// Querying
try (Statement stmt = con.createStatement()) {
stmt.execute("CREATE (baeldung:Company {name:\"Baeldung\"}) " +
"-[:owns]-> (tesla:Car {make: 'tesla', model: 'modelX'})" +
"RETURN baeldung, tesla");
ResultSet rs = stmt.executeQuery("MATCH (company:Company)-[:owns]-> (car:Car)" +
"WHERE car.make='tesla' and car.model='modelX'" +
"RETURN company.name");
while (rs.next()) {
Assert.assertEquals(rs.getString("company.name"), "Baeldung");
}
}
con.close();
}
}

46
core-java/src/test/java/com/baeldung/graph/Neo4jOgmTest.java Normal file
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@ -0,0 +1,46 @@
package com.baeldung.graph;
import org.junit.Test;
import org.neo4j.ogm.config.Configuration;
import org.neo4j.ogm.model.Result;
import org.neo4j.ogm.session.Session;
import org.neo4j.ogm.session.SessionFactory;
import org.testng.Assert;
import java.util.HashMap;
import java.util.Map;
/**
* @author Danil Kornishev (danil.kornishev@mastercard.com)
*/
public class Neo4jOgmTest {
@Test
public void testOgm() {
Configuration conf = new Configuration();
conf.driverConfiguration().setDriverClassName("org.neo4j.ogm.drivers.embedded.driver.EmbeddedDriver");
SessionFactory factory = new SessionFactory(conf, "com.baeldung.graph");
Session session = factory.openSession();
Car tesla = new Car("tesla", "modelS");
Company baeldung = new Company("baeldung");
baeldung.setCar(tesla);
session.save(baeldung);
Map<String, String> params = new HashMap<>();
params.put("make", "tesla");
Result result = session.query("MATCH (car:Car) <-[:owns]- (company:Company)" +
" WHERE car.make=$make" +
" RETURN company", params);
Map<String, Object> firstResult = result.iterator().next();
Assert.assertEquals(firstResult.size(), 1);
Company actual = (Company) firstResult.get("company");
Assert.assertEquals(actual.getName(), baeldung.getName());
}
}

167
core-java/src/test/java/com/baeldung/graph/Neo4jTest.java Normal file
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@ -0,0 +1,167 @@
package com.baeldung.graph;
import java.io.File;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.neo4j.graphdb.GraphDatabaseService;
import org.neo4j.graphdb.Label;
import org.neo4j.graphdb.Node;
import org.neo4j.graphdb.NotFoundException;
import org.neo4j.graphdb.RelationshipType;
import org.neo4j.graphdb.Result;
import org.neo4j.graphdb.factory.GraphDatabaseFactory;
import org.testng.Assert;
public class Neo4jTest {
private static GraphDatabaseService graphDb;
@Before
public void setUp() {
GraphDatabaseFactory graphDbFactory = new GraphDatabaseFactory();
graphDb = graphDbFactory.newEmbeddedDatabase(new File("data/cars"));
}
@After
public void tearDown() {
graphDb.shutdown();
}
@Test
public void testPersonCar() {
graphDb.beginTx();
Node car = graphDb.createNode(Label.label("Car"));
car.setProperty("make", "tesla");
car.setProperty("model", "model3");
Node owner = graphDb.createNode(Label.label("Person"));
owner.setProperty("firstName", "baeldung");
owner.setProperty("lastName", "baeldung");
owner.createRelationshipTo(car, RelationshipType.withName("owner"));
Result result = graphDb.execute("MATCH (c:Car) <-[owner]- (p:Person) " +
"WHERE c.make = 'tesla'" +
"RETURN p.firstName, p.lastName");
Map<String, Object> firstResult = result.next();
Assert.assertEquals("baeldung", firstResult.get("p.firstName"));
}
@Test
public void testCreateNode() {
graphDb.beginTx();
Result result = graphDb.execute("CREATE (baeldung:Company {name:\"Baeldung\"})" +
"RETURN baeldung");
Map<String, Object> firstResult = result.next();
Node firstNode = (Node) firstResult.get("baeldung");
Assert.assertEquals(firstNode.getProperty("name"), "Baeldung");
}
@Test
public void testCreateNodeAndLink() {
graphDb.beginTx();
Result result = graphDb.execute("CREATE (baeldung:Company {name:\"Baeldung\"}) " +
"-[:owns]-> (tesla:Car {make: 'tesla', model: 'modelX'})" +
"RETURN baeldung, tesla");
Map<String, Object> firstResult = result.next();
Assert.assertTrue(firstResult.containsKey("baeldung"));
Assert.assertTrue(firstResult.containsKey("tesla"));
}
@Test
public void testFindAndReturn() {
graphDb.beginTx();
graphDb.execute("CREATE (baeldung:Company {name:\"Baeldung\"}) " +
"-[:owns]-> (tesla:Car {make: 'tesla', model: 'modelX'})" +
"RETURN baeldung, tesla");
Result result = graphDb.execute("MATCH (company:Company)-[:owns]-> (car:Car)" +
"WHERE car.make='tesla' and car.model='modelX'" +
"RETURN company.name");
Map<String, Object> firstResult = result.next();
Assert.assertEquals(firstResult.get("company.name"), "Baeldung");
}
@Test
public void testUpdate() {
graphDb.beginTx();
graphDb.execute("CREATE (baeldung:Company {name:\"Baeldung\"}) " +
"-[:owns]-> (tesla:Car {make: 'tesla', model: 'modelX'})" +
"RETURN baeldung, tesla");
Result result = graphDb.execute("MATCH (car:Car)" +
"WHERE car.make='tesla'" +
" SET car.milage=120" +
" SET car :Car:Electro" +
" SET car.model=NULL" +
" RETURN car");
Map<String, Object> firstResult = result.next();
Node car = (Node) firstResult.get("car");
Assert.assertEquals(car.getProperty("milage"), 120L);
Assert.assertEquals(car.getLabels(), Arrays.asList(Label.label("Car"), Label.label("Electro")));
try {
car.getProperty("model");
Assert.fail();
} catch (NotFoundException e) {
// expected
}
}
@Test
public void testDelete() {
graphDb.beginTx();
graphDb.execute("CREATE (baeldung:Company {name:\"Baeldung\"}) " +
"-[:owns]-> (tesla:Car {make: 'tesla', model: 'modelX'})" +
"RETURN baeldung, tesla");
graphDb.execute("MATCH (company:Company)" +
" WHERE company.name='Baeldung'" +
" DELETE company");
Result result = graphDb.execute("MATCH (company:Company)" +
" WHERE company.name='Baeldung'" +
" RETURN company");
Assert.assertFalse(result.hasNext());
}
@Test
public void testBindings() {
graphDb.beginTx();
Map<String, Object> params = new HashMap<>();
params.put("name", "baeldung");
params.put("make", "tesla");
params.put("model", "modelS");
Result result = graphDb.execute("CREATE (baeldung:Company {name:$name}) " +
"-[:owns]-> (tesla:Car {make: $make, model: $model})" +
"RETURN baeldung, tesla", params);
Map<String, Object> firstResult = result.next();
Assert.assertTrue(firstResult.containsKey("baeldung"));
Assert.assertTrue(firstResult.containsKey("tesla"));
Node car = (Node) firstResult.get("tesla");
Assert.assertEquals(car.getProperty("model"), "modelS");
}
}