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
Zeger Hendrikse
parent
92ad8123f1
commit
a9d8c5f3a3
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@ -1,5 +1,5 @@
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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<groupId>com.baeldung</groupId>
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<artifactId>core-java</artifactId>
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@ -10,6 +10,44 @@
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<dependencies>
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<dependency>
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<groupId>org.neo4j</groupId>
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<artifactId>neo4j</artifactId>
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<version>3.1.0</version>
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</dependency>
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<dependency>
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<groupId>org.neo4j.driver</groupId>
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<artifactId>neo4j-java-driver</artifactId>
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<version>1.1.1</version>
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</dependency>
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<dependency>
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<groupId>org.neo4j</groupId>
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<artifactId>neo4j-jdbc-driver</artifactId>
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<version>3.0.1</version>
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</dependency>
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<dependency>
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<groupId>org.neo4j</groupId>
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<artifactId>neo4j-ogm-core</artifactId>
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<version>2.1.1</version>
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</dependency>
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<dependency>
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<groupId>org.neo4j</groupId>
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<artifactId>neo4j-ogm-embedded-driver</artifactId>
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<version>2.1.1</version>
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</dependency>
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<dependency>
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<groupId>com.google.inject</groupId>
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<artifactId>guice</artifactId>
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<version>4.1.0</version>
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<classifier>no_aop</classifier>
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<scope>test</scope>
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</dependency>
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<!-- utils -->
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<dependency>
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<groupId>net.sourceforge.collections</groupId>
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@ -63,7 +101,6 @@
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<artifactId>grep4j</artifactId>
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<version>${grep4j.version}</version>
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</dependency>
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<!-- web -->
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<!-- marshalling -->
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@ -263,7 +300,8 @@
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<configuration>
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<shadedArtifactAttached>true</shadedArtifactAttached>
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<transformers>
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<transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
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<transformer
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implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
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<mainClass>org.baeldung.executable.ExecutableMavenJar</mainClass>
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</transformer>
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</transformers>
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@ -0,0 +1,50 @@
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package com.baeldung.graph;
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import org.neo4j.ogm.annotation.GraphId;
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import org.neo4j.ogm.annotation.NodeEntity;
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import org.neo4j.ogm.annotation.Relationship;
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/**
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* @author Danil Kornishev (danil.kornishev@mastercard.com)
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*/
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@NodeEntity
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public class Car {
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@GraphId
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private Long id;
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private String make;
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@Relationship(direction = "INCOMING")
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private Company company;
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public Car(String make, String model) {
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this.make = make;
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this.model = model;
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}
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public Long getId() {
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return id;
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}
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public void setId(Long id) {
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this.id = id;
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}
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public String getMake() {
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return make;
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}
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public void setMake(String make) {
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this.make = make;
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}
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public String getModel() {
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return model;
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}
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public void setModel(String model) {
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this.model = model;
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}
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private String model;
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}
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@ -0,0 +1,45 @@
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package com.baeldung.graph;
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import org.neo4j.ogm.annotation.NodeEntity;
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import org.neo4j.ogm.annotation.Relationship;
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/**
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* @author Danil Kornishev (danil.kornishev@mastercard.com)
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*/
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@NodeEntity
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public class Company {
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private Long id;
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private String name;
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@Relationship(type="owns")
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private Car car;
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public Company(String name) {
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this.name = name;
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}
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public Long getId() {
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return id;
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}
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public void setId(Long id) {
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this.id = id;
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}
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public String getName() {
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return name;
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}
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public void setName(String name) {
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this.name = name;
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}
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public Car getCar() {
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return car;
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}
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public void setCar(Car car) {
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this.car = car;
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}
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}
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@ -0,0 +1,60 @@
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package com.baeldung.graph;
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import java.sql.Connection;
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import java.sql.DriverManager;
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import java.sql.ResultSet;
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import java.sql.Statement;
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import org.junit.Ignore;
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import org.junit.Test;
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import org.neo4j.driver.v1.AuthTokens;
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import org.neo4j.driver.v1.Driver;
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import org.neo4j.driver.v1.GraphDatabase;
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import org.neo4j.driver.v1.Session;
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import org.neo4j.driver.v1.StatementResult;
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import org.testng.Assert;
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@Ignore
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public class Neo4JServerTest {
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@Test
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public void standAloneDriver() {
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Driver driver = GraphDatabase.driver("bolt://localhost:7687", AuthTokens.basic("neo4j", "12345"));
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Session session = driver.session();
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session.run("CREATE (baeldung:Company {name:\"Baeldung\"}) " +
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"-[:owns]-> (tesla:Car {make: 'tesla', model: 'modelX'})" +
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"RETURN baeldung, tesla");
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StatementResult result = session.run("MATCH (company:Company)-[:owns]-> (car:Car)" +
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"WHERE car.make='tesla' and car.model='modelX'" +
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"RETURN company.name");
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Assert.assertTrue(result.hasNext());
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Assert.assertEquals(result.next().get("company.name").asString(), "Baeldung");
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session.close();
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driver.close();
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}
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@Test
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public void standAloneJdbc() throws Exception {
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Connection con = DriverManager.getConnection("jdbc:neo4j:bolt://localhost/?user=neo4j,password=12345,scheme=basic");
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// Querying
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try (Statement stmt = con.createStatement()) {
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stmt.execute("CREATE (baeldung:Company {name:\"Baeldung\"}) " +
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"-[:owns]-> (tesla:Car {make: 'tesla', model: 'modelX'})" +
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"RETURN baeldung, tesla");
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ResultSet rs = stmt.executeQuery("MATCH (company:Company)-[:owns]-> (car:Car)" +
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"WHERE car.make='tesla' and car.model='modelX'" +
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"RETURN company.name");
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while (rs.next()) {
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Assert.assertEquals(rs.getString("company.name"), "Baeldung");
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}
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}
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con.close();
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}
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}
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@ -0,0 +1,46 @@
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package com.baeldung.graph;
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import org.junit.Test;
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import org.neo4j.ogm.config.Configuration;
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import org.neo4j.ogm.model.Result;
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import org.neo4j.ogm.session.Session;
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import org.neo4j.ogm.session.SessionFactory;
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import org.testng.Assert;
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import java.util.HashMap;
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import java.util.Map;
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/**
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* @author Danil Kornishev (danil.kornishev@mastercard.com)
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*/
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public class Neo4jOgmTest {
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@Test
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public void testOgm() {
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Configuration conf = new Configuration();
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conf.driverConfiguration().setDriverClassName("org.neo4j.ogm.drivers.embedded.driver.EmbeddedDriver");
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SessionFactory factory = new SessionFactory(conf, "com.baeldung.graph");
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Session session = factory.openSession();
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Car tesla = new Car("tesla", "modelS");
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Company baeldung = new Company("baeldung");
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baeldung.setCar(tesla);
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session.save(baeldung);
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Map<String, String> params = new HashMap<>();
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params.put("make", "tesla");
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Result result = session.query("MATCH (car:Car) <-[:owns]- (company:Company)" +
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" WHERE car.make=$make" +
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" RETURN company", params);
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Map<String, Object> firstResult = result.iterator().next();
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Assert.assertEquals(firstResult.size(), 1);
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Company actual = (Company) firstResult.get("company");
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Assert.assertEquals(actual.getName(), baeldung.getName());
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}
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}
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@ -0,0 +1,167 @@
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package com.baeldung.graph;
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import java.io.File;
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import java.util.Arrays;
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import java.util.HashMap;
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import java.util.Map;
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import org.junit.After;
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import org.junit.Before;
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import org.junit.Test;
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import org.neo4j.graphdb.GraphDatabaseService;
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import org.neo4j.graphdb.Label;
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import org.neo4j.graphdb.Node;
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import org.neo4j.graphdb.NotFoundException;
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import org.neo4j.graphdb.RelationshipType;
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import org.neo4j.graphdb.Result;
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import org.neo4j.graphdb.factory.GraphDatabaseFactory;
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import org.testng.Assert;
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public class Neo4jTest {
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private static GraphDatabaseService graphDb;
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@Before
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public void setUp() {
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GraphDatabaseFactory graphDbFactory = new GraphDatabaseFactory();
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graphDb = graphDbFactory.newEmbeddedDatabase(new File("data/cars"));
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}
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@After
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public void tearDown() {
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graphDb.shutdown();
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}
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@Test
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public void testPersonCar() {
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graphDb.beginTx();
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Node car = graphDb.createNode(Label.label("Car"));
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car.setProperty("make", "tesla");
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car.setProperty("model", "model3");
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Node owner = graphDb.createNode(Label.label("Person"));
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owner.setProperty("firstName", "baeldung");
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owner.setProperty("lastName", "baeldung");
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owner.createRelationshipTo(car, RelationshipType.withName("owner"));
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Result result = graphDb.execute("MATCH (c:Car) <-[owner]- (p:Person) " +
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"WHERE c.make = 'tesla'" +
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"RETURN p.firstName, p.lastName");
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Map<String, Object> firstResult = result.next();
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Assert.assertEquals("baeldung", firstResult.get("p.firstName"));
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}
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@Test
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public void testCreateNode() {
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graphDb.beginTx();
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Result result = graphDb.execute("CREATE (baeldung:Company {name:\"Baeldung\"})" +
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"RETURN baeldung");
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Map<String, Object> firstResult = result.next();
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Node firstNode = (Node) firstResult.get("baeldung");
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Assert.assertEquals(firstNode.getProperty("name"), "Baeldung");
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}
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@Test
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public void testCreateNodeAndLink() {
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graphDb.beginTx();
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Result result = graphDb.execute("CREATE (baeldung:Company {name:\"Baeldung\"}) " +
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"-[:owns]-> (tesla:Car {make: 'tesla', model: 'modelX'})" +
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"RETURN baeldung, tesla");
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Map<String, Object> firstResult = result.next();
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Assert.assertTrue(firstResult.containsKey("baeldung"));
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Assert.assertTrue(firstResult.containsKey("tesla"));
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}
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@Test
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public void testFindAndReturn() {
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graphDb.beginTx();
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graphDb.execute("CREATE (baeldung:Company {name:\"Baeldung\"}) " +
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"-[:owns]-> (tesla:Car {make: 'tesla', model: 'modelX'})" +
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"RETURN baeldung, tesla");
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Result result = graphDb.execute("MATCH (company:Company)-[:owns]-> (car:Car)" +
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"WHERE car.make='tesla' and car.model='modelX'" +
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"RETURN company.name");
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Map<String, Object> firstResult = result.next();
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Assert.assertEquals(firstResult.get("company.name"), "Baeldung");
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}
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@Test
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public void testUpdate() {
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graphDb.beginTx();
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graphDb.execute("CREATE (baeldung:Company {name:\"Baeldung\"}) " +
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"-[:owns]-> (tesla:Car {make: 'tesla', model: 'modelX'})" +
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"RETURN baeldung, tesla");
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Result result = graphDb.execute("MATCH (car:Car)" +
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"WHERE car.make='tesla'" +
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" SET car.milage=120" +
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" SET car :Car:Electro" +
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" SET car.model=NULL" +
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" RETURN car");
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Map<String, Object> firstResult = result.next();
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Node car = (Node) firstResult.get("car");
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Assert.assertEquals(car.getProperty("milage"), 120L);
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Assert.assertEquals(car.getLabels(), Arrays.asList(Label.label("Car"), Label.label("Electro")));
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try {
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car.getProperty("model");
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Assert.fail();
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} catch (NotFoundException e) {
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// expected
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}
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}
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@Test
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public void testDelete() {
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graphDb.beginTx();
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graphDb.execute("CREATE (baeldung:Company {name:\"Baeldung\"}) " +
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"-[:owns]-> (tesla:Car {make: 'tesla', model: 'modelX'})" +
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"RETURN baeldung, tesla");
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graphDb.execute("MATCH (company:Company)" +
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" WHERE company.name='Baeldung'" +
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" DELETE company");
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Result result = graphDb.execute("MATCH (company:Company)" +
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" WHERE company.name='Baeldung'" +
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" RETURN company");
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Assert.assertFalse(result.hasNext());
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}
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@Test
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public void testBindings() {
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graphDb.beginTx();
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Map<String, Object> params = new HashMap<>();
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params.put("name", "baeldung");
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params.put("make", "tesla");
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params.put("model", "modelS");
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Result result = graphDb.execute("CREATE (baeldung:Company {name:$name}) " +
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"-[:owns]-> (tesla:Car {make: $make, model: $model})" +
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"RETURN baeldung, tesla", params);
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Map<String, Object> firstResult = result.next();
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Assert.assertTrue(firstResult.containsKey("baeldung"));
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Assert.assertTrue(firstResult.containsKey("tesla"));
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Node car = (Node) firstResult.get("tesla");
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Assert.assertEquals(car.getProperty("model"), "modelS");
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}
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}
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