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Object-Graph-Mapping with Neo4j-OGM
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‎Neo4j/Neo4J OGM HelloWorld/.classpath‎

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<?xml version="1.0" encoding="UTF-8"?>
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<classpath>
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<classpathentry kind="src" output="target/classes" path="src">
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<attributes>
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<attribute name="optional" value="true"/>
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<attribute name="maven.pomderived" value="true"/>
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</attributes>
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</classpathentry>
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<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/J2SE-1.5">
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<attributes>
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<attribute name="maven.pomderived" value="true"/>
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</attributes>
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</classpathentry>
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<classpathentry kind="con" path="org.eclipse.m2e.MAVEN2_CLASSPATH_CONTAINER">
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<attributes>
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<attribute name="maven.pomderived" value="true"/>
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</attributes>
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</classpathentry>
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<classpathentry kind="output" path="target/classes"/>
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</classpath>

‎Neo4j/Neo4J OGM HelloWorld/.project‎

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<?xml version="1.0" encoding="UTF-8"?>
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<projectDescription>
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<name>Neo4J OGM HelloWorld</name>
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<comment></comment>
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<projects>
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</projects>
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<buildSpec>
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<buildCommand>
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<name>org.eclipse.jdt.core.javabuilder</name>
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<arguments>
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</arguments>
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</buildCommand>
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<buildCommand>
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<name>org.eclipse.m2e.core.maven2Builder</name>
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<arguments>
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</arguments>
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</buildCommand>
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</buildSpec>
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<natures>
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<nature>org.eclipse.m2e.core.maven2Nature</nature>
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<nature>org.eclipse.jdt.core.javanature</nature>
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</natures>
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</projectDescription>

‎Neo4j/Neo4J OGM HelloWorld/.settings/org.eclipse.jdt.core.prefs‎

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eclipse.preferences.version=1
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org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.5
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org.eclipse.jdt.core.compiler.compliance=1.5
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org.eclipse.jdt.core.compiler.problem.forbiddenReference=warning
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org.eclipse.jdt.core.compiler.source=1.5

‎Neo4j/Neo4J OGM HelloWorld/.settings/org.eclipse.m2e.core.prefs‎

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activeProfiles=
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eclipse.preferences.version=1
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resolveWorkspaceProjects=true
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version=1

‎Neo4j/Neo4J OGM HelloWorld/pom.xml‎

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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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<modelVersion>4.0.0</modelVersion>
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<groupId>com.javahelps</groupId>
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<artifactId>Neo4JOGMHelloWorld</artifactId>
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<version>0.0.1-SNAPSHOT</version>
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<build>
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<sourceDirectory>src</sourceDirectory>
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<plugins>
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<plugin>
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<artifactId>maven-compiler-plugin</artifactId>
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<version>3.3</version>
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<configuration>
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<source />
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<target />
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</configuration>
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</plugin>
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</plugins>
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</build>
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<dependencies>
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<dependency>
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<groupId>org.neo4j</groupId>
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<artifactId>neo4j-ogm</artifactId>
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<version>1.1.3</version>
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</dependency>
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</dependencies>
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</project>

‎Neo4j/Neo4J OGM HelloWorld/src/com/javahelps/ogmhelloworld/Main.java‎

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package com.javahelps.ogmhelloworld;
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import java.util.Collections;
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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 com.javahelps.ogmhelloworld.entities.Course;
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import com.javahelps.ogmhelloworld.entities.Student;
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public class Main {
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public static final String NEO4J_URL = "http://localhost:7474";
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public static final String USERNAME = "neo4j";
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public static final String PASSWORD = "admin";
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public static void main(String[] args) {
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// Create SessionFactory. Pass the package name of the entity classes as
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// the argument.
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SessionFactory sessionFactory = new SessionFactory("com.javahelps.ogmhelloworld.entities");
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// Create the session
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Session session = sessionFactory.openSession(NEO4J_URL, USERNAME, PASSWORD);
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// Create few courses
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Course oop = new Course();
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oop.setName("Object Oriented Programming");
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oop.setCredits(2.0f);
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Course algo = new Course();
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algo.setName("Advanced Algorithm");
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algo.setCredits(3.0f);
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Course db = new Course();
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db.setName("Database Internals");
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db.setCredits(3.0f);
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// Create few students
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Student alice = new Student();
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alice.setName("Alice");
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Student bob = new Student();
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bob.setName("Bob");
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Student carol = new Student();
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carol.setName("Carol");
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// Add the courses
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alice.getCourses().add(oop);
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alice.getCourses().add(algo);
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alice.getCourses().add(db);
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bob.getCourses().add(oop);
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bob.getCourses().add(algo);
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carol.getCourses().add(algo);
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carol.getCourses().add(db);
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// Persist the objects. Persisting students persists courses as well.
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session.save(alice);
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session.save(bob);
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session.save(carol);
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// Retrieve Students who enrolled for Advanced Algorithm
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Iterable<Student> students = session.query(Student.class,
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"MATCH (c:Course)<-[:ENROLLED]-(student) WHERE c.name = 'Advanced Algorithm' RETURN student",
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Collections.<String, Object> emptyMap());
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// Print all the Students
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for (Student stu : students) {
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System.out.println(stu.getName());
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}
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}
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}

‎Neo4j/Neo4J OGM HelloWorld/src/com/javahelps/ogmhelloworld/entities/Course.java‎

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package com.javahelps.ogmhelloworld.entities;
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import org.neo4j.ogm.annotation.GraphId;
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import org.neo4j.ogm.annotation.NodeEntity;
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@NodeEntity
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public class Course {
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@GraphId
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private Long id;
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private String name;
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private float credits;
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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 float getCredits() {
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return credits;
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}
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public void setCredits(float credits) {
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this.credits = credits;
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}
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@Override
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public int hashCode() {
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final int prime = 31;
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int result = 1;
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result = prime * result + ((name == null) ? 0 : name.hashCode());
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return result;
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}
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@Override
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public boolean equals(Object obj) {
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if (this == obj)
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return true;
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if (obj == null)
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return false;
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if (getClass() != obj.getClass())
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return false;
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Course other = (Course) obj;
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if (name == null) {
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if (other.name != null)
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return false;
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} else if (!name.equals(other.name))
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return false;
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return true;
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}
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}

‎Neo4j/Neo4J OGM HelloWorld/src/com/javahelps/ogmhelloworld/entities/Student.java‎

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package com.javahelps.ogmhelloworld.entities;
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import java.util.HashSet;
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import java.util.Set;
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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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@NodeEntity
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public class Student {
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@GraphId
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private Long id;
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private String name;
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@Relationship(type = "ENROLLED", direction = Relationship.OUTGOING)
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private Set<Course> courses = new HashSet<Course>();
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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 Set<Course> getCourses() {
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return courses;
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}
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public void setCourses(Set<Course> courses) {
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this.courses = courses;
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}
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@Override
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public int hashCode() {
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final int prime = 31;
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int result = 1;
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result = prime * result + ((name == null) ? 0 : name.hashCode());
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return result;
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}
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@Override
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public boolean equals(Object obj) {
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if (this == obj)
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return true;
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if (obj == null)
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return false;
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if (getClass() != obj.getClass())
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return false;
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Student other = (Student) obj;
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if (name == null) {
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if (other.name != null)
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return false;
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} else if (!name.equals(other.name))
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return false;
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return true;
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}
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}

‎Neo4j/Neo4J OGM HelloWorld/target/classes/META-INF/MANIFEST.MF‎

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Manifest-Version: 1.0
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Built-By: gobinath
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Build-Jdk: 1.8.0_60
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Created-By: Maven Integration for Eclipse
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‎Neo4j/Neo4J OGM HelloWorld/target/classes/META-INF/maven/com.javahelps/Neo4JOGMHelloWorld/pom.properties‎

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#Generated by Maven Integration for Eclipse
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#Tue Oct 27 20:35:58 IST 2015
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version=0.0.1-SNAPSHOT
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groupId=com.javahelps
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m2e.projectName=Neo4J OGM HelloWorld
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m2e.projectLocation=/home/gobinath/Workspace/eclipse/Neo4J OGM HelloWorld
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artifactId=Neo4JOGMHelloWorld

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