Neo4j的JavaAPI

Neo4j的JavaAPI的使用

1. 创建空的maven项目
2. 引入驱动依赖

<dependency>
    <groupId>org.neo4j.driver</groupId>
    <artifactId>neo4j-java-driver</artifactId>
    <version>5.7.0</version>
</dependency>

3. 编写测试

注意：最新版本的驱动需要JDK17

• 创建节点

public class App {
    private static final Driver driver;

    static {
        driver = GraphDatabase.driver("bolt://localhost:7687", AuthTokens.basic("neo4j", "Aa111111"));
    }

    public static void main(String[] args) {
        try {
            // 创建节点
            create();
            create("test");
        } finally {
            driver.close();
        }
    }

    /**
     * 创建节点
     */
    public static void create() {
        try (Session session = driver.session()){
            int r = session.executeWrite(tx -> {
                Query query = new Query("CREATE (n:Person {name: 'Tom Hanks'}) return id(n)");
                Result result = tx.run(query);
                return result.single().get(0).asInt();
            });
            System.out.println(r);
        }
    }

    /**
     * 创建节点包含参数
     */
    public static void create(String name) {
        try (Session session = driver.session()){
            int r = session.executeWrite(tx -> {
                Query query = new Query("CREATE (n:Person {name: $name}) return id(n)", parameters("name", name));
                Result result = tx.run(query);
                return result.single().get(0).asInt();
            });
            System.out.println(r);
        }
    }
}

• 创建关系

public static void createRelation() {
    try (Session session = driver.session()) {
        String r = session.executeWrite(tx -> {
            Query query = new Query("match (n1:Person), (n2:Person) where n1.name = 'zhangsan' and n2.name='lisi' create (n1)<-[r:Friend]-(n2) return r");
            Result result = tx.run(query);
            return result.single().get(0).asMap().toString();
        });
        System.out.println(r);
    }
}

• 查询节点

public static List<String> queryPersonNames() {
    try (Session session = driver.session()) {
        return session.readTransaction(tx -> {
            Query query = new Query("MATCH (n:Person) RETURN n.name");
            Result result = tx.run(query);
            List<String> names = result.stream()
                    .map(r -> r.get(0).asString())
                    .collect(Collectors.toList());
            System.out.println(names);
            return names;
        });
    }
}

• 删除节点

public static void delete() {
    try (Session session = driver.session()) {
        int r = session.executeWrite(tx -> {
            Query query = new Query("match(p:Pet) delete p return id(p) ");
            Result result = tx.run(query);
            return result.single().get(0).asInt();
        });
        System.out.println(r);
    }
}