使用 Java 操作 Neo4J
首先我们先使用原生的这种方式,导入 jar 包,然后:
public class TestController { public static void main(String[] args) { Driver driver = GraphDatabase.driver("bolt://localhost:7687", AuthTokens.basic("neo4j", "Yinlidong1995.")); Session session = driver.session(); session.run("CREATE (n:Part {name: {name},title: {title}})", parameters( "name", "Arthur001", "title", "King001" )); StatementResult result = session.run( "MATCH (a:Part) WHERE a.name = {name} " + "RETURN a.name AS name, a.title AS title", parameters( "name", "Arthur001")); while (result.hasNext()) { Record record = result.next(); System.out.println( record.get( "title" ).asString() + " " + record.get( "name" ).asString() ); } session.close(); driver.close(); } }
这是一种比较古老的方式,来实现的,而且还是需要些 CQL 语句来进行实现。但是胜在非常好理解,这个时候,我们需要再来看看图,看看在 Neo4J 中他是怎么展现的。
通过这个,我们至少证明我们成功连上了,并且创建也成功了。
这时候有细心的读者就会问,为啥我之前在 GraphDatabase.driver
的地方,连接的是
bolt://localhost:7687
.
这是因为,你启动的Neo4J 是7474,也就是说,Neo4J 服务里面可不是这个来连接,
SpringBoot 整合 Neo4j
1.创建SpringBoot项目
常规的创建SpringBoot项目,
创建完成之后,习惯性的要改一下 SpringBoot 的版本号,最好别用最新的,因为阿粉亲身经历,使用最新版的,出现了错误你都不知道怎么出现的,就是这么神奇,你永远都发现不了的bug。
我们把版本号改成2.1.0,这样的话,我们在 pom 文件中加入依赖 jar
<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-neo4j</artifactId> </dependency> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <version>1.16.10</version> </dependency>
2.增加配置
spring: data: neo4j: url: bolt://localhost:7687 username: neo4j password: Yinlidong1995. main: allow-bean-definition-overriding: true
3.Neo4JConfig
package com.example.neo4j.config; 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.springframework.beans.factory.annotation.Value; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.data.neo4j.repository.config.EnableNeo4jRepositories; import org.springframework.transaction.annotation.EnableTransactionManagement; @Configuration@EnableNeo4jRepositories("com.example.neo4j.repository") @EnableTransactionManagement public class Neo4jConfig { @Value("${spring.data.neo4j.url}") private String url; @Value("${spring.data.neo4j.username}") private String userName; @Value("${spring.data.neo4j.password}") private String password; @Bean(name = "session") public Session neo4jSession() { Driver driver = GraphDatabase.driver(url, AuthTokens.basic(userName, password)); return driver.session(); } }
4.编写实体类
package com.example.neo4j.entry; import org.neo4j.ogm.annotation.*; import java.util.HashSet; import java.util.Set; @NodeEntity("group") @Datapublic class GroupNode { @Id @GeneratedValue private Long id; /** * 班级名称 */ @Property(name = "name") private String name; /** * 编号 */ private String num; @Relationship(type = "RelationEdge") private Set<RelationEdge> sets = new HashSet<>(); public void addRelation(StudentNode sonNode, String name) { RelationEdge relationNode = new RelationEdge(this, sonNode, name); sets.add(relationNode); sonNode.getSets().add(relationNode); } }
学生实体类:
package com.example.neo4j.entry; import org.neo4j.ogm.annotation.GeneratedValue; import org.neo4j.ogm.annotation.Id; import org.neo4j.ogm.annotation.NodeEntity; import org.neo4j.ogm.annotation.Relationship; import java.util.HashSet; import java.util.Set; /** * 有点类似于Mysql中的table 映射的对象类,mysql中叫做ORM,neo4j中叫做OGM [object graph mapping] */ @NodeEntity("student") @Datapublic class StudentNode { @Id @GeneratedValue private Long id; /** * 学生名称 */ private String name; /** * 性别 */ private String sex; @Relationship(type = "RelationEdge", direction = "INCOMING") private Set<RelationEdge> sets = new HashSet<>(); }
package com.example.neo4j.entry; import lombok.Data; import org.neo4j.ogm.annotation.*; @RelationshipEntity(type = "RelationEdge") @Datapublic class RelationEdge { @Id @GeneratedValue private Long id; // 关系名 private String name; @StartNode private GroupNode groupNode; @EndNode private StudentNode studentNode; public RelationEdge(GroupNode parentNode, StudentNode sonNode, String name) { this.groupNode = parentNode; this.studentNode = sonNode; this.name = name; } }
5.Repository接口
对应的学生接口:
package com.example.neo4j.repository; import com.example.neo4j.entry.StudentNode; import org.springframework.data.neo4j.repository.Neo4jRepository; public interface StudentRepository extends Neo4jRepository<StudentNode,Long> { }
对应的班级接口
package com.example.neo4j.repository; import com.example.neo4j.entry.GroupNode; import org.springframework.data.neo4j.repository.Neo4jRepository; public interface GroupRepository extends Neo4jRepository<GroupNode,Long> { }
最后完成编写我们的 Controller
package com.example.neo4j.controller; import com.example.neo4j.entry.*; import com.example.neo4j.repository.GroupRepository; import com.example.neo4j.repository.StudentRepository; import lombok.extern.slf4j.Slf4j; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController; @RestController @RequestMapping("/node") @Slf4jpublic class GroupController { @Autowired private StudentRepository studentRepository; @Autowired private GroupRepository groupRepository; @GetMapping(value = "/create") public void createNodeRelation() { StudentNode studentNode1 = new StudentNode(); studentNode1.setName("Alen"); studentNode1.setSex("男"); StudentNode studentNode2 = new StudentNode(); studentNode2.setName("Kai"); studentNode2.setSex("女"); studentRepository.save(studentNode1); studentRepository.save(studentNode2); GroupNode groupNode = new GroupNode(); groupNode.setName("火箭班"); groupNode.setNum("298"); // 增加关系 groupNode.addRelation(studentNode1, "includes"); groupNode.addRelation(studentNode2, "includes"); groupRepository.save(groupNode); } }
启动之后,访问 http://localhost:8080/node/create
我们再去图谱数据库看看。
怎么样,使用Java 操作是不是也是非常简单的呢?这样的图谱数据库你会选择么?
原文地址: https://blog.51cto.com/u_15430445/4845894
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