springboot整合图像数据库Neo4j

百度百科：　　

　　Neo4j是一个高性能的,NOSQL图形数据库，它将结构化数据存储在网络上而不是表中。它是一个嵌入式的、基于磁盘的、具备完全的事务特性的Java持久化引擎，但是它将结构化数据存储在网络(从数学角度叫做图)上而不是表中。Neo4j也可以被看作是一个高性能的图引擎，该引擎具有成熟数据库的所有特性。程序员工作在一个面向对象的、灵活的网络结构下而不是严格、静态的表中——但是他们可以享受到具备完全的事务特性、企业级的数据库的所有好处。

Neo4j因其嵌入式、高性能、轻量级等优势，越来越受到关注.

查询语句：

　　不是SQL，而是Cypher

Cypher关键点

() 表示节点
[] 表示关系
{} 表示属性
> 表示关系的方向

示例：

//查询a的一个叫duchong的朋友

match (a)-[:Friend]->b

where b.name ='duchong'

return b

一、安装Neo4j

社区版下载地址：

https://neo4j.com/artifact.php?name=neo4j-community-3.4.10-windows.zip

配置环境变量

NEO4J_HOME

Path
%NEO4J_HOME%\bin

配置完成，cmd

neo4j.bat console

启动完成浏览器访问地址为：
localhost:7474
初始用户名和密码均为neo4j

二、springboot整合

添加依赖

<dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-data-neo4j</artifactId>

        </dependency>

properties配置

#neo4j

spring.data.neo4j.uri=http://localhost:7474

spring.data.neo4j.username=neo4j

spring.data.neo4j.password=123qwe

User节点

package com.dc.sb.web.neo4j;

import org.neo4j.ogm.annotation.GraphId;

import org.neo4j.ogm.annotation.NodeEntity;

import org.neo4j.ogm.annotation.Property;

/**

 * 节点实体类型-别名为User

 * @author DUCHONG

 * @since 2018-12-17 11:32

 **/

@NodeEntity(label = "User")

public class UserNode {

    //图形id

    @GraphId

    private Long nodeId;

    //属性

    @Property

    private String userId;

    //属性

    @Property

    private String userName;

    //属性

    @Property

    private int age;

    public Long getNodeId() {

        return nodeId;

    }

    public void setNodeId(Long nodeId) {

        this.nodeId = nodeId;

    }

    public String getUserId() {

        return userId;

    }

    public void setUserId(String userId) {

        this.userId = userId;

    }

    public String getUserName() {

        return userName;

    }

    public void setUserName(String userName) {

        this.userName = userName;

    }

    public int getAge() {

        return age;

    }

    public void setAge(int age) {

        this.age = age;

    }

}

UserRelation节点

package com.dc.sb.web.neo4j;

import org.neo4j.ogm.annotation.EndNode;

import org.neo4j.ogm.annotation.GraphId;

import org.neo4j.ogm.annotation.RelationshipEntity;

import org.neo4j.ogm.annotation.StartNode;

/**

 * 关系节点类型

 * @author DUCHONG

 * @since 2018-12-17 11:39

 **/

@RelationshipEntity(type = "UserRelation")

public class UserRelation {

    @GraphId

    private Long id;

    //开始节点

    @StartNode

    private UserNode startNode;

    //结束节点

    @EndNode

    private EndNode endNode;

    public Long getId() {

        return id;

    }

    public void setId(Long id) {

        this.id = id;

    }

    public UserNode getStartNode() {

        return startNode;

    }

    public void setStartNode(UserNode startNode) {

        this.startNode = startNode;

    }

    public EndNode getEndNode() {

        return endNode;

    }

    public void setEndNode(EndNode endNode) {

        this.endNode = endNode;

    }

}

UserRepository

package com.dc.sb.web.neo4j.dao;

import com.dc.sb.web.neo4j.UserNode;

import org.springframework.data.neo4j.annotation.Query;

import org.springframework.data.neo4j.repository.GraphRepository;

import org.springframework.data.repository.query.Param;

import org.springframework.stereotype.Component;

import java.util.List;

/**

 * @author DUCHONG

 * @since 2018-12-17 11:42

 **/

@Component

public interface UserRepository extends GraphRepository<UserNode> {

    @Query("MATCH (n: User) RETURN n")

    List<UserNode> getUserNodeList();

    @Query("CREATE (n: User{age:{age},userName:{userName}}) RETURN n")

    List<UserNode> addUserNodeList(@Param("userName") String userName, @Param("age") int age);

}

UserReloationReposiroty

package com.dc.sb.web.neo4j.dao;

import com.dc.sb.web.neo4j.UserRelation;

import org.springframework.data.neo4j.annotation.Query;

import org.springframework.data.neo4j.repository.GraphRepository;

import org.springframework.data.repository.query.Param;

import org.springframework.stereotype.Component;

import java.util.List;

/**

 * 用户关系DO

 * @author DUCHONG

 * @since 2018-12-17 13:53

 **/

@Component

public interface UserRelationRepository extends GraphRepository<UserRelation> {

    @Query("match p= (n:User)<- [r: UserRelation]-> (n1:User) wheren.userId=(firstUserId) and n1.userId =(secondUserId) return p")

    List<UserRelation> findUserRelationByEachId (@Param(" firstUserId") String firstUserId, @Param ("secondUserId") String secondUserId) ;

    @Query ("match(fu:User) ,(su:User) where fu. userId=[firstUserId]and su.userId=[ secondUserId, create p= (fu)- [r:UserRelation]-> (su) return p")

    List<UserRelation> addUserRelation (@Param(" firstUserId") String firstUserId, @Param("secondUserId") String secondUserId) ;

}

Service

package com.dc.sb.web.neo4j.service;

import com.dc.sb.web.neo4j.UserNode;

import com.dc.sb.web.neo4j.dao.UserRepository;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.stereotype.Service;

/**

 * @author DUCHONG

 * @since 2018-12-17 14:02

 **/

@Service

public class Neo4jUserService {

    @Autowired

    private UserRepository userRepository;

    public void addUserNode(UserNode userNode){

        userRepository.addUserNodeList(userNode.getUserName(),userNode.getAge());

    }

}

Controller

package com.dc.sb.web.neo4j.controller;

import com.dc.sb.web.neo4j.UserNode;

import com.dc.sb.web.neo4j.service.Neo4jUserService;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RestController;

/**

 * @author DUCHONG

 * @since 2018-12-17 14:14

 **/

@RestController

public class Neo4jController {

    @Autowired

    private Neo4jUserService userService;

    @RequestMapping("/addUserNode")

    public String addUserNode(){

        UserNode userNode=new UserNode();

        userNode.setUserName("duchong");

        userNode.setAge(20);

        userService.addUserNode(userNode);

        return "add success ";

    }

}

浏览器访问localhost:8080/addUserNode

查看Neo4j 数据库

完整代码已托管到GitHub ---》欢迎fork