springboot neo4j的配置代码

neo4j是一个图形数据库，有一个做关系图谱的需求里面需要使用到图形数据库。

w3c教程：https://www.w3cschool.cn/neo4j/

中文版的数据库可以通过image属性显示图片，官网的动画效果是通过3d.js实现的；

pom导入配置

<dependency>
            <groupid>org.springframework.boot</groupid>
            <artifactid>spring-boot-starter-data-neo4j</artifactid>
        </dependency>
 <dependency>
            <groupid>org.neo4j</groupid>
            <artifactid>neo4j-ogm-http-driver</artifactid>
            <version>3.1.4</version>
        </dependency>

配置数据库：

#neo4j
spring.data.neo4j.username=neo4j
spring.data.neo4j.password=123
spring.data.neo4j.uri=http://192.168.100.106:7474
package com.koala.console.configuration;

import org.neo4j.ogm.session.sessionfactory;
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.data.neo4j.transaction.neo4jtransactionmanager;
import org.springframework.transaction.annotation.enabletransactionmanagement;

@configuration
@enableneo4jrepositories(basepackages = "com.koala.console.repository.neo4j")
@enabletransactionmanagement
public class neo4jconfig {

    @value("${bloturi}")
    private string uri;

    @value("${spring.data.neo4j.uri}")
    private string databaseurl;

    @value("${spring.data.neo4j.username}")
    private string username;

    @value("${spring.data.neo4j.password}")
    private string password;

    @bean
    public sessionfactory sessionfactory() {
        org.neo4j.ogm.config.configuration configuration = new org.neo4j.ogm.config.configuration.builder()
                .uri(databaseurl)
                .credentials(username, password)
                .build();
        return new sessionfactory(configuration, "com.koala.console.model.neo4j");
    }

    @bean
    public neo4jtransactionmanager transactionmanager() {
        return new neo4jtransactionmanager(sessionfactory());
    }


}

使用neo4j：

neo4j基本由两部分组成，节点和关系，关系用来指示两个节点的方向和关联属性：

节点bean：

package com.koala.console.model.neo4j;

import com.alibaba.fastjson.annotation.jsonfield;
import com.fasterxml.jackson.annotation.jsonignore;
import com.google.common.collect.lists;
import lombok.data;
import org.neo4j.ogm.annotation.*;
import org.springframework.web.multipart.multipartfile;

import java.util.list;

@data
@nodeentity
public class facenode {

    public facenode() {
    }

    public facenode(string name) {
        this.objid = name;
    }

    @id
    @generatedvalue
    private long id;

    /**
     * objid
     */
    private string objid;


    @jsonfield(serialize = false)
    @jsonignore
    @transient
    private string startname;
    @jsonfield(serialize = false)
    @jsonignore
    @transient
    private string endname;

    @transient
    private integer pathnum;

    @transient
    private string intimacy;

    @property(name = "scenes")
    private string scenes;

    @property(name = "image")
    private string symbol;

    @transient
    private integer[] symbolsize = {60,60};

    @jsonfield(serialize = false)
    @transient
    private multipartfile faceimg;
    @jsonfield(serialize = false)
    @transient
    private string starttime;

    @jsonfield(serialize = false)
    @transient
    private string endtime;



    @relationship(type = "relation")
    private list<facenodepro> facenodepros = lists.newarraylist();

    private list<facenode>  children = lists.newarraylist();

    public void addendnode(facenode endnode, string title) {
        facenodepro pro = new facenodepro(title, this, endnode);
        this.facenodepros.add(pro);
    }

    public void addstartnode(facenode startnode, string title) {
        facenodepro pro = new facenodepro(title, startnode, this);
        this.facenodepros.add(pro);
    }

    public long getid() {
        return id;
    }

    public void setid(long id) {
        this.id = id;
    }

    public string getobjid() {
        return objid;
    }

    public void setobjid(string objid) {
        this.objid = objid;
    }

    public string getsymbol() {
        return symbol;
    }

    public void setsymbol(string symbol) {
        this.symbol = symbol;
    }

    public list<facenodepro> getfacenodepros() {
        return facenodepros;
    }

    public void setfacenodepros(list<facenodepro> facenodepros) {
        this.facenodepros = facenodepros;
    }

    public string getstartname() {
        return startname;
    }

    public void setstartname(string startname) {
        this.startname = startname;
    }

    public string getendname() {
        return endname;
    }

    public void setendname(string endname) {
        this.endname = endname;
    }

    public multipartfile getfaceimg() {
        return faceimg;
    }

    public void setfaceimg(multipartfile faceimg) {
        this.faceimg = faceimg;
    }

    public string getstarttime() {
        return starttime;
    }

    public void setstarttime(string starttime) {
        this.starttime = starttime;
    }

    public string getendtime() {
        return endtime;
    }

    public void setendtime(string endtime) {
        this.endtime = endtime;
    }

    public string getscenes() {
        return scenes;
    }

    public void setscenes(string scenes) {
        this.scenes = scenes;
    }
}

关系bean：

package com.koala.console.model.neo4j;

import com.fasterxml.jackson.annotation.jsonbackreference;
import org.neo4j.ogm.annotation.*;

@relationshipentity(type = "relation")
public class facenodepro {

    public facenodepro() {
    }

    public facenodepro(string intimacy, facenode startnode, facenode endnode) {
        this.intimacy = intimacy;
        this.startnode = startnode;
        this.endnode = endnode;
    }

    @id
    @generatedvalue
    private long nodeproid;

    /**
     * 亲密度
     */
    @property
    private string intimacy;

    @jsonbackreference
    @startnode
    private facenode startnode;

    @endnode
    private facenode endnode;

    public long getnodeproid() {
        return nodeproid;
    }

    public void setnodeproid(long nodeproid) {
        this.nodeproid = nodeproid;
    }

    public string getintimacy() {
        return intimacy;
    }

    public void setintimacy(string intimacy) {
        this.intimacy = intimacy;
    }

    public facenode getstartnode() {
        return startnode;
    }

    public void setstartnode(facenode startnode) {
        this.startnode = startnode;
    }

    public facenode getendnode() {
        return endnode;
    }

    public void setendnode(facenode endnode) {
        this.endnode = endnode;
    }
}

repository实现：

@repository
public interface facenoderepository extends neo4jrepository<facenode, long> {

    facenode findbyobjid(@param("objid") string objid);

    /**
     * 查询节点node指定层级的图
     *
     * @param
     * @return
     */
    @query(value = "match n=(:facenode{objid:{objid}})-[*..6]->() return n")
    list<facenode> findbyhierarchical(@param("objid") string objid);

}

剩下的使用都是很简单的事情。

我收集了一些会使用到的语句：

查询节点node所有的关系
match(node{name:'5c26219bd3e2dca5322110bb'})-[:played_in]->(yf)return node,yf
查询节点node的2层关系图
match n=(:node{name:"5c262177d3e2dca5322110b3"})-[*..1]-() return n
两个陌生人之间的所有最短认识路径
match n = allshortestpaths((小讯:朋友圈{姓名:"小讯"})-[*..6]-(小菲:朋友圈{姓名:"小菲"})) return n
查询节点node指向的所有节点
match (:node { name: '5c262137d3e2dca5322110a7' })-->(movie)return movie;
查询标签node所有节点
match(n)--(m:node)return n;
批量创建node节点的朋友圈
match (node:node {name:"4j2ap"})foreach (name in ["johan","rajesh","anna","julia","andrew"] |create (node)-[:friend]->(:person {name:name}))
查询两个节点有向关系条数
match (:facenode{name:"gong"})-[r:played_in]->(:facenode{name:"eza2e"})return count(r)

参考：

转载自：https://www.cxymm.net/article/sinat_21184471/87092034
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本文链接：https://blog.csdn.net/sinat_21184471/article/details/87092034

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