04-SpringBoot集成Nebula Graph

彼岸舞

发布于 2022-08-24 08:32:10

7530

发布于 2022-08-24 08:32:10

SpringBoot集成Nebula

建议模块

在这里给大家推荐一种方式, 每引入一种新的技术,建议新建一个模块, 来适配这种技术,对外提供接口,在调用的地方应用就可以, 不用搞的到处都是, 防止如果后续替换这种技术, 还要到处修改, 这样的话, 只需要增加一个模块, 对外提供一样的接口, 并替换依赖就可以

添加Maven依赖

<dependency>
  <groupId>com.vesoft</groupId>
  <artifactId>client</artifactId>
  <version>3.0.0</version>
</dependency>
<dependency>
  <groupId>com.alibaba</groupId>
  <artifactId>fastjson</artifactId>
  <version>1.2.83</version>
</dependency>

配合FastJson一起用比较方便, 为了解决fastjson漏洞问题, 使用1.2.83及其以上版本

增加yml配置

nebula:
  address[0]:
    host: 192.168.247.130
    port: 9669
  username: root
  password: 123456
  reconnect: false
  space: knowledge_extraction_platform

address[0]: 因为是开发, 所以配置为单机的, 等部署生产的话, 可以增加address[1-..]来完成集群的配置

space: 图空间

新增配置类

主机和端口

package com.jd.knowledgeextractionplatform.nebulagraph.config;

import lombok.Data;

@Data
public class NebulaAddress {
    private String host;
    private Integer port;
}

解析配置文件的模型

package com.jd.knowledgeextractionplatform.nebulagraph.config;

import lombok.Data;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Configuration;
import org.springframework.stereotype.Component;

import java.util.List;

@Data
@Configuration
@ConfigurationProperties(prefix = "nebula")
public class NebulaProperties {
    private List<NebulaAddress> address;
    private String username;
    private String password;
    private boolean reconnect;
    private String space;
}

基于配置初始化会话和连接池

package com.jd.knowledgeextractionplatform.nebulagraph.config;

import com.jd.knowledgeextractionplatform.nebulagraph.constant.NebulaConstant;
import com.sun.javafx.binding.StringFormatter;
import com.vesoft.nebula.client.graph.NebulaPoolConfig;
import com.vesoft.nebula.client.graph.data.HostAddress;
import com.vesoft.nebula.client.graph.net.NebulaPool;
import com.vesoft.nebula.client.graph.net.Session;
import lombok.extern.slf4j.Slf4j;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Scope;
import org.springframework.context.annotation.ScopedProxyMode;

import java.util.stream.Collectors;

@Slf4j
@Configuration
public class NebulaConfig {
    
    @Bean
    public NebulaPool nebulaPool(NebulaProperties nebulaProperties) throws Exception {
        NebulaPool pool = new NebulaPool();
        NebulaPoolConfig nebulaPoolConfig = new NebulaPoolConfig();
        nebulaPoolConfig.setMaxConnSize(1000);
        boolean init = pool.init(nebulaProperties.getAddress().stream().map(d -> new HostAddress(d.getHost(), d.getPort())).collect(Collectors.toList()), nebulaPoolConfig);
        if (!init){
            throw new RuntimeException("NebulaGraph init err !");
        }else {
            log.info("NebulaGraph init Success ！");
        }
        return pool;
    }
    
    @Bean
    @Scope(scopeName = "prototype",proxyMode = ScopedProxyMode.TARGET_CLASS)
    public Session session(NebulaPool nebulaPool, NebulaProperties nebulaProperties) {
        try {
            Session session = nebulaPool.getSession(nebulaProperties.getUsername(), nebulaProperties.getPassword(), nebulaProperties.isReconnect());
            session.execute(StringFormatter.concat(NebulaConstant.USE, nebulaProperties.getSpace(), NebulaConstant.SEMICOLON).getValue());
            return session;
        } catch (Exception e) {
            log.error("get nebula session err , {} ", e.toString());
        }
        return null;
    }
}

常用常量(用于返回结果)

package com.jd.knowledgeextractionplatform.nebulagraph.constant;

import lombok.AllArgsConstructor;
import lombok.Getter;

public class NebulaConstant {
    public static final String USE = "USE ";
    public static final String SEMICOLON = "; ";
    public static final String ERROR_CODE = "-1";

    @Getter
    @AllArgsConstructor
    public enum NebulaJson{
        ERRORS("errors"),
        CODE("code"),
        MESSAGE("message"),
        RESULTS("results"),
        COLUMNS("columns"),
        DATA("data"),
        ROW("row");
        private String key;
    }
}

图数据库通用返回结果

package com.jd.knowledgeextractionplatform.nebulagraph.result;

import lombok.Data;

import java.util.List;

@Data
public class NebulaResult<T> {
    private Integer code;
    private String message;
    private List<T> data;

    public boolean isSuccessed(){
        return code == 0;
    }
}

为了防止每次都解析图数据库返回的结果,增加Template

package com.jd.knowledgeextractionplatform.nebulagraph.template;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;
import com.jd.knowledgeextractionplatform.nebulagraph.constant.NebulaConstant;
import com.jd.knowledgeextractionplatform.nebulagraph.result.NebulaResult;
import com.vesoft.nebula.client.graph.data.ResultSet;
import com.vesoft.nebula.client.graph.exception.IOErrorException;
import com.vesoft.nebula.client.graph.net.Session;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;
import java.util.*;
import java.util.stream.Collectors;

@Slf4j
@Component
public class NebulaTemplate {

    @Resource
    Session session;

    public <T> NebulaResult<T> queryObject(String stmt, Class<T> tClass) {
        NebulaResult<T> nebulaResult = executeObject(stmt);
        if (Objects.isNull(nebulaResult.getData())) {
            return nebulaResult;
        }
        Optional.ofNullable(nebulaResult.getData()).ifPresent(data -> nebulaResult.setData(data.stream().map(d -> JSONObject.toJavaObject(((JSONObject) d), tClass)).collect(Collectors.toList())));
        return nebulaResult;
    }

    public NebulaResult executeObject(String stmt) {
        JSONObject jsonObject = executeJson(stmt);
        return JSONObject.toJavaObject(jsonObject, NebulaResult.class);
    }

    public JSONObject executeJson(String stmt) {
        JSONObject restJson = new JSONObject();
        try {
            JSONObject jsonObject = JSON.parseObject(Objects.requireNonNull(session).executeJson(stmt));
            JSONObject errors = jsonObject.getJSONArray(NebulaConstant.NebulaJson.ERRORS.getKey()).getJSONObject(0);
            restJson.put(NebulaConstant.NebulaJson.CODE.getKey(), errors.getInteger(NebulaConstant.NebulaJson.CODE.getKey()));
            if (errors.getInteger(NebulaConstant.NebulaJson.CODE.getKey()) != 0) {
                restJson.put(NebulaConstant.NebulaJson.MESSAGE.getKey(), errors.getString(NebulaConstant.NebulaJson.MESSAGE.getKey()));
                return restJson;
            }
            JSONObject results = jsonObject.getJSONArray(NebulaConstant.NebulaJson.RESULTS.getKey()).getJSONObject(0);
            JSONArray columns = results.getJSONArray(NebulaConstant.NebulaJson.COLUMNS.getKey());
            if (Objects.isNull(columns)) {
                return restJson;
            }
            JSONArray data = results.getJSONArray(NebulaConstant.NebulaJson.DATA.getKey());
            if (Objects.isNull(data)) {
                return restJson;
            }
            List<JSONObject> resultList = new ArrayList<>();
            data.stream().map(d -> (JSONObject) d).forEach(d -> {
                JSONArray row = d.getJSONArray(NebulaConstant.NebulaJson.ROW.getKey());
                JSONObject map = new JSONObject();
                for (int i = 0; i < columns.size(); i++) {
                    map.put(columns.getString(i), row.get(i));
                }
                resultList.add(map);
            });
            restJson.put(NebulaConstant.NebulaJson.DATA.getKey(), resultList);
        } catch (Exception e) {
            restJson.put(NebulaConstant.NebulaJson.CODE.getKey(), NebulaConstant.ERROR_CODE);
            restJson.put(NebulaConstant.NebulaJson.MESSAGE.getKey(), e.toString());
            log.error("nebula execute err：", e);
        }
        return restJson;
    }
}

使用

在Service中引入依赖

为了放置每次都构建nGQL, 虽然灵活, 但是使用困难较大, 有学习成本, 我建立了一个SqlBuildUtils的工具类

扩展

引入SqlBuild

package com.jd.knowledgeextractionplatform.nebulagraph.utils;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

import javax.validation.constraints.NotNull;

@Data
@AllArgsConstructor
@NoArgsConstructor
public class SqlBuild {

    private Long id;

    private String name;

    private String field;

    private String values;

}

引入SqlBuildUtils

package com.jd.knowledgeextractionplatform.nebulagraph.utils;

import com.jd.knowledgeextractionplatform.nebulagraph.annotation.ClassAutoMapping;
import com.jd.knowledgeextractionplatform.nebulagraph.annotation.FieldAutoMapping;
import com.jd.knowledgeextractionplatform.nebulagraph.model.Edge;
import com.jd.knowledgeextractionplatform.nebulagraph.model.ModelAndClass;
import com.jd.knowledgeextractionplatform.nebulagraph.model.ProjectModelAndClass;
import org.springframework.stereotype.Component;

import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Locale;

@Component
public class SqlBuildUtils {

    private static final String methodPre = "get";

    private static final String insertTagSqlTemplate = "insert vertex %s(%s) values \"%s\":(%s);";

    private static final String insertEdgeSqlTemplate = "insert edge %s(%s) values \"%s\" -> \"%s\":(%s);";

    private static final String deleteTagSqlTemplate = "delete tag %s from \"%s\";";

    private static final String deleteEdgeSqlTemplate = "delete edge %s \"%s\" -> \"%s\"@0;";

    private static final String deleteVertexSqlTemplate = "delete vertex \"%s\" with edge;";

    private static final String updateVertexSqlTemplate = "update vertex on %s \"%s\" set %s;";

    private static final String createTag = "create tag if not exists %s(id int64, name String,description String) comment = \"%s\";";

    private static final String insertDefaultVertex = "insert vertex if not exists %s(id,name,description) values \"%s\":(%s,\"%s\",\"%s\");";

    private static final String insertDefaultEdge = "insert edge %s(id,name) values \"%s\" -> \"%s\":(%s,\"%s\");";

    private static final String dropTagSqlTemplate = "drop tag if exists %s;";

    private static final String dropEdgeSqlTemplate = "drop edge if exists %s;";

    private static final String createEdgeSqlTemplate = "create edge if not exists %s(id int64,name String) comment = \"%s\"";

    public static <T> String buildInsert(T t) throws NoSuchMethodException, InvocationTargetException, IllegalAccessException {
        SqlBuild tag = parse(t);
        return String.format(insertTagSqlTemplate, tag.getName(), tag.getField(), tag.getId(), tag.getValues());
    }

    public static <T extends Edge> String buildEdge(T t) throws NoSuchMethodException, InvocationTargetException, IllegalAccessException {
        SqlBuild edge = parse(t);
        return String.format(insertEdgeSqlTemplate, edge.getName(), edge.getField(), t.getLeftVid(), t.getRightVid(), edge.getValues());
    }

    public static <T> String deleteTag(T t) throws InvocationTargetException, NoSuchMethodException, IllegalAccessException {
        SqlBuild tag = parse(t);
        return String.format(deleteTagSqlTemplate,tag.getName(),tag.getId());
    }

    public static String deleteEdge(String edgeName, Long pid, Long subId){
        return String.format(deleteEdgeSqlTemplate,edgeName,pid,subId);
    }

    public static <T> String deleteVertex(Long id){
        return String.format(deleteVertexSqlTemplate,id);
    }

    public static <T> String updateVertex(T t) throws InvocationTargetException, NoSuchMethodException, IllegalAccessException {
        Class<?> clazz = t.getClass();
        ClassAutoMapping annotation = clazz.getAnnotation(ClassAutoMapping.class);
        String tagName = annotation.value();
        Field[] declaredFields = clazz.getDeclaredFields();
        StringBuilder set = new StringBuilder();
        Long id = null;
        for (int i = 0; i < declaredFields.length; i++) {
            Field declaredField = declaredFields[i];
            // 获取属性名称
            String name = declaredField.getName();
            // 获取自定义注解 FieldAutoMapping
            FieldAutoMapping autoMapping = declaredField.getAnnotation(FieldAutoMapping.class);
            if(null == autoMapping){
                continue;
            }
            String methodName = autoMapping.method();
            String type = autoMapping.type();
            Method getMethod = clazz.getDeclaredMethod(methodName);
            Object value = getMethod.invoke(t);
            Object valueFormat = format(value, type);
            if ("id".equals(name)) {
                id = (Long) value;
                continue;
            }
            set.append(name).append("=").append(valueFormat);
            if (i != declaredFields.length - 1) {
                set.append(",");
            }
        }
        return String.format(updateVertexSqlTemplate,tagName,id,set.toString());
    }

    public static String updateDefault(String tagName,Long vid,String name, String description){
        String setCall = "name="+format(name,"String")+",description="+format(description,"String");
        return String.format(updateVertexSqlTemplate,tagName,vid,setCall);
    }

    private static <T> SqlBuild parse(T t) throws NoSuchMethodException, InvocationTargetException, IllegalAccessException {
        Class<?> clazz = t.getClass();
        ClassAutoMapping annotation = clazz.getAnnotation(ClassAutoMapping.class);
        String tagName = annotation.value();
        Field[] declaredFields = clazz.getDeclaredFields();
        StringBuilder filedString = new StringBuilder();
        StringBuilder valueString = new StringBuilder();
        Long id = null;
        for (int i = 0; i < declaredFields.length; i++) {
            Field declaredField = declaredFields[i];
            // 获取属性名称
            String name = declaredField.getName();
            // 获取自定义注解 FieldAutoMapping
            FieldAutoMapping autoMapping = declaredField.getAnnotation(FieldAutoMapping.class);
            if(null == autoMapping){
                continue;
            }
            String methodName = autoMapping.method();
            String type = autoMapping.type();
            Method getMethod = clazz.getDeclaredMethod(methodName);
            Object value = getMethod.invoke(t);
            filedString.append(name);
            Object valueFormat = format(value, type);
            if ("id".equals(name)) {
                id = (Long) value;
            }
            valueString.append(valueFormat);
            if (i != declaredFields.length - 1) {
                filedString.append(",");
                valueString.append(",");
            }
        }
        return new SqlBuild(id,tagName,filedString.toString(),valueString.toString());
    }

    public static String createTag(String tagName,String comment){
        return String.format(createTag,tagName,comment);
    }

    public static String createEdge(String edgeName,String comment){
        return String.format(createEdgeSqlTemplate,edgeName,comment);
    }

    public static String insertDefaultVertex(String tagName,Long vid,String name,String description){
        return String.format(insertDefaultVertex,tagName,vid,vid,name,description);
    }

    public static String dropTag(String tagName){
        return String.format(dropTagSqlTemplate,tagName);
    }

    public static String dropEdge(String edgeName){
        return String.format(dropEdgeSqlTemplate,edgeName);
    }

    public static String insertDefaultEdge(String edgeCode,Long pid,Long id,Long preId,String edgeName){
        return String.format(insertDefaultEdge,edgeCode,pid,id,preId,edgeName);
    }

    /**
     * 首字母转大写
     *
     * @param name 字符串
     * @return 转大写
     */
    private static String firstCharacterToUppercase(String name) {
        String startName = name.substring(0, 1);
        String endName = name.substring(1);
        return startName.toUpperCase(Locale.ROOT) + endName;
    }

    private static Object format(Object value, String type) {
        if ("String".equals(type)) {
            String s = value + "";
            return "\"" + s + "\"";
        }
        return value;
    }

    public static void main(String[] args) throws InvocationTargetException, NoSuchMethodException, IllegalAccessException {
        // 测试点生成
        ModelAndClass modelAndClass = new ModelAndClass();
        modelAndClass.setId(123123123123L);
        modelAndClass.setName("模式");
        modelAndClass.setPid(132313231313123L);
        modelAndClass.setDescription("描述");
        String s = buildInsert(modelAndClass);
        System.out.println(s);
        // 测试边生成
        ProjectModelAndClass projectModelAndClass = new ProjectModelAndClass();
        projectModelAndClass.setStartId(181314024706908160L);
        projectModelAndClass.setEndId(123123123123L);
        projectModelAndClass.setLeftVid("181314024706908160");
        projectModelAndClass.setRightVid("123123123123");
        String s1 = buildEdge(projectModelAndClass);
        System.out.println(s1);
    }

}

引入注解

类注解

package com.jd.knowledgeextractionplatform.nebulagraph.annotation;

import java.lang.annotation.*;

@Documented
@Target({ElementType.TYPE,ElementType.FIELD})
@Retention(RetentionPolicy.RUNTIME)
public @interface ClassAutoMapping {

    String value() default "";

}

字段注解

package com.jd.knowledgeextractionplatform.nebulagraph.annotation;

import java.lang.annotation.*;

@Documented
@Target({ElementType.TYPE,ElementType.FIELD})
@Retention(RetentionPolicy.RUNTIME)
public @interface FieldAutoMapping {

    String method() default "";

    String type();

}

引入边的通用属性

package com.jd.knowledgeextractionplatform.nebulagraph.model;

import lombok.Data;

@Data
public class Edge {

    private String leftVid;

    private String rightVid;

}

使用方式

节点使用方式

在节点类上增加注解

package com.jd.knowledgeextractionplatform.nebulagraph.model;

import com.jd.knowledgeextractionplatform.nebulagraph.annotation.ClassAutoMapping;
import com.jd.knowledgeextractionplatform.nebulagraph.annotation.FieldAutoMapping;
import lombok.Data;

import java.io.Serializable;

@Data
@ClassAutoMapping("modelandclass")
public class ModelAndClass implements Serializable {

    /**
     * id vid
     */
    @FieldAutoMapping(method = "getId", type = "Long")
    private Long id;

    /**
     * 父级ID
     */
    @FieldAutoMapping(method = "getPid", type = "Long")
    private Long pid;/**
     * 名称
     */
    @FieldAutoMapping(method = "getName", type = "String")
    private String name;

    /**
     * 描述
     */
    @FieldAutoMapping(method = "getDescription", type = "String")
    private String description;

}

边使用方式

增加注解并继承边的通用属性

package com.jd.knowledgeextractionplatform.nebulagraph.model;

import com.jd.knowledgeextractionplatform.nebulagraph.annotation.ClassAutoMapping;
import com.jd.knowledgeextractionplatform.nebulagraph.annotation.FieldAutoMapping;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

import java.io.Serializable;

@Data
@AllArgsConstructor
@NoArgsConstructor
@ClassAutoMapping("project_attributeandrelationship")
public class ProjectAttributeAndRelationship extends Edge implements Serializable {

    @FieldAutoMapping(method = "getStartId",type = "Long")
    private Long startId;

    @FieldAutoMapping(method = "getEndId",type = "Long")
    private Long endId;

}

剩余的在Controller中传入模型的数据就可以了

其他Demo[直接写NGQL]

@RestController
public class TestController {

    @Resource
    NebulaTemplate nebulaTemplate;

    @GetMapping("/addVertex")
    public Object addJSON() throws IOErrorException {
        String sql = "insert vertex team(team_name, persion_num) values \"team_2\":(\"team_2\", 43);";
        NebulaResult nebulaResult = nebulaTemplate.executeObject(sql);
        return nebulaResult;
    }

    @GetMapping("/findVertex")
    public Object findJson2() throws IOErrorException {
        String sql = "lookup on team  yield id(vertex) AS id,properties(vertex).persion_num AS persion_num,properties(vertex).team_name AS team_name;";
        NebulaResult<Info> infoNebulaResult = nebulaTemplate.queryObject(sql, Info.class);
        return infoNebulaResult;
    }
}

查询的语句, 要自己写, 这个SqlBuildUtils只能统一解决节点tag和边edge的增删改问题

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原始发表：2022-08-23，如有侵权请联系 cloudcommunity@tencent.com 删除

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