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SpringBoot结合Neo4j自定义cypherSql的方法

2024-04-02 19:04:59 433人浏览独家记忆

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摘要

前言 SpringBoot引入neo4j <dependency> <groupId>org.springframework.b

前言

SpringBoot引入neo4j


 <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-neo4j</artifactId>
        </dependency>


<spring.boot.version>2.2.11.RELEASE</spring.boot.version>

大多数时候Neo4j结合springboot都是按照实体类的映射，进行对象形式的创建节点，导致了节点属性的不可配性。结合这种问题，结合目前开发经验，可以使用neo4j 框架的session 进行原生cyphersql的执行。所以结合使用session进行动态可配等思路，建立一个Neo4jUtil..

Neo4jUtil作用

SpringBoot结合neo4j,自定义封装cypherSql进行操作。实际就是使用neo4j的Session.执行一些cypherSql操作，然后封装了一些方法供大家在既可以使用springboot的对象化操作方式的前提创建节点或者关系，也可以自定义继续封装一些特殊需求的方法，避免大家造轮子。

相关代码

application.yml


spring: 
    data:
        neo4j:
          uri: bolt://127.0.0.1:7688
          username: neo4j
          passWord: neo4j

config


package com.troy.keeper.modules.desk.config;

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;

@Configuration
@EnableNeo4jRepositories("com.troy.keeper.desc.repository") // 声明neo4j repository存放地址
public class Neo4jConfig {

    @Value("${spring.data.neo4j.uri}")
    private String uri;
    @Value("${spring.data.neo4j.username}")
    private String userName;
    @Value("${spring.data.neo4j.password}")
    private String password;

    @Bean
    public org.neo4j.ogm.config.Configuration getConfiguration() {
        org.neo4j.ogm.config.Configuration configuration = new org.neo4j.ogm.config.Configuration.Builder().uri(uri).connectionPoolSize(100).credentials(userName, password).witHBasePackages("com.troy.keeper.desc.repository").build();
        return configuration;
    }

    @Bean
    public SessionFactory sessionFactory() {
        return new SessionFactory(getConfiguration());
    }

    @Bean("neo4jTransaction")
    public Neo4jTransactionManager neo4jTransactionManager(SessionFactory sessionFactory) {
        return new Neo4jTransactionManager(sessionFactory);
    }
}

Entity

Neo4jBasicnode


//节点实体类
package com.troy.keeper.modules.desk.entity.neo4j;

import lombok.Data;

import java.io.Serializable;
import java.util.List;
import java.util.Map;


@Data
public class Neo4jBasicNode implements Serializable {
    private static final long serialVersionUID = 1L;
    
    private Long id;

    
    private List<String> labels;

    
    private Map<String, Object> property;


}

Neo4jBaiscRelation


//关系实体类
package com.troy.keeper.modules.desk.entity.neo4j;

import lombok.Data;

import java.io.Serializable;
import java.util.Map;


@Data
public class Neo4jBaiscRelation implements Serializable {

    private static final long serialVersionUID = 1L;
    
    private Long id;

    
    private String type;

    
    private Map<String, Object> property;
}

Neo4JqueryRelation


//查询关系的时候返回的对象封装的实体类
package com.troy.keeper.modules.desk.entity.neo4j;

import lombok.Data;

import java.io.Serializable;
import java.util.Map;


@Data
public class Neo4jQueryRelation implements Serializable {

    private static final long serialVersionUID = 1L;
    
    private Long start;
    
    private Long end;
    
    private String type;
    
    private Long id;

    
    private Map<String, Object> property;
}

Neo4jBasicRelationReturnVO


package com.troy.keeper.modules.desk.vo.neo4j;

import com.troy.keeper.modules.desk.entity.neo4j.Neo4jBasicNode;
import com.troy.keeper.modules.desk.entity.neo4j.Neo4jQueryRelation;
import lombok.Data;

import java.io.Serializable;


@Data
public class Neo4jBasicRelationReturnVO implements Serializable {
    private static final long serialVersionUID = 1L;

    private Neo4jBasicNode start;
    private Neo4jQueryRelation relationship;
    private Neo4jBasicNode end;
}

RelationVO


package com.troy.keeper.modules.desk.vo.neo4j;

import lombok.Data;


@Data
public class RelationVO {
    
    private String relationLabelName;
    
    private String startLabelName;

    
    private String startNodeProperties;
    
    private String relationProperties;
    
    private String endNodeProperties;
    
    private String endLabelName;
    
    private String level;
}

Util

Neo4jUtil


package com.troy.keeper.modules.desk.util;

import com.fasterxml.jackson.core.JSONGenerator;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.troy.keeper.core.tool.utils.BeanUtil;
import com.troy.keeper.core.tool.utils.Func;
import com.troy.keeper.modules.desk.dto.neo4j.Neo4jsaveRelationDTO;
import com.troy.keeper.modules.desk.dto.neo4j.RelationDTO;
import com.troy.keeper.modules.desk.entity.neo4j.Neo4jBaiscRelation;
import com.troy.keeper.modules.desk.entity.neo4j.Neo4jBasicNode;
import com.troy.keeper.modules.desk.entity.neo4j.Neo4jQueryRelation;
import com.troy.keeper.modules.desk.vo.neo4j.Neo4jBasicRelationReturnVO;
import com.troy.keeper.modules.desk.vo.neo4j.RelationVO;
import lombok.SneakyThrows;
import org.apache.commons.collections.IteratorUtils;
import org.apache.commons.lang3.StringUtils;
import org.neo4j.driver.internal.InternalPath;
import org.neo4j.driver.types.Node;
import org.neo4j.driver.types.Relationship;
import org.neo4j.ogm.model.Property;
import org.neo4j.ogm.model.Result;
import org.neo4j.ogm.response.model.NodeModel;
import org.neo4j.ogm.session.Session;
import org.springframework.stereotype.Component;

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


@Component
public class Neo4jUtil {

    
    private static final ObjectMapper mapper = new ObjectMapper();

    static {
        mapper.configure(JsonGenerator.Feature.QUOTE_FIELD_NAMES, false);
    }


    @SneakyThrows
    public static String propertiesMapToPropertiesStr(Map<String,Object> map) {
        map.entrySet().removeIf(entry -> Func.isEmpty(entry.getValue()));
        return mapper.writeValueAsString(map);
    }

    @Resource
    private Session session;

    public Session getSession() {
        return this.session;
    }

    
    public List<String> getAllLabelName() {
        String cypherSql = "match (n) return distinct labels(n) as name";
        Result query = session.query(cypherSql, new HashMap<>());
        ArrayList<String> labelNames = new ArrayList<>();
        for (Map<String, Object> map : query.queryResults()) {
            String[] names = (String[]) map.get("name");
            for (String name : names) {
                labelNames.add(name);
            }

        }
        return labelNames;
    }

    
    public List<String> getAllRelationName() {
        String cypherSql = "MATCH ()-[r]-() RETURN distinct type(r) as name";
        Result query = session.query(cypherSql, new HashMap<>());
        ArrayList<String> relationNames = new ArrayList<>();
        for (Map<String, Object> map : query.queryResults()) {
            relationNames.add(map.get("name").toString());
        }
        return relationNames;
    }

    
    public List<Neo4jBasicNode> queryNode(Neo4jBasicNode node) {
        String cypherSql = "";
        if (Func.isNotEmpty(node.getId())) {
            cypherSql = String.fORMat("MATCH (n) where id(n)=%s return n", node.getId());
        } else {
            String labels = "";
            if (Func.isNotEmpty(node.getLabels())) {
                labels = ":`" + String.join("`:`", node.getLabels()) + "`";
            }
            String property = "";
            if (Func.isNotEmpty(node.getProperty())) {
                property = Neo4jUtil.propertiesMapToPropertiesStr(node.getProperty());
            }
            cypherSql = String.format("match(n%s%s) return n", labels, property);
        }
        Result query = session.query(cypherSql, new HashMap<>());
        ArrayList<Neo4jBasicNode> nodeList = new ArrayList<>();
        Iterable<Map<String, Object>> maps = query.queryResults();
        for (Map<String, Object> map : maps) {
            NodeModel queryNode = (NodeModel) map.get("n");
            Neo4jBasicNode startNodeVo = new Neo4jBasicNode();
            startNodeVo.setId(queryNode.getId());
            startNodeVo.setLabels(Arrays.asList(queryNode.getLabels()));
            List<Property<String, Object>> propertyList = queryNode.getPropertyList();
            HashMap<String, Object> proMap = new HashMap<>();
            for (Property<String, Object> strinGobjectProperty : propertyList) {
                if (proMap.containsKey(stringObjectProperty.geTKEy())) {
                    throw new RuntimeException("数据重复");
                }
                proMap.put(stringObjectProperty.getKey(), stringObjectProperty.getValue());
            }
            startNodeVo.setProperty(proMap);
            nodeList.add(startNodeVo);
        }
        session.clear();
        return nodeList;
    }

    
    public boolean createNode(Neo4jBasicNode node, Boolean nodup) {
        String labels = "";

        if (Func.isNotEmpty(node.getLabels())) {
            labels = ":`" + String.join("`:`", node.getLabels()) + "`";
        }
        String property = "";
        if (Func.isNotEmpty(node.getProperty())) {
            property = Neo4jUtil.propertiesMapToPropertiesStr(node.getProperty());
        }
        String cypherSql = String.format("%s(%s%s)", nodup ? "MERGE" : "create", labels, property);
        Result query = session.query(cypherSql, new HashMap<>());
        session.clear();
        return query.queryStatistics().getNodesCreated() > 0;
    }


    
    public boolean createNode(Neo4jBasicNode node) {
        return this.createNode(node, false);
    }

    
    public boolean recreateNode(Neo4jBasicNode node){
        List<String> saveLabels = node.getLabels();
        Map<String, Object> saveProperty = node.getProperty();
        Set<String> savePropertyKeySet = saveProperty.keySet();
        //查询用属性查询节点是不是存在。
        //存在比较标签的lable1是不是一样。不一样就这个查询到的节点（少了就新增标签，多了就删除标签）
        Neo4jBasicNode queryNode= BeanUtil.copy(node,Neo4jBasicNode.class);
        queryNode.setLabels(null);
        List<Neo4jBasicNode> queryNodeList = this.queryNode(queryNode);

        if (queryNodeList.isEmpty()){
            return createNode(node,true);
        }

        for (Neo4jBasicNode neo4jBasicNode : queryNodeList) {
            //处理标签
            List<String> queryLabels = neo4jBasicNode.getLabels();
            ArrayList<String> addLabels = new ArrayList<>();
            for (String saveLabel : saveLabels) {
                if (!queryLabels.contains(saveLabel)){
                    //新增标签
                    addLabels.add(saveLabel);
                }
            }
            String addLabelStr=addLabels.isEmpty()?"":("e:"+String.join(":",addLabels));

            //处理属性
            Map<String, Object> queryProperty = neo4jBasicNode.getProperty();
            Set<String> queryPropertyKeySet = queryProperty.keySet();


            HashMap<String, Object> addPropertyMap = new HashMap<>();
            for (String savePropertyKey: savePropertyKeySet) {
                if (!queryPropertyKeySet.contains(savePropertyKey)){
                    addPropertyMap.put(savePropertyKey,saveProperty.get(savePropertyKey));
                }
            }
            String addPropertyStr=addPropertyMap.isEmpty()?"":(",e+="+ Neo4jUtil.propertiesMapToPropertiesStr(addPropertyMap));
            if(StringUtils.isAllEmpty(addPropertyStr,addPropertyStr)){

                return true;
            }

            String addLabelCypherSql =String.format("MERGE (e) with e where id(e)=%s set %s %s return count(e) as count",neo4jBasicNode.getId(),addLabelStr,addPropertyStr);
            Result query = session.query(addLabelCypherSql, new HashMap<>());
            System.out.println("跟新了："+neo4jBasicNode.getId());

            session.clear();
        }
        //创建不重复节点
        return true;
    };

    
    public Long batchCreateNode(List<Neo4jBasicNode> nodeList) {
        return this.batchCreateNode(nodeList, false);
    }

    
    public Long batchCreateNode(List<Neo4jBasicNode> nodeList, Boolean nodup) {

        ArrayList<Neo4jBasicNode> addNode = new ArrayList<>();
        //验证
        for (Neo4jBasicNode neo4jBasicNode : nodeList) {
            if ((!nodup) || this.queryNode(neo4jBasicNode).size() == 0) {
                addNode.add(neo4jBasicNode);
            }

        }
        String cypherSql = "create";
        ArrayList<String> content = new ArrayList<>();
        for (Neo4jBasicNode node : addNode) {
            String labels = "";
            if (Func.isNotEmpty(node.getLabels())) {
                labels = ":`" + String.join("`:`", node.getLabels()) + "`";
            }
            String property = "";
            if (Func.isNotEmpty(node.getProperty())) {
                property = Neo4jUtil.propertiesMapToPropertiesStr(node.getProperty());
            }
            content.add(String.format("(%s%s)", labels, property));
        }
        cypherSql += String.join(",", content);
        if (content.size() == 0) {
            return 0L;
        }
        Result query = session.query(cypherSql, new HashMap<>());
        session.clear();
        return Long.valueOf(query.queryStatistics().getNodesCreated());

    }


    
    public Integer delNode(Neo4jBasicNode node, boolean delRelation) {
        String cypherSql = "";
        if (Func.isNotEmpty(node.getId())) {
            cypherSql = String.format("MATCH (n) where id(n)=%s ", node.getId());
        } else {
            String labels = "";
            if (Func.isNotEmpty(node.getLabels())) {
                labels = ":`" + String.join("`:`", node.getLabels()) + "`";
            }
            String property = "";
            if (Func.isNotEmpty(node.getProperty())) {
                property = Neo4jUtil.propertiesMapToPropertiesStr(node.getProperty());
            }
            cypherSql = String.format("match(n%s%s) ", labels, property);
        }
        if (delRelation) {
            cypherSql += "DETACH DELETE n";
        } else {
            //删除不存在关系的节点
            cypherSql += " where not exists((n)-[]-()) DELETE n";

        }
        Result query = session.query(cypherSql, new HashMap<>());
        session.clear();
        return query.queryStatistics().getNodesDeleted();
    }


    
    public Integer delNode(Neo4jBasicNode node) {
        return this.delNode(node, false);
    }

    public int queryNodeCreateRelation(Neo4jBasicNode start, Neo4jBasicNode end, Neo4jBaiscRelation relation) {
        Neo4jSaveRelationDTO dto = new Neo4jSaveRelationDTO();
        dto.setStart(start);
        dto.setEnd(end);
        dto.setRelationship(relation);
        return queryNodeCreateRelation(dto);
    }

    
    public int queryNodeCreateRelation(Neo4jSaveRelationDTO saveRelation) {
        //开始节点和结束节点验证

        String cypherSql = "";
        String startLable = "";
        if (Func.isNotEmpty(saveRelation.getStart().getLabels())) {
            startLable = ":`" + String.join("`:`", saveRelation.getStart().getLabels()) + "`";
        }
        String startProperty = "";
        if (Func.isNotEmpty(saveRelation.getStart().getProperty())) {
            startProperty = Neo4jUtil.propertiesMapToPropertiesStr(saveRelation.getStart().getProperty());
        }

        String endLable = "";
        if (Func.isNotEmpty(saveRelation.getEnd().getLabels())) {
            endLable = ":`" + String.join("`:`", saveRelation.getEnd().getLabels()) + "`";
        }
        String endProperty = "";
        if (Func.isNotEmpty(saveRelation.getEnd().getProperty())) {
            endProperty = Neo4jUtil.propertiesMapToPropertiesStr(saveRelation.getEnd().getProperty());
        }
        String startWhere = "";
        if (Func.isNotEmpty(saveRelation.getStart().getId())) {
            startWhere += " where id(start)=" + saveRelation.getStart().getId();
            startLable = "";
            startProperty = "";
        }
        String endWhere = "";
        if (Func.isNotEmpty(saveRelation.getEnd().getId())) {
            endWhere += " where id(end)=" + saveRelation.getEnd().getId();
            endLable = "";
            endProperty = "";
        }


        String relationType = "";
        if (Func.isNotEmpty(saveRelation.getRelationship().getType())) {

            relationType = ":`" + saveRelation.getRelationship().getType() + "`";
        }
        if (Func.isEmpty(relationType)) {
            throw new RuntimeException("关系名称不能为空！");
        }
        String relationProperty = "";
        if (Func.isNotEmpty(saveRelation.getRelationship().getProperty())) {
            relationProperty = Neo4jUtil.propertiesMapToPropertiesStr(saveRelation.getRelationship().getProperty());
        }
        cypherSql = String.format("MATCH (start%s%s) %s with start MATCH (end%s%s) %s MERGE (start)-[rep%s%s]->(end)", startLable, startProperty, startWhere, endLable, endProperty, endWhere, relationType, relationProperty);
        Result query = session.query(cypherSql, new HashMap<>());
        session.clear();
        return query.queryStatistics().getRelationshipsCreated();
    }

    
    public boolean creteNodeAndRelation(Neo4jSaveRelationDTO saveRelation) {
        String cypherSql = "";
        String startLable = "";
        if (Func.isNotEmpty(saveRelation.getStart().getLabels())) {
            startLable = ":`" + String.join("`:`", saveRelation.getStart().getLabels()) + "`";
        }
        String startProperty = "";
        if (Func.isNotEmpty(saveRelation.getStart().getProperty())) {
            startProperty = Neo4jUtil.propertiesMapToPropertiesStr(saveRelation.getStart().getProperty());
        }

        String endLable = "";
        if (Func.isNotEmpty(saveRelation.getEnd().getLabels())) {
            endLable = ":`" + String.join("`:`", saveRelation.getEnd().getLabels()) + "`";
        }
        String endProperty = "";
        if (Func.isNotEmpty(saveRelation.getEnd().getProperty())) {
            endProperty = Neo4jUtil.propertiesMapToPropertiesStr(saveRelation.getEnd().getProperty());
        }

        String relationType = "";
        if (Func.isNotEmpty(saveRelation.getRelationship().getType())) {
            relationType = ":`" + saveRelation.getRelationship().getType() + "`";
        }
        if (Func.isEmpty(relationType)) {
            throw new RuntimeException("关系名称不能为空！");
        }
        String relationProperty = "";
        if (Func.isNotEmpty(saveRelation.getRelationship().getProperty())) {
            relationProperty = Neo4jUtil.propertiesMapToPropertiesStr(saveRelation.getRelationship().getProperty());
        }
        cypherSql = String.format("MERGE (start%s%s)-[rep%s%s]->(end%s%s)", startLable, startProperty, relationType, relationProperty, endLable, endProperty);
        Result query = session.query(cypherSql, new HashMap<>());
        session.clear();
        return query.queryStatistics().getRelationshipsCreated() > 0;

    }

    
    public List<Neo4jBasicRelationReturnVO> queryRelation(RelationDTO relationDTO) {
        RelationVO relationVO = formatRelation(relationDTO);

        //拼接sql
        String cypherSql = String.format("MATCH p=(a%s%s)-[r%s%s]->(b%s%s)-[*0..%s]->() RETURN p", relationVO.getStartLabelName(), relationVO.getStartNodeProperties(), relationVO.getRelationLabelName(), relationVO.getRelationProperties(), relationVO.getEndLabelName(), relationVO.getEndNodeProperties(), relationVO.getLevel());
        System.out.println(cypherSql);
        long startTime = System.currentTimeMillis();
        Result query = session.query(cypherSql, new HashMap<>());
        System.out.println(String.format("耗时%d秒", System.currentTimeMillis() - startTime));

        Iterable<Map<String, Object>> maps = query.queryResults();
        ArrayList<Neo4jBasicRelationReturnVO> returnList = new ArrayList<>();
        for (Map<String, Object> map : maps) {
            InternalPath.SelfContainedSegment[] ps = (InternalPath.SelfContainedSegment[]) map.get("p");
            for (InternalPath.SelfContainedSegment p : ps) {
                returnList.add(changeToNeo4jBasicRelationReturnVO(p));
            }
        }
        session.clear();
        return returnList;
    }
    
    public RelationVO formatRelation(RelationDTO relationDTO) {
        RelationVO relationVO = new RelationVO();

        //验证

        if (Func.isNotEmpty(relationDTO.getRelationLabelName())) {
            relationVO.setRelationLabelName(":`" + relationDTO.getRelationLabelName()+"`");
        } else {
            relationVO.setRelationLabelName("");
        }
        if (Func.isNotEmpty(relationDTO.getStartLabelName())) {
            relationVO.setStartLabelName(":`" + relationDTO.getStartLabelName()+"`");
        } else {
            relationVO.setStartLabelName("");
        }
        if (Func.isNotEmpty(relationDTO.getEndLabelName())) {
            relationVO.setEndLabelName(":`" + relationDTO.getEndLabelName()+"`");
        } else {
            relationVO.setEndLabelName("");
        }
        if (Func.isNotEmpty(relationDTO.getStartNodeProperties())) {
            relationVO.setStartNodeProperties(Neo4jUtil.propertiesMapToPropertiesStr(relationDTO.getStartNodeProperties()));
        } else {
            relationVO.setStartNodeProperties("");
        }

        if (Func.isNotEmpty(relationDTO.getRelationProperties())) {
            relationVO.setRelationProperties(Neo4jUtil.propertiesMapToPropertiesStr(relationDTO.getRelationProperties()));
        } else {
            relationVO.setRelationProperties("");
        }

        if (Func.isNotEmpty(relationDTO.getEndNodeProperties())) {
            relationVO.setEndNodeProperties(Neo4jUtil.propertiesMapToPropertiesStr(relationDTO.getEndNodeProperties()));
        } else {
            relationVO.setEndNodeProperties("");
        }
        if (Func.isNotEmpty(relationDTO.getLevel())) {
            relationVO.setLevel(relationDTO.getLevel().toString());
        } else {
            relationVO.setLevel("");
        }

        return relationVO;
    }


    
    public Neo4jBasicRelationReturnVO changeToNeo4jBasicRelationReturnVO(InternalPath.SelfContainedSegment selfContainedSegment) {
        Neo4jBasicRelationReturnVO neo4JBasicRelationReturnVO = new Neo4jBasicRelationReturnVO();
        //start
        Node start = selfContainedSegment.start();
        Neo4jBasicNode startNodeVo = new Neo4jBasicNode();
        startNodeVo.setId(start.id());
        startNodeVo.setLabels(IteratorUtils.toList(start.labels().iterator()));
        startNodeVo.setProperty(start.asMap());
        neo4JBasicRelationReturnVO.setStart(startNodeVo);
        //end
        Node end = selfContainedSegment.end();
        Neo4jBasicNode endNodeVo = new Neo4jBasicNode();
        endNodeVo.setId(end.id());
        endNodeVo.setLabels(IteratorUtils.toList(end.labels().iterator()));
        endNodeVo.setProperty(end.asMap());
        neo4JBasicRelationReturnVO.setEnd(endNodeVo);
        //relationship
        Neo4jQueryRelation neo4JQueryRelation = new Neo4jQueryRelation();
        Relationship relationship = selfContainedSegment.relationship();
        neo4JQueryRelation.setStart(relationship.startNodeId());
        neo4JQueryRelation.setEnd(relationship.endNodeId());
        neo4JQueryRelation.setId(relationship.id());
        neo4JQueryRelation.setType(relationship.type());
        neo4JQueryRelation.setProperty(relationship.asMap());
        neo4JBasicRelationReturnVO.setRelationship(neo4JQueryRelation);
        return neo4JBasicRelationReturnVO;
    }


}

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