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Spring boot项目集成Neo4j
第一步,创建Springboot工程 使用Eclipse 创建Maven项目,并修改pom.xml文件为:
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.example</groupId>
<artifactId>demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>demo</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.9.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-neo4j</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
第二步,修改配置文件application.properties
server.port=8080
spring.data.neo4j.uri=http://{neo4jweb端访问地址}:7474
spring.data.neo4j.username=neo4j账号
spring.data.neo4j.password=neo4j密码
第三步,model文件—节点User和关系UserRelation,这两个文件与neo4j里面的节点和关系的属性一一对应,此处是我的示例,具体与各自的neo4j内容对于,label必须与neo4j库里名字一致
@NodeEntity(label = "User")
public class UserNode {
@GraphId
private Long nodeId;
@Property(name = "userId")
private String userId;
@Property(name = "name")
private String name;
@Property(name = "age")
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 getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
}
@RelationshipEntity(type = "UserRelation")
public class UserRelation {
@GraphId
private Long id;
@StartNode
private UserNode startNode;
@EndNode
private UserNode 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 UserNode getEndNode() {
return endNode;
}
public void setEndNode(UserNode endNode) {
this.endNode = endNode;
}
}
第四步,repository文件----UserRepository和UserRelationRepository,@Query里面编写Cypher查询
@Component
public interface UserRepository extends GraphRepository<UserNode> {
[@Query](/user/Query)("MATCH (n:User) RETURN n ")
List<UserNode> getUserNodeList();
[@Query](/user/Query)("create (n:User{age:{age},name:{name}}) RETURN n ")
List<UserNode> addUserNodeList(@Param("name") String name, @Param("age")int age);
}
@Component
public interface UserRelationRepository extends GraphRepository<UserRelation> {
[@Query](/user/Query)("match p=(n:User)<-[r:UserRelation]->(n1:User) where n.userId={firstUserId} and n1.userId={secondUserId} return p")
List<UserRelation> findUserRelationByEachId(@Param("firstUserId") String firstUserId, @Param("secondUserId") String secondUserId);
[@Query](/user/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);
}
第五步,修改service文件
@Service
public class Neo4jService {
@Autowired
private UserRepository userRepository;
@Autowired
private UserRelationRepository userRelationRepository;
/**
* Always use constructor based dependency injection in your beans.
* Always use assertions for mandatory dependencies.
*/
public int addUser(UserNode userNode){
userRepository.addUserNodeList(userNode.getName(),userNode.getAge());
return 1;
}
}
第六步,neo4j文件注入config----Neo4jConfig,注意basePackges的路径。
@Configuration
@EnableNeo4jRepositories(basePackages = "com.example.demo.repository")
public class Neo4jConfig {
}
3 回复
@pangguoming 老师,我尝试了您说的方法,但是还是会报之前同样的错误信息:org.neo4j.ogm.exception.core.AmbiguousBaseClassException: Multiple classes found in type hierarchy that map to: [ApplyUser, Phone, a_User, b_Phone, c_OtherPhone];查询a_User标签对应的节点,会过滤出几点的其他标签,无法完成映射。您有遇到过这种情况吗?