✨ spring-boot-demo-neo4j 完成

spring-boot-demo-neo4j/README.md

@@ -12,5 +12,328 @@
 4. 启动容器：`docker start neo4j-3.5.0`
 5. 浏览器 http://localhost:7474/ 访问 neo4j 管理后台，初始账号/密码 neo4j/neo4j，会要求修改初始化密码，我们修改为 neo4j/admin
 
+## pom.xml
 
+```xml
+<?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>
 
+    <artifactId>spring-boot-demo-neo4j</artifactId>
+    <version>1.0.0-SNAPSHOT</version>
+    <packaging>jar</packaging>
+
+    <name>spring-boot-demo-neo4j</name>
+    <description>Demo project for Spring Boot</description>
+
+    <parent>
+        <groupId>com.xkcoding</groupId>
+        <artifactId>spring-boot-demo</artifactId>
+        <version>1.0.0-SNAPSHOT</version>
+    </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-data-neo4j</artifactId>
+        </dependency>
+
+        <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.projectlombok</groupId>
+            <artifactId>lombok</artifactId>
+            <optional>true</optional>
+        </dependency>
+
+        <dependency>
+            <groupId>cn.hutool</groupId>
+            <artifactId>hutool-all</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>com.google.guava</groupId>
+            <artifactId>guava</artifactId>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <finalName>spring-boot-demo-neo4j</finalName>
+        <plugins>
+            <plugin>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-maven-plugin</artifactId>
+            </plugin>
+        </plugins>
+    </build>
+
+</project>
+```
+
+## application.yml
+
+```yaml
+spring:
+  data:
+    neo4j:
+      uri: bolt://localhost
+      username: neo4j
+      password: admin
+      open-in-view: false
+```
+
+## CustomIdStrategy.java
+
+```java
+/**
+ * <p>
+ * 自定义主键策略
+ * </p>
+ *
+ * @package: com.xkcoding.neo4j.config
+ * @description: 自定义主键策略
+ * @author: yangkai.shen
+ * @date: Created in 2018-12-24 14:40
+ * @copyright: Copyright (c) 2018
+ * @version: V1.0
+ * @modified: yangkai.shen
+ */
+public class CustomIdStrategy implements IdStrategy {
+    @Override
+    public Object generateId(Object o) {
+        return IdUtil.fastUUID();
+    }
+}
+```
+
+## 部分Model代码
+
+### Student.java
+
+```java
+/**
+ * <p>
+ * 学生节点
+ * </p>
+ *
+ * @package: com.xkcoding.neo4j.model
+ * @description: 学生节点
+ * @author: yangkai.shen
+ * @date: Created in 2018-12-24 14:38
+ * @copyright: Copyright (c) 2018
+ * @version: V1.0
+ * @modified: yangkai.shen
+ */
+@Data
+@NoArgsConstructor
+@RequiredArgsConstructor(staticName = "of")
+@AllArgsConstructor
+@Builder
+@NodeEntity
+public class Student {
+    /**
+     * 主键，自定义主键策略，使用UUID生成
+     */
+    @Id
+    @GeneratedValue(strategy = CustomIdStrategy.class)
+    private String id;
+
+    /**
+     * 学生姓名
+     */
+    @NonNull
+    private String name;
+
+    /**
+     * 学生选的所有课程
+     */
+    @Relationship(NeoConsts.R_LESSON_OF_STUDENT)
+    @NonNull
+    private List<Lesson> lessons;
+
+    /**
+     * 学生所在班级
+     */
+    @Relationship(NeoConsts.R_STUDENT_OF_CLASS)
+    @NonNull
+    private Class clazz;
+
+}
+```
+
+## 部分Repository代码
+
+### StudentRepository.java
+
+```java
+/**
+ * <p>
+ * 学生节点Repository
+ * </p>
+ *
+ * @package: com.xkcoding.neo4j.repository
+ * @description: 学生节点Repository
+ * @author: yangkai.shen
+ * @date: Created in 2018-12-24 15:05
+ * @copyright: Copyright (c) 2018
+ * @version: V1.0
+ * @modified: yangkai.shen
+ */
+public interface StudentRepository extends Neo4jRepository<Student, String> {
+    /**
+     * 根据名称查找学生
+     *
+     * @param name  姓名
+     * @param depth 深度
+     * @return 学生信息
+     */
+    Optional<Student> findByName(String name, @Depth int depth);
+
+    /**
+     * 根据班级查询班级人数
+     *
+     * @param className 班级名称
+     * @return 班级人数
+     */
+    @Query("MATCH (s:Student)-[r:R_STUDENT_OF_CLASS]->(c:Class{name:{className}}) return count(s)")
+    Long countByClassName(@Param("className") String className);
+
+
+    /**
+     * 查询满足 (学生)-[选课关系]-(课程)-[选课关系]-(学生) 关系的 同学
+     *
+     * @return 返回同学关系
+     */
+    @Query("match (s:Student)-[:R_LESSON_OF_STUDENT]->(l:Lesson)<-[:R_LESSON_OF_STUDENT]-(:Student) with l.name as lessonName,collect(distinct s) as students return lessonName,students")
+    List<ClassmateInfoGroupByLesson> findByClassmateGroupByLesson();
+
+    /**
+     * 查询师生关系，(学生)-[班级学生关系]-(班级)-[班主任关系]-(教师)
+     *
+     * @return 返回师生关系
+     */
+    @Query("match (s:Student)-[:R_STUDENT_OF_CLASS]->(:Class)-[:R_BOSS_OF_CLASS]->(t:Teacher) with t.name as teacherName,collect(distinct s) as students return teacherName,students")
+    List<TeacherStudent> findTeacherStudentByClass();
+
+    /**
+     * 查询师生关系，(学生)-[选课关系]-(课程)-[任教老师关系]-(教师)
+     *
+     * @return 返回师生关系
+     */
+    @Query("match ((s:Student)-[:R_LESSON_OF_STUDENT]->(:Lesson)-[:R_TEACHER_OF_LESSON]->(t:Teacher))with t.name as teacherName,collect(distinct s) as students return teacherName,students")
+    List<TeacherStudent> findTeacherStudentByLesson();
+}
+```
+
+## Neo4jTest.java
+
+```java
+/**
+ * <p>
+ * 测试Neo4j
+ * </p>
+ *
+ * @package: com.xkcoding.neo4j
+ * @description: 测试Neo4j
+ * @author: yangkai.shen
+ * @date: Created in 2018-12-24 15:17
+ * @copyright: Copyright (c) 2018
+ * @version: V1.0
+ * @modified: yangkai.shen
+ */
+@Slf4j
+public class Neo4jTest extends SpringBootDemoNeo4jApplicationTests {
+    @Autowired
+    private NeoService neoService;
+
+    /**
+     * 测试保存
+     */
+    @Test
+    public void testSave() {
+        neoService.initData();
+    }
+
+    /**
+     * 测试删除
+     */
+    @Test
+    public void testDelete() {
+        neoService.delete();
+    }
+
+    /**
+     * 测试查询 鸣人 学了哪些课程
+     */
+    @Test
+    public void testFindLessonsByStudent() {
+        // 深度为1，则课程的任教老师的属性为null
+        // 深度为2，则会把课程的任教老师的属性赋值
+        List<Lesson> lessons = neoService.findLessonsFromStudent("漩涡鸣人", 2);
+
+        lessons.forEach(lesson -> log.info("【lesson】= {}", JSONUtil.toJsonStr(lesson)));
+    }
+
+    /**
+     * 测试查询班级人数
+     */
+    @Test
+    public void testCountStudent() {
+        Long all = neoService.studentCount(null);
+        log.info("【全校人数】= {}", all);
+        Long seven = neoService.studentCount("第七班");
+        log.info("【第七班人数】= {}", seven);
+    }
+
+    /**
+     * 测试根据课程查询同学关系
+     */
+    @Test
+    public void testFindClassmates() {
+        Map<String, List<Student>> classmates = neoService.findClassmatesGroupByLesson();
+        classmates.forEach((k, v) -> log.info("因为一起上了【{}】这门课，成为同学关系的有：{}", k, JSONUtil.toJsonStr(v.stream()
+                .map(Student::getName)
+                .collect(Collectors.toList()))));
+    }
+
+    /**
+     * 查询所有师生关系，包括班主任/学生，任课老师/学生
+     */
+    @Test
+    public void testFindTeacherStudent() {
+        Map<String, Set<Student>> teacherStudent = neoService.findTeacherStudent();
+        teacherStudent.forEach((k, v) -> log.info("【{}】教的学生有 {}", k, JSONUtil.toJsonStr(v.stream()
+                .map(Student::getName)
+                .collect(Collectors.toList()))));
+    }
+}
+```
+
+## 截图
+
+运行测试类之后，可以通过访问 http://localhost:7474 ，查看neo里所有节点和关系
+
+![image-20181225150513101](assets/image-20181225150513101-5721513.png)
+
+
+
+## 参考
+
+- spring-data-neo4j 官方文档：https://docs.spring.io/spring-data/neo4j/docs/5.1.2.RELEASE/reference/html/
+- neo4j 官方文档：https://neo4j.com/docs/getting-started/3.5/