SpringBoot 實戰 (十八) | 整合 MongoDB

時間 2019-11-08

標籤 springboot 實戰十八整合 mongodb 欄目 Spring 简体版

原文原文鏈接

微信公衆號：一個優秀的廢人。若有問題，請後臺留言，反正我也不會聽。html

前言

如題，今天介紹下 SpringBoot 是如何整合 MongoDB 的。前端

MongoDB 簡介

MongoDB 是由 C++ 編寫的非關係型數據庫，是一個基於分佈式文件存儲的開源數據庫系統，它將數據存儲爲一個文檔，數據結構由鍵值 (key=>value) 對組成。MongoDB 文檔相似於 JSON 對象。字段值能夠包含其餘文檔，數組及文檔數組，很是靈活。存儲結構以下：java

{
	"studentId": "201311611405",
	"age":24,
	"gender":"男",
	"name":"一個優秀的廢人"
}
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準備工做

SpringBoot 2.1.3 RELEASE
MongnDB 2.1.3 RELEASE
MongoDB 4.0
IDEA
JDK8
建立一個名爲 test 的數據庫，不會建的。參考菜鳥教程： http://www.runoob.com/mongodb/mongodb-tutorial.html

配置數據源

spring:
 data:
 mongodb:
 uri: mongodb://localhost:27017/test
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以上是無密碼寫法，若是 MongoDB 設置了密碼應這樣設置：git

spring:
  data:
    mongodb:
      uri: mongodb://name:password@localhost:27017/test
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pom 依賴配置

<!-- mongodb 依賴 -->
<dependency>
	<groupId>org.springframework.boot</groupId>
	<artifactId>spring-boot-starter-data-mongodb</artifactId>
</dependency>
<!-- web 依賴 -->
<dependency>
	<groupId>org.springframework.boot</groupId>
	<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!-- lombok 依賴 -->
<dependency>
	<groupId>org.projectlombok</groupId>
	<artifactId>lombok</artifactId>
	<optional>true</optional>
</dependency>
<!-- test 依賴（沒用到） -->
<dependency>
	<groupId>org.springframework.boot</groupId>
	<artifactId>spring-boot-starter-test</artifactId>
	<scope>test</scope>
</dependency>
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實體類

@Data
public class Student {

    @Id
    private String id;

    @NotNull
    private String studentId;

    private Integer age;

    private String name;

    private String gender;

}
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dao 層

和 JPA 同樣，SpringBoot 一樣爲開發者準備了一套 Repository ，只須要繼承 MongoRepository 傳入實體類型以及主鍵類型便可。github

@Repository
public interface StudentRepository extends MongoRepository<Student, String> {
}
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service 層

public interface StudentService {

    Student addStudent(Student student);

    void deleteStudent(String id);

    Student updateStudent(Student student);

    Student findStudentById(String id);

    List<Student> findAllStudent();

}
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實現類：web

@Service
public class StudentServiceImpl implements StudentService {

    @Autowired
    private StudentRepository studentRepository;

    /** * 添加學生信息 * @param student * @return */
    @Override
    @Transactional(rollbackFor = Exception.class)
    public Student addStudent(Student student) {
        return studentRepository.save(student);
    }

    /** * 根據 id 刪除學生信息 * @param id */
    @Override
    public void deleteStudent(String id) {
        studentRepository.deleteById(id);
    }

    /** * 更新學生信息 * @param student * @return */
    @Override
    @Transactional(rollbackFor = Exception.class)
    public Student updateStudent(Student student) {
        Student oldStudent = this.findStudentById(student.getId());
        if (oldStudent != null){
            oldStudent.setStudentId(student.getStudentId());
            oldStudent.setAge(student.getAge());
            oldStudent.setName(student.getName());
            oldStudent.setGender(student.getGender());
            return studentRepository.save(oldStudent);
        } else {
            return null;
        }
    }

    /** * 根據 id 查詢學生信息 * @param id * @return */
    @Override
    public Student findStudentById(String id) {
        return studentRepository.findById(id).get();
    }

    /** * 查詢學生信息列表 * @return */
    @Override
    public List<Student> findAllStudent() {
        return studentRepository.findAll();
    }
}
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controller 層

@RestController
@RequestMapping("/student")
public class StudentController {

    @Autowired
    private StudentService studentService;

    @PostMapping("/add")
    public Student addStudent(@RequestBody Student student){
        return studentService.addStudent(student);
    }

    @PutMapping("/update")
    public Student updateStudent(@RequestBody Student student){
        return studentService.updateStudent(student);
    }

    @GetMapping("/{id}")
    public Student findStudentById(@PathVariable("id") String id){
        return studentService.findStudentById(id);
    }

    @DeleteMapping("/{id}")
    public void deleteStudentById(@PathVariable("id") String id){
        studentService.deleteStudent(id);
    }

    @GetMapping("/list")
    public List<Student> findAllStudent(){
        return studentService.findAllStudent();
    }

}
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