Spring Boot 일대일 매핑 예 - 일대일 매핑을 사용하는 Spring Crud 예

20941 단어 springboot
https://loizenai.com/spring-boot-one-to-one-mapping-example/
자습서: "Spring Boot 일대일 매핑 예 - 일대일 매핑을 사용한 Spring Crud 예제"
이 강좌에서는 SpringBoot과 PostgreSQL 데이터베이스를 사용하여 Hibernate Spring JPA와 일대일 관계 모델을 상호작용할 수 있도록 Crud Rest APIs Post/Get/Put/Delete을 공개하는 방법을 보여 드리겠습니다.
  • 기술 - 스프링 부트 일대일 매핑 예:
  • 자바 8
  • Maven 3.5.4
  • SpringToolSuite 버전 3.9.4발표
  • SpringBoot 2.0.4.풀어주다

    개요 - 스프링 부트 일대일 매핑 예

    Student 모델 2개와 Contact one-to-one 관계:
    • [caption id= "attachment 4771"align="alignnone"width="504"] 스프링 부츠 일대일 - 모델 관계 [/caption]
    다음과 같이 SpringBoot 프로젝트를 만들었습니다.
    [caption id= "attachment 4772"align="alignnone"width="701"] Spring Boot Rest API Hibernate Spring JPA 일대일 Postgresql 아키텍처 [/caption]
    [caption id= "attachment 4773"align="alignnone"width="346"] SpringBoot 프로젝트 구조 [/caption]
    Hibernate JPA 구성은 Student 및 Contact 두 가지 모델로 제공됩니다.
  • Student 모델 ->
    • 
@Entity
@Table(name = "students")
@JsonIgnoreProperties({"hibernateLazyInitializer", "handler"}) 
public class Student implements Serializable {
    private static final long serialVersionUID = 1L;

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;
    
    @Column(name = "name")
    private String name;
    
    @Column(name = "age")
    private int age;
    
    @OneToOne(fetch = FetchType.LAZY,
            cascade =  CascadeType.ALL,
            mappedBy = "student")
    private Contact contact;
    
    public Student() {}
    
    public Student(String name, int age) {
        this.name = name;
        this.age = age;
    }
    
    // Getters & Setters methods
    // ...
    - Contact 모델:
    
@Entity
@Table(name = "contacts")
@JsonIgnoreProperties({"hibernateLazyInitializer", "handler"}) 
public class Contact implements Serializable{
    private static final long serialVersionUID = 1L;

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    @Column(name = "city")
    private String city;
    
    @Column(name = "phone")
    private String phone;
    
    @OneToOne(fetch = FetchType.LAZY, optional = false)
    @JoinColumn(name = "student_id", nullable = false)
    private Student student;
    
    public Contact() {
    }
    
    public Contact(String city, String phone) {
        this.city = city;
        this.phone = phone;
    }
    
    // Getters & Setters methods
    // ...
    Post/Get/Put/Delete명의 학생 및 담당자에게 RestAPIs를 소개합니다.
    - 학생 ->
  • @GetMapping("/api/students"): 모든 학생에게
  • @GetMapping("/api/students/{id}"): ID가
    • 인 학생
  • @PostMapping("/api/students"): 학생 1명 발표
  • @PutMapping("/api/students/{id}"): 업데이트 학생
  • @DeleteMapping("/api/students/{id}"): 학생 삭제
    • - 연락처 ->
  • @GetMapping("/contacts"): 모든 연락처 찾기
  • @GetMapping("/students/{studentId}/contacts"): 학생 ID
    • 으로 문의
  • @PostMapping("/students/{studentId}/contacts"): 연락처 추가
  • @PutMapping("/contacts/{contactId}"): 연락처 업데이트
  • @DeleteMapping("/contacts/{contactId}"): ID가
    • 인 연락처 삭제
    이제 우리는 처음부터 프로젝트를 만들 것이다.가자!

    SpringBoot 프로젝트 만들기 - SpringBoot 일대일 매핑 예


    SpringToolSuite를 사용하여 다음과 같은 종속 항목이 있는 Java 8 SpringBoot 프로젝트를 만들었습니다.
    
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>

<dependency>
    <groupId>org.postgresql</groupId>
    <artifactId>postgresql</artifactId>
    <scope>runtime</scope>
</dependency>

    SpringBoot OneToOne 모델 - 스프링 부트 일대일 매핑 예


    - Student 모델 ->
    code class="language-java">
package com.ozenero.springrestapi.onetoone.model;

import java.io.Serializable;

import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.OneToOne;
import javax.persistence.Table;

import com.fasterxml.jackson.annotation.JsonIgnoreProperties;

@Entity
@Table(name = "students")
@JsonIgnoreProperties({"hibernateLazyInitializer", "handler"}) 
public class Student implements Serializable {
    private static final long serialVersionUID = 1L;

     

    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;
    
    @Column(name = "name")
    private String name;
    
    @Column(name = "age")
    private int age;
    
    @OneToOne(fetch = FetchType.LAZY,
            cascade =  CascadeType.ALL,
            mappedBy = "student")
    private Contact contact;
    
    public Student() {}
    
    public Student(String name, int age) {
        this.name = name;
        this.age = age;
    }
    
    public void setId(Long id) {
        this.id = id;
    }
    
    public Long getId() {
        return this.id;
    }
    
    public void setName(String name) {
        this.name = name;
    }
    
    public String getName() {
        return this.name;
    }
    
    public void setAge(int age) {
        this.age =age;
    }
    
    public int getAge() {
        return this.age;
    }
}
    - Contact model : 
    
package com.ozenero.springrestapi.onetoone.model;

import java.io.Serializable;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.OneToOne;
import javax.persistence.Table;

import com.fasterxml.jackson.annotation.JsonIgnoreProperties;

@Entity
@Table(name = "contacts")
@JsonIgnoreProperties({"hibernateLazyInitializer", "handler"}) 
public class Contact implements Serializable{
    private static final long serialVersionUID = 1L;

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    @Column(name = "city")
    private String city;
    
    @Column(name = "phone")
    private String phone;
    
    @OneToOne(fetch = FetchType.LAZY, optional = false)
    @JoinColumn(name = "student_id", nullable = false)
    private Student student;
    
    public Contact() {
    }
    
    public Contact(String city, String phone) {
        this.city = city;
        this.phone = phone;
    }
    
    public void setId(Long id) {
        this.id = id;
    }
    
    public Long getId() {
        return this.id;
    }
    
    public void setCity(String city) {
        this.city = city;
    }
    
    public String getCity() {
        return this.city;
    }
    
    public void setPhone(String phone) {
        this.phone = phone;
    }
    
    public String getPhone() {
        return this.phone;
    }
    
    public void setStudent(Student student) {
        this.student = student;
    }
    
    public Student getStudent() {
        return this.student;
    }
}

    SpringBoot JPA 저장소 - 스프링 부트 일대일 매핑 예


    - StudentRepository :
    
package com.ozenero.springrestapi.onetoone.jpa;

import org.springframework.data.jpa.repository.JpaRepository;

import com.ozenero.springrestapi.onetoone.model.Student;

public interface StudentRepository extends JpaRepository {
}
    - ContactRepository 모델:
    
package com.ozenero.springrestapi.onetoone.jpa;

import java.util.List;

import org.springframework.data.jpa.repository.JpaRepository;

import com.ozenero.springrestapi.onetoone.model.Contact;

public interface ContactRepository extends JpaRepository {
    List findByStudentId(Long studentId);  
}
    application.properties 파일에 데이터 소스 구성을 추가하려면:
    
spring.datasource.url=jdbc:postgresql://localhost/testdb
spring.datasource.username=postgres
spring.datasource.password=123
spring.jpa.generate-ddl=true
#spring.jackson.serialization.fail-on-empty-beans=false

    SpringBoot Rest API-spring Boot 일대일 매핑 예 공개


    - StudentController :
    
package com.ozenero.springrestapi.onetoone.rest;

import java.util.List;
import java.util.Optional;

import javax.validation.Valid;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.DeleteMapping;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.PutMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import com.ozenero.springrestapi.onetoone.exception.NotFoundException;
import com.ozenero.springrestapi.onetoone.jpa.StudentRepository;
import com.ozenero.springrestapi.onetoone.model.Student;

@RestController
@RequestMapping("/api")
public class StudentController {
    
    @Autowired
    private StudentRepository studentRepository;
    
    @GetMapping("/students")
    public List getAllStudents() {
        return studentRepository.findAll();
    }
    
    @GetMapping("/students/{id}")
    public Student getStudentByID(@PathVariable Long id) {
        Optional optStudent = studentRepository.findById(id);
        if(optStudent.isPresent()) {
            return optStudent.get();
        }else {
            throw new NotFoundException("Student not found with id " + id);
        }
    }
    
    @PostMapping("/students")
    public Student createStudent(@Valid @RequestBody Student student) {
        return studentRepository.save(student);
    }
    
    @PutMapping("/students/{id}")
    public Student updateStudent(@PathVariable Long id,
                                   @Valid @RequestBody Student studentUpdated) {
        return studentRepository.findById(id)
                .map(student -> {
                    student.setName(studentUpdated.getName());
                    student.setAge(studentUpdated.getAge());
                    return studentRepository.save(student);
                }).orElseThrow(() -> new NotFoundException("Student not found with id " + id));
    }
    
    @DeleteMapping("/students/{id}")
    public String deleteStudent(@PathVariable Long id) {
        return studentRepository.findById(id)
                .map(student -> {
                    studentRepository.delete(student);
                    return "Delete Successfully!";
                }).orElseThrow(() -> new NotFoundException("Student not found with id " + id));
    }
}
    - ContactController :
    
package com.ozenero.springrestapi.onetoone.rest;

import java.util.List;

import javax.validation.Valid;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.DeleteMapping;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.PutMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import com.ozenero.springrestapi.onetoone.exception.NotFoundException;
import com.ozenero.springrestapi.onetoone.jpa.ContactRepository;
import com.ozenero.springrestapi.onetoone.jpa.StudentRepository;
import com.ozenero.springrestapi.onetoone.model.Contact;

@RestController
@RequestMapping("/api")
public class ContactController {
    @Autowired
    private ContactRepository contactRepository;
    
    @Autowired
    private StudentRepository studentRepository;
    
    @GetMapping("/contacts")
    public List getAllContacts(){
        return contactRepository.findAll();
    }
    
    @GetMapping("/students/{studentId}/contacts")
    public Contact getContactByStudentId(@PathVariable Long studentId) {
        
        if(!studentRepository.existsById(studentId)) {
            throw new NotFoundException("Student not found!");
        }
        
        List contacts = contactRepository.findByStudentId(studentId);
        if(contacts.size() > 0) {
            return contacts.get(0);
        }else {
            throw new NotFoundException("Contact not found!");
        }
    }
    
    @PostMapping("/students/{studentId}/contacts")
    public Contact addContact(@PathVariable Long studentId,
                            @Valid @RequestBody Contact contact) {
        return studentRepository.findById(studentId)
                .map(student -> {
                    contact.setStudent(student);
                    return contactRepository.save(contact);
                }).orElseThrow(() -> new NotFoundException("Student not found!"));
    }
    
    @PutMapping("/contacts/{contactId}")
    public Contact updateContact(@PathVariable Long contactId,
                               @Valid @RequestBody Contact contactUpdated) {
        return contactRepository.findById(contactId)
                .map(contact -> {
                    contact.setCity(contactUpdated.getCity());
                    contact.setPhone(contactUpdated.getPhone());
                    return contactRepository.save(contact);
                }).orElseThrow(() -> new NotFoundException("Contact not found!"));
    }
    
    @DeleteMapping("/contacts/{contactId}")
    public String deleteContact(@PathVariable Long contactId) {
        return contactRepository.findById(contactId)
                .map(contact -> {
                    contactRepository.delete(contact);
                    return "Deleted Successfully!";
                }).orElseThrow(() -> new NotFoundException("Contact not found!"));
    }
}

    실행 및 결과 확인


    - 명령줄 mvn spring-boot:run을 사용하여 SpringBoot 프로젝트를 실행합니다.
    PostgreSQL에는
    [caption id= "attachment 4774"align="alignnone"width="358"] Spring Boot Rest API 휴면 Spring Jpa Jpa가 만든 일대일 Postgresql 표 [/caption]
    - 학생 추가:
    [caption id= "attachment 4775"align="alignnone"width="572"] Spring Boot Rest API Hibernate Spring JPA 일대일 Postgresql 표 - 학생 데이터 [/caption] 발표
    - 연락처 추가:
    [caption id= "attachment 4776"align="alignnone"width="566"] Spring Boot Rest API Hibernate Spring Jpa 일대일 Postgresql 연락처 [/caption]
    - 연락처 업데이트:
    [caption id= "attachment 4777"align="alignnone"width="569"] Spring Boot Rest API Hibernate Spring JPA 일대일 Postgresql Put 연락처 [/caption]
    - 학생 업데이트:
    [caption id = "attachment 4778"align="alignnone"width="588"] Spring Boot Rest API Hibernate Spring JPA 일대일 Postgresql 학생 [caption]
    - 모든 학생에게
    [caption id= "attachment 4779"align="alignnone"width="332"] Spring Boot Rest API Hibernate Spring Jpa 일대일 Postgresql Get All Student[/caption]
    - 모든 연락처 검색:
    [caption id = "attachment 4780"align="alignnone"width="330"] Spring Boot Rest API Hibernate Spring Jpa 일대일 Postgresql 모든 연락처 얻기 [/caption]
    - 학생 삭제:
    [caption id = "attachment 4781"align="alignnone"width="426"] Spring Boot Rest API Hibernate Spring JPA 일대일 Postgresql 표 삭제 학생 [/caption]
    - 연락처 삭제:
    [caption id= "attachment 4782"align="alignnone"width="392"] Spring Boot Rest API Hibernate Spring JPA 일대일 Postgresql 테이블에서 연락처 삭제 [/caption]
    참고: PostgreSQL 명령줄:PostgreSQL\9.6\bin>psql.exe --username="postgres" -W: PostgreSQL에 연결->
    
C:\Program Files\PostgreSQL\9.6\bin>psql.exe --username="postgres" -W
Password for user postgres:
psql (9.6.9)
WARNING: Console code page (437) differs from Windows code page (1252)
         8-bit characters might not work correctly. See psql reference
         page "Notes for Windows users" for details.
Type "help" for help.
    - \l: 데이터베이스 목록
    - \c testdb: "testdb"에 연결
    - \d: 관계 목록 ->
    testdb=#\d
    관계 목록
    모드 | 이름 | 유형 | 소유자
    --------+-----------------+----------+----------
    공용 | 연락처 | 표 | 박사후
    일반 | 연락처 | id | 순서 | 박사후
    공공 | 학생 | 책상 | 박사후
    공용|학생|신분|순서|대학원생
    (4열)
  • testdb=# \q: 출구

    자세히 보기


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  • Sequelize One to One Example
  • Node.js PostgreSQL CRUD Example

    • 소스 코드


    SpringBoot-RestAPIs-OneToOne
    HTML에서 탭에 스크롤 막대를 추가하는 방법
    zeptozepto tap "투명"해결 방법

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