Spring Boot Orm 简明教程

Spring Boot ORM - Update Project

现在，让我们为 Spring 应用程序添加一个 REST API，它可以添加、编辑、删除和显示员工(们)。

Entity − Employee.java

package com.tutorialspoint.springbootorm.entity;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;

@Entity
public class Employee {

   @Id
   @GeneratedValue(strategy = GenerationType.IDENTITY)
   private int id;
   private String name;
   private int age;
   private String email;

   public int getId() {
      return id;
   }

   public void setId(int id) {
      this.id = id;
   }

   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;
   }

   public String getEmail() {
      return email;
   }

   public void setEmail(String email) {
      this.email = email;
   }
}

Repository − EmployeeRepository.java

package com.tutorialspoint.springbootorm.repository;

import org.springframework.data.repository.CrudRepository;
import org.springframework.stereotype.Repository;

import com.tutorialspoint.springbootorm.entity.Employee;

@Repository
public interface EmployeeRepository extends CrudRepository<Employee, Integer>  {
}

Service − EmployeeService.java

package com.tutorialspoint.springbootorm.service;

import java.util.ArrayList;
import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import com.tutorialspoint.springbootorm.entity.Employee;
import com.tutorialspoint.springbootorm.repository.EmployeeRepository;

@Service
public class EmployeeService {

   @Autowired
   EmployeeRepository repository;

   public Employee getEmployeeById(int id) {
      return repository.findById(id).get();
   }

   public List<Employee> getAllEmployees(){
      List<Employee> employees = new ArrayList<Employee>();
      repository.findAll().forEach(employee -> employees.add(employee));
      return employees;
   }

   public void saveOrUpdate(Employee employee) {
      repository.save(employee);
   }

   public void deleteEmployeeById(int id) {
      repository.deleteById(id);
   }
}

Service − EmployeeController.java

package com.tutorialspoint.springbootorm.controller;

import java.util.List;

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.tutorialspoint.springbootorm.entity.Employee;
import com.tutorialspoint.springbootorm.service.EmployeeService;

@RestController
@RequestMapping(path = "/emp")
public class EmployeeController {

   @Autowired
   EmployeeService employeeService;

   @GetMapping("/employees")
   public List<Employee> getAllEmployees(){
      return employeeService.getAllEmployees();
   }

   @GetMapping("/employee/{id}")
   public Employee getEmployee(@PathVariable("id") int id) {
      return employeeService.getEmployeeById(id);
   }

   @DeleteMapping("/employee/{id}")
   public void deleteEmployee(@PathVariable("id") int id) {
      employeeService.deleteEmployeeById(id);
   }

   @PostMapping("/employee")
   public void addEmployee(@RequestBody Employee employee) {
      employeeService.saveOrUpdate(employee);
   }

   @PutMapping("/employee")
   public void updateEmployee(@RequestBody Employee employee) {
      employeeService.saveOrUpdate(employee);
   }
}

Main Application − SpringBootOrmApplication.java

package com.tutorialspoint.springbootorm;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class SpringBootOrmApplication {
   public static void main(String[] args) {
      SpringApplication.run(SpringBootOrmApplication.class, args);
   }
}