Postman使用实例

Postman使用实例

实体类Emp

package com.example.springboot_postman.pojo;

import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

import javax.persistence.*;
import java.io.Serializable;

/**
 * @Author moon
 * @Date 2023/10/2 18:29
 * @Description
 */
@Entity
@Table(name = "t_emp")
@Data
@AllArgsConstructor
@NoArgsConstructor
@JsonIgnoreProperties(value = { "hibernateLazyInitializer"})
public class Emp implements Serializable {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "emp_id")
    private int id;

    @Column(name = "emp_name")
    private String name;

    @Column(name = "age")
    private int age;

    @Column(name = "gender")
    private String gender;

    @Column(name = "email")
    private String email;

}

JPA接口EmpDao

package com.example.springboot_postman.dao;

import com.example.springboot_postman.pojo.Emp;
import org.springframework.data.jpa.repository.JpaRepository;

/**
 * @Author moon
 * @Date 2023/10/2 18:43
 * @Description
 */
public interface EmpDao extends JpaRepository<Emp, Integer> {
}

1. 分页查询

EmpService:

public Page<Emp> queryByPage(Integer page, Integer size) {
        Pageable pageable = PageRequest.of(page, size,Sort.by(Sort.Direction.DESC, "id"));
        return empDao.findAll(pageable);
    }

EmpController

@RequestMapping("/getByPage")
    public ResponseEntity<Page<Emp>> queryByPage(@RequestBody Map<String, Integer> map) {
        System.out.println(map.get("page") + map.get("size"));
        return ResponseEntity.ok(this.EmpService.queryByPage(map.get("page"), map.get("size")));
    }

2. 根据id查询

EmpService:

public Emp queryById(Integer id) {
        Emp emp = new Emp();
        emp.setId(id);
        return empDao.getOne(emp.getId());
    }

EmpController

 @PostMapping
    public ResponseEntity<Emp> add(Emp Emp) {
        return ResponseEntity.ok(this.EmpService.insert(Emp));
    }

3. 增

EmpService

public Emp insert(Emp emp) {
        empDao.save(emp);
        return emp;
    }

EmpController

@PostMapping
    public ResponseEntity<Emp> add(@RequestBody Emp Emp) {
        System.out.println(Emp);
        return ResponseEntity.ok(this.EmpService.insert(Emp));
    }

4. 删

EmpService

public Boolean deleteById(Integer id) {
        Emp emp = new Emp();
        emp.setId(id);
        empDao.deleteById(emp.getId());
        return true;
    }

EmpController

@DeleteMapping("{id}")
    public ResponseEntity<Boolean> deleteById(@PathVariable Integer id) {
        return ResponseEntity.ok(this.EmpService.deleteById(id));
    }

5. 改

EmpService

public Emp update(Emp emp) {
        empDao.save(emp);
        return emp;
    }

EmpController

@PutMapping
    public ResponseEntity<Emp> edit(@RequestBody Emp Emp) {
        return ResponseEntity.ok(this.EmpService.update(Emp));
    }

其中分页管理也可以这样写

@GetMapping
    public ResponseEntity<Page<Emp>> queryByPage(@RequestBody Map<String, Integer> map) {
        return ResponseEntity.ok(this.EmpService.queryByPage(map.get("page"), map.get("size")));
    }