插入多对一关系

Question

大家好，我有两节课

Admins.java

package com.spark.entites;

import javax.persistence.CascadeType;
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.ManyToOne;


import com.fasterxml.jackson.annotation.JsonView;
import com.spark.View;

@Entity
public class Admins {

@Id
@GeneratedValue(strategy = GenerationType.AUTO)
@JsonView(View.all.class)
private int idu;
@JsonView(View.all.class)
private String logins;
@JsonView(View.all.class)
private String password;
@JsonView(View.all.class)
@ManyToOne(fetch = FetchType.EAGER, cascade = CascadeType.MERGE)
@JoinColumn(name = "idr")
private Role role;

public int getIdu() {
    return idu;
}

public void setIdu(int idu) {
    this.idu = idu;
}

public String getLogins() {
    return logins;
}

public void setLogins(String logins) {
    this.logins = logins;
}

public String getPassword() {
    return password;
}

public void setPassword(String password) {
    this.password = password;
}



public Admins(int idu, String logins, String password, Role role) {
    super();
    this.idu = idu;
    this.logins = logins;
    this.password = password;
    this.role = role;
}

public Admins() {
    super();
}

}

和 Role.java

@Entity
public class Role {


@Id
@GeneratedValue(strategy=GenerationType.AUTO)
@JsonView(View.all.class)
private int idr ; 
@JsonView(View.all.class)
private String role ;
public int getIdr() {
    return idr;
}
public void setIdr(int idr) {
    this.idr = idr;
}
public String getRole() {
    return role;
}
public void setRole(String role) {
    this.role = role;
}
public Role(int idr, String role) {
    super();
    this.idr = idr;
    this.role = role;
}
public Role() {
    super();
} 

如您所见，我与这两个类有manyToOne 关系，我正在使用spring-boot 我有这样的存储库：

public interface AdminRepository extends JpaRepository<Admins, Integer>{
}

在控制器中：

@RestController
public class AdminsController {

@Autowired
AdminRepository adminRepository;

// this one to load R
@JsonView(View.all.class)
@RequestMapping(value = "/Admins/load")
public List<Admins> load() {
    return adminRepository.findAll();
}

@RequestMapping(value = "/Admins/insert")
public void insertusers(Admins a) {
    adminRepository.save(a);
}

}

在我的控制器中，当我尝试像这样插入 idr 值时，我有 2 个要加载的函数和要插入的函数：

http://localhost:8080/Admins/insert?logins=yosra&password=yossra&role.idr=1

我正在获取角色 null 的值

{
idu: 23,
logins: "yosra",
password: "yossra",
role: null
} 

应该是这样的：

{
idu: 3,
logins: "bassem",
password: "admin",
role: {
idr: 1,
role: "Admin"
}
}

感谢任何帮助。

Answer 1

尝试在Admins.class 中为字段role 添加getter 和setter，或者在Admins.class 的注解@Entity 中添加属性access = AccessType.FIELD。