在数据库中获取嵌入式地址实体的空值。使用MySql数据库。用户实体可以很好地存储值，但是嵌入式地址实体返回的是空值，无法弄清为什么它不起作用。我是一个初学者，尝试过到处搜索，但没有运气。只是Api的新手，但它无法像我想要的那样令人讨厌。
模型类
package com.example.demo;
import javax.persistence.Embedded;
import javax.persistence.Entity;
import javax.persistence.Id;
@Entity
public class User {
@Id
private int id;
private String name;
@Embedded
private Address address;
public User() {
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String toString() {
return "user [id=" + id + ", name=" + name + ",Address="+address+" ]";
}
public User(int id, String name, Address address) {
this.id = id;
this.name = name;
this.address = address;
}
public Address getAddress() {
return address;
}
public void setAddress(Address address) {
this.address = address;
}
}
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**Model class**
package com.example.demo;
import javax.persistence.Embeddable;
@Embeddable
public class Address {
private String cityname;
private String streetname;
private String Housename;
public Address() {
}
public Address(String cityname, String streetname, String housename) {
super();
this.cityname = cityname;
this.streetname = streetname;
Housename = housename;
}
public String getStreetname() {
return streetname;
}
public void setStreetname(String streetname) {
this.streetname = streetname;
}
public String getHousename() {
return Housename;
}
public void setHousename(String housename) {
Housename = housename;
}
public String getCityname() {
return cityname;
}
public void setCityname(String cityname) {
this.cityname = cityname;
}
}
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**controller class**
package com.example.demo;
import java.util.List;
import java.util.Optional;
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.RequestParam;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class Croller {
@Autowired
TestRepo repo;
@PostMapping("/add")
public String save(@RequestBody User mode) {
repo.save(mode);
return "details saved";
}
@GetMapping("/get")
public List<User> retrive(){
return repo.findAll();
}
@GetMapping("/search")
public List<User> searchname(@RequestParam("name")String name){
return repo.name(name);
}
@GetMapping("/byid/{id}")
public Optional <User> getone (@PathVariable int id){
return repo.findById(id);
}
@PutMapping("/update")
public String updateid(@RequestBody User mode ) {
repo.save(mode);
return " user updated sucessfully";
}
@DeleteMapping("/remove/{id}")
public String delete(@PathVariable int id) {
repo.deleteById(id);
return "deleted with the given id:"+ id;
}
}
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Repository
package com.example.demo;
import java.util.List;
import org.springframework.data.jpa.repository.JpaRepository;
public interface TestRepo extends JpaRepository <User, Integer> {
List <User> name(String name);
}
**Application.java**
package com.example.demo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class Demoapi2Application {
public static void main(String[] args) {
SpringApplication.run(Demoapi2Application.class, args);
}
}
