我英语很差，但我正在尝试描述我的问题。
我是春天的新人。我在向数据库添加数据时遇到一些问题。我必须表 PC 和 PC 特征。它们通过 Id 关联。在非关联表中添加数据很容易，但是如何在关联表中添加数据呢？我应该在控制器中写什么？下面有一些类。
电脑类：
@Entity
@Table(name = "pc")
public class Pc {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private int id;
private String name;
private int price;
public Pc(){}
public Pc(String name, int price) {
this.name = name;
this.price = price;
}
@OneToMany
@JoinColumn(name = "pc_id")
private List<PcChars> chars = new ArrayList<>();
public List<PcChars> getChars() {
return chars;
}
public void setChars(List<PcChars> chars) {
this.chars = chars;
}
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 getPrice() {
return price;
}
public void setPrice(int price) {
this.price = price;
}
PCChars 类：
@Entity
@Table(name = "pcChars")
public class PcChars {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private int id;
private String name;
private String value;
public PcChars(){}
public PcChars(String name, String value) {
this.name = name;
this.value = value;
}
@ManyToOne
private Pc pc;
public Pc getPc() {
return pc;
}
public void setPc(Pc pc) {
this.pc = pc;
}
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 String getValue() {
return value;
}
public void setValue(String value) {
this.value = value;
}
PC角色控制器：
@Controller
public class PcCharactsController {
final private PcRepo pcRepo;
final private PcCharRepo pcCharRepo;
public PcCharactsController(PcRepo pcRepo, PcCharRepo pcCharRepo) {
this.pcRepo = pcRepo;
this.pcCharRepo = pcCharRepo;
}
//Pc characteristics list
@GetMapping("pc/{id}/")
public String pcCharList(@PathVariable int id, Model model) throws Exception{
Pc pc = pcRepo.findById(id).orElseThrow(() -> new Exception("PostId " +
id + " not found"));
List<PcChars> pcChars = pc.getChars();
model.addAttribute("model", pc.getName());
model.addAttribute("pcChars", pcChars);
return "charList";
}
//add characteristic
@PostMapping("pc/{id}/")
public String addCharact(){
return "charList";
}
特点.ftl:
<html>
<head>
<title>Ho</title>
</head>
<body>
<div>
<form method="post" action="/pc/${id}/">
<input type="text" name="name">
<input type="text" value="value">
<input type="hidden" name="pc_id" value="${id}">
<button type="submit">Add</button>
</form>
</div>
</body>
</html>
