Question

我试图弄清楚如何使用SpringMVC和hibernate从表单中持久保存用户输入。例如，我正在遵循本指南：

基本上它显示了一个控制器：

@Controller
public class GreetingController {

@RequestMapping(value="/greeting", method= RequestMethod.GET)
public String greetingForm(Model model) {
    model.addAttribute("greeting", new Greeting());
    return "greeting";
}

@RequestMapping(value="/greeting", method=RequestMethod.POST)
public String greetingSubmit(@ModelAttribute Greeting greeting, Model model) {
    model.addAttribute("greeting", greeting);
    return "result";
}
}

一个Greeting.java，我为JPA添加了一些注释，但我不确定该表单是否有自己的对象，我需要为问候实体创建一个单独的对象。

@Entity
@Table(name = "greeting")
public class Greeting {

@Id
@GeneratedValue
@Column(name = "greeting_id")
private long id;

@Column(name = "greeting_content")
private String content;

public long getId() {
    return id;
}

public String getContent() {
    return content;
}

public void setContent(String content) {
    this.content = content;
}
}

以及用于显示的html和仅具有starter-web和百里香叶依赖性的pom ......

我还创建了一个简单的存储库，它扩展了CrudRepository，以及目前为空的服务层。

我想弄清楚的是当单击提交按钮时如何使用hibernate将问候字段持久保存到数据库。任何帮助都会很棒，谢谢。

Answer 1

Spring CrudRepository提供save()方法。测试代码和Spring / Entity配置的简单方法可以尝试这样：

@Controller
public class GreetingController {

 //Autowire your CrudRepo of Greeting
   @Autowired
   GreetingRepository repository;

@RequestMapping(value="/greeting", method= RequestMethod.GET)
public String greetingForm(Model model) {
    model.addAttribute("greeting", new Greeting());
    //create a new Greeting() Object and set your values to it.
    //create a constructor if the values are not that much.
    Greeting greeting = new Greeting();
    greeting.setContent(yourContent);
    repository.save(greeting);
    return "greeting";
}

@RequestMapping(value="/greeting", method=RequestMethod.POST)
public String greetingSubmit(@ModelAttribute Greeting greeting, Model model) {
    model.addAttribute("greeting", greeting);
    //create a new Greeting() Object and set your values to it.
    //create a constructor if the values are not that much.
    Greeting greeting = new Greeting();
    greeting.setContent(yourContent);
    repository.save(greeting);
    return "result";
}
}

默认情况下，CrudRepository接口应该如下所示：

@Repository
public interface GreetingRepository extends CrudRepository<Greeting, Serializable>{

}

使用JPA

1 个答案: