为什么我在创建 Todo 实体时得到的日期为空？

Question

我的待办事项应用程序有什么问题？我希望用户能够添加待办事项并在创建时将其保存在我的 MySQL 数据库中，但我不知道我做错了什么。

我刚开始学习 Springboot，如果有任何建议或建议，我将不胜感激。

待办实体：


import com.fasterxml.jackson.annotation.JsonFormat;
import lombok.NoArgsConstructor;
import org.hibernate.annotations.CreationTimestamp;

import javax.persistence.*;
import java.util.Date;


@Entity(name = "Todo")
@NoArgsConstructor
@Table(name = "todos")
public class Todo {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "id")
    private int id;

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

    @Column(name="target_date")
    @CreationTimestamp
    private Date targetDate;

    public Todo(String description) {
        this.description = description;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getDescription() {
        return description;
    }

    public void setDescription(String description) {
        this.description = description;
    }

    public Date getTargetDate() {
        return targetDate;
    }

    public void setTargetDate(Date targetDate) {
        this.targetDate = targetDate;
    }

    @Override
    public String toString() {
        return "Todo{" +
                "id=" + id +
                ", description='" + description + '\'' +
                ", targetDate=" + targetDate +
                '}';
    }
}

使用 Spring 数据 JPA 添加 Todo


import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.Modifying;
import org.springframework.data.jpa.repository.Query;
import org.springframework.data.repository.query.Param;
import org.springframework.stereotype.Component;
import org.springframework.stereotype.Repository;

import javax.transaction.Transactional;
import java.util.List;

@Repository
@Component
public interface TodoRepository extends JpaRepository<Todo, Integer> {

    @Modifying
    @Query(value = "INSERT INTO todos (description) VALUES (:description)", nativeQuery=true)
    @Transactional
    void addTodo(@Param("description") String description);

}

TodoController

@RestController
@RequestMapping(value = "/api/v1/todos")
@AllArgsConstructor
public class TodoController {

    @Autowired
    private ITodoService todoService;

    @PostMapping(value = "/add-todo")
    public String addTodo(@RequestParam String description) {
        Todo todo = new Todo();
        todo.setDescription(description);
        todoService.addTodo(todo);

        return todo.toString();
    }

收到 post 请求后，target_date 在 MySQL

中变为 NULL

Answer 1

我假设你可以使用 persist():

来解决它

@Autowired EntityManager entityManager;

@PostMapping(value = "/add-todo")
    public String addTodo(@RequestParam String description) {
        Todo todo = new Todo();
        todo.setDescription(description);
        entityManager.persist(todo);

        return todo.toString();
    }

为什么我在创建 Todo 实体时得到的日期为空？

Why am I getting null for the date when I create a Todo entity?

hibernate

spring-data-jpa

spring-boot