java - 如何让mysql中的列保存Java类

Question

您好，我正在尝试使用 Spring Boot 和 JPA 在 MySQL 中创建一个表，并且我正在尝试将表中的一列设为 Java 类，即 JSON 对象，有什么方法可以做到这一点吗？此解决方案的任何示例或文档。

我制作的表格示例

import com.project.something.here.Userdata

@Entity
@Table(name = "User")
public class Exercises {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private String id;
    @Column(name = "user_name")
    private String username;
    @Column(name = "user_description")
    private String userdescription;
    @Column(name = "user_link")
    private String userlink;

    //here is where I am trying to set one of the columns as a Java class or a JSON object.
    private Userdata userdata;

Answer 1

我相信您更关注 JPA 中的一对一映射。请看一下:https://www.baeldung.com/jpa-one-to-one

请看看是否对您有帮助。

import com.project.something.here.Userdata;

@Entity
@Table(name = "User")
public class Exercises {
    // ...

    @OneToOne(cascade = CascadeType.ALL)
    @JoinColumn(unique = true)
    private Userdata userdata;

    // ...
}

用户数据.java

@Entity
@Table(name = "userdata")
public class Userdata {

    @Id
    @Column(name = "id")
    private Long id;

    //...

    @OneToOne(mappedBy = "userdata")
    private Exercises exercises;

    //... getters and setters
}