SpringData JPA 一对多关系配置 – 我要去巴萨

SpringData JPA 一对多关系配置

2024年4月2日2024年4月2日我要去巴萨

假如有employee和department两张表，employee表中有字段id，name，deparmentId。department有字段id，name，请用springdata jpa实现关联关系查询功能

import javax.persistence.*;

@Entity
public class Employee {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    private String name;

    @Column(name = "department_id")
    private Long departmentId;

    @ManyToOne
    @JoinColumn(name = "department_id", referencedColumnName = "id", insertable = false, updatable = false)
    @NotFound(action= NotFoundAction.IGNORE)
    @JsonIgnore
    private Department department;

    // 省略构造函数、getter和setter等
}

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

@Entity
public class Department {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    private String name;

    @OneToMany(mappedBy = "department")
    @NotFound(action= NotFoundAction.IGNORE)
    private List<Employee> employees;

    // 省略构造函数、getter和setter等
}

@NotFound(action= NotFoundAction.IGNORE) 解决关联的一方找不到报错的问题
@JsonIgnore 添加在子表对应的字段上，解决序列化时互相嵌套的问题

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