Menu-many of which Role
Entity Relationship Diagram .png
public class User implements Serializable {
@Id
private Long id;
private String name;
private String password;
private String phone;
private Integer age;
@Column(name = "role_id")
private String roleId;
@OneToOne(cascade = CascadeType.DETACH, fetch = FetchType.LAZY)
@JoinColumn(name = "role_id", referencedColumnName = "id", insertable = false, updatable = false)
private Role role;
@OneToMany(mappedBy = "user",cascade = CascadeType.DETACH, fetch = FetchType.LAZY)
private List<LoginLog> loginLogList;
}
@JsonIgnoreProperties(value = {"hibernateLazyInitializer", "handler"})
public class Role implements Serializable {
@Id
private Long id;
private String name;
private Long sort;
@ManyToMany(fetch = FetchType.LAZY)
@JoinTable(name = "sys_role_menu", joinColumns = {@JoinColumn(name = "roleId", referencedColumnName = "id")},
inverseJoinColumns = {@JoinColumn(name = "menuId", referencedColumnName = "id")})
private List<Menu> menuList;
}
public class Menu {
@Id
private Long id;
private String name;
private String url;
private String icon;
}
public class RoleMenu {
@Id
private Long Id;
private Long RoleId;
private Long MenuId;
}
public class LoginLog implements Serializable {
@Id
private Long id;
private String userId;
private String log;
private Date createTime;
@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name = "userId",insertable = false,updatable = false)
private User user;
}
User and LoginLog equipped with two-way association, the use is likely to cause a circular reference problem, to prevent this problem, the Internet is common practice to add
@JsonIgnore notes, in fact, you can use this without comment, but try to avoid calling the cycle getUser () , getLoginLogList () method.
When the query directly out of the entity classes json serialization, lazy loading is activated, getUser (), etc. is called, this time will result in a circular reference problem.
