关于删除Cascade Hibernate ManyToMany

Question

我希望UserAcounts能够拥有许多UserGroup.并且所有组都可以有许多Users.And有一个连接表.我希望在删除useraccount时删除连接表中useraccount和usergroup之间的关联.

实际上我想使用"删除级联".在ManyToMany关系中,我不幸运行它.我已经尝试了很多东西,但我找不到解决方案.

注意:我只想在删除级联时删除Relation

是否有办法做到这一点？

这是我的hibernate类

@SuppressWarnings("serial")
@Entity
@Table(name = "USER_ACCOUNT")
public class UserAccount implements Serializable {

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

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

@Column(name = "SURNAME")
private String surname;

@Column(name = "EMAIL")
private String email;

@Column(name = "USER_NAME")
private String username;

@Column(name = "PASSWORD")
private String password;

@Column(name = "ENABLED")
@Type(type = "yes_no")
private boolean enabled;

@Column(name = "ACCOUNT_NON_EXPIRED")
@Type(type = "yes_no")
private boolean accountNonExpired;

@Column(name = "CREDENTIALS_NON_EXPIRED")
@Type(type = "yes_no")
private boolean credentialsNonExpired;

@Column(name = "ACCOUNT_NON_LOCKED")
@Type(type = "yes_no")
private boolean accountNonLocked;

@Column(name = "ENTRY_DATE")
private Date entryDate;

@Column(name = "UPDATE_DATE")
private Date updateDate;

@Column(name = "LAST_LOGIN_DATE")
private Date lastLoginDate;

@Column(name = "LOCAL")
private String local;

@ManyToMany(cascade = CascadeType.ALL,fetch=FetchType.EAGER)
@JoinTable(name = "ACCOUNT_GROUP", joinColumns = { @JoinColumn(name = "ID") }, inverseJoinColumns = { @JoinColumn(name = "GROUP_ID") })
private List<UserGroup> userGroups;








@SuppressWarnings("serial")
@Entity
@Table(name = "USER_GROUP")
public class UserGroup implements Serializable {

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

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

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

我研究得太多但我无法运行它.

Answer 1

设置为DELETE的级联在删除用户时不会删除组与用户之间的关联.它会自己删除这些组.

要删除关联,您只需在删除用户之前从用户组中删除所有组:

user.getUserGroups().clear();
session.delete(user);

从用户中删除组将删除联接表中的关联.