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我正在尝试使用休眠映射@ManyToMany 关联。但到目前为止，我只设法在其中一个外键上进行级联。

我的源代码是这样的：

@Entity
public class Airplane {
    @Id
    @GeneratedValue(strategy=GenerationType.AUTO)
    private Long id;

    @OnDelete(action=OnDeleteAction.CASCADE)
    @ManyToMany(mappedBy="airplanes", cascade = {CascadeType.ALL})
    private Set<Passenger> passengers;
...
}

@Entity
public class Passenger {
    @Id 
    @GeneratedValue(strategy=GenerationType.AUTO)
    private Long id;

    @OnDelete(action=OnDeleteAction.CASCADE)
    @ManyToMany(cascade = {CascadeType.ALL})
    private Set<Airplane> airplanes;
...
}

hibernatetool 输出：

create table Airplane (
    id bigint not null auto_increment,
    objVersion bigint,
    primary key (id)
) type=InnoDB;

create table Passenger (
    id bigint not null auto_increment,
    objVersion bigint,
    primary key (id)
) type=InnoDB;

create table Passenger_Airplane (
    passengers_id bigint not null,
    airplanes_id bigint not null,
    primary key (passengers_id, airplanes_id)
) type=InnoDB;

alter table Passenger_Airplane 
    add index FKC9262997C1630114 (airplanes_id), 
    add constraint FKC9262997C1630114 
    foreign key (airplanes_id) 
    references Airplane (id) 
    on delete cascade;

alter table Passenger_Airplane 
    add index FKC92629979BEE2B2 (passengers_id), 
    add constraint FKC92629979BEE2B2 
    foreign key (passengers_id) 
    references Passenger (id);

不知何故，Passenger 类上的 @OnDelete(action=OnDeleteAction.CASCADE) 注释被休眠丢弃了。

4

1 回答 1

0

嗯，不确定这是否有效。请参阅HHH-4404中非常古老的评论。

于 2010-01-26T08:44:14.393 回答