Hibernate UnUniqueify表中的列

Question

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Hibernate UnUniqueify表中的列(已解决)

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我希望字段集本身不是唯一的,但是与其他字段组合是唯一的,我得到了这个表有两列(复合主键); id(主键)和object_proxy_id(主键),这正是我所需要的,但是hibernate将object_proxy_id设置为自身唯一,因此值不能在表中重复,我需要此列接受重复值.因为每个用户都有自己的对象代理,这些代理不一定是唯一的.

这就是我想要实现的目标:

|-------------------------------|
| tbl_object_proxy              |
| ------------------------------|
| Id (pk)| object_proxy_id (pk) |
|-------------------------------|
| 1      | 150 --               |
| 1      | 149  |= must be able to be DUPLICATE which is not the case right now.
| 2      | 150 --               |
| 2      | 151                  |
|-------------------------------|

当前代码:

@Entity
@Table(name = "tbl_user_settings", uniqueConstraints = {@UniqueConstraint(columnNames={"user_id"})})
@Inheritance(strategy = InheritanceType.TABLE_PER_CLASS)

public class Settings implements Serializable
{
@Id
@SequenceGenerator(name="someSequence", sequenceName="SEQ_SOMENAME", allocationSize =1)
@GeneratedValue(strategy=GenerationType.SEQUENCE, generator="someSequence")
@Column(name="id")
private int setting_id;

@OneToOne
private User user;

@ManyToOne
private SomeObject someobject;

@ElementCollection
@CollectionTable(name="tbl_collection_name", joinColumns=
@JoinColumn(name="id"), uniqueConstraints = {@UniqueConstraint(columnNames={"id", "object_proxy_id"})})
@Column(name="SomeObject")
private Set<SomeObject> objectProxy;

/*...constructors and methods...*/
}

结果是:

-- Table schema
|-------------------|                    
| tbl_user_settings |                        
|-------------------|                        
| id                |PK <<Unique>>                      
| user_id           |FK reference tbl_user <<Unique>>                        
| object_id         |FK reference tbl_object  
|-------------------|

|------------------|
| tbl_object_proxy |
|------------------|
| id               |PK reference tbl_user_settings 
| object_proxy_id  |PK reference tbl_object <<Unique>> BUT I DON'T WANT THIS TO BE UNIQUE ON ITSELF !!!!
|------------------|

编辑: tbl_object_proxy中的两个主键是复合主键
我尝试过Xeon的解决方案,但它没有用.

Answer 1

简短的回答：将 the 替换@ElementCollection为这样的@ManyToMany关系@JoinTable：

@ManyToMany
@JoinTable(
name="tbl_settings_objecteproxy_v2",
joinColumns = @JoinColumn(name = "id"),
inverseJoinColumns = @JoinColumn( name = "objectproxy_id"))
private Set<SomeObject> objectproxy;

请参阅Hibernate 注解文档中的“2.2.5.3.2.1.定义”

这会产生相同的边表，但没有唯一约束。所以现在这是可能的：

|-------------------------------|
| tbl_object_proxy              |
| ------------------------------|
| Id (pk)| object_proxy_id (pk) |
|-------------------------------|
| 1      | 150 --               |
| 1      | 149  |= It works! The unique constraint is gone! 
| 2      | 150 --               |
| 2      | 151                  |
|-------------------------------|

详细的答案和原因描述： 不知何故，@ElementCollection创建了一个具有引用键（集合|反向连接）的一对多关系的集合表，它向引用另一侧表的键添加了唯一约束，以反映我没有的一对多关系不想。所以我删除了@ElementCollection并将其替换为@ManyToMany带有@JoinTable注释的关系。我还尝试@ManyToMany在 中声明关系，@ElementCollection但它不断向引用的键添加唯一约束。

我的设置类现在看起来像这样：

@Entity
@Table(name = "tbl_user_settings", uniqueConstraints = {@UniqueConstraint(columnNames={"user_id"})})
@Inheritance(strategy = InheritanceType.TABLE_PER_CLASS)

public class Settings
{
@Id
@SequenceGenerator(name="someSequence", sequenceName="SEQ_SOMENAME", allocationSize =1)
@GeneratedValue(strategy=GenerationType.SEQUENCE, generator="someSequence")
@Column(name="id")
private int setting_id;

@OneToOne
private User user;

@ManyToOne
private SomeObject someobject;

@ManyToMany
@JoinTable(
name="tbl_settings_objecteproxy_v2",
joinColumns = @JoinColumn(name = "id"),
inverseJoinColumns = @JoinColumn( name = "objectproxy_id"))
private Set<SomeObject> objectProxy;

/*...the rest...*/
}