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Java EE 5 SDK 深圳电信培训中心.徐海蛟老师. |
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上一个类 下一个类 | 框架 无框架 | ||||||||
摘要: REQUIRED | OPTIONAL | 详细信息: ELEMENT |
javax.persistence Annotation Type AssociationOverride
This annotation is used to override a many-to-one or one-to-one mapping of property or field for an entity relationship.
The AssociationOverride
annotation may be applied
to an entity that extends a mapped superclass to override a many-to-one
or one-to-one mapping defined by the mapped superclass. If the
AssociationOverride
annotation is not specified, the join
column is mapped the same as in the original mapping.
Example: @MappedSuperclass public class Employee { ... @ManyToOne protected Address address; ... } @Entity @AssociationOverride(name="address", joinColumns=@JoinColumn(name="ADDR_ID")) // address field mapping overridden to ADDR_ID fk public class PartTimeEmployee extends Employee { ... }
- 从以下版本开始:
- Java Persistence 1.0
- 另请参见:
OneToOne
,ManyToOne
,MappedSuperclass
Required Element Summary | |
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JoinColumn[] |
joinColumns
The join column that is being mapped to the persistent attribute. |
String |
name
The name of the relationship property whose mapping is being overridden if property-based access is being used, or the name of the relationship field if field-based access is used. |
元素详细信息 |
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name
public abstract String name
- The name of the relationship property whose mapping is
being overridden if property-based access is being used,
or the name of the relationship field if field-based access is used.
joinColumns
public abstract JoinColumn[] joinColumns
- The join column that is being mapped to the persistent
attribute. The mapping type will remain the same as is defined
in the mapped superclass.
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Java EE 5 SDK 深圳电信培训中心.徐海蛟老师. |
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上一个类 下一个类 | 框架 无框架 | ||||||||
摘要: REQUIRED | OPTIONAL | 详细信息: ELEMENT |
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