@Target(value={METHOD,FIELD}) @Retention(value=RUNTIME) public @interface ManyToOne
OneToMany
entity side must use the mappedBy
element to specify the relationship field or property of
the entity that is the owner of the relationship.
The ManyToOne
annotation may be used within an embeddable class to specify a relationship from
the embeddable class to an entity class. If the relationship is bidirectional, the non-owning
OneToMany
entity side must use the mappedBy
element of the OneToMany
annotation to specify the relationship field or property of the embeddable field or property on the owning
side of the relationship. The dot (".") notation syntax must be used in the mappedBy
element
to indicate the relationship attribute within the embedded attribute. The value of each identifier used
with the dot notation is the name of the respective embedded field or property.
Example 1: @ManyToOne(optional=false) @JoinColumn(name="CUST_ID", nullable=false, updatable=false) public Customer getCustomer() { return customer; } Example 2: @Entity public class Employee { @Id int id; @Embedded JobInfo jobInfo; ... } @Embeddable public class JobInfo { String jobDescription; @ManyToOne ProgramManager pm; // Bidirectional } @Entity public class ProgramManager { @Id int id; @OneToMany(mappedBy="jobInfo.pm") Collection<Employee> manages; }
Modifier and Type | Optional Element and Description |
---|---|
CascadeType[] |
cascade
(Optional) The operations that must be cascaded to the target of the association.
|
FetchType |
fetch
(Optional) Whether the association should be lazily loaded or must be eagerly fetched.
|
boolean |
optional
(Optional) Whether the association is optional.
|
Class |
targetEntity
(Optional) The entity class that is the target of the association.
|
public abstract Class targetEntity
Defaults to the type of the field or property that stores the association.
public abstract CascadeType[] cascade
By default no operations are cascaded.
public abstract FetchType fetch
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