What is component mapping in hibernate?
By: Emiley J. in Hibernate Tutorials on 2008-09-02
A component is a contained object that is persisted as a value type, not an entity reference.
Example:
public class person{
private Name name;
public Name getName(){
return name;
}
public void setName(Name name){
this.name=name;
}
.....
}
public class Name {
char initial;
String first;
String last;
public char getInitial() {
return initial;
}
public void setInitial(char initial)
{
this.initial=initial;
}.......// first,last
}
Now 'Name' may be persited to the component of 'person'
in hbm:
<class name="eg.Person" table="person"> <id name="Key" column="pid" type="string"> <generator class="uuid"/> </id> <property name="birthday" type="date"/> <component name="Name" class="eg.Name"> <!-- class attribute optional --> <property name="initial"/> <property name="first"/> <property name="last"/> </component> </class>
The person table would have the columns pid, birthday, initial, first and last.
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