Hibernate Annotations (2)

EmbeddedId)

Master Table

@ Entity
Public class A implements Serializable ...{

@ EmbeddedId
Private AId aId;

Public AId getAId ()...{
Return aId;
    }

Public void setAId (AId aId )...{
This. aId = aId;
    }
}
Composite primary key

 

@ Embeddable
Public class AId implements Serializable ...{

@ OneToOne
@ JoinColumn (name = "bid ")
Private B;

@ OneToOne
@ JoinColumn (name = "cid ")
Private C c;

Public B getB ()...{
Return B;
    }

Public void setB (B B )...{
This. B = B;
    }

Public C getC ()...{
Return c;
    }

Public void setC (C c )...{
This. c = c;
    }
}
Join table

 

@ Entity
Public class B ...{

@ Id
@ GeneratedValue
Private Long id;

Public Long getId ()...{
Return id;
    }

Public void setId (Long id )...{
This. id = id;
    }
}

@ Entity
Public class C ...{

@ Id
@ GeneratedValue
Private Long id;

Public Long getId ()...{
Return id;
    }

Public void setId (Long id )...{
This. id = id;
    }
}
Application of compound primary key (IdClass)

Master Table

 

@ Entity
@ IdClass (OrderLinePk. class)
Public class OrderLine ...{
@ Id
Public Order order;
@ Id
Public Product product;
}
Primary key

 

Public class OrderLinePk implements Serializable ...{
@ ManyToOne
@ JoinColumn (name = "foo", nullable = false)
Public Order order;
@ ManyToOne
@ JoinColumn (name = "bar", nullable = false)
Public Product product;
}

Join table

 

@ Entity
Public class Product ...{
@ Id
Public String name;
}

@ Entity
@ Table (name = "OrderTableFoobar ")
Public class Order ...{
@ Id
@ GeneratedValue
Public Integer id;
}