Unidirectional Many-To-Many Relationship with Join Tables in Hibernate

In unidirectional association, we will have navigation only in one direction, i.e, only one side of the association will have the reference to the other side. The one side of the association will implement one of the collection interfaces, if it has the reference to the other entity.

In many to many relationship, multiple target objects can have relationship with multiple source objects. Let’s consider CD and Artist. So only one Artist can write multiple CD or a CD can be written by multiple Artists. So we will create three tables CD, Artist and CDArtist in the database and we will see how many-to-many relationship works step by step. Continue reading “Unidirectional Many-To-Many Relationship with Join Tables in Hibernate”

Unidirectional One-To-One Relationship with Join Tables in Hibernate

In unidirectional association, we will have navigation only in one direction, i.e, only one side of the association will have the reference to the other side. The one side of the association will implement one of the collection interfaces, if it has the reference to the other entity.

In one to one relationship, single target object can have relationship with only one source object. Let’s consider CD and Artist. So only one Artist can write only one CD. So we will create three tables CD, Artist and CDArtist in the database and we will see how one-to-one relationship works step by step.

A unidirectional one-to-one association on a join table is possible, but extremely unusual. Continue reading “Unidirectional One-To-One Relationship with Join Tables in Hibernate”

Unidirectional Many-To-One Relationship with Join Tables in Hibernate

In unidirectional association, we will have navigation only in one direction, i.e, only one side of the association will have the reference to the other side. The one side of the association will implement one of the collection interfaces, if it has the reference to the other entity.

In many to one relationship, multiple target objects can have relationship with same source object. Let’s consider CD and Artist. So many Artists can write only one CD. So we will create three tables CD, Artist and CDArtist in the database and we will see how many-to-one relationship works step by step.

A unidirectional many-to-one association on a join table is common when the association is optional. Continue reading “Unidirectional Many-To-One Relationship with Join Tables in Hibernate”

Unidirectional One-To-Many Relationship with Join Tables in Hibernate

In unidirectional association, we will have navigation only in one direction, i.e, only one side of the association will have the reference to the other side. The one side of the association will implement one of the collection interfaces, if it has the reference to the other entity.

In one to many relationship, multiple target objects can have relationship with same source object. Let’s consider CD and Artist. So many Artists can write only one CD. So we will create three tables CD, Artist and CDArtist in the database and we will see how one-to-many relationship works step by step.

A unidirectional one-to-many association on a join table is to specify unique=”true” which changes the multiplicity from many-to-many to one-to-many. Continue reading “Unidirectional One-To-Many Relationship with Join Tables in Hibernate”

Unidirectional One-To-One Relationship on Primary Key in Hibernate

In unidirectional association, we will have navigation only in one direction, i.e, only one side of the association will have the reference to the other side.

In one to one relationship, one source object can have relationship with only one target object. Let’s consider CD and Artist. So one CD can be written by one Artist or an Artist can write only one CD. So we will create two tables CD and Artist in the database and we will see how one-to-one relationship works step by step.

Now we will apply one-to-one relationship. So only one CD can be written by only one Artist.

In One-To-One relationship on primary key CD table and Artist table have cdId as primary keys, where primary key cdId in Artist table is a reference to CD table. Continue reading “Unidirectional One-To-One Relationship on Primary Key in Hibernate”

Unidirectional One-To-One Relashionship on Foreign Key in Hibernate

In unidirectional association, we will have navigation only in one direction, i.e, only one side of the association will have the reference to the other side.

In one to one relationship, one source object can have relationship with only one target object. Let’s consider CD and Artist. So one CD can be written by one Artist or only one Artist can write only one CD. So we will create two tables CD and Artist in the database and we will see how one-to-one relationship works step by step.

Now we will apply one-to-one relationship. So only one CD can be written by only one Artist. Continue reading “Unidirectional One-To-One Relashionship on Foreign Key in Hibernate”

Unidirectional Many-To-One Relationship in Hibernate

In unidirectional association, we will have navigation only in one direction, i.e, only one side of the association will have the reference to the other side. The one side of the association will implement one of the collection interfaces, if it has the reference to the other entity.

In many to one relationship, multiple source objects can have relationship with same target object. Let’s consider CD and Artist. So multiple CDs can be written by same Artist or multiple Artists can write the same CD. So we will create two tables CD and Artist in the database and we will see how many-to-one relationship works step by step.

Now we will apply many-to-one relationship. So multiple CDs can be written by same Artist. Continue reading “Unidirectional Many-To-One Relationship in Hibernate”