## 📃 JPA Hibernate Annotations

@Entity :

• This annotation is used to mark a class as an entity class.
• This annotation is used to create a table in the database.

@Entity
public class Brand {
}

@Table :

• @Table annotation is used to specify the details of the table that will be created in the database.
• The name attribute of the @Table annotation is used to specify the name of the table.

@Entity
@Table(name = "brands")
public class Brand {
}

@Column :

• @Column annotation is used to specify the details of the column that will be created in the database.
• The name attribute of the @Column annotation is used to specify the name of the column.

@Entity
@Table(name = "brands")
public class Brand {

    @Column(name = "brandName")
    private String brandName;
}

@id :

• @id annotation is used to specify the primary key of an entity.
• The @id annotation is always used with the @GeneratedValue annotation.

@Entity
@Table(name = "brands")
public class Brand {
    @Id
    @Column(name = "id")
    private int id;

}

@ManyToOne :

• @ManyToOne annotation is used to specify many to one relationship with another entity.

@Entity
@Table(name = "brands")
public class Brand {
    @ManyToOne
    @JoinColumn(name = "brandsDetails")
    private BrandDetail brandDetail;
}

@OneToMany :

• @OneToMany annotation is used to specify one to many relationship with another entity.
• The mappedBy attribute of the @OneToMany annotation is used to specify the property of the entity that is the owner of the relationship.

@Entity
@Table(name = "brands")
public class Brand {

    @OneToMany(mappedBy = "brands", fetch = FetchType.EAGER)
    private BrandDetail brandDetail;
}

@PrimaryKeyJoinColumn :

• @PrimaryKeyJoinColumn annotation is used to specify the primary key of the entity that is the owner of the relationship.

@Entity
@Table(name = "brands")
public class Brand {

    @PrimaryKeyJoinColumn
    private int id;
}

@JoinColumn :

• @JoinColumn annotation is used to specify the column that will be created in the database as a foreign key.

@Entity
@Table(name = "brands")
public class Brand {

    @JoinColumn(name = "brandDetail")
    private BrandDetail brandDetail;
}

@JoinTable ve @MapsId:

• It is used to specify the join table that will be created in the database.
• @JoinTable annotation is used to specify the join table that will be created in the database.
• @MapsId annotation is used to specify the primary key of the entity that is the owner of the relationship.

@Entity
@Table(name = "brands")
public class Brand {

    @JoinTable(name = "brands")
    private BrandDetail brandDetail;
}

@OneToOne:

• @OneToOne annotation is used to specify one to one relationship with another entity.
• The mappedBy attribute of the @OneToOne annotation is used to specify the property of the entity that is the owner of the relationship.

@Entity
@Table(name = "brands")
public class Brand {

    @OneToOne(mappedBy = "brands")
    private BrandDetail brandDetail;
}

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