Hibernate Cheat Sheet – DEV Community

## 📃 JPA Hibernate Annotations

@Entity :

• This annotation is used to mark a category as an entity class.
• This annotation is used to create a desk within the database.

@Entity
public class Model {
}

@Desk :

• @Desk annotation is used to specify the main points of the desk that will likely be created within the database.
• The identify attribute of the @Desk annotation is used to specify the identify of the desk.

@Entity
@Desk(identify = "manufacturers")
public class Model {
}

@Column :

• @Column annotation is used to specify the main points of the column that will likely be created within the database.
• The identify attribute of the @Column annotation is used to specify the identify of the column.

@Entity
@Desk(identify = "manufacturers")
public class Model {

    @Column(identify = "brandName")
    personal String brandName;
}

@id :

• @id annotation is used to specify the first key of an entity.
• The @id annotation is at all times used with the @GeneratedValue annotation.

@Entity
@Desk(identify = "manufacturers")
public class Model {
    @Id
    @Column(identify = "id")
    personal int id;

}

@ManyToOne :

• @ManyToOne annotation is used to specify many to 1 relationship with one other entity.

@Entity
@Desk(identify = "manufacturers")
public class Model {
    @ManyToOne
    @JoinColumn(identify = "brandsDetails")
    personal BrandDetail brandDetail;
}

@OneToMany :

• @OneToMany annotation is used to specify one to many relationship with one other entity.
• The mappedBy attribute of the @OneToMany annotation is used to specify the property of the entity that’s the proprietor of the connection.

@Entity
@Desk(identify = "manufacturers")
public class Model {

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

@PrimaryKeyJoinColumn :

• @PrimaryKeyJoinColumn annotation is used to specify the first key of the entity that’s the proprietor of the connection.

@Entity
@Desk(identify = "manufacturers")
public class Model {

    @PrimaryKeyJoinColumn
    personal int id;
}

@JoinColumn :

• @JoinColumn annotation is used to specify the column that will likely be created within the database as a overseas key.

@Entity
@Desk(identify = "manufacturers")
public class Model {

    @JoinColumn(identify = "brandDetail")
    personal BrandDetail brandDetail;
}

@JoinTable ve @MapsId:

• It’s used to specify the be part of desk that will likely be created within the database.
• @JoinTable annotation is used to specify the be part of desk that will likely be created within the database.
• @MapsId annotation is used to specify the first key of the entity that’s the proprietor of the connection.

@Entity
@Desk(identify = "manufacturers")
public class Model {

    @JoinTable(identify = "manufacturers")
    personal BrandDetail brandDetail;
}

@OneToOne:

• @OneToOne annotation is used to specify one to 1 relationship with one other entity.
• The mappedBy attribute of the @OneToOne annotation is used to specify the property of the entity that’s the proprietor of the connection.

@Entity
@Desk(identify = "manufacturers")
public class Model {

    @OneToOne(mappedBy = "manufacturers")
    personal BrandDetail brandDetail;
}

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