Hibernate Cheat Sheet
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Burak Boduroğlu

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Hibernate Cheat Sheet

Publish Date: Nov 12 '23
38 2

📃 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 {
}
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@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 {
}
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@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;
}
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@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;

}
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@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;
}
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@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;
}
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@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;
}
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@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;
}
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@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;
}
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@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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