Hibernate Cheat Sheet

#java #webdev #hibernate #springboot

📃 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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