Some more annotations in hibernate

Hi Everyone, in this blog post I am writing more about annotations used in hibernate. I hope everyone has seen my previous post about hibernate annotations - Basic Hibernate Annotations.

1) @Basic - It is the simplest type of mapping to a database column.If basic annotation is not specified for a field or property, the default values of basic annotation will apply.

2) @Transient - Specifies that the field or the property cannot be persisted.

3) @Temporal - Must be specified for persistent fields or properties of type and Date and Calendar.

4) @Lob - Used for persisting a large object to a database.

5) @Embeddable - The persistent properties or fields of the embedded object is mapped to the database table for the entity.

6) @Embedded - Specifies a field or persistent property of an entity whose value is an instance to an embeddable class.

7) @EmbeddedId - Applied to a field or persistent property of an entity class or mapped superclass to denote a composite primary key that is an embeddable class.

8) @AttributeOverride - Helps in reconfiguring all attributes. Overrides the mapping of a Basic property or field or Id.

9) @AttributeOverrides - Overrides multiple properties or fields. @AttributeOverride is written inside @AttributeOverrides.

10) @ElementCollection - Marks entire collection object to be persisted.

11) @JoinTable - It is used in the mapping of associations. Mainly used in the mapping of many-to-many and one-to-many associations. It is not mandatory to use this annotation.

12) @JoinColumn - Specifies a column for joining an entity association or element collection.

13) @CollectionId - It is hibernate specific annotation. Describes an identifies column for a bag (set, list, map). 

14) @GenericGenerator - Allows to define an hibernate specific id generator. It is also a hibernate specific annotation.

15) @Type - It is a hibernate specific annotation. @Type overrides the default hibernate type used. It is not mandatory to use type annotation.

16) @TypeDef - It is a hibernate specific annotation. This allows you to declare type definitions.

17) @OneToOne - Used for one to one mapping. It defines a single valued association to another entity that has one-to-one multiplicity. It maps a foreign key column.

18) @OneToMany - Used with collections list. Used for one to many mapping. It specifies a many valued association with one-to-many multiplicity.

19) @ManyToOne - Used for many-to-one mapping. Defines a single valued association to another entity class that has many-to-one multiplicity.

20) @ManyToMany - Used for many-to-many mapping. Defines a many valued association with many-to-many multiplicity.

I hope this post gave you a better idea about hibernate annotations. Please comment below if you have any comments/suggestions. In my future posts I will be writing programs about most of the annotations described above. Please check that out also.

Thank you for reading the post.

Similar posts

1) Basic hibernate annotations.

2) @Table and @Column annotations.