What are the different collections supported by Hibernate
- List — > ArrayList,LinkedList etc.
- Set –> Treeset,HashSet etc.
- Map –> HashMap etc.
What are different types of mapping in hibernate?
Primitive Types
| Mapping type | Java type | ANSI SQL Type |
|---|---|---|
| integer | int or java.lang.Integer | INTEGER |
| long | long or java.lang.Long | BIGINT |
| short | short or java.lang.Short | SMALLINT |
| float | float or java.lang.Float | FLOAT |
What is collection mapping in hibernate?
Hibernate supports collection mapping as value type. In this mapping, the collection are mapped into a separate table. When we have to persist property of a class, which is of data type like integer, long, float etc. or objects of wrapper classes or Strings, these properties are stored in the table of class directly.
Which collection is not supported by Hibernate?
Please note that Hibernate does not support bidirectional one-to-many associations with an indexed collection (list, map or array) as the “many” end, you have to use a set or bag mapping.
What are the different fetching strategies in Hibernate?
Different Fetch modes supported by Hibernate
- 1) FetchMode JOIN.
- 2) FetchMode SELECT(default)
- 3) FetchMode SELECT with Batch Size.
- 4) FetchMode SUBSELECT.
- Code to define the fetching strategy.
- FetchMode JOIN.
- FetchMode SELECT(default)
- FetchMode SELECT with Batch Size.
What is collection mapping?
Collection mapping is the process of examining the quantity and quality of your collection and identifying its strengths and weaknesses. A collection map is a visual supplement to the automated catalog system that graphically displays the breath and depth of the collection.
What is lazy loading in Hibernate?
Lazy loading is a fetching technique used for all the entities in Hibernate. It decides whether to load a child class object while loading the parent class object. The main purpose of lazy loading is to fetch the needed objects from the database.
Which technique is used by Hibernate to persist collections of embeddable types?
Just like the collection of basic type, a collection of embeddable class can be persisted by using @ElementCollection on the collection reference in the entity class.
What is FetchType lazy?
FetchType. LAZY – Fetch it when you need it. The FetchType. LAZY tells Hibernate to only fetch the related entities from the database when you use the relationship. This is a good idea in general because there’s no reason to select entities you don’t need for your uses case.
