Hibernate is smart enough not to send insert/updates to the Database until it knows if the transaction will be committed or rolled back. Lets understand the different Transaction : When you make a session session. save(a) Hibernate essentially remembers that this object needs to be saved somewhere inside the session. It may determine whether INSERT […]
Catégorie: JPA & Hibernate
how do I persist a String into a database field, type MYSQL Text (JPA)
Error : Solution: Lob Annotation A Lob annotation specifies that a persistent property or field should be persisted as a large object to a database-supported large object type. Portable applications should use the Lob annotation when mapping to a database Lob type. The Lob annotation may be used in conjunction with the Basic annotation. A […]
How to Annotating List of Enums in Hibernate
IF you want to annotate a List of Enums in Hibernate the solution will be :
JPA Associations
JPA ASSOCIATIONS : Il existe plusieurs type d’associations entre entités :• One to One (1:1) -Unidirectionnelle / Bidirectionnelle• One to Many (1:N) -Unidirectionnelle / Bidirectionnelle• Many to One (N:1) -Unidirectionnelle / Bidirectionnelle• Many to Many (N:M) -Unidirectionnelle / Bidirectionnelle– TP : Mise en oeuvre des différentes associations JPA ASSOCIATIONS : • One To One entre […]
@OneToMany : Mapping hibernate data is getting inserted in child table while updating parent table
Why in “One to Many” Mapping hibernate data is getting inserted in child table while updating parent table ? Solution : You are using cascade = CascadeType.ALL in both @OneToMany mappings of your Sets. This means that whatever operation done on the parent entity, will be propagate also to the child entity That is when […]
Solution for : Why hibernate does not insert into child table ?
If Hibernate does not insert element in child table , The reason is because the mapping does not cascade the persist operation. Example : The solution is : Cascade operations are extremely useful, but be mindful of their potential side effects, particularly if you modify Ticket which you don’t intend for an operation to be […]
(SOLVED) “object references an unsaved transient instance”
How to fix the Hibernate “object references an unsaved transient instance – save the transient instance before flushing” error ! SOLUTION : You should include on your collection mapping: (if using xml) or (if using annotations) This happens because you have a collection in your entity, and that collection has one or more items which […]
(SOLVED) No Session found for current thread
Request processing failed; nested exception is org.hibernate.HibernateException: No Session found for current thread Solution : If you have this exception using Hibernate , that mean that you forgot the annotation @Transaction in your service implement class function that caused this Exception.