What is collection mapping in Hibernate?

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.

What is Hibernate annotation?

Hibernate annotations are the newest way to define mappings without the use of XML file. You can use annotations in addition to or as a replacement of XML mapping metadata. Hibernate Annotations is the powerful way to provide the metadata for the Object and Relational Table mapping.

What is embeddable in Hibernate?

@Embeddable annotation is used to specify the Address class will be used as a component. The Address class cannot have a primary key of its own, it uses the enclosing class primary key.

What is @DynamicUpdate in Hibernate?

@DynamicUpdate is a class-level annotation that can be applied to a JPA entity. It ensures that Hibernate uses only the modified columns in the SQL statement that it generates for the update of an entity.

What is @transactional in hibernate?

A transaction simply represents a unit of work. In such case, if one step fails, the whole transaction fails (which is termed as atomicity). A transaction can be described by ACID properties (Atomicity, Consistency, Isolation and Durability).

Why is Python embeddable?

Embedding provides your application with the ability to implement some of the functionality of your application in Python rather than C or C++. This can be used for many purposes; one example would be to allow users to tailor the application to their needs by writing some scripts in Python.

What is @DynamicInsert?

The @DynamicInsert annotation is used to specify that the INSERT SQL statement should be generated whenever an entity is to be persisted. By default, Hibernate uses a cached INSERT statement that sets all table columns.

How does JPA save work?

The save operation performs a merge on the underlying EntityManager . This on its own doesn’t perform any SQL but just returns a managed version of the entity. If that isn’t already loaded into the EntityManager it might do this or it might identify the entity as a new one and make it a managed entity.