What Is an Entity Manager in Java
The Entitymanager Api Is Used to Create and Remove Persistent Entity Instances, to Find Entities by Their Primary Key, and to Query over Entities. the Set of...
The EntityManager API is used to create and remove persistent entity instances, to find entities by their primary key, and to query over entities. The set of entities that can be managed by a given EntityManager instance is defined by a persistence unit.
What does an EntityManager do?
The EntityManager is an API that manages the lifecycle of entity instances. … An EntityManager object manages a set of entities that are defined by a persistence unit. Each EntityManager instance is associated with a persistence context.
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What is managed entity?
A managed entity is a representation of a database table row (although that row doesn’t have to exist in the database yet). This is managed by the currently running Session, and every change made on it will be tracked and propagated to the database automatically.
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