How do you use jpa delete?

In JPA, deleting entity objects can be done in two ways:

Use the remove() method of EntityManager.

entityManager.remove(entity);

In this process, you first need to retrieve the entity object you want to delete, and then remove it from the database using the remove() method.

2. Using the DELETE statement in JPQL (Java Persistence Query Language):

String jpql = "DELETE FROM EntityName e WHERE e.id = :id";
Query query = entityManager.createQuery(jpql);
query.setParameter("id", entityId);
int deletedCount = query.executeUpdate();

In this way, you can specify the entity type and deletion criteria in the DELETE statement of JPQL, and then execute the deletion operation using the executeUpdate() method. Variables in the deletion criteria can be set using parameters.

It is important to note that both of the above methods only remove the entity object from the database, and the actual deletion operation will not take place until the transaction is committed.