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The next line uses the entity manager to persist the entity Calling persist() is all that is required to initiate it being persisted in the database If the entity manager encounters a problem doing this, then it will throw an unchecked PersistenceException When the persist() call returns, emp will have become a managed entity within the entity manager s persistence context Listing 2-3 shows how to incorporate this into a simple method that creates a new employee and persists it to the database Listing 2-3 Method for Creating an Employee public Employee createEmployee(int id, String name, long salary) { Employee emp = new Employee(id); empsetName(name); empsetSalary(salary); empersist(emp); return emp; } This method assumes the existence of an entity manager in the em field of the instance and uses it to persist the Employee.

Note that we do not need to worry about the failure case in this example It will result in a runtime PersistenceException being thrown, which will get propagated up to the caller..

Before an object is saved. The object s state should not be tampered with at this point. Immediately before the Session is flushed. During a call to flush() after entities have been determined to be dirty. After the Session is flushed, if and only if the Session had to carry out SQL operations to synchronize state with the database. Immediately prior to the completion of a transaction. This method can change the state of the transaction for example, it can call rollback().

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Once an entity is in the database, the next thing one typically wants to do is find it again. In this section, we will show how an entity can be found using the entity manager. There is really only one line that we need to show: Employee emp = em.find(Employee.class, 158);

We are passing in the class of the entity that is being sought (in this example, we are looking for an instance of Employee) and the id or primary key that identifies the particular entity (in our case we want to find the entity that we just created). This is all the information needed by the entity manager to find the instance in the database, and when the call completes, the employee that gets returned will be a managed entity, meaning that it will exist in the current persistence context associated with the entity manager. Passing in the class as a parameter also allows the find method to be parameterized and return an object of same type that was passed in, saving the caller an extra cast. What happens if the object has been deleted or if we supplied the wrong id by accident In the event that the object was not found, then the find() call simply returns null. We would need to ensure that a null check is performed before the next time the emp variable is used. The code for a method that looks up and returns the Employee with a given id is now trivial and shown in Listing 2-4. Listing 2-4. Method for Finding an Employee public Employee findEmployee(int id) { return em.find(Employee.class, id); } In the case where no employee exists for the id that is passed in, then the method will return null because that is what find() will return.

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