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Manual
12

Query Parameters in JPA

Query parameters enable the definition of reusable queries. Such queries can be executed with different parameter values to retrieve different results. Running the same query multiple times ... ) The following method retrieves a Country object from the database by its name: public Country
Manual
12

Running JPA Queries

(with getResultList) The following query retrieves all the Country objects in the database. Because multiple ... printing the country names, a query that uses projection and retrieves country names directly instead
Manual
12

Setting and Tuning of JPA Queries

for the first page), the following expression retrieves the results for a specified page: Listretrieves. For example, the following query
Tutorial
12

Step 3: Define a Spring DAO Component

); } // Retrieves all the guests: public List getAllGuests() { TypedQuery query ... - for storing a new Guest entity object in the database. getAllGuests - for retrieving all the existing
Tutorial
12

Step 3: Define a Spring DAO Component

public void persist(Guest guest) { em.persist(guest); } // Retrieves ...  Guest entity object in the database. getAllGuests - for retrieving all the existing Guest objects
Tutorial
12

Step 3: Define an EJB Session Bean

); } // Retrieves all the guests: public List getAllGuests ... - for retrieving all the existing Guest objects from the database. EJB classes are only supported by Java EE
Tutorial
12

Step 3: Define an EJB Session Bean

) { em.persist(guest); } // Retrieves all the guests: public Listretrieving all the existing Guest objects from the database. EJB classes
Tutorial
12

Step 4: Add a Servlet Class

is retrieved from the application scope attribute, and then an EntityManager (representing a database ... entity objects are retrieved from the database and stored in the request's "guest" attribute
Tutorial
12

Step 4: Add a Servlet Class

operations on every http request: The EntityManagerFactory is retrieved from the application scope attribute ... is constructed and stored in the database. All the Guest entity objects are retrieved from
Manual
12

Updating JPA Entity Objects

Once an entity object is retrieved from the database (no matter which way) it can simply be modified in memory ... when it is retrieved from the database and to compare that snapshot to the actual managed object