 17 | has around 30.000 rows) Example query looks like :
String strSelect = "SELECT e FROM TestEntity |
16 | Class fields selection to store |
16 | Selective merge/cascade of detatched entity |
16 | : NONE - cache is disabled. ENABLE_SELECTIVE - cache is disabled except for selected entity classes (see below). DISABLE_SELECTIVE - cache is enabled except for selected entity classes ... Cache Settings The ENABLE_SELECTIVE mode indicates that the cache is disabled for all the entity |
16 | extension. To install it: Open the [Install] dialog box by selecting Help > Install New Software... In ... ENTER. Select the ObjectDB Birt/ODA feature. Complete the installation by clicking Next twice, accepting ... and selecting New Data Source. Select ObjectDB Data Source from the list of available data source types |
16 | ="SELECT c FROM Country c")
The @NamedQuery annotation contains four elements ... class. But since the scope of named queries is the entire persistence unit, names should be selected ... ", query="SELECT c FROM Country c")
public class Country {
...
} Attaching multiple named |
16 | as a server in your NetBeans - you should be able to run your application now by selecting Run > Run Main Project from the main menu (or F6): You can select the server in the Run category of the project properties window (right click the project node and select Properties to open it). Alternatively |
16 | objects in the database by using a simple query: Query q1 = em.createQuery("SELECT COUNT(p) FROM Point p");
System.out.println("Total Points: " + q1.getSingleResult());
The query string ("SELECT ... of a query that returns a single result: Query q2 = em.createQuery("SELECT AVG(p.x) FROM Point p |
16 | objects in the database by using a simple query: Query q1 = em.createQuery("SELECT COUNT(p) FROM Point p");
System.out.println("Total Points: " + q1.getSingleResult());
The query string ("SELECT ... of a query that returns a single result: Query q2 = em.createQuery("SELECT AVG(p.x) FROM Point p |
16 | The Query interface defines two methods for running SELECT queries: Query.getSingleResult - for use ... query =
em.createQuery("SELECT c FROM Country c", Country.class);
ListSELECT c FROM Country c");
List results = query |