 17 | 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 |
17 | When I run the following code:
EntityManager em = getEm();
Customer result = null;
try {
logger.debug("Ident: "+ident);
result = em.createQuery("Select c from Customer c where c.identifier=:id", Customer.class).setParameter("id", ident).getSingleResult();
} catch (javax.persistence |
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 | : Select File > Import... > Maven > Existing Maven Projects and click Next. Select the points-console directory as Root Directory and press ENTER. Select the project and click Finish. Run the project in Eclipse: Right click the project node and select Run As > Java Application. Select Main - point and click OK. |
16 | identification variables and SELECT result variables. Parameters - when instances of these classes are assigned ... through a NULL value The following query retrieves country names with their capital city names:
SELECT ... of all the entity objects in the database, excluding Country entity objects:
SELECT COUNT(e) FROM |
16 | Eclipse IDE for Java EE Developers environment: Open the [Install] dialog box by selecting Help ... Neon, Oxygen) and press ENTER. Click the Select All button to select all the BIRT features. Complete ... To install the ObjectDB data source driver for BIRT: Open the [Install] dialog box by selecting Help |
14 | an alternative way for deleting entity objects. Unlike SELECT queries, which are used to retrieve data from ... returns the number of objects that have been deleted by the query. Selective Deletion The structure of DELETE queries is very simple relative to the structure of SELECT queries. DELETE queries |
14 | : Select File > Open Project.... Select the points-console directory and click Open Project. Run the project in IntelliJ IDEA: Select Run > Run Main Project... (or F6). Click Select Main Class. |
