About SELECT

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Tutorial
13

Step 2: Entity Class and Persistence Unit

the project node (in the [Package Explorer] window), select New > Source Folder, enter src/main/java ... the new source directory node (in the [Package Explorer] window) and selecting New > Class. Enter guest as ... : Right click the src/main/resources node (in the [Project Explorer]) and select New > Folder
Tutorial
13

JPA Web App Tutorial - Eclipse Project

the project zip file: JPA Web Application - Maven Project (6KB). Open the Maven project in Eclipse: Select File > Import... > Maven > Existing Maven Projects and click Next. Select the guestbook-web directory as Root Directory and press ENTER. Select the project and click Finish. Run the project in Eclipse
Manual
13

DELETE Queries in JPA/JPQL

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
Manual
13

Query Parameters in JPA

( "SELECT c FROM Country c WHERE c.name = :name", Country.class); return query.setParameter ... .createQuery( "SELECT c FROM Country c WHERE c.name = ?1", Country.class); return query ... (assuming that meaningful names are selected). Therefore, they are preferred over ordinal parameters
Tutorial
13

Java EE 6 JPA Tutorial - Eclipse Project

: Select File > Import... > Maven > Existing Maven Projects and click Next. Select the guestbook-jee6 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 > Run On Server. (this command is available
Tutorial
13

Step 3: Add a Main Class

clicking the tutorial package node (in the [Package Explorer] window) and selecting New > Class ... (); // Find the number of Point objects in the database: Query q1 = em.createQuery("SELECT COUNT(p ... ()); // Find the average X value: Query q2 = em.createQuery("SELECT AVG(p.x) FROM Point p
Tutorial
13

Step 2: Entity Class and Persistence Unit

) and selecting New > Class. Enter guest as the package name - use exactly that case sensitive package ... the [Project Explorer] window) and selecting New > Folder (or New > Other... > General > Folder and clicking Next). Select the project src folder as a parent folder, enter META-INF as a new folder
Tutorial
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Step 1: Create a Java EE 6 Web Project

] dialog box, e.g. by using File > New Project... Select Java Web > Web Application and click Next. Choose a Project Name (e.g. Guestbook) and click Next. Select GlassFish Server 3 (or above) and Java EE ... ] window and select Add Jar/Folder... Select the objectdb.jar file from the bin subdirectory
Tutorial
13

Getting Started with JPA - IntelliJ Project

: 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.
JPA Doc
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javax.persistence.criteria.CriteriaQuery

roots Since: JPA 2.0 Selection getSelection() Return the selection of the query, or null if no selection has been set. Return the selection of the query, or null if no selection has been set. Returns: selection item Since: JPA 2.0 AbstractQuery groupBy(List> grouping) Specify