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| author | Sven Eisenhauer <sven@sven-eisenhauer.net> | 2023-11-10 15:11:48 +0100 |
|---|---|---|
| committer | Sven Eisenhauer <sven@sven-eisenhauer.net> | 2023-11-10 15:11:48 +0100 |
| commit | 33613a85afc4b1481367fbe92a17ee59c240250b (patch) | |
| tree | 670b842326116b376b505ec2263878912fca97e2 /Master/Reference Architectures and Patterns/hjp5/examples/Listing4507.java | |
| download | Studium-master.tar.gz Studium-master.tar.bz2 | |
Diffstat (limited to 'Master/Reference Architectures and Patterns/hjp5/examples/Listing4507.java')
| -rw-r--r-- | Master/Reference Architectures and Patterns/hjp5/examples/Listing4507.java | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/Master/Reference Architectures and Patterns/hjp5/examples/Listing4507.java b/Master/Reference Architectures and Patterns/hjp5/examples/Listing4507.java new file mode 100644 index 0000000..f5d150a --- /dev/null +++ b/Master/Reference Architectures and Patterns/hjp5/examples/Listing4507.java @@ -0,0 +1,31 @@ +/* Listing4507.java */
+
+import javax.persistence.*;
+
+public class Listing4507
+{
+ public static void main(String[] args)
+ {
+ //Erzeugen einer EntityManagerFactory mit Hilfe des symbolischen
+ //Namens aus dem Persistenz Descriptor (persistence.xml)
+ EntityManagerFactory emf =
+ Persistence.createEntityManagerFactory("persistenceExample");
+
+ //Erzeugen eines EntityManagers für den Zugriff auf
+ //die Datenbank
+ EntityManager manager = emf.createEntityManager();
+
+ //Laden des Directory-Objektes mit der Id=0
+ Directory dir = manager.find(Directory.class, 0);
+
+ //Ausgabe des gefundenen Objektes
+ System.out.println(dir);
+
+ //Freigabe der Ressourcen des EntityManagers
+ manager.close();
+
+ //Schließen der EntityManagerFactory und Freigeben der
+ //belegten Ressourcen
+ emf.close();
+ }
+}
\ No newline at end of file |