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jpa21-mapping-inheritance's Introduction

Example JPA Mapping inheritance

Anforderungen

  • Oracle JDK 1.8
  • NetBeans IDE 8 (https://netbeans.org/)
  • Derby DB (in NetBeans enthalten)
  • Maven 3 (in NetBeans enthalten)

Vorbereitung

  • JRE installieren
  • NetBeans installieren
  • in NetBeans unter "Services" eine neue JavaDB Datenbank anlegen
    • Name: ExampleJpaMappingInheritance
    • User: example
    • Pass: example

Beispiel Anforderung

  • Es existieren 2 Ausprägungen eines Vertrages. Den Kartenvertrag und den PFMobilevertrag
  • Es soll möglich sein alle Verträge zu suchen
  • Es soll möglich sein nur Kartenverträge zu suchen
  • Es soll möglich sein nur PFMobileverträge zu suchen

Datenmodell

Tabelle "VERTRAG"

  • INTEGER ID
  • INTEGER VERTAGART

Tabelle "KARTENVERTRAG"

  • INTEGER ID
  • INTEGER KARTEID
  • INTEGER KONTONR

Tabelle "PFMOBILEVERTRAG"

  • INTEGER ID
  • VARCHAR HANDYNR

Objektmodell

abstract class Vertrag { Long id; Integer vertragart; }

class KartenVertrag extends Vertrag { Integer karteId; Integer kontoNr; }

class PFMobileVertrag extends Vertrag { Integer handyNr; }

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