Michael Ebner's Delphi 6 Datenbankprogrammierung PDF

By Michael Ebner

ISBN-10: 3827311373

ISBN-13: 9783827311375

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Wird aber ein und derselbe Bezeichner in mehreren Tabellen als Spaltenname verwendet, dann ist das Verhalten der einzelnen SQL-Systeme unterschiedlich. Bei manchen Systemen ist es zufällig, welche Spalte verwendet wird, andere wiederum verwenden die zuerst genannte Tabelle, bisweilen wird eine Fehlermeldung ausgegeben. Um hier potenzielle Fehler auszuschließen, sollten Sie grundsätzlich Tabellen-Bezeichner (oder -Aliase) voranstellen. Es gibt zwei Mitarbeiter mit dem Namen Müller. Selbst wenn dem nicht so wäre, müsste man stets damit rechnen, dass durch eine Neueinstellung ein Name öfters vorkommt.

Würde man den Pfad zu diesem Verzeichnis im Programm hart kodieren, dann müsste bei allen Rechnern, die dieses Programm verwenden, die Datenbank denselben Pfad haben. Würde die Datenbank in einem anderen Verzeichnis installiert oder dorthin verschoben, dann würde das Programm nicht mehr laufen. Um das zu vermeiden, weist man jeder Datenbank einen Namen, einen so genannten Alias zu. In der BDE-Verwaltung (oder im Datenbank-Explorer) findet man nun eine Liste der vergebenen Aliase sowie die dazugehörenden Pfade.

Es darf also nicht vorkommen, dass in der Tabelle Rechnungen ein Kunde 2345 angegeben ist, der in der Tabelle Kunden nicht existiert. Dazu sind zwei Sicherheitsmechanismen erforderlich: ■ Wird in die Tabelle Rechnungen ein neuer Datensatz eingefügt (oder ein bestehender geändert), dann muss sichergestellt werden, dass für den Wert in Kunde ein Datensatz in Kunden vorhanden ist. ■ Wird in der Tabelle Kunden ein Datensatz gelöscht (oder entsprechend geändert), dann muss das RDBMS prüfen, ob es in der Tabelle Rechnungen in der Spalte Kunde Einträge gibt, welche auf diesen Datensatz verweisen.

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Delphi 6 Datenbankprogrammierung by Michael Ebner

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