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A trigger is a named PL/SQL block stored in the Oracle Database and executed automatically when a triggering event takes place. The event can be any of the following: A data manipulation language (DML) statement executed against a table e.g., INSERT , UPDATE , or DELETE .
The source code for this book is available to readers at http://www.apress.com in the Downloads section. You will need to answer questions pertaining to this book in order to suc-cessfully download the code. Contents at a Glance. Foreword to the OakTable Press Series . . . . . . . . . . . . . . . . . . . . . . . . . . . .ix.
For example, database triggers (code that is attached to tables discussed in Chapter 13, “Trig-gers,” and Chapter 14, “Mutating Tables and Compound Triggers”) on the server side and the logic behind an Oracle form on the client side can be written using PL/SQL.
10 cze 2023 · A trigger is a piece of PL/SQL code on your database that runs when certain events happen. It’s like a stored procedure, but you can’t explicitly call the trigger. It can only run when the event that the trigger is linked to is run. Triggers can be enabled and disabled.
Using Triggers. when something happens. Traditionally, triggers supported the execution of a PL/SQL block when an INSERT, UPDATE, or DELETE occurred on a table or view. Starting with Oracle8i, triggers support system and other data events on DATABASE and SCHEMA.
A trigger can be a stored PL/SQL or C procedure associated with a table, view, schema, or the database itself. Oracle Database XE automatically executes a trigger when a specified event takes place, which usually is a DML statement being issued against the table. The types of triggers are: DML triggers on tables.
Triggers in Oracle - Free download as Word Doc (.doc), PDF File (.pdf), Text File (.txt) or read online for free. Triggers are PL/SQL blocks that are automatically executed in response to events like data manipulation language (DML) statements on a database table.
