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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 .
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.
You can use triggers in a number of ways to customize information management in Oracle Database. For example, triggers are commonly used to: Provide sophisticated auditing; Prevent invalid transactions; Enforce referential integrity (either those actions not supported by declarative integrity constraints or across nodes in a distributed database)
This tutorial shows how to use the CREATE TRIGGER statement to create two triggers, HR_LOGON_TRIGGER and HR_LOGOFF_TRIGGER. After someone logs on as user HR, HR_LOGON_TRIGGER adds a row to the table HR_USERS_LOG.
Oracle 11g introduced the concept of compound triggers, which consolidate the code for all the timing points for a table, along with a global declaration section into a single code object. The global declaration section stays in scope for all timing points and is cleaned down when the statement has finished, even if an exception occurs.
Oracle Statement-level Trigger example. We’ll use the table customers from the sample database for the demonstration: Suppose, you want to restrict users from updating the credit of customers from the 28th to the 31st of every month so that you can close the financial month. To enforce this rule, you can use this statement-level trigger:
This Oracle tutorial explains how to create an AFTER INSERT Trigger in Oracle with syntax and examples. Description. An AFTER INSERT Trigger means that Oracle will fire this trigger after the INSERT operation is executed. Syntax. The syntax to create an AFTER INSERT Trigger in Oracle/PLSQL is: CREATE [ OR REPLACE ] TRIGGER trigger_name .
