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Posted by / 30-Jun-2017 18:47

Oracle trigger if inserting or updating

After triggers can write data into tables and unlike some SQLite only supports row-level triggers, not statement-level triggers.

Updateable views, which are not supported in SQLite, can be emulated with INSTEAD OF triggers.

If there are more triggers for same operation on table then firing order is determined by trigger creation data.

Since version 9.7 IBM DB2 supports autonomous transactions.

Recently we learnt how to audit a table using DML Triggers in Oracle database now we will see how we can make a synchronized backup copy of a table using the same.

By synchronized backup copy I mean the backup table gets automatically populated or updated with the main table simultaneously.

Database-level triggers can help enforce multi-table constraints, or emulate materialized views.

If an exception is raised in a TRANSACTION COMMIT trigger, the changes made by the trigger so far are rolled back and the client application is notified, but the transaction remains active as if COMMIT had never been requested; the client application can continue to make changes and re-request COMMIT.

Statement level triggers will be called once regardless of how many rows are affected by the UPDATE.

Suppose you have a trigger that is made to be called on an UPDATE to a certain table.

Row level triggers would execute once for each row that is affected by the UPDATE.

These trigger types are referred to as "Schema-level triggers". Performing conditional actions in triggers (or testing data following modification) is done through accessing the temporary Inserted and Deleted tables. The following functionality in SQL:2003 was previously not implemented in Postgre SQL: Firebird supports multiple row-level, BEFORE or AFTER, INSERT, UPDATE, DELETE (or any combination of thereof) triggers per table, where they are always "in addition to" the default table changes, and the order of the triggers relative to each other can be specified where it would otherwise be ambiguous (POSITION clause.) Triggers may also exist on views, where they are always "instead of" triggers, replacing the default updatable view logic.

(Before version 2.1, triggers on views deemed updatable would run in addition to the default logic.) Firebird does not raise mutating table exceptions (like Oracle), and triggers will by default both nest and recurse as required (SQL Server allows nesting but not recursion, by default.) Firebird's triggers use NEW and OLD context variables (not Inserted and Deleted tables,) and provide UPDATING, INSERTING, and DELETING flags to indicate the current usage of the trigger.

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