Trigger updating

14-Apr-2019 21:45

As you can see in the current code 0.10 doesn't even try to provide an immutable api for entities.

The same method in 0.11-alpha handles this as one would expect.

If you use a condition in the clause, the trigger is executed for all rows.

Notice that if you drop a table, all associated triggers are also deleted.

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 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.

The trigger is mostly used for maintaining the integrity of the information on the database.Summary: this tutorial discusses SQLite trigger, which is a database object fired implicitly when data in a table is changed.An SQLite trigger is a named database object that is executed automatically when an INSERT, UPDATE, or DELETE statement is issued against the associated table.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.

The trigger is mostly used for maintaining the integrity of the information on the database.

Summary: this tutorial discusses SQLite trigger, which is a database object fired implicitly when data in a table is changed.

An SQLite trigger is a named database object that is executed automatically when an INSERT, UPDATE, or DELETE statement is issued against the associated table.

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.

You can verify the data triggers the background change by editing the initial raw Data and verify that the content State is updating with the "Log State" button.