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A database trigger is like a stored procedure that Oracle Database invokes automatically whenever a specified event occurs. It is a named PL/SQL unit that is stored in the database and can be invoked repeatedly. Unlike a stored procedure, you can enable and disable a trigger, but you cannot explicitly invoke it.
One can use nested stored procedures by executing one stored procedure from within another. Stored procedures may return result sets, i.e., the results of a SELECT statement. Such result sets can be processed using cursors, by other stored procedures, by associating a result-set locator, or by applications. Stored procedures may also contain ...
PL/SQL is available in Oracle Database (since version 7), TimesTen in-memory database (since version 11.2.1), and IBM Db2 (since version 9.7). [11] O-PL/SQL allows the definition of classes and instantiating these as objects, thus creating user-defined datatypes as writing constructors, beyond using Java in stored procedures and triggers.
The following is an Oracle syntax example of a row level trigger that is called AFTER an update FOR EACH ROW affected. This trigger is called on an update to a phone book database. When the trigger is called it adds an entry into a separate table named phone_book_audit.
It is used for executing stored procedures on the database. [11] [12] Both input and output parameters must be passed into the database for stored procedures. [13] Update statements such as INSERT, UPDATE and DELETE return an update count indicating the number of rows affected in the database as an integer. [13]
Stored procedures and user-defined functions; Triggers, procedures which are run automatically based on specific events; Constraints, a constraint on the domain of an attribute; User accounts, schemas and permissions; Database objects are permanent, [3] which means that they remain in their form as long as they are not explicitly changed or ...
Using a database-specific stored procedure that generates the surrogate key, performs the INSERT operation, and finally returns the generated key. For example, in Microsoft SQL Server, the key is retrieved via the SCOPE_IDENTITY() special function, while in SQLite the function is named last_insert_rowid() .
It also contains many PeopleCode-based application scripts and programs that both the application and process scheduler servers execute. As PeopleTools is built to operate on many database platforms, database specific constructs (like stored procedures) and programming languages (like PL/SQL) are not traditionally used. Alternatively ...