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- Reformat source so it's wrapped. - Standardise markup. - Center images. - Restructure in various places to improve the indexing. - Remove duplicated Query Tool toolbar descriptions. - Ensure the structure works in both HTML and LaTeX.
94 lines
3.6 KiB
ReStructuredText
94 lines
3.6 KiB
ReStructuredText
.. _event_trigger_dialog:
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*****************************
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`Event Trigger Dialog`:index:
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*****************************
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Use the *Domain Trigger* dialog to define an event trigger. Unlike regular
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triggers, which are attached to a single table and capture only DML events,
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event triggers are global to a particular database and are capable of capturing
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DDL events. Like regular triggers, event triggers can be written in any
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procedural language that includes event trigger support, or in C, but not in
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SQL.
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The *Domain Trigger* dialog organizes the development of a event trigger through
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the following dialog tabs: *General*, *Definition*, and *Security Labels*. The
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*SQL* tab displays the SQL code generated by dialog selections.
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.. image:: images/event_trigger_general.png
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:alt: Event trigger dialog general tab
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:align: center
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Use the fields in the *General* tab to identify the event trigger:
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* Use the *Name* field to add a descriptive name for the event trigger. The name
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will be displayed in the *pgAdmin* tree control.
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* Use the drop-down listbox next to *Owner* to specify the owner of the event
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trigger.
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* Store notes about the event trigger in the *Comment* field.
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Click the *Definition* tab to continue.
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.. image:: images/event_trigger_definition.png
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:alt: Event trigger dialog definition tab
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:align: center
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Use the fields in the *Definition* tab to define the event trigger:
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* Select a radio button in the *Enabled Status* field to specify a status for
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the trigger: *Enable* *Disable*, *Replica* *Always*.
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* Use the drop-down listbox next to *Trigger function* to specify an existing
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function. A trigger function takes an empty argument list, and returns a
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value of type event_trigger.
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* Select a radio button in the *Events* field to specify when the event trigger
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will fire: *DDL COMMAND START*, *DDL COMMAND END*, or *SQL DROP*.
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* Use the *When* field to write a condition for the event trigger that must be
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satisfied before the event trigger can execute.
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Click the *Security Labels* tab to continue.
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.. image:: images/event_trigger_security.png
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:alt: Event trigger dialog security tab
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:align: center
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Use the *Security* tab to define security labels applied to the trigger. Click
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the *Add* icon (+) to add each security label.
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* Specify a security label provider in the *Provider* field. The named provider
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must be loaded and must consent to the proposed labeling operation.
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* Specify a security label in the *Security Label* field. The meaning of a given
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label is at the discretion of the label provider. PostgreSQL places no
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restrictions on whether or how a label provider must interpret security
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labels; it merely provides a mechanism for storing them.
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Click the *Add* icon (+) to assign additional security labels; to discard a
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security label, click the trash icon to the left of the row and confirm deletion
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in the *Delete Row* popup.
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Click the *SQL* tab to continue.
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Your entries in the *Domain Trigger* dialog generate a generate a SQL command.
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Use the *SQL* tab for review; revisit or switch tabs to make any changes to the
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SQL command.
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Example
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*******
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The following is an example of the sql command generated by user selections in
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the *Domain Trigger* dialog:
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.. image:: images/event_trigger_sql.png
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:alt: Event trigger dialog sql tab
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:align: center
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The command creates an event trigger named *accounts* that invokes the procedure
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named *acct_due*.
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* Click the *Info* button (i) to access online help.
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* Click the *Save* button to save work.
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* Click the *Cancel* button to exit without saving work.
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* Click the *Reset* button to restore configuration parameters.
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