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Triggers

A trigger is a specification that the database should automatically execute a particular function whenever a certain type of operation is performed. A trigger can be defined to execute before or after an INSERT, UPDATE, or DELETE operation, either once per modified row, or once per SQL statement.Triggers are actually supported since MySQL version 5.0.10 If a trigger event occurs, the trigger fires.

 

 

Triggers are created within Create Trigger Wizard. In order to run the wizard you should either

 

open the table in Table Editor and the Triggers tab there;
press the Insert key or select the Add New Trigger... item from the popup menu (alternatively, you may use the corresponding link of the Navigation Bar)

or

select the table in the explorer tree and use the Create New Trigger... popup menu item

or

select the table Triggers node or any trigger within the table in the explorer tree and use the Add New Trigger... popup menu item.

 

 

Triggers are edited within the Trigger Editor dialog window. In order to open the dialog you should either

 

open the table in Table Editor and the Triggers tab there;
press the Enter key or select the Edit Trigger item from the popup menu (alternatively, you may use the corresponding link of the Navigation Bar)

or

select the trigger to edit in the explorer tree and use the Edit Trigger popup menu item.

       

You can change the name of the trigger using the Rename Trigger dialog. To open the dialog you should either

 

select the trigger to rename in the explorer tree;
select the Rename Trigger item from the popup menu

or

open the table in Table Editor and the Triggers tab there;
select the trigger to rename;
select the Rename Trigger item from the popup menu (alternatively, you may use the corresponding link of the Navigation Bar).

 

 

 

To drop the trigger:

 

select the trigger to drop in the explorer tree;
select the Drop Trigger item from the popup menu

or

open the table in Table Editor and the Triggers tab there;
press the Delete key or select the Drop Trigger item from the popup menu (alternatively, you may use the corresponding link of the Navigation Bar)

 

and confirm dropping in the dialog window.

 



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