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Generators

A generator is a sequential number that can be automatically inserted in a column with the GEN_ID() function. A generator is often used to ensure a unique value in a PRIMARY KEY, such as an invoice number, that must uniquely identify the associated row. In Firebird 2.0 and higher SEQUENCE has been introduced as a synonym for GENERATOR, in accordance with SQL-99.

Creating Generators

       

New generators are created within Create Generator Wizard. In order to run the wizard you should either

 

•select the Object | Create Database Object... main menu item;
•select the Generator icon in the Create Database Object dialog

or

•select the Generators list or any object from that list in the explorer tree;
•select the Create New Generator... item from the popup menu

or

•open the database in Database Editor and the Generators tab there;
•press the Insert key or select the Create New Generator... item from the popup menu (alternatively, you may use the corresponding link of the Navigation Bar).

       

To create a new generator with the same properties as one of the existing generators has:

 

•select the Object | Duplicate Database Object... main menu item;
•follow the instructions of Duplicate Object Wizard.

 

 

Editing Generators

       

Generators can be edited within Generator Editor. In order to run the editor you should either

 

•select the generator for editing in the explorer tree (type the first letters of the generator name for quick search);
•select the Edit Generator ... item from the popup menu

or

•open the database in Database Editor and the Generators tab there;
•select the generator to edit;
•press the Enter key or select the Edit Generator item from the popup menu (alternatively, you may use the corresponding link of the Navigation Bar).

 

 

Dropping Generators

       

To drop a generator:

 

•select the generator to drop in the explorer tree;
•select the Drop Generator item from the popup menu

or

•open the database in Database Editor and the Generators tab there;
•select the generator to drop;
•press the Delete key or select the Drop Generator 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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