Oracle Forms 10g Tutorial For Beginners Pdf Download

These triggers fire within several hours or days after the last event is fired by either a navigational or a form-event trigger. Cascade triggers can not be nested. They can be attached to a Form or to an item. For a form, they are attached to the TOP or BOTTOM forms. They can be attached to, or removed from items by using a CLASS- or INDEX-attached post-action. These triggers can fire only when a navigational event occurs. They fire based on the navigation that generates it, rather than on the result of a query. Developers can use cascade triggers for: 1) As a safety mechanism, to prevent unwanted processing from occurring when the state of the object has changed unexpectedly, 2) To execute database operations like modifying a record (insert, update, delete or lock), based on an action performed by the user, 3) To execute other forms. For a form, they can be attached to the TOP or BOTTOM forms. They can be attached to, or removed from items by using a CLASS- or INDEX-attached post-action. These triggers can fire only when a navigational event occurs. They fire based on the navigation that generates it, rather than on the result of a query.

Control triggers fire in response to changes in the state of a control. These triggers fire when the state of a control changes based on the value of a cell, text item or LOV displayed by the control. A control trigger is attached to a control and fires when the value of the control changes. Controls can be attached to items. They can also be attached to the panel that contains controls, as well as to other controls, forms or items. Controls can belong to one or more Categories. Controls with the same category fire when their state changes. A category is a cluster of similar controls that allow users to selectively display more controls on one form. Users can change their selection among the controls within a category. When the user has selected a value from a control in one category, the value stays selected until another category is selected, and then the previously selected value is deselected.

The designer of Oracle Forms defines the structure of the form in its designer and generates one or more forms at compile time. These forms are then cached in the database and can be executed at runtime by the application. Compiling Forms in 12c Oracle Forms enables you to design a form that executes as a single unit. In earlier releases, creating a form required several steps. The form was compiled into a package which was then cached in the database. At compile time the package returned an image of the form with which you could interact. At runtime the cached package is loaded and the form is executed. Another approach of the past was to design the form on the SQL prompt, save this SQL as a standalone script to the desktop. You’d then load that script into the database, to execute the form. In 12c Oracle Forms compiles each form into an executable package that is cached in the database. The package has a unique name and can be identified on disk. This packaging process enables the form to be executed as a single unit. For example, you can save a package on your desktop, and the form and its supporting objects including their component parts are saved in the package. At runtime, the package is loaded and the form is executed. Saving and running the form does not require the user to load external programs or interact with the desktop. Instead the package is cached in the database, and is executed. It is also possible to share packages from one database to another. For instance, you can share an Oracle Forms package that contains a user interface component between two instances running on different computers. If a package is shared from one database to another, then that package cannot be upgraded. Instead, the package must be upgraded in both databases at the same time.
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