Copyright Ó Oracle Corporation, 1999. All rights reserved. 2222 Sharing Objects and Code.

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Sharing Objects and CodeSharing Objects and Code

ObjectivesObjectives

After completing this lesson, you should be able to do the following:

• Describe the various methods for reusing objects and code

• Inherit properties from property classes

• Group related objects for reuse

• Reuse objects from an object library

• Reuse PL/SQL code

After completing this lesson, you should be able to do the following:

• Describe the various methods for reusing objects and code

• Inherit properties from property classes

• Group related objects for reuse

• Reuse objects from an object library

• Reuse PL/SQL code

Sharing and Reusing CodeSharing and Reusing Code

• Increases productivity

• Decreases maintenance

• Increases modularity

• Maintains standards

• Increases productivity

• Decreases maintenance

• Increases modularity

• Maintains standards

Property ClassesProperty Classes

properties

Canvas

properties

Relation

properties

Property Class IconsProperty Class Icons

Add PropertyAdd Property Inherit PropertyInherit Property

Property ClassProperty ClassDelete PropertyDelete Property

Property palette

Default property

Inherited and Variant PropertiesInherited and Variant Properties

Default property

Property palette

Default property

Changed propertyChangeChangeDefault property

Property class

Property palette

Inherited property

Property palette

Inherited property

Variant property

ChangeChange

Inherited propertyInheritInherit

Inherited property

Inheriting PropertiesInheriting Properties

• Set the Subclass Information property.

• Convert an inherited property to a variant property.

• Convert a variant property to an inherited property.

• Set the Subclass Information property.

• Convert an inherited property to a variant property.

• Convert a variant property to an inherited property.

Object GroupObject Group

• Is a logical container

• Enables you to:

– Group related objects

– Copy multiple objects in one operation

• Is a logical container

• Enables you to:

– Group related objects

– Copy multiple objects in one operation

Using Object GroupsUsing Object Groups

• Blocks include:

– Items

– Item-level triggers

– Block-level triggers

– Relations

• Object groups cannot include other object groups

• Deleting:

– An object group does not affect the objects

– An object affects the object group

• Blocks include:

– Items

– Item-level triggers

– Block-level triggers

– Relations

• Object groups cannot include other object groups

• Deleting:

– An object group does not affect the objects

– An object affects the object group

Copying ObjectsCopying Objects

Ability to Ability to make exactmake exactcopy of objectcopy of object

Company Name:

Company Code:

Balance:

Company Name:

Company Code:

Balance:

What Is Subclassing?What Is Subclassing?

Ability to add Ability to add to objectto object

Company Name:

Company Code:

Balance:

Company Name:

Company Code:

Balance:

Address:

Company Name:

Company Code:

Balance:

SubclassingSubclassing

Ability to add Ability to add to objectto object

AbilityAbilityto alterto alterpropertiesproperties

Company Name:

Company Code:

Balance:

Company Name:

Company Code:

Balance:

Address:

Company Name:

Company Code:

Balance:

Company Name:

Company Code:

Balance:

Inheriting ChangesInheriting Changes

Company Name:

Company Code:

Balance:

Company Name:

Company Code:

Balance:

Company Name:

Company Code:

Balance:

Company Name:

Company Code:

Balance:

Address:

Make changes to parentMake changes to parent

AbilityAbilityto inheritto inheritchangeschanges

An Object LibraryAn Object Library

• Is a convenient container of objects for reuse

• Simplifies reuse in complex environments

• Supports corporate, project, and personal standards

• Simplifies the sharing of reusable components

• Is a convenient container of objects for reuse

• Simplifies reuse in complex environments

• Supports corporate, project, and personal standards

• Simplifies the sharing of reusable components

Object LibrariesObject Libraries

• Appear in the Navigator if they are open

• Are used with a simple tabbed interface

• Are saved to .olb file or to database

• Appear in the Navigator if they are open

• Are used with a simple tabbed interface

• Are saved to .olb file or to database

Benefits of the Object LibraryBenefits of the Object Library

• Simplifies the sharing and reuse of objects

• Provides control and enforcement of standards

• Eliminates the need to maintain multiple referenced forms

• Simplifies the sharing and reuse of objects

• Provides control and enforcement of standards

• Eliminates the need to maintain multiple referenced forms

A SmartClassA SmartClass

• Is an object in an object

library that is frequently

used as a class

• Can be applied easily and

rapidly to existing objects

• Can be defined in many

object libraries

You can have many

SmartClasses of a given object type.

• Is an object in an object

library that is frequently

used as a class

• Can be applied easily and

rapidly to existing objects

• Can be defined in many

object libraries

You can have many

SmartClasses of a given object type.Check indicates a SmartClass.Check indicates a SmartClass.Check indicates a SmartClass.Check indicates a SmartClass.

Working with SmartClassesWorking with SmartClasses

1. Select an object in theLayout Editor or Navigator.

2. From the pop-up menu,select SmartClasses.

3. Select a class from the list.

1. Select an object in theLayout Editor or Navigator.

2. From the pop-up menu,select SmartClasses.

3. Select a class from the list.

Reusing PL/SQLReusing PL/SQL

• Triggers:

– Copy and paste text

– Copy and paste within a module

– Copy to or subclass from another module

– Move to an object library

• PL/SQL program units:

– Copy to or subclass in another module

– Create a library module

• Triggers:

– Copy to or subclass from another module

• PL/SQL program units:

– Copy to or subclass in another module

– Create a library module

PL/SQL LibrariesPL/SQL Libraries

ApplicationsApplications

Form modulesForm modulesMenu modulesMenu modules

Report modulesReport modulesGraphic modulesGraphic modules

.pll.pll ororDatabaseDatabase

Procedures

Functions

Packages

LibraryLibrary

Writing Code for LibrariesWriting Code for Libraries

• A library is a separate module, holding procedures, functions, and packages.

• Direct references to bind variables are not allowed.

• Use subprogram parameters for passing bind variables.

• Use functions, where appropriate, to return values.

• A library is a separate module, holding procedures, functions, and packages.

• Direct references to bind variables are not allowed.

• Use subprogram parameters for passing bind variables.

• Use functions, where appropriate, to return values.

Creating Library Program UnitsCreating Library Program Units

Attach Library Dialog BoxAttach Library Dialog Box

Calls and SearchesCalls and Searches

procedure ( );

...function...

package.call ( );

procedure ( );

...function...

package.call ( ); •Program Units

•Attached Libraries•Database

CallsCalls

SearchesSearches

SummarySummary

• Reasons to share objects and code:

– Increased productivity

– Increased modularity

– Decreased maintenance

– Maintaining standards

• Reasons to share objects and code:

– Increased productivity

– Increased modularity

– Decreased maintenance

– Maintaining standards

SummarySummary

• Methods of sharing objects and code:

– Using property classes

– Using object groups

– Copying

– Subclassing

– Creating a library module

– Using object libraries

• Methods of sharing objects and code:

– Using property classes

– Using object groups

– Copying

– Subclassing

– Creating a library module

– Using object libraries

Practice 22 OverviewPractice 22 Overview

This practice covers the following topics:

• Creating an object group and using this object group in a new form module

• Using property classes

• Creating an object library and using this object library in a new form module

• Setting and using SmartClasses

This practice covers the following topics:

• Creating an object group and using this object group in a new form module

• Using property classes

• Creating an object library and using this object library in a new form module

• Setting and using SmartClasses

Copyright Ó Oracle Corporation, 1999. All rights reserved. 2222 Sharing Objects and Code.

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