Moreover, views with ORDER BY clauses cause multiple sorts to be performed whenever someone selects data from the view but in a different order. Never use ordinals a. The same applies to the column list in INSERT statements; never ever assume that the order in which the columns are provided matches the table you are adding data to, even though the data types happen to match, and that the order of both the source and the target will always stay the same.
When you are dealing with more than one table or view , use meaningful aliases. It reduces the amount of typing and it makes reading the query easier on the eyes. The adjective meaningful is there to remind you that x and y are probably not that revealing, and they do no nothing to aid the legibility of your code.
Moreover, when defining column aliases, use AS. Its use is optional but sometimes it can be hard to figure out whether you missed a comma between two column names or whether the alias for one column is supposed to be the name of another. The key word here is meaningful. Trivial comments should not be added as they clutter your code and are immediately obvious to all but the brain-dead. You can add comments to tables, materialized views, columns, operators and index types.
Especially when it comes to constraints that force user data into straitjackets. Constraints are imperative to databases. As they will soon find out after receiving an error message: a blank space will often do the trick.
Before you think about adding TRIM Never rely on implicit data type conversions, and always convince yourself that the data type you think applies, really does apply. The moral: do not assume anything when it comes to data types. Just because something looks like a number does not mean that it is stored as a number.
Format your SQL queries and format them consistently. Better yet, use either a built-in formatter or use an online formatter. It may come as a surprise but the actual format matters, even spaces!
The result set that Oracle fetches for you does not depend on spaces but whether it needs to parse a statement with a single space extra. If the query hashes are the same, which generally means that the query you have submitted is formatted identically as one in memory the system global area SGA to be precise , Oracle can immediately execute it.
If not, Oracle needs to analyse your query first. As said on DBA Oracle , the time Oracle needs to parse a statement is almost negligible, but when many users issue functionally and syntactically identical yet symbolically distinct statements, the small amounts of time can quickly add up. Although there is no general consensus about good formatting rules, you can add line breaks in appropriate places, so you are able to comment or uncomment lines without having to manually reformat your code every time.
You should avoid using the following features in your forms, as they are not applicable in this architecture:. Timers other than one-millisecond timers one-millisecond timers are treated as timers that fire immediately. It would open a file on the applications server, rather than on the client machine where the browser is as a user might expect. These would take place on the applications server, rather than on the client machine where the browser is as a user might expect.
These coding standards assume that you are developing code in the appropriate Oracle E-Business Suite development environment, which includes compatible versions of several products.
Running such forms requires additional Oracle Application Object Library user exits referred to by the libraries, as well as settings and runtime code that can only be seen when running forms through a browser. Both the libraries and the user exits also assume a full installation of the Oracle Application Object Library database schema, as they reference tables, views, and packages contained therein.
The following table contains the required parameters and their required values:. You must ensure that the character set you specify is the character set being used for your Oracle E-Business Suite installation. You must also set the value of your Forms path environment variable in your environment file or platform equivalent such as Windows NT registry to include any directory that contains forms, files, or libraries you use to develop and generate your forms.
Oracle Forms Developer allows referenced objects to be overridden in the local form. Oracle Forms Developer also does not normally provide any indication that an object is referenced unless you set a special environment variable Registry setting for NT. This setting allows you to see the reference markers little flags with an "R" in them on referenced objects so you can avoid changing referenced objects unintentionally. Warning: Oracle Forms Developer allows referenced objects to be overridden in the local form.
The characteristics of most form objects, including modules, windows, canvases, blocks, regions, and items may be set in the following ways:. Inherited through property classes, which cause certain properties to be identical in all forms such as canvas visual attributes.
These standards rely extensively on the object referencing capabilities of Oracle Forms. These capabilities allow objects to be reused across multiple forms, with changes to the master instance automatically inherited by forms that share the object. Additionally, these shared objects provide flexibility for cross-platform support, allowing Oracle E-Business Suite to adhere to the look and feel conventions of the platform they run on.
A property class exists for almost every item and situation needed for development. This group also contains other items which are required in all forms but are not necessarily part of the Toolbar.
This object group is copied into each form, rather than referenced, so that it can be modified. You should never modify this file, nor should you create your own menu for your forms. It also has various other utilities for navigation, multicurrency, WHO, etc. These libraries are for Oracle E-Business Suite use only and may not be attached to custom forms. If you code your own library, you will need to attach the necessary libraries to it. Property classes are sets of attributes that can be applied to almost any Oracle Forms object.
Do not override any attribute set by a property class unless this manual explicitly states that it is acceptable, or there is a compelling reason to do so. Overriding an inherited attribute is very rarely required.
For example, the General Ledger application might have specified standard widths and behaviors for "Total" fields throughout the application. Entire items or blocks can also be reused. These files are used for storing application-specific object groups, property classes, and other objects that are referenced into Oracle E-Business Suite forms. An application that integrates with Oracle E-Business Suite consists of many pieces, including but not limited to forms, concurrent programs and reports, database tables and objects, messages, menus, responsibilities, flexfield definitions, online help, and so on.
Building an application also requires that you consider many overall design issues, such as what platforms and languages your application will run on, what other applications you will integrate with, maintenance issues, and so on. When designing your application, you should keep in mind that many Oracle E-Business Suite features affect various facets of your application including database objects, forms, concurrent programs, and so on, and including these features should be considered from the beginning of your application design process.
These features include but are not limited to:. This is the general process of creating an application that integrates with Oracle E-Business Suite.
Register your application using adsplice. Set up your application directory structures. Include your custom application and Oracle schema in the standard data group. Create your application tables and views. See: Tables. See: Views. See: Integrating Custom Objects and Schemas. Register your flexfields tables. Build your application libraries and forms.
See: Overview of Form Development Steps. Build your application functions and menus. See: Overview of Menus and Function Security. Build concurrent programs and reports. See: Overview of Concurrent Processing. This is the general process of building a form that integrates with Oracle E-Business Suite. Create your form blocks, items, LOVs, and other objects and apply appropriate property classes.
See: Setting the Properties of Container Objects. See: Setting the Properties of Widget Objects. Add table handler logic. See: Coding Table Handlers. Code logic for window and alternative region control. See: Controlling Window Behavior. See: Overview of Query Find. Code logic for item relations such as dependent fields. See: Item Relations. Code any messages to use Message Dictionary. See: Overview of Message Dictionary. Add flexfields logic if necessary. See: Overview of Flexfields.
Add choices to the Special menu and add logic to modify the default menu and toolbar behavior if necessary. Register your form with Oracle Application Object Library.
See: Forms Window. Create a form function for your form and register any subfunctions. Add your form function to a menu, or create a custom menu.
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