Oracle Application Express

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Oracle Application Express
Oracle Corporation Logo
Developer(s) Oracle Corporation
Stable release 4.2.6 / September 24, 2014 (2014-09-24)
Operating system Linux and Windows
Type Oracle database development environment
License Oracle Technical Network License (Proprietary)
Website http://apex.oracle.com

Oracle Application Express (abbreviated APEX, previously named Oracle HTML DB) is a web-based software development environment that runs on an Oracle database. APEX comes as standard (at no additional cost) with all Oracle Database editions and, starting with Oracle 11g, is installed by default as part of the core database install.

APEX can be used to build complex web applications which can be used in most modern web browsers. The APEX development environment is also browser-based.

Releases[edit]

Oracle Application Express can be installed on any Oracle database from version 9.2 or higher, and starting from Oracle 11g it is installed with the database by default. APEX 4.0 and higher can be installed on an Oracle 10.2.0.3 or higher database. APEX 5.0 is currently available to preview on the Oracle website, but a public release date has not yet been announced.[1]

Product Name Version Released Notes
HTML DB 1.5 2004 First release [2]
HTML DB 1.6 2004 Added themes [2]
HTML DB 2.0 2005 Added SQL Workshop [2]
Application Express 2.1 January 2006 HTMLDB was renamed to APEX. Version 2.1 of APEX was bundled with the free Oracle Express Edition (XE) database.
Application Express 2.2 2006 Packaged Applications [2]
Application Express 3.0 2007 This version featured several new features, including PDF Printing, Flash charting and Access Application Migration [2]
Application Express 3.0.1 July 2007 This version could also be installed into an Oracle XE database.
Application Express 3.1 Spring 2008 This included a new major feature known as Interactive Reporting (enabled end-users to customize a report without programmer intervention, using techniques such as filtering, sorting, group-by, choosing displayed columns, etc. The user can even save multiple versions of their customized reports. The programmer can limit which features are enabled). Also added support for BLOB data type [2]
Application Express 3.2 2009 Forms conversion [2]
Application Express 4.0 June 2010 Some notable features are declarative Dynamic Actions (which allow reacting to changes on a page without the developer having to write custom Javascript) and Plugins (which allow developers to create custom components such as items, regions and processes, that can be re-used across pages and applications). Also added Websheets and RESTful Web[2]
Application Express 4.1 August 2011 Notable new features included improved (customized) error handling, use of ROWID for updates, a data upload feature for end-users, and improved WebSheets (a hybrid of a spreadsheet and a Wiki, built using Apex itself).
Application Express 4.1.1 February 2012 Notable new features included new theme (cloudy) and various templates.
Application Express 4.2 October 2012 Notable new features such as application builder for mobile, mobile and responsive themes, and HTML5 support.
Application Express 4.2.1 December 2012 Bug Fixes.
Application Express 4.2.2 April 2013 Bug Fixes, Improved PDF printing, new Survey Builder packaged application
Application Express 4.2.3 September 2013 This is a cumulative patch set for Application Express 4.2.0, Application Express 4.2.1, and Application Express 4.2.2
Application Express 4.2.4 December 2013 This is a cumulative patch set for Application Express 4.2.0, Application Express 4.2.1, Application Express 4.2.2 and Application Express 4.2.3
Application Express 4.2.5 April 2014 This is a cumulative patch set for Application Express 4.2.0, Application Express 4.2.1, Application Express 4.2.2, Application Express 4.2.3 and Application Express 4.2.4
Application Express 4.2.6 September 2014 This is a cumulative patch set for Application Express 4.2.0, Application Express 4.2.1, Application Express 4.2.2, Application Express 4.2.3, Application Express 4.2.4 and Application Express 4.2.5

Background[edit]

Application Express has gone through many name changes since its inception in 2000. Names include:

  • Flows
  • Oracle Platform
  • Project Marvel
  • HTML DB
  • Application Express (APEX)

APEX was created by Mike Hichwa, a developer at Oracle, after development of his previous project, Web DB, started to diverge from his original vision. Although APEX shares some functionality with Web DB, it was developed from scratch and there's no upgrade path from Web DB to APEX. When tasked with building an internal web calendar, Hichwa enlisted the help of Joel Kallman and started development on a project called Flows. Hichwa and Kallman co-developed the Web Calendar and Flows, adding features to Flows as they needed them to develop the calendar. Early builds of Flow had no front-end so all changes to an application had to be made in SQL*Plus via inserts, updates and deletes.[3]

APEX is used internally by Oracle to develop some of its support sites. The AskTom knowledgebase and online store both run on APEX. The Metalink support site ran on APEX for some time before it was eventually replaced by a Oracle ADF solution.[4]

Advantages[edit]

  • DBAs familiar with PL/SQL can use their skill set to develop web applications
  • Easy to create mock-ups using pre-built themes
  • Easy to deploy (end user opens a URL to access an APEX application)
  • Scalable (can be deployed to laptops, stand-alone servers, or Oracle RAC installations)
  • Server-side processing and validations
  • Strong and supportive user community (especially Oracle APEX forum)
  • Basic support for group development
  • Free hosting of demo applications provided by Oracle
  • Apex applications can run on the free Oracle Express Edition (XE) database
  • Individual components of an application can be retrieved or identified using SQL, facilitating customized reports
  • Easily adheres to the SQA development/test/production model (while not exposing DB passwords)
  • Helps put the focus on the DB model supporting a solution (verses coding in Java, .NET or PHP - you only need JavaScript)
  • Easily supports a standardized theme across application sets (and the changing of that theme)
  • Semi-technical end users can build their own web pages and reports

Disadvantages[edit]

  • Large installation size. The unzipped installation files for Apex 4.1 that includes 9 different languages for the "Application Builder" interface is 747 megabytes. The English-only version is 147 megabytes. Apex is installed on the database server; developers and users only need a web browser to build and use applications.
  • Primary keys can be at most two separate fields. However since version 4.1 Application Express supports the use of ROWID for updates, inserts and deletes as an alternative to specifying primary keys. Prior to version 4.1 APEX assumed by default that all tables would use generated keys such as from sequences or triggers, therefore, if a table had more than two key columns then the default DML processes could not be used.
  • Pages in APEX can display at most 200 items and forms cannot handle more than 200 database items. Compare this to the Oracle Database where tables can have up to 1000 columns. Pages must be designed to work around this limitation, for example by using multiple pages, tabular forms, or Ajax for on-demand updates.
  • APEX applications are created using Oracle's own tools and only can be hosted in an Oracle database, making an implementer susceptible to vendor lock-in.
  • Very few webhosts offer APEX (Oracle Database) on their hosting service package (most of them offer PHP + MySQL or ASP + Microsoft SQL Server). As a result, APEX applications are limited in their choice of webhosts.
  • Projects requiring multiple developers to touch the same web page will need to communicate their intentions with each other. There is no built in version control and all components must be edited through the web interface. Page locking can help guard against physical dependencies.

Security[edit]

There is a common misconception that the abstracted nature of APEX applications results in a relatively secure user environment. However, APEX applications suffer from the same classes of application security flaws as other web applications based on more direct technologies such as PHP, ASP.net and Java.

The main classes of vulnerability that affect APEX applications are: SQL injection, Cross-site scripting (XSS), and Access Control.

APEX applications inherently use PL/SQL constructs as the base server-side language. As well as accessing data via PL/SQL blocks, an APEX application will use PL/SQL to implement authorization, and to conditionally display web page elements. This means that generally APEX applications suffer from SQL injection when these PL/SQL blocks do not correctly validate and handle malicious user input. Oracle implemented a special variable type for APEX called Substitution Variables (with a syntax of &NAME.) and these are not safe and lead to SQL Injection. Where the injection occurs within a PL/SQL block an attacker can inject an arbitrary number of queries or statements to execute. Escaping special characters and using bind variables is the right way to code to ensure no XSS and SQL injection.

Cross-Site Scripting vulnerabilities arise in APEX applications just like other web application languages. Oracle provide the htf.escape_sc() function to escape user data that is displayed within a rendered HTML response. The reports that APEX generates also provide protection against XSS through the Display As setting on report columns. Originally the default was for reports to be created without any escaping of the columns, although recent versions now set the column type to escape by default. Column definitions can be queried programmatically to check for columns that do not escape the value.

To control access to resources within an APEX application a developer can assign authorization schemes to resources (such as pages and items). These must be applied consistently in order to ensure that resources are appropriately protected. A typical example of inconsistent access-control being applied is where an authorization scheme is set for a Button item, but not the associated Process that is performed when the button is clicked. A malicious user can perform the process (through JavaScript) without requiring the actual Button to be accessible.

Since APEX 4.0, the Application Builder interface provides some limited assessment of the security posture through the Advisor utility.

Same in Above Details.

APEX and Oracle Database Express Edition (XE)[edit]

Oracle Application Express can be run inside Oracle Database Express Edition (XE), a free entry-level database. Although the functionality of APEX isn't intentionally limited when running on XE, the limitations of the database engine may prevent some APEX features from functioning. Also, Oracle XE has limits for CPU, memory and disk usage.[5]

See also[edit]

References[edit]

  1. ^ "Application Express 5.0 Early Adopter 2". Application Express 5.0 Early Adopter 2. Oracle. 
  2. ^ a b c d e f g h "APEX Overview". Oracle Corporation. Retrieved 16 September 2012. 
  3. ^ "Michael Hichwa". Apress. "Michael Hichwa is the original developer and architect of Oracle Application Express (APEX), aka HTML DB. Michael created APEX as a 100% rewrite of an earlier browser-based application development tool he also created, called Oracle WebDB. He had invaluable technical assistance and guidance from Tom Kyte and the addition of Joel Kallman as a co-developer. Michael and Joel have led APEX developments efforts since 1999" 
  4. ^ Introducing My Oracle Support
  5. ^ "Limitations of the Express Edition". Oracle Corporation. Retrieved 22 May 2013. 

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