What Is Oracle Apex?
Oracle Application Express is a free Oracle product that allows builders to shortly create web-based purposes on an Oracle database by way of the use of simply a net browser. The APEX device runs in an internet browser and lets in the advent of net functions in a declarative manner, with the aid of virtually choosing pre-built components, configuring them, and bundling them up in a net application, all barring the want to write to a good deal code.
Application Express (otherwise recognized as APEX) is an internet software that is tightly coupled to an Oracle database. It has quite a few uses: you can use its SQL Workshop device to question the database, regulate its contents, or alternate its structure; you can use its Application Builder device to create your internet purposes that engage with the database, and you can run the internet functions created by using you and others.
The utility builder is especially fascinating due to the fact it affords a simple, nontraditional way to construct internet pages. You do no longer specify code for the web page directly; instead, you select from a set of built-in templates. There is a template for the basic web page and templates for every form of thing that you choose to put on the web page (such as reports, buttons, and so on). Each template has a set of properties, whose values decide the place every aspect is positioned on the page, what it appears like, and how it behaves. You create a web page clearly by using deciding on templates for the factors you prefer and assigning values to their properties.
The APEX utility builder saves the property values for every issue in a non-public database. When a browser requests one of your application’s pages, the APEX server extracts the property values applicable to that web page from its database, constructs the HTML code corresponding to these values, and returns that code to the browser. This technique is referred to as rendering the page, and APEX is referred to as an HTML generator.
The gain of the use of an HTML generator such as APEX is that you can construct net pages except for any expertise in HTML (or CSS, JavaScript, or PHP). Moreover, due to the fact APEX is tightly coupled to an Oracle database, it routinely handles the intricacies of database interaction. APEX makes it viable to effortlessly create good-looking, noticeably functional, and database-aware pages with solely rudimentary know-how of SQL.
Also Read: Oracle SQL Training
Do you want to learn how to use Oracle Apex? Then go to Gologica and enroll in “Oracle apex Online Training”. This course will assist you in learning Oracle Apex.
The SQL Workshop
Congratulations! You are on the brink of studying how to construct APEX internet applications. But earlier than you can begin, you want an APEX account. There are various methods to reap an account: you can register for a free account thru the apex.oracle.com net site; you may be given an account to an APEX server at your job, or you can even set up an APEX server yourself and create your account to it.
No depend on the circumstance, your account will have a related URL. When you type the URL into your browser, you’ll be sent to a login page. Below Fig indicates the login display used via the apex.oracle.com server.
Entering your credentials then takes you to the APEX domestic screen, the pinnacle of which is proven in Fig.
The APEX improvement surroundings incorporate various tools. Of essential significance is the utility builder tool, which will be protected in depth beginning in Oracle Apex training. We commence right here by way of searching two pieces of equipment from the APEX SQL Workshop: the object browser, and the SQL command tool. This equipment permits you to at once manipulate the database at — the object browser offers you a graphical person interface, and the SQL command device lets you publish SQL Oracle PL/SQL code blocks, and statements are used for execution.
Oracle Apex Interview Questions Frequently Asked
Although the SQL Workshop equipment is no longer integral for software development, its usage of them can make your existence a lot easier. Here are 5 approaches that can assist a utility developer:
- To remind you of the database structure. For example, regular software entails countless tables, every of which can have several columns. It is frequently impractical to memorize the small print of everyone. When constructing a page that references a table, you can use this equipment to assist refresh your memory.
- To regulate the shape of the database. For example, this equipment is the best way to execute the alter desk command given in the introduction.
- To alter the contents of the database. For example, you may desire to insert or adjust information to check the conduct of a web page or to reset the database after trying out the page.
- Examine the contents of the database. After jogging a page, you can confirm that the database is up to date correctly.
- Debug an SQL assertion or PL/SQL block. By executing code in the SQL command device first, you can confirm that it produces the anticipated result earlier than you assign it as the cost of some property on a page.
Refer Also: Oracle PL/SQL Training
To get to the SQL Workshop, click on the SQL Workshop button on the APEX domestic screen. The ensuing display is proven under Figure. From this screen, you can then click on the Object Browser or SQL Commands button to get to the preferred tool.
Creating an Application
To use the utility builder, you want to get to its domestic screen. You can both click the Application Builder tab in the APEX menu bar or click on the giant Application Builder button from the APEX domestic display screen in Figures 1-2.
The utility builder’s domestic display screen shows an icon for every software in your workspace. It is probably that your APEX account has the preinstalled utility known as Sample Database Application; if so, your software builder domestic display screen appears like Fig below.
Editing Application Properties
The utility builder domestic display shows an icon for every software you create. Clicking an icon takes you to the domestic display for that application, which shows an icon for every of the application’s pages. If you created your utility as directed previously, its domestic display ought to show an icon for the domestic page. If you distinctive a specific structure of authentication, you will additionally see an icon for a Login page.
Deleting an Application
There are two methods to delete an application. At the proper of the application’s domestic screen, there is a project labeled Delete This Application; clicking the hyperlink performs the deletion. Alternatively, on the application’s world houses screen, there is a Delete button on the left of the Apply Changes button, which seems when the Definition houses are shown.
Running an Application Page
A net utility is a series of internet pages. By strolling a page, you are asking APEX to render it in your browser. The period strolling and software is shorthand for strolling its domestic page.
There are two approaches to running a page:
- From inside APEX (as a developer)
- From the backyard of APEX (as a user).
Each is viewed in the following sections.
Running a Page from inside APEX
The best way to run a utility from inside APEX is to click on the large Run Application button on the pinnacle left of the application’s domestic screen, as proven above
Fig: Home display screen of the newly created application.
Alternatively, you can go to the software builder’s domestic display screen and roll the cursor over the icon for the application; the icon will trade to show two smaller buttons as proven in Fig. The application is started by clicking the arrow button.
Conclusion
Oracle has created an effective improvement surrounding in the shape of a no-cost plugin for Oracle Databases referred to as Oracle APEX. It can be used for each fast improvement and fast prototyping. Oracle APEX offers an easy-to-use and at the identical time effective guide for authentication, authorization, and internationalization. In addition, with PL/SQL it is possible to create efficient, multilingual, impervious, and future-proof internet purposes which are unbiased in their dimensions.
