| |||
Sample help file
PHP and MySQL example application - adhoc database analysis example from a Well House Consultants training course
More on PHP and MySQL example application - adhoc database analysis [link] Source code: help1.txt Module: H204
Ad Hoc Query tool for SQL
With an SQL Query, there are certain elements (such as which tables are joined to which other tables, and on which fields) which are naturally fixed, and other elements (such as which columns are wanted on the output, and which rows are to be chosen) which may vary from one query to another - especially in an application where a database is being used to store large amounts of data gathered for statistical analysis. <br><br> This demonstration program, written for training purposed by Graham Ellis of Well House Consultants, allows a standard query to be embedded into a configuration file that can't be altered by the user, and then allows the user to select which rows and columns are required on the report. The configuration file also allows the specification of what inputs the user has in making selections - columns can be turned on or off by default, and the criteria for row selection can also be limited. <br><br> <b>If you want to try out this demo, you may do so; we've loaded it onto this website at <a href=/adhoc/adhoc_sql_query_engine.php> /adhoc/adhoc_sql_query_engine.php</a> and it's got a login name of "demo" with a password of "xxx111".</b>. If you would like to see the source code of all the files, there are links to them from <a href=/resources/H204.html>the module description</a> <hr> <b>System Overview</b> This demonstration is based on a 4 layer model, keeping the main application, web helper routines, business logic and HTML templates each in its own file. The top layer is the file adhoc_sql_query_engine.php and you'll find that it<br><br> 1. Establishes / picks up the current session<br> 2. Checks inputs made on the form just enters<br> 3. Decides which is the next form<br> 4. Prepares for the next form<br> 5. Completes and sends out the next template<br><br> All pages in the system are numbered - and that number is tracked in the variable $current. A simple run of the system would be:<br> Page 1 - Login<br> Page 10 - Select a default or tuned query<br> Page 11 - Select the ROWS you want<br> Page 12 - Select the COLUMNS you want<br> Page 20 - Display results<br> Page 199 - Logout<br><br> You'll go straight from page 10 to page 20 if you select the default query, and you're able to jump back from page 20 to page 10 if you want to run a series of queries without logging in many times over.<br><nr> <b>Extensions</b><br> If this demonstration was extended, logins would be validated against a database (and not just hard coded) and perhaps there would be a "lost password" system too. Learn about this subject
Books covering this topic
Yes. We have over 700 books in our library. Books
covering PHP are listed here and when you've selected a
relevant book we'll link you on to Amazon to order.
Other Examples
This example comes from our "PHP and MySQL example application - adhoc database analysis" training module. You'll find a description of the topic and some
other closely related examples on the "PHP and MySQL example application - adhoc database analysis" module index page.
Full description of the source code
You can learn more about this example on the training courses listed on this page,
on which you'll be given a full set of training notes.
Many other training modules are available for download (for limited use) from our download centre under an Open Training Notes License. Other resources
• Our Solutions centre provides a number of longer technical articles.
• Our Opentalk forum archive provides a question and answer centre. • The Horse's mouth provides a daily tip or thought. • Further resources are available via the resources centre. • All of these resources can be searched through through our search engine • And there's a global index here. Web site author
Purpose of this website
This is a sample program, class demonstration or answer from a
training course. It's main purpose
is to provide an after-course service to customers who have attended our
public private or
on site courses, but the examples are made
generally available under conditions described below.
Conditions of use
Past attendees on our training courses are welcome to use individual
examples in the course of their programming, but must check
the examples they use to ensure that they are suitable for their
job. Remember that some of our examples show you how not to do
things - check in your notes. Well House Consultants take no responsibility
for the suitability of these example programs to customer's needs.
This program is copyright Well House Consultants Ltd. You are forbidden from using it for running your own training courses without our prior written permission. See our page on courseware provision for more details. Any of our images within this code may NOT be reused on a public URL without our prior permission. For Bona Fide personal use, we will often grant you permission provided that you provide a link back. Commercial use on a website will incur a license fee for each image used - details on request. | |||
PH: 01144 1225 708225 • EMAIL: info@wellho.net • WEB: http://www.wellho.net • SKYPE: wellho PAGE: http://www.wellho.net/resources/ex.php4 • PAGE BUILT: Sun Oct 11 14:50:09 2020 • BUILD SYSTEM: JelliaJamb |