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For 2021 - online Python 3 training - see ((here)).

Our plans were to retire in summer 2020 and see the world, but Coronavirus has lead us into a lot of lockdown programming in Python 3 and PHP 7.
We can now offer tailored online training - small groups, real tutors - works really well for groups of 4 to 14 delegates. Anywhere in the world; course language English.

Please ask about private 'maintenance' training for Python 2, Tcl, Perl, PHP, Lua, etc.
Easy selection of multiple SQL conditions from PHP

Are you automating an SQL query in a web page, wanting to select records to display only where they match a whole series of criteria from what could be a long list of options - for example looking for houses:

* Only in Melksham
* Less that 200k
* With a large garden

and other criteria that perhaps are required by other users might include:

* Near a good school
* Near public transport
* Ground floor
* Parking

If all that data is in your database - good, you can do it. But how do you build up the complex query? One useful trick is to have an array of possible queries, then push all the ones that you actually want into a further array and link them together with an implode putting an " and" between each element ..

$selectors = array(
  "cheap" => "asking < 200000",
  "local" => 'locate = "Melksham"',
  "bathphone" => 'phone like "01225%"');
$cwant = array();
foreach (array_keys($selectors) as $cdi) {
  if ($_GET[$cdi]) {
    array_push($cwant, $selectors[$cdi]);
  }
}
$restrict = implode (" and ",$cwant);


Demo here
Full source code here
(written 2007-11-30)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
S156 - Interfacing Applications to MySQL Databases
  [104] mysql_connect or mysql_pconnect in PHP? - (2004-10-30)
  [644] Using a MySQL database from Perl - (2006-03-13)
  [663] Python to MySQL - (2006-03-31)
  [723] Viewing images held in a MySQL database via PHP - (2006-05-17)
  [1381] Using a MySQL database to control mod_rewrite via PHP - (2007-10-06)
  [1518] Downloading data for use in Excel (from PHP / MySQL) - (2008-01-25)
  [1561] Uploading to a MySQL database through PHP - examples and common questions - (2008-03-02)
  [1885] Hiding a MySQL database behind a web page - (2008-11-15)
  [2263] Mysqldump fails as a cron job - a work around - (2009-06-30)
  [2381] Checking the database connection manually - (2009-08-28)
  [2745] Connecting Python to sqlite and MySQL databases - (2010-04-28)
  [2790] Joining a MySQL table from within a Python program - (2010-06-02)
  [3035] How to display information from a database within a web page - (2010-11-07)
  [3099] Perl - database access - DBD, DBI and DBIx modules - (2010-12-22)
  [3447] Needle in a haystack - finding the web server overload - (2011-09-18)
  [3455] MySQL, MySQLi, PDO or something else - how best to talk to databases from PHP - (2011-09-24)
  [4436] Accessing a MySQL database from Python with mysql.connector - (2015-02-21)


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This is a page archived from The Horse's Mouth at http://www.wellho.net/horse/ - the diary and writings of Graham Ellis. Every attempt was made to provide current information at the time the page was written, but things do move forward in our business - new software releases, price changes, new techniques. Please check back via our main site for current courses, prices, versions, etc - any mention of a price in "The Horse's Mouth" cannot be taken as an offer to supply at that price.

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