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    <p>I've come to a solution that I'm fairly happy with.</p> <p>Firstly created a view containing the searchable address fields concatenated:</p> <pre><code>CREATE VIEW address_concat AS SELECT address_id, CONCAT_WS(' ', address_name, address_line_1, address_line_2, suburb, postcode, state, country) AS full_address FROM address </code></pre> <p>When a request with a search string is received, I parse it in PHP and use the view to find matches (the following code is cleaned up and removes non-relevant things - the data is sanitised, etc):</p> <pre><code>$terms = explode(' ', preg_replace('/\s+/', ' ', $_GET['find_address'])); //get array of terms $where = " WHERE full_address LIKE '%".implode("%' AND full_address LIKE '%", $terms)."%' "; //turn array into WHERE clause //query database to find matches $result = $db-&gt;query("SELECT a.* FROM address a JOIN address_concat ac ON a.address_id = ac.address_id ".$where." ORDER BY IFNULL(IF(address_name = '', NULL, address_name), address_line_1)"); if ($result-&gt;num_rows &gt; 0) { //construct output $output = '&lt;ul&gt;'; while ($row = $result-&gt;fetch_assoc()) $output .= '&lt;li val_id="'.$row['address_id'].'"&gt;'.make_address(...).'&lt;/li&gt;'; $output .= '&lt;/ul&gt;'; } else $output = '&lt;p&gt;No matches found.&lt;/p&gt;'; </code></pre> <p>On the client side, I used some wisdom from <a href="https://stackoverflow.com/questions/4220126/run-javascript-function-when-user-finishes-typing-instead-of-on-key-up">other</a> <a href="https://stackoverflow.com/questions/14042193/how-to-trigger-an-event-in-input-text-after-i-stop-typing-writting">questions</a> to make it only query after a pause in typing.</p> <pre><code>var typingTimer; $('input#filterbox').bind('input', function () { var textfield = $(this); //code to hide/show "clear text field" box eliminated, etc clearTimeout(typingTimer); typingTimer = setTimeout(function () {doFilterUpdate(textfield);}, 750); }); function doFilterUpdate (target) { if (target.val().length &gt;= 3) $('div#resultlist').load('inc/ajax.php?find_address=' + encodeURIComponent(target.val())); else $('div#resultlist').html(''); } </code></pre> <p>I'm still not certain if creating the view is necessary/more efficient than just writing a query on the address table that uses CONCAT_WS in the WHERE clause... it does make the query a lot simpler, though :P</p>
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