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POCapture mysql database error and use it in php
 

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  1. POCapture mysql database error and use it in php
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    <p>I created the following table for user to user subscriptions.</p> <pre><code>CREATE TABLE IF NOT EXISTS `subscriptions` ( `id` int(11) NOT NULL AUTO_INCREMENT, `user_id` int(11) NOT NULL, `subscribed_to` int(11) NOT NULL, `date` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP, PRIMARY KEY (`id`), UNIQUE KEY `unique_subscription` (`user_id`,`subscribed_to`) ) ENGINE=MyISAM DEFAULT CHARSET=latin1 AUTO_INCREMENT=76 ; </code></pre> <p>I'm disallowing identical rows by making the columns <code>user_id</code> and <code>subscribed_to</code> unique. If a user tries to resubmit the same data I get:</p> <blockquote> <p>A Database Error Occurred Error Number: 1062</p> <p>Duplicate entry '62-88' for key 'unique_subscription'</p> <p>INSERT INTO subscriptions (user_id, subscribed_to, date) VALUES ('62', '88', '2011-07-11 19:15:13')</p> <p>Line Number: 330</p> </blockquote> <p>I'm preventing the database error by checking if an identical row exists before trying to insert data.</p> <pre><code>$query = "SELECT COUNT(*) FROM subscriptions WHERE (user_id = '62' AND subscribed_to = '88')"; if ($query &gt; 0) { //display already subscribed message } else { //insert new row } </code></pre> <p>The database already checks the table and returns an error. The <code>select count(*)</code> query above seems redundant. Do I really need to check the table once more in my application? Is there a way to capture the database error if it occurs, and do something with that in my application?</p> <p>If you have an idea how please share an example. I haven't a clue how this is done..!</p>
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