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POMysql Query has me at a loss
 

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  1. POMysql Query has me at a loss
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    <p><strong>New Post</strong> I ended up avoiding that query entirely. I just couldn't get the results I was looking for. To get the desired results, I came up with this...</p> <p>Also, if you guys come up with that query, I'd really look to remove this work around.</p> <p>Thanks for all the help so far!</p> <pre><code>function get_converstations($data) { //get possible senders into an array $sender_sql = "SELECT DISTINCT `users`.`aid` AS `aid`, `users`.`nickname` AS `nickname` FROM `users`,`messages` WHERE `messages`.`sender` = '".$data['aid']."' AND `messages`.`recipient` = `users`.`aid`"; $query = mysql_query($sender_sql); if(mysql_num_rows($query) &gt; 0) { $sender_data = array(); while ($row = mysql_fetch_array($query)){ $sender_data[$row['aid']] = $row['nickname']; } } //get possible recipients into an array $recipient_sql = "SELECT DISTINCT `users`.`aid`, `users`.`nickname` FROM `users`,`messages` WHERE `messages`.`recipient` = '".$data['aid']."' AND `messages`.`sender` = `users`.`aid`"; $query = mysql_query($recipient_sql); if(mysql_num_rows($query) &gt; 0) { while ($row = mysql_fetch_array($query)){ $recipient_data[$row['aid']] = $row['nickname']; } } //merge the arrays to overrite any duplicate people. $no_keys_persons = array_merge($sender_data, $recipient_data); //create a new array with keys foreach($no_keys_persons as $aid =&gt; $nickname) { $persons[] = array( "aid" =&gt; $aid, "nickname" =&gt; $nickname ); } //print_r($persons); //create the conversations array foreach($persons as $person) { $sql = "SELECT * FROM `messages` WHERE `sender` = '".$data['aid']."' AND `recipient` = '".$person['aid']."' OR `sender` = '".$person['aid']."' AND `recipient` = '".$data['aid']."' ORDER BY `id` DESC LIMIT 1"; $query = mysql_query($sql); if(mysql_num_rows($query) &gt; 0) { while($row = mysql_fetch_array($query)) { $conversations[] = array( "person_aid" =&gt; $person['aid'], "person_nickname" =&gt; $person['nickname'], "sender" =&gt; $row['sender'], "recipient" =&gt; $row['recipient'], "body" =&gt; $row['body'], "timestamp" =&gt; $row['timestamp'], "ip" =&gt; $row['ip'] ); } } } //print_r($conversations); return $conversations; } </code></pre> <p>Then when I call that function on my controller..</p> <pre><code>//create the data array from url $data = array( "aid" =&gt; $_GET['aid'], "nickname" =&gt; $_GET['nickname'], "ip" =&gt; $_SERVER['REMOTE_HOST'], ); //instantiate any classes include 'db.php'; include 'messages_model.php'; $messages = new messages_model(); $coversations = $messages-&gt;get_converstations($data); foreach ($coversations as $conversation) { echo '&amp;conversation='; echo '&amp;sender='.$conversation['sender']; if($conversation['sender'] === $data['aid']) { echo '&amp;sender_nickname='.$data['nickname']; } else { echo '&amp;sender_nickname='.$conversation['person_nickname']; } echo '&amp;recipient='.$conversation['recipient']; if($conversation['recipient'] === $data['aid']) { echo '&amp;recipient_nickname='.$data['nickname']; } else { echo '&amp;recipient_nickname='.$conversation['person_nickname']; } echo '&amp;body='.$conversation['body']; echo '&amp;timestamp='.$conversation['timestamp']; } </code></pre> <p><strong>Original Post</strong> I am at a loss here guys. Please see if you can help me put this query together.</p> <p>I have a table called messages.</p> <pre><code> CREATE TABLE `db.app`.`messages` ( `id` INT( 32 ) NOT NULL AUTO_INCREMENT , `sender` VARCHAR( 64 ) NOT NULL , `recipient` VARCHAR( 64 ) NOT NULL , `body` TEXT NOT NULL , `timestamp` INT( 32 ) NOT NULL , PRIMARY KEY ( `id` ) ) ENGINE = MYISAM ; </code></pre> <p>And a table called users.</p> <pre><code> CREATE TABLE `db.app`.`users` ( `id` INT( 32 ) NOT NULL AUTO_INCREMENT , `nickname` VARCHAR( 64 ) NOT NULL , PRIMARY KEY ( `id` ) ) ENGINE = MYISAM ; </code></pre> <p>When a message is made, it inserts the ID of the sender into <code>messages</code>.<code>sender</code>, the ID of the recipient into <code>messages</code>.<code>recipient</code>, the message body, and UNIX timestamp. This is working fine.</p> <p>My problem lies with getting a list of all the unique conversations. (Like text messages on iPhones).</p> <p>so if we have data like so... </p> <pre><code>messages table; id | sender | recipient | body | timestamp 1 | 1234 | 5678 | testing message | 1290233086 2 | 5678 | 1234 | testing reply | 1290233089 </code></pre> <p></p> <pre><code>users table; id | nickname 1234 | john 5678 | peter </code></pre> <p>I would like to be able to generate query results like so... </p> <pre><code>results; other_person_id | other_person_nickname | last_message | last_message_timestamp 1234 | john | testing reply | 1290233089 </code></pre> <p>For the life of me, I cant figure out this query....</p>
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    1. COAdd one more table `converstaions` then ;-)
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    2. COI was thinking about that, Is that really the only solution?
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    3. COThere's nothing that tells us if a message belongs to a conversation in particular. What if John had a conversation with Peter, and one month later they had a whole new conversation ?
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      1. USVincent Savard
 

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