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    <p>So i've assume you have only 1 MySQL database (minimum package on your webhost) and need to store a copy of a system for each of your clients.</p> <p>What I was suggesting, is that you create a separate set of tables as you already are (for each client), but the name wont matter because you have a look-up of the table names in your clients table.</p> <p>Heres my example for you: The clients table should store the table names of their own tables<br> (e.g. users_tbl = clientone_users for client id:1) So that later on you can just query the clients table and get his/her table names, then use that result to query on his/her user, news, pages, and files tables.</p> <pre><code># SQL: new table structure -- store the names of the clients tables here CREATE TABLE clients( id INT NOT NULL AUTO_INCREMENT, PRIMARY KEY(id), name VARCHAR(50), address VARCHAR(250), email VARCHAR(50), pass BLOB, /* table names*/ users_tbl VARCHAR(70), news_tbl VARCHAR(70), pages_tbl VARCHAR(70), files_tbl VARCHAR(70) ) ENGINE = InnoDB; # PHP: Some definitions for the table structure $tbl_names = array("_users","_news","_pages","_files"); $tbl_fields = array(); $tbl_fields[0] = array("id INT","users_col1 VARCHAR(10)","users_col2 VARCHAR(20)"); $tbl_fields[1] = array("id INT","news_col1 DATE",...); $tbl_fields[2] = array(...); $tbl_fields[3] = array(...); // refers to YOUR clients table field names (see above) $clients_fields = array("users_tbl", "news_tbl", "pages_tbl", "files_tbl"); # PHP: Create a user and create the users database function createUser($name, $address, $email, $pass, $salt) { global $db, $tbl_names, $tbl_fields; $success = false; if ($db-&gt;beginTransaction()) { $sql = "INSERT INTO clients(name, address, email, pass) VALUES (?, ?, ?, AES_ENCRYPT(?, ?));" $query = $db-&gt;prepare($sql); $query-&gt;execute(array($name, $address, $email, $pass, $salt)); if ($query-&gt;rowCount() == 1) { # if rowCount() doesn't work # get the client ID # there are alternative ways $client_id = $db-&gt;lastInsertId(); for ($i=0; $i&lt;sizeof($tbl_names); $i++) { $client_tbl_name = $name . $tbl_names[$i]; $sql = "CREATE TABLE " . $client_tbl_name . "(" . implode(',', $tbl_fields[$i]) . ");"; if (!$db-&gt;query($sql)) { $db-&gt;rollBack(); return false; } else { $sql = "UPDATE clients SET ".clients_fields[$i]."=? " ."WHERE id=?;"; $query = $db-&gt;prepare($sql); if (!$query-&gt;execute( array($client_tbl_name, (int)$client_id) )) { $db-&gt;rollBack(); return false; } } } $db-&gt;commit(); $success = true; } if (!$success) $db-&gt;rollBack(); } return $success; } # PHP: Get the Client's table names function getClientsTableNames($client_id) { $sql = "SELECT (users_tbl, news_tbl, pages_tbl, files_tbl) FROM clients WHERE id=?;"; $query = $db-&gt;prepare($sql); if ($query-&gt;execute(array((int)$client_id))) return $query-&gt;fetchAll(); else return null; } # PHP: Use the table name to query it function getClientsTable($client_id, $table_no) { $table_names = getClientsTableNames($client_id); if ($table_names != null &amp;&amp; isset($table_names[$table_no])) { $sql = "SELECT * FROM ".$table_names[$table_no].";"; $query = $db-&gt;prepare($sql); if ($query-&gt;execute(array((int)$client_id))) return $query-&gt;fetchAll(); } return null; } </code></pre>
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    1. COI think I will lose some performance, but basically, it is like `self::prepare('SELECT * FROM ' . self::getPrefix([$dbname if multiple DB, or null for current DB]) . 'usuarios WHERE usuario = :username LIMIT 1');`.. (static member could be `$this->getPrefix()`, or `$db->getPrefix()`, etc)
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    2. COI just used the normal PDO, PDOStatement code, but if you see what I'm saying you can just alter the code to work with your database abstraction layer.
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    3. COYes yes, I'm talking: with this way, I need to have a method/function to insert the prefix. For this, I can store the prefix in config.php and get with `$db->getPrefix()` for instance, which is the easiest way.. With this approach, what about `self::prepare('SELECT * FROM #__usuarios WHERE usuario = :username LIMIT 1');`, and inside my Model `prepare()` replace `#__` to config.php defined table prefix.
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