PDO with table prefix - php

Question

I have the follow Model class, which all my models extends.
class Model {
[...]
protected static $_query; // Query preparated
public function prepare($query = null) {
[...] // Connect to PDO, bla bla bla
self::$_query = self::$link->prepare($query);
}
[...]
}
class Login extends Model {
public function getUser($username = null) {
self::prepare('SELECT * FROM usuarios WHERE usuario = :username LIMIT 1');
self::bindValue('username', $username);
return self::fetch();
}
}
The problem is, I need to insert prefix to my mysql, to avoid table conflicts, but don't want to edit all my querys.
clientone_tablename
clienttwo_tablename
clientthree_tablename
How I can do this, parse and insert table prefix when prepare the query?
I have not tried nothing because what I know is, extend my custom PDO to PHP PDO class, which is not much now..
I have seen this: PDO - Working with table prefixes. But don't worked propertly..
Thanks!

Answer 1

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.
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.
Heres my example for you: The clients table should store the table names of their own tables
(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.
# 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->beginTransaction()) {
$sql = "INSERT INTO clients(name, address, email, pass)
VALUES (?, ?, ?, AES_ENCRYPT(?, ?));"
$query = $db->prepare($sql);
$query->execute(array($name, $address, $email, $pass, $salt));
if ($query->rowCount() == 1) { # if rowCount() doesn't work
# get the client ID # there are alternative ways
$client_id = $db->lastInsertId();
for ($i=0; $i<sizeof($tbl_names); $i++) {
$client_tbl_name = $name . $tbl_names[$i];
$sql = "CREATE TABLE " . $client_tbl_name . "("
. implode(',', $tbl_fields[$i]) . ");";
if (!$db->query($sql)) {
$db->rollBack();
return false;
} else {
$sql = "UPDATE clients SET ".clients_fields[$i]."=? "
."WHERE id=?;";
$query = $db->prepare($sql);
if (!$query->execute(
array($client_tbl_name, (int)$client_id)
)) {
$db->rollBack();
return false;
}
}
}
$db->commit();
$success = true;
}
if (!$success) $db->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 = $db->prepare($sql);
if ($query->execute(array((int)$client_id)))
return $query->fetchAll();
else
return null;
}
# PHP: Use the table name to query it
function getClientsTable($client_id, $table_no) {
$table_names = getClientsTableNames($client_id);
if ($table_names != null && isset($table_names[$table_no])) {
$sql = "SELECT * FROM ".$table_names[$table_no].";";
$query = $db->prepare($sql);
if ($query->execute(array((int)$client_id)))
return $query->fetchAll();
}
return null;
}

Answer 2

Just rewrite your queries to use a table prefix found in a variable somewhere. Parsing all your queries for tablenames is more trouble than it is worth. (Do you really want to write an SQL parser?)