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Can you connect to more than one database with PDO?
You don’t appear to be using $db1, $db2, and $db3 at all as the database accesses are all being done via $pdo. As long as the databases are on the same server and use the same username and password you can access them all from the one query simply by connecting to one of the databases.
Which is the best way to use PDO in PHP?
In case of PHP, better PHP means object-oriented PHP. This means the more you get to use objects, the better you can test your code, write reusable components, and, usually, increase your salary. Using PDO is the first step in making the database layer of your application object-oriented and reusable.
Can you write object oriented code with PDO?
Using PDO is the first step in making the database layer of your application object-oriented and reusable. As you will see in the rest of this article, writing object-oriented code with PDO is much simpler than you may think.
Do you leave persistent PDO connections to ODBC?
If you’re using the PDO ODBC driver and your ODBC libraries support ODBC Connection Pooling (unixODBC and Windows are two that do; there may be more), then it’s recommended that you don’t use persistent PDO connections, and instead leave the connection caching to the ODBC Connection Pooling layer.
Can a database be connected to more than one server?
As long as the databases are on the same server and use the same username and password you can access them all from the one query simply by connecting to one of the databases. If one of the databases ever gets moved to a different server then they will no longer be accessible through the same query.
Is there a password for the local database?
The local databases have no username or password (thus the “root, root”), while I changed the online usernames and passwords for this post. It appears to be working locally and online both. Thanks for the tips.