PDO, or PHP Data Objects, is a database abstraction extension that allows you to use a common set of commands to access any database for which PDO has a driver. This includes MySQL and compatibles (e.g., MariaDB), PostgreSQL, Oracle, Microsoft SQL Server, IBM DB2, SQLite, and others. While it’s nice not having to rewrite all […]
Joins This intends to provide a brief summary of JOIN operations. I’m attempting to follow standard SQL here where possible, thus avoiding, say, Oracle terminology like ANTIJOIN and SEMIJOIN. All SQL databases that I’ve encountered perform LEFT/RIGHT/INNER JOIN as expected, but others will show some variation. When in doubt, refer to your documentation. The generic […]
If you have a multi-site Drupal 7 install, or simply another database living alongside your Drupal database, sometimes you may want to pull a few records from the other database for display on your Drupal site. Displaying data from the Drupal database is pretty easy since you can just use Drupal’s built-in db_query function: (If […]
A simple bash script to back up MySQL databases. This backs up every database on the server to individual gzipped files in the directory you specify so that you can easily restore them separately. If you want it to run everyday, save it with an .sh extension and add it to the crontab of an […]