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Database operation class

PDO writes PDO class based on singleton mode

Database operation class

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PDO writes PDO class based on singleton mode

The singleton mode is introduced to ensure that this class will not be instantiated repeatedly in global calls, reducing the waste of system resources. An object (before learning the design pattern, you need to have a better understanding of the orientation Object thinking) is only responsible for a specific task.

The application of PHP is mainly in database applications, so there will be a large number of database operations in an application. Using the singleton mode can avoid a large number of resources consumed by new operations.

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Working with Databases in WordPress

15 Feb 2025

WordPress database interaction guide: mastering wpdb class and database operation skills WordPress comes with a large number of database interaction functions. WP_Query class and wp_insert_post, update_post_meta, get_posts and other functions are usually enough to deal with most situations. However, especially when dealing with custom tables, we sometimes need to do things that cannot be achieved by WordPress native features. This tutorial will explore the most important class in WordPress database interaction - wpdb, and share some development tips. We will introduce the dbDelta function used to create custom tables, but will not cover creating initial Word