Singleton Pattern Added
Today’s design pattern is the Singleton pattern, which makes it impossible to have more than one instance of a class.
Perhaps you have multiple places in your codebase that attempt to open a connection to the database. Without some controls, your code could open multiple connections to the same database.
But with the Singleton pattern, if a connection is already open in an instance of the class, when you try to get an instance of the class, that same instance will always be used.