Java MySQL Database Connection Class - DBConnected

This is a Java class for connecting to a database. It uses the MySQL JDBC driver to connect to the database.

In the constructor, the MySQL JDBC driver is first loaded, and then a database connection is established using the driver manager. The connection URL points to the local MySQL database server, the database name is 'phrobot', the username is 'root', and the password is 'ph030523'.

The getConnection() method returns the connection object, which can be used in other classes to perform database operations.

The close() method is used to close the database connection. If the close() method is not manually called after using the connection, the database connection will remain open, which may lead to resource leaks.

This is the English comment section of the class, the last line is the Chinese comment.