WordPress database access abstraction class.

Connects to the database server and selects a database.

Makes private properties readable for backward compatibility.

Makes private properties check-able for backward compatibility.

Makes private properties settable for backward compatibility.

Makes private properties un-settable for backward compatibility.

Internal function to perform the mysql_query() call.

Escapes data. Works on arrays.

Helper function for insert and replace.

Real escape, using mysqli_real_escape_string() or mysql_real_escape_string().