问题描述
我想知道为什么Class.forName("com.mysql.jdbc.Driver");和Class.forName("com.mysql.jdbc.Driver").newInstance();在我使用它们连接到数据库时都起作用.没错，因为没有创建新实例，所以前者不是不应该工作的.但是，它仍然有效.我正在使用netbeans 6.9.1.感谢您的输入！
Was wondering why both Class.forName("com.mysql.jdbc.Driver"); and Class.forName("com.mysql.jdbc.Driver").newInstance(); work when i use them to connect to a database. By right, isn't the former not supposed to work, since no new instance was created. And yet, it still works. Im using netbeans 6.9.1. Thanks for your input!
推荐答案
Class.forName("xxx")不会创建与数据库的连接，它只是加载JDBC驱动程序并对其进行注册，以便随后的DriverManager.getConnection(...)调用将起作用.不需要自己实例化驱动程序.
Class.forName("xxx") doesn't create a connection to the database, it just loads the JDBC driver and registers it so that a subsequent DriverManager.getConnection(...) call will work. Instantiating the driver yourself is not necessary.
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