在Yii中，为什么教程引用了类方法::

Question

It's a simple question but since I am a beginner, it confuses me.

In the tutorials, for example: http://www.yiiframework.com/doc/guide/1.1/en/database.dao it references methods like this:

1. Executing SQL Statements

Once a database connection is established, SQL statements can be executed using CDbCommand. One creates a CDbCommand instance by calling CDbConnection::createCommand() with the specified SQL statement:

But in the specification http://www.yiiframework.com/doc/api/1.1/CDbConnection#createCommand-detail it says public CDbCommand createCommand(mixed $query=NULL)

As far as I know the :: are for static methods/properties.

I know I am missing something because they use this format everywhere.

Thanks!

Answer 1

In this case, Paamayim Nekudotayim :: is used just to point out that a method is part of a class : method createCommand is a CDbConnection method, but this does not mean that you have to use it as static.