[Yii Framework] CdbExpression的用处
例如，要存储timestamp的值是用MySQL now()函数，这时候可以这样，
$post = new Post;
$post->createTime=new CdbExpression('NOW()');
//$post->createTime='NOW()';will not work because 'NOW()' will be treated as a string
$post->save();
例如，要存储timestamp的值是用MySQL now()函数，这时候可以这样，
$post = new Post;
$post->createTime=new CdbExpression('NOW()');
//$post->createTime='NOW()';will not work because 'NOW()' will be treated as a string
$post->save();
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