class Person(models.Model): first_name = models.CharField(...) last_name = models.CharField(...) birth_date = models.DateField(...)
1，Performing raw SQL queries
SVN commit或import时出现 can't open file 'txn-current-lock' permission denied 的原因及解决方法
svn: can't open file 'txn-current-lock' permission denied
svn: Can't creat
In order for your app to take full advantage of the iPhone 4 Retina Display, you'll need to add 2x resources to your iPhone project.
If you're using SVN to manage your files, you'll be faced with somet