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s a framework, Django s purpose is to provide a cohesive set of interfaces to make the most common tasks easier. Some of these tools are contained entirely within Django itself, where it s easy to maintain consistency. Many other features are or at least, could be provided by external software packages. Although Django itself supports some of the most common software packages for these various features, there are many more out there, especially in corporate environments. In addition to a developer s preferences for one type of database over another, many other servers are already in use by existing applications that can t be easily converted to use something different. Since these types of problems do come up in real life, Django provides easy ways to reference these features without worrying about what implementation actually makes it happen in the background. This same mechanism also allows you to swap out many of these lower-level features with third-party code, to support connecting to other systems or just to customize some facet of behavior. The sections listed throughout this chapter serve something of a dual purpose. In addition to documenting Django s generic API for each of these features, each section will also describe how a new backend should be written to implement these features. This includes not only what classes and methods to declare, but also what the package structure might look like, as well as how each piece of the puzzle is expected to behave.

The UpdateUser method just accepts the modified MembershipUser you want to update. Before the method is called, you have to update the properties on your instance. This has just one exception: the IsLockedOut property cannot be set. This property gets automatically set if the user has too many failed login attempts. If you want to unlock a user, you have to call the MembershipUser s UnlockUser method separately. Similar rules apply to the password. You cannot change the password directly by setting some properties on the MembershipUser. Furthermore, the MembershipUser class has no property for directly accessing the password at all. For this purpose, it supports a GetPassword method and a ChangePassword method that requires you to pass in the old and the new password. Retrieving the password through the GetPassword method is possible, but only if the password is not hashed in the underlying store. Therefore, GetPassword works only if the Membership provider is configured to store the password either in clear text or encrypted in the underlying Membership store.

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Creating users is as simple as using the rest of the Membership API. You can create users by just calling the CreateUser method of the Membership class. Therefore, if you want to add the feature of creating users to your website, you can add a new page containing the necessary text boxes for entering the required information, then add a button, and finally catch the Click event of this button with the following code: protected void ActionAddUser_Click(object sender, EventArgs e) { try { MembershipCreateStatus Status; Membership.CreateUser(UserNameText.Text, PasswordText.Text, UserEmailText.Text, PwdQuestionText.Text, PwdAnswerText.Text, true, out Status); StatusLabel.Text = "User created successfully!"; } catch(Exception ex) { Debug.WriteLine("Exception: " + ex.Message); StatusLabel.Text = "Unable to create user!"; } } The CreateUser exists with several overloads. The easiest overload just accepts a user name and a password, while the more complex versions require a password question and answer as well. The MembershipCreateStatus object returns additional information about the creation status of the user and is added as an output parameter because the method already returns a new instance of MembershipUser. Depending on the provider s configuration, your call to simpler versions of CreateUser will succeed or fail. For example, the default Membership provider requires you to include a password question and answer; therefore, if you don t provide them, a call to CreateUser will result in an exception. Deleting users is as simple as creating users. The Membership class offers a Delete method that requires you to pass the user name as a parameter. It deletes the user as well as all related information, if you want, from the underlying Membership store.

Last but not least, the Membership class provides a method for validating a Membership user. If a user has entered his user name and password in a login mask, you can use this method for programmatically validating the information entered by the user, as follows: if (Membership.ValidateUser(UserNameText.Text, PasswordText.Text)) { FormsAuthentication.RedirectFromLoginPage(UserNameText.Text, false); } else { // Invalid username or password }

Summary

Connecting to databases is one of the most fundamental requirements of a modern Web application, and there are a great deal of options available. Currently, Django ships with support for some of the more popular open source database engines, including MySQL, PostgreSQL and SQLite, and even some commercial offerings such as Oracle. Given the unique features and SQL inconsistencies of different database systems, Django requires an extra layer between its models and the database itself, which must be written specifically for each database engine used. The supported options each ship within Django as a separate Python package containing this intermediary layer, but other databases can also be supported by providing this layer externally.

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