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Figure 22-9. Displaying filtered data Again, the filtering logic is based on standard SQL syntax. For example, assume you wish to obtain the results of the previous Select() invocation alphabetically, based on the pet name. In terms of SQL, this translates into a sort based on the PetName column. Fortunately, the Select() method has been overloaded to send in a sort criterion: // Sort by PetName. makes = inventoryTable.Select(filterStr, "PetName"); Call Select() as seen here if you want the results in descending order: // Return results in descending order. makes = inventoryTable.Select(filterStr, "PetName DESC"); In general, the sort string contains the column name, followed by ASC (ascending, which is the default) or DESC (descending). If necessary, you can separate multiple columns by commas. Finally,

There are other less commonly used protocols for Windows authentication. One example is certificatebased authentication. If you use this approach, you must distribute a digital certificate to each client and map each certificate to the appropriate Windows account. Unfortunately, this technique is rife with administrative and deployment headaches. Additionally, IIS 6 supports Advanced Digest authentication (which works essentially the same way as Digest authentication but stores the passwords more securely) and Passport authentication, which allows a user to log in using a Passport account that maps to a Windows user account.

public void setUserDao(UserDao userDao) { this.userDao = userDao; } public void removeUserByEmail(String email) { this.userDao.removeUserByEmail(email); } public User getUserByUsername(String username) { return userDao.findByUsername(username); } public void doLogout() { String username = "unknown"; try { username = SecurityContextHolder.getContext().getAuthentication().getName(); FlexContext.setUserPrincipal(null); FlexContext.getHttpRequest().getSession().invalidate(); FlexContext.getFlexSession().invalidate(); SecurityContextHolder.clearContext(); } catch (RuntimeException e) { //dosomething like logging } } }

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understand that a filter string can be composed of any number of relational operators. For example, assume you want to find all cars with an ID greater than 5. This helper function lets you accomplish that: private void ShowCarsWithIdGreaterThanFive() { // Now show the pet names of all cars with ID greater than 5. DataRow[] properIDs; string newFilterStr = "ID > 5"; properIDs = inventoryTable.Select(newFilterStr); string strIDs = null; for(int i = 0; i < properIDs.Length; i++) { DataRow temp = properIDs[i]; strIDs += temp["PetName"] + " is ID " + temp["ID"] + "\n"; } MessageBox.Show(strIDs, "Pet names of cars where ID > 5"); }

The most widely supported authentication protocol is Basic authentication. Almost all web browsers support it. When a website requests client authentication using Basic authentication, the web browser displays a login dialog box for user and password, like the one shown in Figure 22-2.

The final aspect of the DataTable you should be aware of is the process of updating an existing row with new values. One approach is to first obtain the row(s) that match a given filter criterion using the Select() method. Once you obtain the DataRow(s) in question, modify them accordingly. For example, assume you have a new Button on your form named btnChangeMakes that (when clicked) searches the DataTable for all rows where Make is equal to BMW. Once you identify these items, you change the Make from BMW to Yugo: // Find the rows you want to edit with a filter. private void btnChangeMakes_Click(object sender, EventArgs e) { // Confirm selection. if (DialogResult.Yes == MessageBox.Show("Are you sure BMWs are much nicer than Yugos!", "Please Confirm!", MessageBoxButtons.YesNo)) { // Build a filter. string filterStr = "Make='BMW'"; string strMake = string.Empty; // Find all rows matching the filter. DataRow[] makes = inventoryTable.Select(filterStr); // Change all Beemers to Yugos! for (int i = 0; i < makes.Length; i++) { makes[i]["Make"] = "Yugo"; } } }

After a user provides this information, the data itself is transmitted to the web server (in this case localhost). Once IIS receives the authentication data, it attempts to authenticate the user with the corresponding Windows account. The key limitation of Basic authentication is that it isn t secure at least not on its own. User name and password credentials obtained via Basic authentication are transmitted between the client and server as clear text. The data itself is encoded (not encrypted) into a Base64 string that eavesdroppers can easily read. For this reason, you should use Basic authentication only in situations where there s no need to protect user credentials or only in conjunction with an HTTP wire encryption protocol such as SSL. This way, the data that would otherwise be clearly visible to any network sniffing utility will be encrypted using complex algorithms. (You can find more information on SSL in 18.)

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