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An 8-byte (64-bit) floating-point number represents a fixed range of values between 1.79E308 to -2.23E-308 for negative values, zero, and 2.23E-308 to 1.79E308 for positive values. It maps to a double (System.Double) in C# and is defined as follows: In SQL Server, an 8-byte floating-point number is a float. You should use the SqlDbType.Float type identifier for parameters of this type. In MySQL, an 8-byte floating-point number is a double. Depending on the data provider, you should use the OdbcType.Double or MySqlClient.Double type identifier for parameters of this type. In Microsoft Access, an 8-byte floating-point number is represented as a Number data type and a Double field size. You should use the OleDbType.Double type identifier for parameters of this type.

It makes good sense to hide the rich error pages from ordinary users. However, the generic error pages really aren t that much more useful. The message they show has less information and won t reveal any secrets about your code (Figure 8-13), but it s still confusing for mere mortals. ASP .NET allows you to replace the generic error page with a custom error page of your own devising. The next section shows you how.

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In a deployed application, you should use the On or RemoteOnly error mode. Any errors in your application should be dealt with through error-handling code, which can then present a helpful and user-oriented message (rather than the developer-oriented code details in ASP .NET s rich error messages). However, you can t catch every possible error in an ASP .NET application. For example, a hardware failure could occur spontaneously in the middle of an ordinary code statement that could not normally cause an error. More commonly, the user might encounter an HTTP error .NET allows you to handle these problems with cusby requesting a page that doesn t exist. ASP tom error pages. You can implement custom error pages in two ways. You can create a single generic error .NET to use it by modifying the web.config file as shown here: page and configure ASP <configuration> <system.web> <customErrors mode="RemoteOnly" defaultRedirect="DefaultError.aspx" /> </system.web> </configuration> .NET will now exhibit the following behavior: ASP

Listing 3-7 shows the new version of User.php, which now defines the list of user types, as well as ensuring that a valid user type is set. It also changes the password value, when it is set, to be an MD5 hash. Listing 3-7. The New Version of DatabaseObject_User, Now Setting the Password and User Type Correctly (User.php) < php class DatabaseObject_User extends DatabaseObject { static $userTypes = array('member' => 'Member', 'administrator' => 'Administrator'); public function __construct($db) { parent::__construct($db, 'users', 'user_id'); $this->add('username'); $this->add('password'); $this->add('user_type', 'member'); $this->add('ts_created', time(), self::TYPE_TIMESTAMP); $this->add('ts_last_login', null, self::TYPE_TIMESTAMP); } public function __set($name, $value) { switch ($name) { case 'password': $value = md5($value); break; case 'user_type': if (!array_key_exists($value, self::$userTypes)) $value = 'member'; break; } return parent::__set($name, $value); } } >

The Players detailed in this table have a relationship to several other tables in the database Every Player needs a Manufacturer to build it, and each Player supports one or more Formats The PlayerManufacturer column details which Manufacturer builds the Player This looks okay, but hang on a minute; it s not terribly efficient The following two problems spring to mind: What happens if a Manufacturer changes its name Suppose that a Manufacturer changes its name, say from iRiver to iStream Potentially, you would need to look through every row in the Player table and any other tables in the database that are related to the Manufacturer table and change any reference to iRiver If you miss an entry, and then a page looks up details for iRiver, it won t exist according to the database because it has changed its name Things could easily start to go wrong.

GetDirectories() and GetFiles()

Now that we have created the DatabaseObject_User class, let s look at how to use it. Listing 3-8 shows the typical usage of a DatabaseObject child class: we first set some properties and then call the save() method (which will perform an SQL insert). Next we modify some properties

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