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Instead, rely on rolebased security or a ticket-based system whereby you authenticate users and prevent them from attempting to perform a restricted operation This model is also faster than trying to perform a database query under an invalid security account and waiting for an error Don t let the client use wide-open queries: Every query should judiciously select only the columns it needs Also, you should restrict the results with a WHERE clause whenever possible For example, when retrieving order records, you might impose a minimum date range (or an SQL clause such as TOP 1000) Without these safeguards, your application may work well at first but will slow down as the database grows and clients perform large queries, which can tax both the database and the network A good, straightforward design for a database component uses a separate class for every database table (or logically related group of tables).

As mentioned, will register a signal handler for every request that Django processes, checking for instances of every time a model is saved within a request. On most small sites, this additional overhead is hardly noticeable, but high-volume sites may notice a reduction in the quality of the user experience. The benefits of data surveillance aren t worth degrading the experience provided to your users. One way to keep overhead to a minimum is by restricting it to situations where updates are likely to take place. 7 explained how the HTTP standard expects certain methods to be safe simply viewing a document shouldn t make any changes. These safe methods are GET, HEAD, OPTIONS and TRACE; can be written to special-case these methods, bypassing any further handling.

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The common database access methods such as inserting, deleting, and modifying a record are all wrapped in separate stateless methods Finally, every database call uses a dedicated stored procedure Figure 8-1 shows this carefully layered design..

Figure 8-1. Layered design with a database class The following example demonstrates a simple database component. Rather than placing the database code in the web page, it follows a much better design practice of separating the code into a distinct class that can be used in multiple pages. This class can then be compiled as part of a separate component if needed. Additionally, the connection string is retrieved from the <connectionStrings> section of the web.config file, rather than being hard-coded. The data component actually consists of two classes a data package class that wraps a single record of information and a database utility class that performs the actual database operations with ADO.NET code.

To make it easier to shuffle information to the Northwind database and back, it makes sense to create an EmployeeDetails class that provides all the fields as public properties. Here s the full code for this class: public class EmployeeDetails { private int employeeID; public int EmployeeID { get {return employeeID;} set {employeeID = value;} } private string firstName; public string FirstName { get {return firstName;} set {firstName = value;} } private string lastName; public string LastName { get {return lastName;} set {lastName = value;} } private string titleOfCourtesy; public string TitleOfCourtesy { get {return titleOfCourtesy;} set {titleOfCourtesy = value;} } public EmployeeDetails(int employeeID, string firstName, string lastName, string titleOfCourtesy) { this.employeeID = employeeID; this.firstName = firstName; this.lastName = lastName; this.titleOfCourtesy = titleOfCourtesy; } } Note that this class doesn t include all the information that s in the Employees table in order to make the example more concise.

Before you can start coding the data access logic, you need to make sure you have the set of stored procedures you need in order to retrieve, insert, and update information. The following code shows the five stored procedures that are needed:

Even among requests that do modify data, not all views modify the models that are being managed by . There s no way for a third-party application like this to programmatically know which models are modified by which views, so the middleware simply looks at all of them. This can be avoided by only applying this middleware on those views that you know modify the affected models. To achieve this, we turn to , which contains the useful function that was shown in 7. This utility function takes a middleware, like our , and converts it into a decorator that can be applied to just those views that need its features. This new decorator can be provided in the middleware module, right alongside the middleware it accesses.

Rather than posting back the entire page, you can use a callback to fetch some specific information from the server. Callbacks are a new ASP.NET 2.0 feature, and we discuss them in 29.

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