Simple .NET/ASP.NET PDF document editor web control SDK

The fact of the matter is that Windows-based and Passport-based authentication is typically not a valid solution for large-scale public websites. For applications of this type, the most common authentication option will be Forms-based, which splits the workload between the .NET framework itself and the web developer. The developer is required to build a logon page and author the necessary code to compare the values of the supplied credentials and the persisted credentials. The framework responds by automatically redirecting the user to the requested page upon successful validation. If the validation is successful, the framework attaches an authentication ticket (issued by default as a cookie) to the current request. Figure 5-7 illustrates the Forms-based authentication model.

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In this section, we briefly outline the ability of a result set to see two types of changes: Internal changes: Changes made within the result set by using the update, delete, or insert operation on the result set itself External changes: Changes made outside the result set, either from the current transaction or from a different session

allocated for the entire array. Arrays of other types are stored as an array of object references. Primitive types such as integers and floating-point numbers are all value types, and many other .NET types are also value types. The .NET documentation indicates whether each type is a value type or not. Often the word struct is used for value types. You can also define new struct types directly in F# code, discussed in 6. All other types in F# are reference types, such as all record, tuple, discriminated union, and class and interface values.

A change being visible means that you can automatically (i.e., without refetching rows) see new data values from internal or external changes made to the result set rows. Table 7-8 summarizes the result set s visibility into different type of changes depending on the result set type. Table 7-8. Result Set s Visibility Depending on Type

Note The authentication ticket is automatically encrypted (using Triple-DES) and protected via data validation to prevent any across the wire tampering.

In 3, you saw in passing that you can use sequence expressions as a way to generate interesting array values. For example: > let arr = [| for i in 0 .. 5 -> (i,i*i) |];; val arr : (int*int)[] > arr;; val it : (int*int)[] = [|(0, 0); (1, 1); (2, 4); (3, 9); (4, 16); (5, 25)|] You can also use a convenient syntax for extracting subarrays from existing arrays; this is called slice notation. A slice expression for a single-dimensional array has the form arr.[start..finish] where one of start and finish may optionally be omitted, and index zero or the index of the last element of the array is assumed instead. For example: > let arr = [| for i in 0 .. 5 -> (i,i*i) |] val arr : (int*int)[] > arr;; val it : (int*int)[] = [|(0, 0); (1, 1); (2, 4); (3, 9); (4, 16); (5, 25)|] > arr.[1..3];; val it : (int*int)[] = [| (1, 1); (2, 4); (3, 9); |] > arr.[..2];; val it : (int*int)[] = [| (0, 0); (1, 1); (2, 4); |] > arr.[3..];; val it : (int*int)[] = [| (3, 9); (4, 16); (5, 25) |] We use slicing syntax extensively in the example Verifying Circuits with Propositional Logic in 12. You can also use slicing syntax with strings and several other F# types such as vectors and matrices, and the operator can be overloaded to work with your own type definitions. The F# library definitions of vectors and matrices can be used as a guide.

A result set is said to be able to detect the database changes if it is aware that a particular row contains a new value since the result set was first populated. However, Oracle result sets cannot detect any operation (insert, update, or delete). Hence the following methods in the JDBC 2.0 would always return false in the case of an Oracle JDBC implementation (as of 10g Release 1): boolean rowDeleted() throws SQLException boolean rowInserted() throws SQLException boolean rowUpdated()throws SQLException

Note Slices on arrays generate fresh arrays. Sometimes it can be more efficient to use other techniques,