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The syntax to perform the same type of late binding in C# is slightly more complicated. C# doesn t allow us to call undefined methods on the System.Object type the way VB.NET does. If we tried this in C#, our code wouldn t compile. Here is the equivalent code implemented in C#:

In the following simple example, a query on TABLEA uses a nested subquery to include a runtime output column named DESCRIPTION derived from COLX in TABLEB:

SELECT COL1, COL2, COL3, (SELECT COLA FROM TABLEB WHERE COLX='Espagnol') AS DESCRIPTION FROM TABLEA WHERE ... ;

if (login("test","test")){ //And output our sessions with the greatest of ease. echo "Successfully logged in with user: " . $_SESSION['user'] . " and pass: " . $_SESSION['pass']; } else { echo "Could not login."; } //Now, you logout. logout(); //And hence cannot use our sessions anymore. if (isset ($_SESSION['user'])){ echo $_SESSION['user']; //Outputs nothing. } >

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Notice the use of the keyword AS to mark the identifier (DESCRIPTION) of the derived column. It is optional, but recommended for code clarity. It is very common for an embedded query to be correlated to the main query. A correlated subquery is one whose WHERE clause is linked to one or more values in the outer query s output list or other values in the underlying tables of the outer query. A correlated subquery is similar in effect to an inner join and can sometimes be used to good effect in place of a join. The topic of subqueries is discussed in detail in the following two chapters, but especially in 22.

Reading and writing to tables are database privileges, controlled by declarations made with GRANT and REVOKE. For information, refer to 35.

//Retrieve the Type for the COM object Type comType = Type.GetTypeFromProgID( "DniComRefactorVB.DniComRefactorVBObj"); //create an instance of the COM object Object comObj = Activator.CreateInstance(comType); //execute the first COM method Int32 acctId = (Int32)comType.InvokeMember( "SearchForAccount", BindingFlags.InvokeMethod, null, comObj, new Object[] { "accountKey" }); Decimal pastDueAmt = 0; if (acctId > 0) { //execute the second COM method pastDueAmt = (Decimal)comType.InvokeMember( "GetPastDueBalance", BindingFlags.InvokeMethod, null, comObj, new Object[] { acctId }); if (pastDueAmt > 100m) { //execute the third comType.InvokeMember( "SetAccountDelinquent", BindingFlags.InvokeMethod, null, comObj, new Object[] { acctId }); } } Console.WriteLine("Acct Id:{0}, PastDueAmt:{1}", acctId, pastDueAmt); Console.WriteLine("Press any key to exit"); Console.Read(); The C# code starts out the same way as the VB.NET code. We retrieve a Type object for the COM object, and then we pass that type to Activator.CreateInstance to create an instance of the COM object. From this point forward, the code differs. To call a method in C#, we need to use the InvokeMember method on the Type object that we retrieved. There are a number of overloaded versions of this method. To use the one we chose, we pass the method name, a BindingFlags value, the COM object we created, and an array of parameters. We need to cast the return value to the type we expect since InvokeMember returns only a System.Object. When we execute this code, the results look the same as the VB.NET example: Acct Id:1001, PastDueAmt:123.45 Press any key to exit

The SELECT statement is the fundamental method for clients to retrieve sets of data from the database. It has the following general form:

The code works quite simply. You create a session state using the session_start() function and then use and access these session values using the $_SESSION superglobal. Using the superglobal, you can then add to, remove, or modify the session values. You can use the sessions anywhere the session state is enabled, which means the session_start() function needs to be called at the beginning of every page where you want session access. When you have finished with the sessions, you can simply use the unset() function on the session values and finish off the session state using the session_destroy() function. The prototypes for these session-related functions are as follows: bool session_start ( void ) bool session_destroy ( void )

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