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Console.WriteLine( "Elapsed time for thread: {0}ms", sw.ElapsedMilliseconds); } } This wrapper represents one execution thread (a client). Once we start the thread, the ThreadProc loops 100 times, creating an object instance and calling the LookupKeyCode each time through the loop. After the loop completes, we display the elapsed time for the test. The code to use this test wrapper looks like this: static void Main(string[] args) { const int NumberOfThreads = 10; //create multiple test objects, each with //its own thread that calls the test method ObjectPoolingTest[] testObjs = new ObjectPoolingTest[NumberOfThreads]; for (int i = 0; i < NumberOfThreads; i++) { testObjs[i] = new ObjectPoolingTest(); } //start all tests for (int i = 0; i < NumberOfThreads; i++) { testObjs[i].Test(); } Console.Read(); } After creating 10 instances of the ObjectPoolingTest wrapper, we start all execution threads. At this point, we have 10 virtual clients running, each one repeatedly creating an object and calling the test method 100 times. When the code is executed, we see these results: Elapsed Elapsed Elapsed Elapsed Elapsed Elapsed Elapsed Elapsed Elapsed Elapsed time time time time time time time time time time for for for for for for for for for for thread: thread: thread: thread: thread: thread: thread: thread: thread: thread: 2248ms 2284ms 2290ms 2357ms 2343ms 2388ms 2390ms 2366ms 2373ms 2400ms

You can also use constants in the calculation of variable variables. You need to use a different modifier, because a $ sign in front of a constant would look like a variable. By putting {} around the constant name and then applying the $ sign in front of it, you will create a reference to a variable with the name of the constant s value.

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Dependencies must be removed before the column drop can proceed. Columns involved in PRIMARY KEY and UNIQUE constraints cannot be dropped if they are referenced by FOREIGN KEY constraints. In this event, drop the FOREIGN KEY constraint before dropping the PRIMARY KEY or UNIQUE key constraint and column it references. Finally, you can drop the column. This is the syntax:

ALTER TABLE name DROP colname [, colname ...];

< php // Example 10-7-3.php define('CONST_A', 'test'); ${CONST_A} = 27; echo "\$test = $test\n"; >

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For example, the following statement drops the column JOB_GRADE from the EMPLOYEE table:

This shows that the elapsed time for all of the threads to finish is about 2.4 seconds. Obviously, your elapsed time may be different due to your machine specifications. To see the difference that object pooling makes, we can make a small change to our code and run the test again. Simply comment out (or remove) the ObjectPooling attribute like this: // [ObjectPooling(30,100)] Before running the test again, we need to rebuild the DniScObjectPooling project. We also need to make sure we shut down the COM+ application named DniServerApplication, which we can do using the Component Services Management Console plug-in. Now when we run the test again without object pooling, we see these results: Elapsed Elapsed Elapsed Elapsed Elapsed Elapsed Elapsed Elapsed Elapsed Elapsed time time time time time time time time time time for for for for for for for for for for thread: thread: thread: thread: thread: thread: thread: thread: thread: thread: 10360ms 10402ms 10384ms 10424ms 10433ms 10450ms 10498ms 10517ms 10539ms 10558ms

ALTER TABLE EMPLOYEE DROP JOB_GRADE;

To drop several columns with a single statement:

First you define a variable with the value test, and then you use that constant to calculate a new variable name and assign that variable the value of 27. To avoid creating a new variable called $CONST_A, you use the extended notation ${CONST_A} to tell the engine to use the constant. $test = 27 It is also possible to use the value of a variable to point to a function name and thereby change the program flow without needing flow control. This might not always make the code readable, but it makes it possible to create code where the flow control can be moved to a database in the form of parameters.

ALTER TABLE EMPLOYEE DROP JOB_GRADE, DROP FULL_NAME;

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