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The error plug-in captures any exceptions that are thrown by your application. This includes the exceptions that occur when a controller or action is not found as well as any exceptions that occur in your action controllers. These exceptions relate to 404 and 500 errors. Once the error plug-in encounters an exception, it redirects the request to ErrorController s errorAction() in the default module. At that point, it hands the control over to you, which enables you to determine how much information to give the user about the issue and how to present it. The Zend Tool Framework creates the ErrorController class (Listing 1-10) and its associated view (Listing 1-11) for you. The error controller s errorAction() fetches the error handler and evaluates which type of error occurred. Then it sets the response code and sets the error message. It also passes the exception and the request object to the view, so the view has all the information required to display a complete error report. Listing 1-10. The ErrorController in application/controllers/ErrorController.php < php class ErrorController extends Zend_Controller_Action { public function errorAction() { $errors = $this->_getParam('error_handler'); switch ($errors->type) { case Zend_Controller_Plugin_ErrorHandler::EXCEPTION_NO_CONTROLLER: case Zend_Controller_Plugin_ErrorHandler::EXCEPTION_NO_ACTION: // 404 error -- controller or action not found $this->getResponse()->setHttpResponseCode(404); $this->view->message = 'Page not found'; break; default: // application error $this->getResponse()->setHttpResponseCode(500); $this->view->message = 'Application error'; break; } $this->view->exception = $errors->exception; $this->view->request = $errors->request; } } The error view script renders the error message that was set in the error controller. If the current environment is development, it also renders the complete exception, the stack trace, and any request parameters that were set. This makes it easier for you to track down the issue.

lthough it may often seem otherwise, computers are very predictable; they do exactly what they are told (i.e., programmed) to do. Randomness is the antithesis of predictability, and this makes the generation of random number by a computer problematic. There are two general methods used by computers to generate random numbers: hardware and software. A hardware generator may be a dedicated device, noise from device drivers, or some other source. The software method uses a pseudo-random number generator (PRNG), so called because a mathematical formula produces the numbers. The random numbers generated in this chapter use the second method, a PRNG, which is built into either the shell or awk. This generator uses the last number produced to calculate the next one, unless a new seed is given. If you toss a coin 92 times, you don t expect it to come up heads every time, but it would be a perfectly reasonable random sequence, and certainly unpredictable. If you roll a die six times, you don t expect each number to come up exactly once, but the more times you roll, the closer the result should be to an even distribution across all the possible values. The PRNGs in modern shells, as well as that in awk, produce very good random sequences that can be used for all but the most exacting tasks. This chapter presents functions for generating one or more random numbers across a given range, and scripts that take advantage of them.

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To enable transactions for your SSIS package, follow these steps: 1. In the SSIS Designer, right-click an empty area on the Control Flow design surface and select Properties. 2. In the Properties window, change the TransactionOption property to Required. The Required option means that the SSIS will start a transaction. The Supported option does not actually start a transaction; rather, it joins any transaction already started by the package or its parent container. 3. To enlist a specific task or container within the package transaction, click the task on the Control Flow design surface. In the Properties window, change the task s TransactionOption property to Required.

With SSIS, Microsoft provides several debugging and troubleshooting features, including control flow and data flow visual debugging, data viewers, breakpoints, and other debug windows.

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