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To save the table as a web page, follow these steps: 1. Select the table, then choose File Save as Web Page from the menu to open the Save As dialog box. 2. Choose the Selection option to save only the selected table. 3. Enter a file name (SalesTargetsTable). 4. Click the Publish button to open the Publish as Web Page dialog box (see Figure 7-17).

Interfacing, systems integration, or whatever you want to call it, is just data processing. It is commonly a multistep data process (MSDP) that follows a fairly standard set of tasks: 1. Log that you are going to attempt to download data from a source to your target system. 2. Download data from the source to your target system. 3. Log that you downloaded the data successfully. 4. Verify that you have cross-reference values for all mapped fields. 5. Upload data from its staging tables to its target tables. 6. Log that you uploaded the data successfully. As you can see, interfacing consists of two high-level steps: downloading and uploading (for lack of better terms). Figure 10-7 shows a visual representation of this division of tasks. These steps can be accomplished synchronously or asynchronously. Regardless, I like to separate the major steps by recording their success or failure in a status table. This allows me to rerun the process, as needed, until both steps are completed.

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$card = new SecureCard(); $encrypted = $card->EncryptedData; Because there s no member named EncryptedData in the SecureCard class, the __get function is called. In __get, you can check which property is accessed, and you can include code that returns the value for that property. This technique is particularly useful when you want to define virtual members of the class whose values need to be calculated on the spot, as an alternative to using get functions, such as getEncryptedData(). In our case, the __get function handles eight virtual members. The first is EncryptedData, whose value is returned only if _mIsEncrypted is true: public function __get($name) { if ($name == 'EncryptedData') { if ($this->_mIsEncrypted) return $this->_mEncryptedData; else throw new Exception('Data not encrypted'); } Then there s CardNumberX, which needs to return a version of the card number where all digits are obfuscated (replaced with X ) except the last four. This is handy when showing a user existing details and is becoming standard practice because it lets customers know what card they have stored without exposing the details to prying eyes: elseif ($name == 'CardNumberX') { if ($this->_mIsDecrypted) return 'XXXX-XXXX-XXXX-' . substr($this->_mCardNumber, strlen($this->_mCardNumber) - 4, 4); else throw new Exception('Data not decrypted'); } The last six properties (CardHolder, CardNumber, IssueDate, ExpiryDate, IssueNumber, and CardType) are handled in a single block: elseif (in_array($name, array ('CardHolder', 'CardNumber', 'IssueDate', 'ExpiryDate', 'IssueNumber', 'CardType'))) { $name = '_m' . $name; if ($this->_mIsDecrypted) return $this->$name; else throw new Exception('Data not decrypted'); } else {

Whether or not I use a program external to the database to move data from a source to destination staging tables, the download program can record when it starts its processing and when it completes. Then when the upload process starts, it can check to see if the download process has been completed. If the download has been completed, the upload process can log when it starts and when it completes. Dividing a long-running process into multiple smaller processes like this not only allows you to do asynchronous processing, but also provides you with a framework to build robust processes that can be rerun over and over again until they finish their processing. For example, if you build an interface with multistep processing that should move data into your database once a week, it can be scheduled to run every day of the week with cron or Scheduled Tasks, and it will just quit if the weekly work has already been completed. Here, I ll discuss commonly used method names for a multistep interface on-demand process. Let s start with process.

throw new Exception('Property ' . $name . ' not found'); } } Note that in all cases, the data is only accessible when _mIsDecrypted is true; otherwise, an exception is thrown. Also, note that the data isn t accessible after encryption the data used to initialize a SecureCard object is only accessible in encrypted form. This is more a use-case decision than anything else because this class is only really intended for encryption and decryption, not for persistently representing credit card details. After a SecureCard instance has been used to encrypt card details, we shouldn t subsequently need access to the unencrypted data, only the encrypted string.

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