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At this point, I ve coded the scripts to create the Gender code object table, and you ve done the same for the Worker Type object table Now you can put these to work as you code the scripts for and create a Worker object table Here s what to do: 1 Verify that you successfully executed the following scripts: gender_otps, gender_otpb, gender_ottab, and gender_otins 2 Verify that you successfully coded and executed the following scripts: worker_type_o tps, worker_type_otpb, worker_type_ottab, and worker_type_otins 3 Write a script to create a TYPE specification for the Worker entity You can get the attributes from the column names in file worker_type_ttab You can get the method names from package file worker_type_tspks 4 Save your script as worker_otps 5 Compile your script: @worker_otps 6.

Write a script to create an object table named WORKER_OT using the user-defined type WORKER_O you just created 7 Save your script as worker_ottab 8 Compile your script: @worker_ottab 9 Write a script to implement the TYPE BODY for the Worker entity You can get the method implementations from package file worker_type_tspkb 10 Save your script as worker_otpb 11 Compile your script: @worker_otps 12 At this point, you should have a valid WORKER_OT object table So now modify the script we used to populate the WORKER_T table, worker_tins, to populate the WORKER_OT object table 13 Save your script as worker_otins 14 Execute your script in order to populate the object table: @worker_otins 15 Create a test unit script and test your new object table Listings 6-10 through 6-13 show my solutions for this exercise.

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The database functions themselves have a standard structure, taking advantage of the fact that PDO has been configured to throw exceptions. Let s take a closer look at the GetRow method. // Wrapper method for PDOStatement::fetch public static function GetRow($statementHandler, $params = null, $fetchStyle = PDO::FETCH_ASSOC) { // Initialize the return value to null $result = null; // Try executing the prepared statement received as parameter try { self::Execute($statementHandler, $params); $result = $statementHandler->fetch($fetchStyle); } catch(PDOException $e) { // Close the database handler and trigger an error self::Close(); trigger_error($e->getMessage(), E_USER_ERROR); } // Return the query results return $result; } This method generates an error (using the trigger_error function) if the database command didn t execute successfully. The error is captured by the error-handling mechanism you implemented in 2. Because of the way you implemented the error-handling code in 2, generating an E_USER_ERROR error freezes the execution of the request, eventually logging and/or emailing the error data, and showing the visitor a nice Please come back later message (if there is such thing as a nice Please come back later message, anyway). Note that before the error is generated, we also close the database connection to ensure that we re not leaving any database resources occupied by the script. By default, if you don t specify to trigger_error the kind of error to generate, an E_USER_NOTICE message is generated, which doesn t interfere with the normal execution of the request (the error is eventually logged, but execution continues normally afterwards). The functionality in the DatabaseHandler class is meant to be used in the other business tier classes, such as Catalog. At this moment, Catalog contains a single method: GetDepartments. // Business tier class for reading product catalog information class Catalog { // Retrieves all departments public static function GetDepartments()

7. Select the columns you want to display and the order in which you want to display them. 8. Select an ascending or descending sort order. You can sort two levels deep. 9. Add any filters to limit the data return to specific criteria. 10. To group the data, identify a column on which to group and, if desired, to subgroup the data. 11. Add totals, including counts, to any columns. 12. Select a style for the list.

Listing 6-10 is my specification for the TYPE WORKER_O Listing 6-10 The Specification Script for User-Defined TYPE WORKER_O, worker_otps 001 002 003 004 create or replace type WORKER_O as object ( /* worker_otps by Donald J Bales on 12/15/2006.

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