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Lines 250 through 256 block a call to help() and then test it in a fashion similar to the previous test. Line 258 calls test() for the package, therefore passing only the object s name. Line 259 calls procedure success(). These last two calls will indicate that the test procedure test() itself completed successfully, instead of possibly aborting somewhere in the midst of the test from an unhandled exception. Now that I ve shown you my relational testing tool, it s your turn to create an objectrelational version.

No matter what the SQL query says, we need a way to send it to PostgreSQL. PostgreSQL ships with a simple, text-based interface (named psql ) that permits executing SQL queries and getting back the results. The command-line interface isn t particularly easy to use, but it is functional. However, there are alternatives. Several free, third-party database administration tools allow you to manipulate data structures and execute SQL queries via an easy-to-use graphical interface. In this book, we ll show you how to use pgAdmin III, which is an admin tool that ships together with PostgreSQL. Apart from needing to interact with PostgreSQL with a direct interface to its engine, you also need to learn how to access PostgreSQL programmatically, from PHP code. This requirement is obvious, because the e-commerce web site will need to query the database to retrieve catalog information (departments, categories, products, and so on) when building pages for the visitors. As for querying PostgreSQL databases through PHP code, the tool you ll rely on here is PDO (PHP Data Objects).

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Your assignment is to re-create the testing tool I ve just shown you as an object-relational TYPE instead of a package. There s one twist, though. You can t declare constants, pseudo-constants, or variables in a TYPE, as I did in the TEST_TS package specification, so you ll need to declare additional parameterless functions that return the constant values. To create an object-relational testing tool, follow these steps: 1. Write a DDL script to create a TYPE specification named TEST_O. This type should have an attribute for every column name in table TEST_T. It should also have corresponding methods for each method found in package TEST_TS. In addition, you ll add parameterless functions in the place of the constants in package TEST_TS. Include the method signature for, but skip, coding the methods help() and test(). We ll work on coding test() in the next section, and help() in the next chapter. 2. Save your script as test_o.tps. 3. Compile your script: SQL> @test_o.tps. 4. Write a DDL script to create the object table TEST_OT of TEST_O. 5. Save your script as test_ot.tab. 6. Compile your script: SQL> @test_ot.tab. 7. Write a DDL script to create the TYPE BODY for TEST_O. 8. Save your script as test_o.tpb. 9. Compile your script: SQL> @test_o.tpb. But what about testing your new test tool I ll devote the entire next section to that task. Do you want to see my solution for this exercise Listings 8-5, 8-6, and 8-7 are the DDL for the TYPE specification, table, and body, respectively, for my version of TYPE TEST_O. Listing 8-5. A DDL Script for TYPE TEST_O s Spec, test_o.tps 01 02 03 drop type TEST_O; create type TEST_O as object ( /*

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