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Listing 12-9 shows the next step of creating the nested table based on the ERRATA_TAB_T type. Just as we did in the previous section with the EMPLOYEES table, we first create a copy C of the COURSES table, to keep that table unimpaired. Listing 12-9. Creating a Table with a Nested Table Column SQL> create table c 2 as 3 select * from courses; Table created. SQL> alter table c 2 add (errata errata_tab_t) 3 nested table errata store as errata_tab; Table altered. SQL> update c 2 set errata = errata_tab_t(); 10 rows updated. SQL>

http://githubcom/gabriel/gh-unit) is an open source alternative to OCUnit and builds off the unit testing part of Google s Mac Toolkit GHUnit is actively developed, and has several lofty goals, mostly filling in the gaps where the built-in tool lacks The most notable, and perhaps useful, goal is: The ability to debug unit tests GHUnit also excels in other areas that OCUnit makes difficult, such as: A stand-alone unit test running app that runs on the simulator and, more importantly, on your devices Being easier to install, correctly, the first time Being easily run from the command line for regularly scheduled testing GHUnit provides a nifty unit testing harness.

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In Listing 12-9, the ALTER TABLE command adds an ERRATA nested table column to the C table, and the UPDATE command assigns an empty nested table to the ERRATA column for every row. Note that we use the ERRATA_TAB_T table type constructor method for that purpose.

Figure 9-15. The first rule of writing a good how to guide is to lay out your materials!

This harness does all the heavy lifting of scanning the compiled test library for subclasses of GHTestCase, reading those subclasses for all the test methods, running them, reporting broken tests all in a helpful user interface that runs both on the iPhone simulator and your devices Let s install GHUnit into a default XCode Project Be sure to download GHUnit from http://githubcom/gabriel/gh-unit/downloads You ll be using version 0412 for iPhone OS 3x for the remainder of this chapter The GHUnit package file will contain several header (h) files and a static library file, in addition to a couple of other contents that will be used to build and run your unit test project One important thing to keep in mind while installing GHUnit is the Configuration into which you are installing.

Now we can add rows to the nested table, as shown in Listing 12-10. Note that you can access nested tables only within the context of the table they are part of; it is impossible to access them as independent tables. Listing 12-10 uses the TABLE function again, just as we did before in Listing 12-6, to unnest the nested table. Listing 12-10. Inserting Rows into the Nested Table SQL> insert into table ( select errata 2 from c 3 where code = 'SQL') 4 values ('SQL' 5 , 3 6 , 45 7 , 'Typo in last line.'); 1 row created. SQL> We inserted an erratum entry for the SQL course, 3, page 45. In a similar way, you can also delete rows from a nested table. As stated in the introduction to this section, nested tables offer more flexibility than arrays. For example, you can update individual column values of a nested table, whereas you can only replace arrays in their entirety. Suppose we made a typo in Listing 12-10 while entering the chapter number: the erratum was not in 3, but rather in 7. Listing 12-11 shows how we can correct this mistake with an UPDATE command. Note that line 3 introduces tuple variable e ranging over the result of the TABLE function, allowing us to use that tuple variable on the fourth line to refer to its chapter (CH) column value. Listing 12-11. Updating Individual Columns of Nested Tables SQL> update table ( select errata 2 from c 3 where code = 'SQL') e 4 set e.ch = 7; 1 row updated. SQL>

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