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In the previous chapters, you saw that when you executed save() on the Todo instance, GORM would only persist the data if the validations (set in the constraints) passed for the domain. The save() would return a true or false depending on if persisting was successful or not. Now the real question is, How do you know what to validate Constraints are somewhat of a dual-use item. Their main functionality is to validate items before they re persisted to the database, but they also can adjust some of the settings on the database itself for the column. For example, if you mark a column in your constraints as nullable or set a maximum length, then these changes will be reflected at the database level as well. Out of the box, GORM comes with quite a few validations, and it even provides the framework for creating a few custom validations of your own. For the purpose of the sample application, you only need a small subset of those validations, so while we will list all of them here, you ll only use a few. In addition, just like any application, it would be impossible for all the built-in validations to cover every situation, so we ll also introduce the idea of custom validations. We will then close with a discussion about how to change the messages to something a bit more meaningful.

&& printf "%s\n" "total=$fp_tot"

You ve already seen constraints in 4. These were used to determine whether some properties had to be filled in on the domain object, and also to set the order of display when scaffolding the domain. Let s expand a bit and look at what other features you can use constraints for. You have seen the nullable constraint, which not only verifies that the object is not null, but also sets the database property to not null (in Figure 6-2, you can see many properties are set to not null ). Of course, this assumes you re using GORM to create or update your database. Let s start with the familiar Todo object, since this is the object you re going to want to apply the most validations to. Start with the basic skeleton shown in Listing 6-19.

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System.Windows.Controls.Navigation namespaces. These namespaces are located in the System. Windows.Controls.Navigation assembly (this is automatically added as a reference in new Silverlight 3 applications and also is added as part of the project upgrade process in Visual Studio 2008).

01 class Todo { 02 ... 03 static constraints = { 04 owner(nullable:false) 05 name(blank:false) 06 } 07 }

## pad the result with leading zeroes if necessary while [ ${#fp_tot} -lt ${#fp_places} ] do fp_tot=0$fp_tot done fp_df= while [ ${#fp_df} -lt ${#fp_places} ] do left=${fp_tot% } fp_df=${fp_tot#$left}$fp_df fp_tot=$left done _FPMUL=$fp_tot${fp_df:+.$fp_df} ## remove trailing zeroes or decimal points while : do case $_FPMUL in *.*[0\ ]|*.) _FPMUL=${_FPMUL% } ;; .*) _FPMUL=0$_FPMUL ;; *) break ;; esac done } fpmul() { _fpmul "$@" || return 1 printf "%s\n" "$_FPMUL" }

The Frame class is responsible for displaying the page (actually any user control, because the Page class inherits from UserControl) that is the target of the navigation. Tables 3-40, 3-41, and 3-42 show the properties, methods, and events of the Frame class.

In line 3, static constraints = { starts the constraint area. This line makes sense when you think about it. Constraints are static because they span multiple instances. The next two lines define two of constraints for you. Line 4 tells you that the owner cannot be nullable; however, it could be a blank string. Line 5 not only doesn t allow for nulls, but it also doesn t allow the name to be blank.

The fpmul function could be improved in various ways: Using a variable for the decimal point would allow the script to be adjusted for use in locales where a comma (or other character) is used instead of a period. Instead of failing, the function could call awk or bc when there is an overflow. The arguments could be checked for invalid numbers. Floating-point arithmetic is built into ksh93, so fpmul is unnecessary in such scripts. This alternative provides a KornShell drop-in function that is compatible with all scripts that use fpmul.

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