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Note When using the DisableWhenClean property, pay close attention to the Data Source Update mode for each individual entry control (TextBox, CheckBox, and so on). The default setting of OnValidation in combination with a True setting on the property causes the button to remain disabled until you tab out of the changed text field, which may not be a desired behavior. Alternatively, changing the mode to OnPropertyChanged produces a nice instant enabling effect on the button, but it also updates your BindingSource on every key press, thus setting your object s property on every key press and possibly running validation rules on every key press. This also may not be a desired behavior, depending on the weight of your business rules.

two instances of episodes. The two episodes instances are related to each other by an inequality condition to ensure that they are in different seasons. You can alias column names and expressions in the same way. The general alias syntax in SQLite is the same in all cases. Select base-name [[as] alias] The as keyword is optional, but many people prefer it because it makes the aliasing more legible, and it makes you less likely to confuse an alias with a base column name or expression.

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The CslaActionExtender control can keep track of almost everything having to do with your business object(s) except for how to create a new one. You determine how to create a new object when you write a factory method that makes a call to DataPortal.Create. For this reason, if you configure one of your buttons with a Save value on the ActionType property and an AddNew value on the PostSaveAction property, you must trap the SetForNew event of the extender component. It is here where you need to reset your business object variable to a new instance and call your rebind method. This rebind method sets the BindingSource component s DataSource property, calls the ResetControlAuthorization() method on any ReadWriteAuthorization components you may be using, and calls ResetActionBehaviors on any CslaActionExtender components. Table 10-6 lists other events of CslaActionExtender.

Subqueries are select statements within select statements. They are also called subselects. Subqueries are useful in many ways, they work anywhere normal expressions work, and they can therefore be used in a variety of places in a select statement. Subqueries are useful in other commands as well. Perhaps the most common use of subqueries is in the where clause, specifically using the in operator. The in operator is a binary operator that takes an input value and a list of values and returns true if the input value exists in the list, or false otherwise. Here s an example: sqlite> 1 sqlite> 0 sqlite> ...> ...> 62 select 1 in (1,2,3); select 2 in (3,4,5); select count(*) from foods where type_id in (1,2);

Summary

Raised when an attempt is made to save an invalid object. Remember that the validity check on the root object reads into all underlying child objects in the object graph. Also remember that information and warning rules do not invalidate an object. Raised immediately upon clicking the button, before any action takes place. The event allows the cancellation of any functionality that may follow. Raised at the very end of the determined action for the button.

Table 10-6. Events Raised by CslaActionExtender (Continued)

Using a subquery, you can rewrite the last statement in terms of names from the food_types: sqlite> select count(*) ...> from foods ...> where type_id in ...> (select id ...> from food_types ...> where name='Bakery' or name='Cereal'); 62 Subqueries in the select clause can be used to add additional data from other tables to the result set. For example, to get the number of episodes each food appears in, the actual count from foods_episodes can be performed in a subquery in the select clause: sqlite> select name, (select count(id) from foods_episodes where food_id=f.id) count from foods f order by count desc limit 10; name ---------Hot Dog Pizza Ketchup count ---------5 4 4

Raised when an exception is encountered while CslaActionExtender is executing some behavior. Raised when an attempt is made to save the object, and the object has one or more broken validation rules of any rule severity. Raised after a successful validity check but before the object gets saved, allowing you to test for nonfatal rules and also for any broken rules down the object graph. Raised immediately after a successful save operation.

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