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} } } Overall, the update example in Listing 3-15 is pretty straightforward, but it does demonstrate the simplicity of basic updates in LTS Nonetheless, for the people who still have doubts about the SQL that is being generated, Listing 3-16 shows the dynamic UPDATE statement that was generated The SQL code in Listing 3-16 is far from perfect In fact, in this case it probably appears a bit excessive when all that is trying to be accomplished is an update to the VacationHours field The real reason behind the large UPDATE statement has to do with the way that optimistic concurrency is handled in LTS This is a large topic, covered in 11 For now, understand that there are many ways in LTS to change the way that the generated code looks and performs, and throughout the text you will be exploring these options and honing your skills.

Although class inheritance is powerful, it comes at a cost: it is relatively inflexible compared with composition, which offers flexibility at minimal cost.

So it s better if we have a single handler function to handle all these items, but we re back to our original problem: how do we know which element was clicked Let s recall how the event loopz works: first, the observer monitors all elements on the page and when something happens, it creates an event object that contains data about the event, which it hands off to the dispatcher, which then invokes the event handler The key, therefore, is the event object, because that s where the observer puts all data about what happened and one of those pieces of data is the element where the event happened In Internet Explorer, there is only one global event object that is accessible via windowevent.

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Composition or containment refers to the practice of a concrete class acquiring functionality from internal instances of other classes; in other words, an object is composed of other objects and leverages their functionality rather than implementing or inheriting it.

The global event object is where the global observer puts the details of the event, and we can read the properties of this object to find out more about the event that we re handling An important property of the global event object is srcElement, which is a reference to the actual element where the event happened We can use this property to pinpoint which element was actually clicked, and we can then edit our code to make use of this property: var handler = function(){ // get the clicked element using windowevent var contact = $(windoweventsrcElement); consolelog('Clicked on ' + contactget('data-id')); }; var contacts = $('contacts')getElements('li'); contactseach(function(contact){ contactattachEvent('onclick', handler); });.

Listing 3-16 UPDATE SQL exec sp_executesql N'UPDATE [HumanResources][Employee] SET [VacationHours] = @p14 WHERE ([EmployeeID] = @p0) AND ([NationalIDNumber] = @p1) AND ([ContactID] = @p2) AND ([LoginID] = @p3) AND ([ManagerID] = @p4) AND ([Title] = @p5) AND ([BirthDate] = @p6) AND ([MaritalStatus] = @p7) AND ([Gender] = @p8) AND ([HireDate] = @p9) AND (NOT ([SalariedFlag] = 1)) AND ([VacationHours] = @p10) AND ([SickLeaveHours] = @p11) AND ([CurrentFlag] = 1) AND ([rowguid] = @p12) AND ([ModifiedDate] = @p13)',N'@p0 int,@p1 nvarchar(9),@p2 int,@p3 nvarchar(20),@p4 int,@p5 nvarchar(20),@p6 datetime,@p7 nchar(1),@p8 nchar(1),@p9 datetime,@p10 smallint,@p11 smallint,@p12 uniqueidentifier,@p13 datetime,@p14 smallint',@p0=4,@p1=N'112457891',@p2=1290,@p3=N'adventureworks\rob0',@p4=3,@p5=N'Senior Tool Designer',@p6=''1965-01-23 00:00:00:000'',@p7=N'S',@p8=N'M',@p9=''1998-01-05 00:00:00:000'',@p10=48,@p11=80, @p12='59747955-87B8-443F-8ED4-F8AD3AFDF3A9',@p13=''2004-07-31 00:00:00:000'',@p14=24 At this point, it is important to understand that dynamic SQL generation buys you something that a stored procedure API doesn t: encapsulation of business logic in the middle tier, where it belongs.

Composition is used where an object requires given functionality and that functionality (in part or in full) is available in another object(s).

We modified our handler function in this example to access the clicked list item using window.event.srcElement. We then output the value of the data-id attribute of the element as in our individual handler example. When we run this in the browser, we ll get properly differentiated output for each of our list items, just as we require.

Composition is cheap! It is easy to reuse existing functionality and relatively easy to alter the functionality of a class by altering the composition of objects. Composition does, however, rely on stability of the implementation and interface of the contained objects. It is favored

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