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After executing the code in Listing 4-20, what happened from a query perspective is troubling and also exemplifies the reason that I warned you earlier in the chapter to always monitor the chattiness of LTS (or any ORM) with SQL Profiler before releasing to production Listing 4-21 has two queries The first query is the retrieval of the Contact entity, which looks fine The second query is the problem: it was executed approximately 20 thousand times, with a different EmployeeID parameter (for example, 629) each time, to retrieve the Employee and EmployeeDepartmentHistory entities Obviously, this has the potential to bring down your servers and therefore is a major problem Listing 4-21 Multiple 1:n Queries in LTS SELECT [t0][ContactID], [t0][NameStyle], [t0][Title], [t0][FirstName], [t0][MiddleName], [t0][LastName], [t0][Suffix], [t0][EmailAddress],[t0][EmailPromotion], [t0][Phone], [t0][PasswordHash], [t0][PasswordSalt], [t0][AdditionalContactInfo], [t0][rowguid], [t0][ModifiedDate] FROM [Person].

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Here we created a new div element and attached a click event handler to it. Instead of separating the calls to addEvents, we simply included an events object in the properties argument to the Element constructor. This gives us a very handy way to attach event handlers to new elements. Like its counterpart from the native event models, the MooTools addEvent method allows event handlers to be attached only once. var handler = function(){ console.log('Clicked.'); }; var item = $('item'); item.addEvent('click', handler); item.addEvent('click', handler); item.addEvent('click', handler); In this snippet, we tried attaching the handler function as a click event handler to the item element three times. Like in the native event models, though, the handler function will only be attached once in order to prevent us from accidentally attaching the function more than once. One tricky part is the dispatch order of event handlers. We learned that in the IE model, event handlers are invoked randomly, while in the standard model, they are invoked according to the order they were added. The MooTools event system, being built on top of these two native models, inherits the dispatch order of whatever model the current browser uses. var handlerA = function(){ console.log('Handler A.'); }; var handlerB = function(){ console.log('Handler B.'); }; var item = $('item'); item.addEvent('click', handlerA); item.addEvent('click', handlerB); If we run this snippet on a browser that uses the standard model, we re guaranteed that handlerA will always be called first before handlerB. But if we run this on IE, we ll also get the same behavior as the IE model where event handlers are invoked randomly. This is because, as we ll see later on, MooTools uses both models internally in its implementation of an event system.

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[Contact] AS [t0] exec sp_executesql N'SELECT [t0][EmployeeID], [t0][NationalIDNumber], [t0][ContactID], [t0][LoginID], [t0][ManagerID], [t0][Title], [t0][BirthDate],[t0][MaritalStatus], [t0][Gender], [t0][HireDate], [t0][SalariedFlag], [t0][VacationHours], [t0][SickLeaveHours], [t0][CurrentFlag], [t0][rowguid],[t0][ModifiedDate], [t1][EmployeeID] AS [EmployeeID2], [t1][DepartmentID], [t1][ShiftID], [t1][StartDate], [t1][EndDate], [t1][ModifiedDate] AS [ModifiedDate2], ( SELECT COUNT(*) FROM [HumanResources][EmployeeDepartmentHistory] AS [t2] WHERE [t2][EmployeeID] = [t0][EmployeeID] ) AS [count] FROM [HumanResources][Employee] AS [t0] LEFT OUTER JOIN [HumanResources][EmployeeDepartmentHistory] AS [t1] ON [t1][EmployeeID] = [t0][EmployeeID] WHERE [t0][ContactID] = @x1 ORDER BY [t0][EmployeeID], [t1][DepartmentID], [t1][ShiftID], [t1][StartDate]',N'@x1 int',@x1=629 Why does LTS turn this relationship, which could be defined with a couple of SQL JOINs, into something so horrendous According to Scott Guthrie (http://weblogsaspnet/ scottgu/archive/2007/08/23/linq-to-sql-part-7-updating-our-database-using-storedproceduresaspx#3599383), this is by design to prevent data explosions happening with 1:n relationships.

Remember this example <a href="home.html">Home</a> <a href="about.html">About</a> <a href="projects.html">Projects</a> We have a set of links that point to different pages and we wanted to stop the browser from doing the default click action, which is to load the page referenced by the href attribute of the links. In the IE model, we used window.event.returnValue = false to do this, while we used the preventDefault method of the event object in the standard model. MooTools takes its inspiration from the standard model, and provides its own preventDefault method for its event object:

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To say it another way, LTS supports only first-level JOINs in 1:n relationships For example, if you comment out optionsLoadWith<Employee>(emdh => emdh EmployeeDepartmentHistories) in Listing 4-20 and run the query again, you end up with a single query, as seen in Listing 4-22 In Listing 4-22, you have a concise JOIN between your Contact and Employee tables that will populate both entities in your model..

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