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Web applications: Web applications are applications built with ASP NET These applications have a server-side component and a client-side component The server-side contains the business logic, and the client-side contains the view (GUI) that is displayed in a browser Web applications are accessed via a uniform resource locator (URL) for example, http://wwwsayedhashimicom Web services: Web services are standards-based systems accessible over a network such as the Internet Web services are generally employed to connect disparate systems Web services are sometimes called XML Web Services Smart device applications: Smart device applications are applications that target mobile devices (for example, Smartphone devices) Smart device applications are built with the NET Compact Framework, a subset of the NET Framework Windows services: Windows services are executables that run in the background The special feature of Windows services is that they don t require an interactive user.

We know the value of that theory; we know the benefits that accrue if we follow that theory We also know there are costs associated with not following that theory (we might not know exactly what those costs are I mean, it might be hard to quantify them but we do know there are going to be costs) If you re on an airplane, you d like to be sure that plane has been constructed according to the principles of physics If you re in a high-rise building, you d like to be sure that building has been constructed according to architectural principles In the same kind of way, if I m using a DBMS, I d like to be sure it s been constructed according to database principles If it hasn t, then I know things will go wrong.

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I might find it hard to say exactly what will go wrong, and I might find it hard to say whether things will go wrong in a major or minor way, but I know it s guaranteed that things will go wrong..

Now (at last!) to the multiple assignment version of SET. The syntax has the following general form: SET ( target-commalist ) = row-expression ; Note carefully that the right side here consists of a single (row-valued) expression, not a commalist of separate expressions. The ith field value within the row denoted by that expression is assigned to the ith target. More precisely, let the row denoted by the expression on the right side be ROW ( S1, S2, ..., Sn ) and let the target commalist on the left side be T1, T2, ..., Tn The overall assignment then reduces to something like Dijkstra s concurrent assignment (see the body of the chapter): SET ( T1, T2, ..., Tn ) = [ ROW ] ( S1, S2, ..., Sn ) ; (However, the SQL operator differs from Dijkstra s in that the targets don t all have to be distinct.) The semantics are as indicated by the following compound statement (pseudocode):19 BEGIN DECLARE TEMP ROW SET TEMP = ROW ( SET T1 = TEMP.F1 SET T2 = TEMP.F2 ......... SET Tn = TEMP.Fn END ; ( F1 ..., F2 ..., ..., Fn ... ) ; S1, S2, ..., Sn ) ; ; ; ;

In my very first class there, the professor told me I needed to write out my solutions; I needed to write out the word two instead of using the numerical 2 And I could not just use =; I had to write equals It was a painful adjustment for me, but it served me well By that time in my life, I had learned that the path less traveled usually led me to a better place than I would have imagined While in graduate school, I had the option of composing a master s project as part of earning my degree Since knowing how doing extra work had always paid off for me in the past, I decided to take on a project.

We ll give some examples involving pseudovariables in just a moment (examples not involving pseudovariables are essentially trivial and are left as an exercise for the reader). Now, the foregoing definition in terms of a single compound statement does ensure that all source expressions are evaluated before any assignment takes place; curiously, however, it fails to ensure that the compound statement in question is atomic even though all that would be needed to make it so would be to add the keyword ATOMIC immediately following the keyword BEGIN.20 What makes the situation even odder is that there s a workaround that not only evaluates all source expressions first but guarantees atomicity as well. For example, the statement SET ( U, V ) = ROW ( 1, 2 ) ; is not atomic, but the following one, which has more or less the same effect, is:

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