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You will see a single seek operation within the clustered index to fetch the anchor row, followed by an ordered scan within the covering index to fetch the next page of rows. That s not a very ef cient plan. Ideally, the optimizer would have performed a seek within the covering index to the rst row from the desired page of orders, then it would have followed with a partial ordered scan to grab the rest of the rows in the desired page of orders, physically accessing only the relevant rows. The reason for getting an inef cient plan is because the lter has an OR operator between the expression O.orderdate > A.orderdate and the expression O.orderdate = A.orderdate AND O.orderid > A.orderid. SQL Server s optimizer tends to produce better plans for predicates that use AND logic instead of OR logic for reasons that I ll describe later in the chapter under the section Logical Transformations. For our GetNextPage procedure, here s the optimized implementation that transforms the OR logic to AND logic:

This code ensures that every call is routed to the same TradingMode object. We ve used several language features here that aren t available in JavaScript, so let s see how we can get around this. Singletons in JavaScript In JavaScript, we don t have built-in support for access modifiers, but we can hide the constructor by not providing one. JavaScript is prototype-based, with constructors being ordinary Function objects (see appendix B if you don t understand what this means). We could write a TradingMode object in the ordinary way:

public class SecurityInterceptor { Marks intercepted invocation @AroundInvoke public Object checkUserRole(InvocationContext context)

This generates the following output:

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' ----- Get the ID of the patron. patronID = (New PatronAccess).SelectPatron( ) If (patronID = -1) Then Return ' ----- Get the patron name. sqlText = "SELECT FirstName + ' ' + LastName FROM Patron " & _ "WHERE ID = " & patronID patronName = CStr(ExecuteSQLReturn(sqlText)) ' ----- Is this patron active sqlText = "SELECT Active FROM Patron WHERE ID = " & patronID If (CBool(ExecuteSQLReturn(sqlText)) = False) Then MsgBox("Patron '" & patronName & _ "' is marked as inactive.", MsgBoxStyle.OkOnly Or _ MsgBoxStyle.Exclamation, ProgramTitle) Return End If

Connect()

The SWS File Format and Symbol Enumeration As you can see from Listing 19-1, the _penter function isn't very exciting Things get more interesting when you start to think about how to organize the address data Since I need to DBGHELPDLL associate an address with a function name, I use my good friend, the symbol engine, somewhere in the program However, looking up symbols in the symbol engine is not the fastest of operations, so I had to find a way to keep the data access small and fast because it will be touched by each function call When I thought about it, what I wanted for the data arrangement was just a sorted array of all the function addresses with their associated execution counts That way, when I had the return address in the _penter function, I could just do a quick binary search for the address.

public Object nullSafeGet(ResultSet resultSet, String[] names, Object owner) throws HibernateException, SQLException { String name = resultSet.getString(names[0]); return resultSet.wasNull() null : Rating.getInstance(name); } public void nullSafeSet(PreparedStatement statement, Object value, int index) throws HibernateException, SQLException { if (value == null) { statement.setNull(index, Types.VARCHAR); } else { statement.setString(index, value.toString()); } } }

orderList is an IEnumerable collection of anonymous types, based on the return value of the select statement.

This solution seemed relatively straightforward because all I had to do was enumerate the modules' symbols and sort the array of functions I had all the necessary data to do this I thought that SWS, like the WST, should keep each module's execution counts for a run in a separate data file I favor that approach because if you don't want a particular application run, you can delete it from the overall merged data set The WST uses the <module name><run number> naming format, but I wanted SWS to use a <module name><run number>SWS scheme so that I could eventually write a graphical program to make combining all the runs easier After I decided how I wanted to approach the run-time data processing, I considered how to generate the actual order file As I already mentioned, I needed to concatenate the individual runs.

public event EventHandler<ProcessEventArgs> Processing; public event EventHandler<ProcessEventArgs> Processed;

However, when I thought about producing the actual order file, I realized 683.

Next, if our query returns more than one entity class, we must define SqlResultSetMapping in the entity class using resultSetMapping as follows:

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