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Executing a paged query is just as simple as executing a normal query, but you must specify an ORDER BY clause, the number of items to display on a page, and which page of data you want the query to return. Listing 8-17 provides an example outlining the differences. Listing 8-17. Executing a Paged Query Imports System.Data.SqlClient ... '******************************************************************************* Private Sub RunQuery(ByVal currentPage as Integer, ByVal itemsPerPage as Integer) Dim SqlQueryObj As New Reporting.SqlQuery Dim dbConn As New SqlConnection( _ ConnectionStrings("Northwind").ConnectionString)

Log4j supports location information for a logging request. The log4j API tries to detect the exact line number of the code from which the logging request was issued.

Dim dbCmd As SqlCommand Dim dr As SqlDataReader 'Build SQL Query (SELECT * FROM CUSTOMERS) SqlQueryObj.From = "Customers" SqlQueryObj.OrderBy.Add("CustomerID") 'Execute the query dbConn.Open() dbCmd = New SqlCommand( _ SqlQueryObj.GetPagedQuery(currentPage, itemsPerPage), dbConn) dr = dbCmd.ExecuteReader() 'Do what you need to with the data reader ' ... Code ... dr.Close() dbConn.Close() End Sub These examples have given you a good demonstration of the basic usage of the SqlQuery class. You can use it to create as simple or as complex of a query as you desire, and it s especially handy when working with the ORDER BY and WHERE clauses, and for paging data. In the next chapter, you ll learn a lot more about the paging features of the SqlQuery class and how to use the count query to display detailed paging information like the total number of records returned and the overall page count. In this next section, you ll see how easy it is to build out common search clauses using the SqlConditionGroup object.

Next, the script defines the locations of the basic libraries used in the compilation step. The following are the most important: C runtime (LIBC): This is the location of the C runtime header files, located under $SYS_DEV/bionic/libc. Math library (LIBM): This is a commonly used library. It contains system functions such as pow, trigonometric functions, and others. It is located under ${SYS_DEV}/bionic/libm. Kernel headers (KERNEL): Kernel headers are likely to be used by your games, especially high-performance 3D games. It is located under ${SYS_DEV}/kernel. GNU Gzip (LIBZ): If your game manipulates zip files, you ll need this library. It is located under ${SYS_DEV}/external/zlib. XML parser (EXPAT): Most of today s modern games use XML files to store game and configuration information. Thus, this library is required. By default, it is located under ${SYS_DEV}/external/expat/lib.

As you work with search and query features, you may find yourself building out the same WHERE clauses over and over again. The most common ones are usually date range and keyword searches, both of which are fairly generic. You may also have less-generic ones that align themselves more with your core business. For instance, you may repetitively use certain customer, product, category, or other clauses that are more tightly linked to your company s business processes. If you continually use it over and over again, then you might as well make it easier to use over the long haul by creating a commonly used search function. There are two options for building out commonly used search functions. If the search function is fairly generic and thus can be reused on almost every one of your projects, then you can add the function directly to the SqlConditionGroup class. Adding the function in this location makes it easy to call the function from a logical place when you are using a SqlQuery object. sqlQueryObj.SelectFields.Add("OrderID") sqlQueryObj.SelectFields.Add("OrderDate") sqlQueryObj.From = "Order" sqlQueryObj.Where.CreateDateRange("1/1/2004", "1/1/2005", "Order Date", _ Exclusive, "MM/dd/yyyy")

Notice that the CreateDateRange function can be called from the Where property of the SqlQuery object because it resides in the SqlConditionGroup class. This makes your code fairly easy to read. The other option is to create a function in a separate library, and pass the function a reference to a SqlQuery object. Then you can manipulate the SqlQuery object accordingly inside the function. This option is useful when you have a function that will be common in a single project but not necessarily in all your projects. sqlQueryObj.SelectFields.Add("OrderID") sqlQueryObj.SelectFields.Add("OrderDate") sqlQueryObj.From = "Order" ProjectLibrary.CustomSearchQuery(sqlQueryObj,Param1,Param2) This approach helps keep your SqlConditionGroup class from becoming cluttered with code that cannot be ported from one project to the next. Because both the CreateDateRange and CreateKeyword functions are generic, they will be placed in the SqlConditionGroup class. You can see their function definitions and location in the class by looking near the end of Listing 8-6 earlier in this chapter.

Best Practice Determining location information is costly. It is best to avoid this in application logging, if