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# Prepare the statment my $sth = $dbh->prepare("select name from foods limit 3"); # Execute $sth->execute; # Print a human-readable header print "\nArray:\n\n"; # Iterate over results and print while($row = $sth->fetchrow_arrayref) { print @$row[0] . "\n"; } # Do the same thing, this time using hashref print "\nHash:\n\n"; $sth->execute; while($row = $sth->fetchrow_hashref) { print @$row{'name'} . "\n"; } # Finalize the statement $sth->finish; #Disconnect $dbh->disconnect; Internally, the prepare() method corresponds to the sqlite3_prepare_v2() method. Similarly, execute() calls the first sqlite3_step() method. It automatically figures out whether there is data to be returned. If there is no data (for example, non-select statements), it automatically finalizes the query. The fetchrow_array(), fetchrow_hashref(), and fetch() methods call sqlite3_step() as well, returning a single row in the result set until the results are exhausted. Additionally, you can run non-select statements in one step using the database object s do() method. Listing 8-2 illustrates this using an in-memory database. Listing 8-2. The do() Method use DBI; my $dbh = DBI->connect("dbi:SQLite:dbname=:memory:", "", "", { RaiseError => 1 }); $dbh->do("create table cast (name)"); $dbh->do("insert into cast values ('Elaine')"); $dbh->do("insert into cast values ('Jerry')"); $dbh->do("insert into cast values ('Kramer')"); $dbh->do("insert into cast values ('George')"); $dbh->do("insert into cast values ('Newman')"); my $sth = $dbh->prepare("select * from cast"); $sth->execute;

Of the three UI technologies discussed in this chapter, ASP.NET Web Forms has the fewest requirements on business objects. In fact, it imposes no specific requirements on your objects or collections at all. Any object with properties can be bound to controls in a page. Any collection, list, or array that implements IEnumerable (the most basic of all collection interfaces) can be bound to list controls on a page. In short, it just works.

while($row = $sth->fetch) { print join(", ", @$row), "\n"; } $sth->finish; $dbh->disconnect; The statement handle object s finish() method will call sqlite3_finalize() on the query object, if it has not already done so. This program produces the following output: Elaine Jerry Kramer George Newman

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However, there s one catch, and that is the way the Web Forms data source controls work specifically, the ObjectDataSource control. This control imposes some restrictions on the objects it works with, and those restrictions mean it won t work with CSLA .NET objects.

Listing 9-3 illustrates a portion of the StockTrader Web service WSDL file, showing the <portType> and <message> definitions related to the PlaceTrade Web method Listing 9-3 Excerpt from the StockTrader Web Service WSDL File Showing the <portType> and <message> Definitions <portType name="StockTraderServiceSoap"> <operation name="PlaceTrade"> <input message="tns:PlaceTradeSoapIn" /> <output message="tns:PlaceTradeSoapOut" /> </operation> </portType>.

Parameter binding follows the method defined in the DBI specification. Although SQLite supports both positional and named parameters, the Perl interface uses only positional parameters, demonstrated in Listing 8-3. Listing 8-3. Parameter Binding in Perl use DBI; my $dbh = DBI->connect( "dbi:SQLite:dbname=foods.db", "", "", { RaiseError => 1 }); my $sth = $dbh->prepare("select * from foods where name like :1"); $sth->execute('C%'); while($row = $sth->fetchrow_hashref) { print @$row{'name'} . "\n"; } $sth->finish; $dbh->disconnect; The execute() method takes the parameter values defined in prepare(). Running this against the evolving foods database we ve used for many of our examples returns 73 rows (depending on how much fun you had playing with chocolate bobka in previous chapters).

To overcome this limitation, the CslaDataSource control is an ASP.NET data source control that is designed to work with objects containing business logic. This control allows the full use of Web Forms data binding with rich business objects.

Data source controls in ASP.NET have two major areas of functionality: runtime and design time. Runtime functionality is the actual data binding implementation it copies data from the data source to the controls and back again. Design time functionality exists to support Visual Studio 2005 and 2008, allowing developers to graphically create web pages using common controls such as DataGridView and DetailsView when they are bound to the data source control. The detailed design issues around building an ASP.NET data source control are beyond the scope of this book. Nonetheless, I ll walk quickly through the code in these classes to call out the highlights of the implementation. It turns out that implementing runtime functionality is relatively straightforward, but providing design time functionality is more complex. Table 10-7 lists the classes required to implement the CslaDataSource control s runtime and design time support.

You could safely assume that this would work properly for these examples, but it would not be a good idea to make this assumption in a program.

CHAPTER 9 BEYOND WSE 3.0: LOOKING AHEAD TO WINDOWS COMMUNICATION FOUNDATION (WCF)

CslaDataSource CslaDataSourceView CslaDataSourceConfiguration CslaDataSourceDesigner CslaDesignerDataSourceView ObjectSchema ObjectViewSchema

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