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For a complete example, let s build a console application (named DataProviderFactory) that prints out the first and last names of individuals in the Authors table of a database named Pubs residing within Microsoft SQL Server (as you may know, Pubs is a sample database modeling a fictitious book publishing company). First, add a reference to the System.Configuration.dll assembly and insert an app.config file to the current project and define an <appSettings> element. Remember that the format of the official provider value is the full namespace name for the data provider, rather than the string name of the ad hoc DataProvider enumeration used in the MyConnectionFactory example: <configuration> <appSettings> <!-- Which provider --> <add key="provider" value="System.Data.SqlClient" /> <!-- Which connection string --> <add key="cnStr" value= "Data Source=localhost;uid=sa;pwd=;Initial Catalog=Pubs"/> </appSettings> </configuration> Now that you have a proper *.config file, you can read in the provider and cnStr values using the ConfigurationManager.AppSettings() method. The provider value will be passed to DbProviderFactories. GetFactory() to obtain the data provider specific factory type. The cnStr value will be used to set the ConnectionString property of the DbConnection-derived type. Assuming you have used the System.Data and System.Data.Common namespaces, update your Main() method as follows: static void Main(string[] args) { Console.WriteLine("***** Fun with Data Provider Factories *****\n"); // Get Connection string/provider from *.config. string dp = ConfigurationManager.AppSettings["provider"]; string cnStr =

ConfigurationManager.AppSettings["cnStr"]; // Make the factory provider. DbProviderFactory df = DbProviderFactories.GetFactory(dp); // Now make connection object. DbConnection cn = df.CreateConnection(); Console.WriteLine("Your connection object is a: {0}", cn.GetType().FullName); cn.ConnectionString = cnStr; cn.Open(); // Make command object. DbCommand cmd = df.CreateCommand(); Console.WriteLine("Your command object is a: {0}", cmd.GetType().FullName); cmd.Connection = cn; cmd.CommandText = "Select * From Authors"; // Print out data with data reader. DbDataReader dr = cmd.ExecuteReader(CommandBehavior.CloseConnection); Console.WriteLine("Your data reader object is a: {0}", dr.GetType().FullName); Console.WriteLine("\n***** Authors in Pubs *****"); while (dr.Read()) Console.WriteLine("-> {0}, {1}", dr["au_lname"], dr["au_fname"]); dr.Close(); } Notice that for diagnostic purposes, you are printing out the fully qualified name of the underlying connection, command, and data reader using reflection services. If you run this application, you will find that the Microsoft SQL Server provider has been used to read data from the Authors table of the Pubs database (see Figure 22-2).

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Now, if you change the *.config file to specify System.Data.OleDb as the data provider (and update your connection string) as follows: <configuration> <appSettings> <!-- Which provider --> <add key="provider" value="System.Data.OleDb" /> <!-- Which connection string --> <add key="cnStr" value=

Perhaps better named the equal to or starts with attribute selector, the partial attribute selector with its pipe-equal (|=) syntax matches attribute values that either match exactly or begin with the given text. For example: img[src|="vacation"] { float: left; } would target any image whose src value begins with vacation. It would match vacation/photo1.jpg and vacation1.jpg, but not /vacation/photo1.jpg. Attribute selectors, like adjacent sibling selectors, would be more valuable if Internet Explorer 6 and lower supported them (again, they are supported in IE 7). Since it doesn t, many web developers are forced to admire them from afar.

The Toolbox contains many common controls that you can use on the UserForm, including text boxes, combo boxes, and command buttons It s similar to the Toolbox in Microsoft Access You are equipped with a very powerful set of development tools in Excel 2007 In 2, we are going to look at the many ways to bring data in and out of an Excel 2007 workbook project..

"Provider=SQLOLEDB.1;Data Source=localhost;uid=sa;pwd=;Initial Catalog=Pubs"/> </appSettings> </configuration> you will find the System.Data.OleDb types are used behind the scenes (see Figure 22-3).

Of course, based on your experience with ADO.NET, you may be a bit unsure exactly what the connection, command, and data reader objects are actually doing. Don t sweat the details for the time being (quite a few pages remain in this chapter, after all!). At this point, just understand that under .NET 2.0, it is possible to build a single code base that can consume various data providers in a declarative manner. Although this is a very powerful model, you must make sure that the code base does indeed make use only of types and methods that are common to all providers. Therefore, when authoring your code base, you will be limited to the members exposed by DbConnection, DbCommand, and the other types of the System.Data.Common namespace. Given this, you may find that this generalized approach will prevent you from directly accessing some of the bells and whistles of a particular DBMS (so be sure to test your code!).

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