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Lesson 1: Configuration Settings
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settings will need to look like. For the sake of thoroughness, this configuration file hosts the following libraries: SqlClient, OracleClient, OleDb, and Odbc:
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< xml version="1.0" encoding="utf-8" > <configuration> <connectionStrings> <clear/> <add name="AdventureWorksString" providerName="System.Data.SqlClient" connectionString="Data Source=localhost;Initial Catalog=AdventureWorks; Integrated Security=true"/> <add name="MarsEnabledSqlServer2005String" providerName="System.Data.SqlClient" connectionString= "Server=Aron1;Database= pubs;Trusted_Connection=True;MultipleActiveResultSets=true" /> <add name="OdbcConnectionString" providerName="System.Data.Odbc" connectionString= "Driver={Microsoft Access Driver (*.mdb)};Dbq=C:\adatabase.mdb; Uid=Admin;Pwd=R3m3emberToUseStrongPasswords;"/> <add name="AccessConnectionString" providerName="System.Data.OleDb" connectionString="Provider=Microsoft.Jet.OLEDB.4.0; Data Source=\PathOrShare\mydb.mdb; User Id=admin;Password=Rememb3rStr0ngP4sswords;" /> <add name="OracleConnectionString" providerName="System.Data.OracleClient" connectionString="Data Source=MyOracleDB;Integrated Security=yes;" /> </connectionStrings> </configuration>
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To configure each of the preceding data libraries (OleDb, SqlClient, OracleClient, Odbc), do the following: 1. Specify the Clear element to eliminate any existing connection strings. 2. For each connection string (for example, SqlClient, OracleClient, and so on), add a Name element. This element allows the value to be referenced by name without the developer having to remember indices. 3. Specify a providerName attribute for each of the Name elements (for example, System.Data.OracleClient). 4. Specify a connectionString attribute with the appropriate connection string to connect to the data source. In the example just shown, for each library type, I ve added a specific connection string that corresponds to it. For the SqlClient library, I added two different connection strings just to illustrate that there s no problem associated with doing so. The
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second SqlClient connection string differs from the first mainly in that it enabled multiple active result sets (MARS). Now that you have the values set in the configuration file, here s how to access them:
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' VB Dim MySettings As ConnectionStringSettingsCollection = _ ConfigurationManager.ConnectionStrings If Not MySettings Is Nothing Then Dim sb As New StringBuilder Dim individualSettings As ConnectionStringSettings For Each individualSettings In MySettings sb.Append("Full Connection String: " & _ individualSettings.ConnectionString) sb.Append("Provider Name: " & individualSettings.ProviderName) sb.Append("Section Name: " & individualSettings.Name) Next Console.WriteLine(sb.ToString) End If // C# ConnectionStringSettingsCollection MySettings = ConfigurationManager.ConnectionStrings; if (MySettings != null) { StringBuilder sb = new StringBuilder(); foreach (ConnectionStringSettings individualSettings in MySettings) { sb.Append("Full Connection String: " + individualSettings.ConnectionString + "\r\n"); sb.Append("Provider Name: " + individualSettings.ProviderName + "\r\n"); sb.Append("Section Name: " + individualSettings.Name + "\r\n"); } Console.WriteLine(sb.ToString()); }
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To summarize what the preceding code does, it creates an instance of the ConnectionStringSettingsCollection object and then sets it to the result of the ConfigurationManager s ConnectionStrings property. Three properties are of particular importance: Name, ProviderName, and ConnectionString. Of the three, ConnectionString is probably the most important because it s the one you ll need to create or instantiate a new Connection object. The following code (which requires the System.Data.SqlClient, System .Data.OracleClient, System.Data.OleDB, and System.Data.Odbc namespaces) may be
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Lesson 1: Configuration Settings
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added to the foreach loop of the preceding code snippets to create a connection based on the values of those properties:
' VB Dim MyConnection As IDbConnection Select Case individualSettings.ProviderName Case "System.Data.SqlClient" MyConnection = New SqlConnection(individualSettings.ConnectionString) Case "System.Data.OracleClient" MyConnection = New OracleConnection(individualSettings.ConnectionString) Case "System.Data.OleDb" MyConnection = New OleDbConnection(individualSettings.ConnectionString) Case "System.Data.Odbc" MyConnection = New OdbcConnection(individualSettings.ConnectionString) End Select // C# IDbConnection MyConnection = null; switch (individualSettings.ProviderName) { case "System.Data.SqlClient": MyConnection = new SqlConnection(individualSettings.ConnectionString); break; case "System.Data.OracleClient": MyConnection = new racleConnection(individualSettings.ConnectionString); break; case "System.Data.OleDb": MyConnection = new OleDbConnection(individualSettings.ConnectionString); break; case "System.Data.Odbc": MyConnection = new OdbcConnection(individualSettings.ConnectionString); break; }
Although the preceding code illustrates how to retrieve different types of connection strings stored in a configuration file, typical applications don t use multiple database providers. A more typical scenario is using just one database or using multiple databases of the same type for example, multiple SQL Server databases. As such, if you know what you are looking for, iterating a collection is unnecessary and possibly ambiguous. Accordingly, you might want to directly retrieve the connection string for the provider that you know exists. There are two ways to accomplish this. The first approach is to use the section name of the section accessing the library type, as shown here:
' VB Dim MySettings As ConnectionStringSettings = _ ConfigurationManager.ConnectionStrings( AdventureWorksString )
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