Add the -Provider parameter to the New-SqlConnection cmdlet

Author: CedX

src/Connection/New-Connection.ps1

@@ -10,14 +10,19 @@ using namespace System.Diagnostics.CodeAnalysis
 	The newly created database connection.
 #>
 function New-SqlConnection {
-	[CmdletBinding()]
+	[CmdletBinding(DefaultParameterSetName = "Type")]
 	[OutputType([System.Data.IDbConnection])]
 	[SuppressMessage("PSUseShouldProcessForStateChangingFunctions", "")]
 	param (
 		# The type of connection class to instantiate.
-		[Parameter(Mandatory, Position = 0)]
+		[Parameter(Mandatory, ParameterSetName = "Type", Position = 0)]
 		[Type] $Type,
 
+		# The name of an ADO.NET provider.
+		[Parameter(Mandatory, ParameterSetName = "Provider", Position = 0)]
+		[ValidateSet("Odbc", "OleDb", "SqlClient")]
+		[string] $Provider,
+
 		# The connection string used to open the database.
 		[Parameter(Mandatory, Position = 1, ValueFromPipeline)]
 		[string] $ConnectionString,
@@ -27,7 +32,14 @@ function New-SqlConnection {
 	)
 
 	process {
-		$connection = [IDbConnection] [Activator]::CreateInstance($Type, $ConnectionString)
+		$class = switch ($Provider) {
+			"Odbc" { [Odbc.OdbcConnection]; break }
+			"OleDb" { [OleDb.OleDbConnection]; break }
+			"SqlClient" { [SqlClient.SqlConnection]; break }
+			default { $Type }
+		}
+
+		$connection = [IDbConnection] [Activator]::CreateInstance($class, $ConnectionString)
 		if ($Open) { $connection.Open() }
 		$connection
 	}

test/Connection/New-Connection.Tests.ps1

@@ -7,9 +7,12 @@ using module ../../Sql.psd1
 	Tests the features of the `New-Connection` cmdlet.
 #>
 Describe "New-Connection" {
-	It "should create a connection of the specified type" {
-		$connection = New-SqlConnection ([System.Data.SQLite.SQLiteConnection]) "DataSource=:memory:"
-		$connection | Should -BeOfType ([System.Data.SQLite.SQLiteConnection])
+	It "should create a connection of the specified type" -ForEach @(
+		@{ Provider = [System.Data.SQLite.SQLiteConnection]; ConnectionString = "DataSource=:memory:"; Expected = [System.Data.SQLite.SQLiteConnection] }
+		@{ Provider = "SqlClient"; ConnectionString = "Server=localhost; Database=TestDb; Uid=user; Pwd=password"; Expected = [System.Data.SqlClient.SqlConnection] }
+	) {
+		$connection = New-SqlConnection $provider $connectionString
+		$connection | Should -BeOfType $expected
 		$connection.State | Should -Be ([ConnectionState]::Closed)
 		$connection.Dispose()
 	}