Move setTransactionMode() to ADODB_pdo_sqlsrv class

Method was previously in ADORecordSet_array_pdo_sqlsrv class, which does
not make sense.

Originally added in ADOdb#349 (bdbacb2).

Fixes ADOdb#939

drivers/adodb-pdo_sqlsrv.inc.php

@@ -36,6 +36,17 @@ function _init(ADODB_pdo $parentDriver)
 		$parentDriver->fmtDate = "'Y-m-d'";
 	}
 
+	function setTransactionMode( $transaction_mode )
+	{
+		$this->_transmode  = $transaction_mode;
+		if (empty($transaction_mode)) {
+			$this->_connectionID->query('SET TRANSACTION ISOLATION LEVEL READ COMMITTED');
+			return;
+		}
+		if (!stristr($transaction_mode,'isolation')) $transaction_mode = 'ISOLATION LEVEL '.$transaction_mode;
+		$this->_connectionID->query("SET TRANSACTION ".$transaction_mode);
+	}
+
 	function MetaColumns($table, $normalize = true)
 	{
 		return false;
@@ -160,15 +171,5 @@ public function fetchField($fieldOffset = 0)
 
 		return $o;
 	}
-
-	function SetTransactionMode( $transaction_mode )
-	{
-		$this->_transmode  = $transaction_mode;
-		if (empty($transaction_mode)) {
-			$this->_connectionID->query('SET TRANSACTION ISOLATION LEVEL READ COMMITTED');
-			return;
-		}
-		if (!stristr($transaction_mode,'isolation')) $transaction_mode = 'ISOLATION LEVEL '.$transaction_mode;
-		$this->_connectionID->query("SET TRANSACTION ".$transaction_mode);
-	}
+
 }