Generalize transactions

adminer/drivers/mssql.inc.php

@@ -258,6 +258,10 @@ if (isset($_GET["mssql"])) {
 			return true;
 		}
 		
+		function begin() {
+			return queries("BEGIN TRANSACTION");
+		}
+		
 	}
 
 
@@ -485,10 +489,6 @@ WHERE OBJECT_NAME(i.object_id) = " . q($table)
 		;
 	}
 	
-	function begin() {
-		return queries("BEGIN TRANSACTION");
-	}
-	
 	function last_id() {
 		global $connection;
 		return $connection->result("SELECT SCOPE_IDENTITY()"); // @@IDENTITY can return trigger INSERT

adminer/drivers/mysql.inc.php

@@ -837,13 +837,6 @@ if (!defined("DRIVER")) {
 		return array(); // "SQL" not required
 	}
 	
-	/** Begin transaction
-	* @return bool
-	*/
-	function begin() {
-		return queries("BEGIN");
-	}
-	
 	/** Get last auto increment ID
 	* @return string
 	*/

adminer/drivers/oracle.inc.php

@@ -138,6 +138,10 @@ if (isset($_GET["oracle"])) {
 		
 		//! support empty $set in insert()
 		
+		function begin() {
+			return true; // automatic start
+		}
+		
 	}
 
 
@@ -328,10 +332,6 @@ ORDER BY uc.constraint_type, uic.column_position", $connection2) as $row) {
 		return apply_queries("DROP TABLE", $tables);
 	}
 
-	function begin() {
-		return true; // automatic start
-	}
-	
 	function last_id() {
 		return 0; //!
 	}

adminer/drivers/pgsql.inc.php

@@ -539,10 +539,6 @@ ORDER BY p.proname');
 		return get_vals("SELECT langname FROM pg_catalog.pg_language");
 	}
 	
-	function begin() {
-		return queries("BEGIN");
-	}
-	
 	function last_id() {
 		return 0; // there can be several sequences
 	}

adminer/drivers/simpledb.inc.php

@@ -210,6 +210,18 @@ if (isset($_GET["simpledb"])) {
 			return true;
 		}
 		
+		function begin() {
+			return false;
+		}
+		
+		function commit() {
+			return false;
+		}
+		
+		function rollback() {
+			return false;
+		}
+		
 	}