Add has_multirow_insert

There are still many databases that doesn't support this SQL-92 syntax.

issue4881
review19331002

trytond/backend/database.py

@@ -220,6 +220,10 @@ class CursorInterface(object):
         :return: a boolean
         '''
 
+    def has_multirow_insert(self):
+        'Return True if database supports multirow insert'
+        return False
+
     def __build_dict(self, row):
         return dict((desc[0], row[i])
                 for i, desc in enumerate(self.description))

trytond/backend/mysql/database.py

@@ -308,6 +308,9 @@ class Cursor(CursorInterface):
     def has_constraint(self):
         return False
 
+    def has_multirow_insert(self):
+        return True
+
     def limit_clause(self, select, limit=None, offset=None):
         if offset and limit is None:
             limit = 18446744073709551610  # max bigint

trytond/backend/postgresql/database.py

@@ -361,6 +361,9 @@ class Cursor(CursorInterface):
         # RETURNING clause is available since PostgreSQL 8.2
         return self._database.get_version(self) >= (8, 2)
 
+    def has_multirow_insert(self):
+        return True
+
 register_type(UNICODE)
 if PYDATE:
     register_type(PYDATE)

trytond/backend/sqlite/database.py

@@ -392,6 +392,9 @@ class Cursor(CursorInterface):
     def has_constraint(self):
         return False
 
+    def has_multirow_insert(self):
+        return True
+
 sqlite.register_converter('NUMERIC', lambda val: Decimal(val.decode('utf-8')))
 if sys.version_info[0] == 2:
     sqlite.register_adapter(Decimal, lambda val: buffer(str(val)))

trytond/model/modelsql.py

@@ -353,8 +353,14 @@ class ModelSQL(ModelStorage):
                 cursor.execute(*history.insert(hcolumns,
                         table.select(*columns, where=where)))
             else:
-                cursor.execute(*history.insert(hcolumns,
-                        [[id_, CurrentTimestamp(), user] for id_ in sub_ids]))
+                if cursor.has_multirow_insert():
+                    cursor.execute(*history.insert(hcolumns,
+                            [[id_, CurrentTimestamp(), user]
+                                for id_ in sub_ids]))
+                else:
+                    for id_ in sub_ids:
+                        cursor.execute(*history.insert(hcolumns,
+                                [[id_, CurrentTimestamp(), user]]))
 
     @classmethod
     def _restore_history(cls, ids, datetime, _before=False):