clear the list of sql string at the beginning of a transaction, so we do not...

clear the list of sql string at the beginning of a transaction, so we do not execute again and again previous sql queries

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@11895 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ZMySQLDDA/db.py

@@ -119,6 +119,10 @@ class DeferredDB(DB):
         from thread import get_ident
         self._tlock.acquire()
         self._tthread = get_ident()
+        # The Deferred DB instance is sometimes used for several
+        # transactions, so it is required to clear the sql_string_list
+        # each time a transaction starts
+        self.sql_string_list = []
 
     def _finish(self, *ignored):
         from thread import get_ident