[IMP] Cursor.savepoint

time.time doesn't guarantee sub-second precision.

Use a uuid1 instead (lower anonymity but higher isolation than uuid4
especially in distributed systems, and we don't care about anonimity for
savepoint names from application servers).

Quote name so first character can be a digit.

bzr revid: xmo@openerp.com-20140220103345-xistzxy17r8j87hf

openerp/sql_db.py

@@ -31,6 +31,7 @@ from contextlib import contextmanager
 from functools import wraps
 import logging
 import time
+import uuid
 import psycopg2.extensions
 from psycopg2.extensions import ISOLATION_LEVEL_AUTOCOMMIT, ISOLATION_LEVEL_READ_COMMITTED, ISOLATION_LEVEL_REPEATABLE_READ
 from psycopg2.pool import PoolError
@@ -350,13 +351,13 @@ class Cursor(object):
     @check
     def savepoint(self):
         """context manager entering in a new savepoint"""
-        name = hex(int(time.time() * 1000))[1:]
-        self.execute("SAVEPOINT %s" % (name,))
+        name = uuid.uuid1().hex
+        self.execute('SAVEPOINT "%s"' % name)
         try:
             yield
-            self.execute('RELEASE SAVEPOINT %s' % (name,))
-        except Exception:
-            self.execute('ROLLBACK TO SAVEPOINT %s' % (name,))
+            self.execute('RELEASE SAVEPOINT "%s"' % name)
+        except:
+            self.execute('ROLLBACK TO SAVEPOINT "%s"' % name)
             raise
 
     @check