diff -r 3b79a0fc91db -r c5aec27c1bf7 server/test/unittest_rql2sql.py
--- a/server/test/unittest_rql2sql.py	Mon Mar 08 09:51:29 2010 +0100
+++ b/server/test/unittest_rql2sql.py	Mon Mar 08 17:57:29 2010 +0100
@@ -13,7 +13,6 @@
 from logilab.common.testlib import TestCase, unittest_main, mock_object
 
 from rql import BadRQLQuery
-from indexer import get_indexer
 
 #from cubicweb.server.sources.native import remove_unused_solutions
 from cubicweb.server.sources.rql2sql import SQLGenerator, remove_unused_solutions
@@ -1072,7 +1071,7 @@
 WHERE rel_is0.eid_to=2'''),
 
     ]
-from logilab.common.adbh import ADV_FUNC_HELPER_DIRECTORY
+from logilab.db import get_db_helper
 
 class CWRQLTC(RQLGeneratorTC):
     schema = schema
@@ -1106,12 +1105,7 @@
     #capture = True
     def setUp(self):
         RQLGeneratorTC.setUp(self)
-        indexer = get_indexer('postgres', 'utf8')
-        dbms_helper = ADV_FUNC_HELPER_DIRECTORY['postgres']
-        dbms_helper.fti_uid_attr = indexer.uid_attr
-        dbms_helper.fti_table = indexer.table
-        dbms_helper.fti_restriction_sql = indexer.restriction_sql
-        dbms_helper.fti_need_distinct_query = indexer.need_distinct
+        dbms_helper = get_db_helper('postgres')
         self.o = SQLGenerator(schema, dbms_helper)
 
     def _norm_sql(self, sql):
@@ -1212,6 +1206,13 @@
 FROM cw_CWUser AS _X
 WHERE _X.cw_login IS NULL''')
 
+
+    def test_date_extraction(self):
+        self._check("Any MONTH(D) WHERE P is Personne, P creation_date D",
+                    '''SELECT CAST(EXTRACT(MONTH from _P.cw_creation_date) AS INTEGER)
+FROM cw_Personne AS _P''')
+
+
     def test_parser_parse(self):
         for t in self._parse(PARSER):
             yield t
@@ -1409,17 +1410,17 @@
 
     def setUp(self):
         RQLGeneratorTC.setUp(self)
-        indexer = get_indexer('sqlite', 'utf8')
-        dbms_helper = ADV_FUNC_HELPER_DIRECTORY['sqlite']
-        dbms_helper.fti_uid_attr = indexer.uid_attr
-        dbms_helper.fti_table = indexer.table
-        dbms_helper.fti_restriction_sql = indexer.restriction_sql
-        dbms_helper.fti_need_distinct_query = indexer.need_distinct
+        dbms_helper = get_db_helper('sqlite')
         self.o = SQLGenerator(schema, dbms_helper)
 
     def _norm_sql(self, sql):
         return sql.strip().replace(' ILIKE ', ' LIKE ').replace('\nINTERSECT ALL\n', '\nINTERSECT\n')
 
+    def test_date_extraction(self):
+        self._check("Any MONTH(D) WHERE P is Personne, P creation_date D",
+                    '''SELECT MONTH(_P.cw_creation_date)
+FROM cw_Personne AS _P''')
+
     def test_union(self):
         for t in self._parse((
             ('(Any N ORDERBY 1 WHERE X name N, X is State)'
@@ -1517,12 +1518,7 @@
 
     def setUp(self):
         RQLGeneratorTC.setUp(self)
-        indexer = get_indexer('mysql', 'utf8')
-        dbms_helper = ADV_FUNC_HELPER_DIRECTORY['mysql']
-        dbms_helper.fti_uid_attr = indexer.uid_attr
-        dbms_helper.fti_table = indexer.table
-        dbms_helper.fti_restriction_sql = indexer.restriction_sql
-        dbms_helper.fti_need_distinct_query = indexer.need_distinct
+        dbms_helper = get_db_helper('mysql')
         self.o = SQLGenerator(schema, dbms_helper)
 
     def _norm_sql(self, sql):
@@ -1537,6 +1533,11 @@
             latest = firstword
         return '\n'.join(newsql)
 
+    def test_date_extraction(self):
+        self._check("Any MONTH(D) WHERE P is Personne, P creation_date D",
+                    '''SELECT EXTRACT(MONTH from _P.cw_creation_date)
+FROM cw_Personne AS _P''')
+
     def test_from_clause_needed(self):
         queries = [("Any 1 WHERE EXISTS(T is CWGroup, T name 'managers')",
                     '''SELECT 1