Collect rowcount in executemany even when discarding results

Closes #633.

NEWS

@@ -13,10 +13,12 @@ What's new in psycopg 2.7.4
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 - Fixed Solaris 10 support (:ticket:`#532`).
-- Fixed `!MinTimeLoggingCursor` on Python 3 (:ticket:`#609`).
+- Fixed `~psycopg2.extras.MinTimeLoggingCursor` on Python 3 (:ticket:`#609`).
 - Fixed parsing of array of points as floats (:ticket:`#613`).
 - Fixed `~psycopg2.__libpq_version__` building with libpq >= 10.1
   (:ticket:`632`).
+- Fixed `~cursor.rowcount` after `~cursor.executemany()` with :sql:`RETURNING` statements
+  (:ticket:`633`).
 - Wheel packages compiled against PostgreSQL 10.1 libpq and OpenSSL 1.0.2m.
 
 

psycopg/pqpath.c

@@ -1952,8 +1952,9 @@ pq_fetch(cursorObject *curs, int no_result)
         }
         else {
             Dprintf("pq_fetch: got tuples, discarding them");
+            /* TODO: is there any case in which PQntuples == PQcmdTuples? */
+            _read_rowcount(curs);
             CLEARPGRES(curs->pgres);
-            curs->rowcount = -1;
             ex = 0;
         }
         break;

tests/test_cursor.py

@@ -583,6 +583,20 @@ class CursorTests(ConnectingTestCase):
 
             self.assertEqual(victim_conn.closed, 2)
 
+    @skip_before_postgres(8, 2)
+    def test_rowcount_on_executemany_returning(self):
+        cur = self.conn.cursor()
+        cur.execute("create table execmany(id serial primary key, data int)")
+        cur.executemany(
+            "insert into execmany (data) values (%s)",
+            [(i,) for i in range(4)])
+        self.assertEqual(cur.rowcount, 4)
+
+        cur.executemany(
+            "insert into execmany (data) values (%s) returning data",
+            [(i,) for i in range(5)])
+        self.assertEqual(cur.rowcount, 5)
+
 
 def test_suite():
     return unittest.TestLoader().loadTestsFromName(__name__)