Fix for CONPY-67:

If no rows were fetched from an unbuffered cursor (resultset) rowcount
now returns -1 instead of 0.

include/mariadb_python.h

@@ -253,8 +253,7 @@ typedef struct {
     enum enum_result_format result_format;
     uint8_t is_prepared;
     uint8_t is_buffered;
-/*    uint8_t is_named_tuple;
-    uint8_t is_dictionary; */
+    uint8_t fetched;
     uint8_t is_closed;
     uint8_t is_text;
     MrdbParser *parser;

src/mariadb_cursor.c

@@ -429,6 +429,7 @@ void MrdbCursor_clear(MrdbCursor *self, uint8_t new_stmt)
         }
 
     }
+    self->fetched= 0;
 
     if (self->is_text)
     {
@@ -902,6 +903,8 @@ static int MrdbCursor_fetchinternal(MrdbCursor *self)
     int rc;
     unsigned int i;
 
+    self->fetched= 1;
+
     if (!self->is_text)
     {
         rc= mysql_stmt_fetch(self->stmt);
@@ -1418,7 +1421,13 @@ Mariadb_row_count(MrdbCursor *self)
 
     if (self->field_count)
     {
-        row_count= CURSOR_NUM_ROWS(self);
+        if (!self->is_buffered && !self->fetched)
+        {
+            row_count= -1;
+        } else
+        {
+            row_count= CURSOR_NUM_ROWS(self);
+        }
     }
     else {
         row_count= self->row_count ? self->row_count : CURSOR_AFFECTED_ROWS(self);

test/integration/test_cursor.py

@@ -141,13 +141,13 @@ class TestCursor(unittest.TestCase):
         self.assertRaises(mariadb.Error, cursor.fetchall)
 
         cursor.execute("SELECT id, name, city FROM test_fetchmany ORDER BY id")
-        self.assertEqual(0, cursor.rowcount)
+        self.assertEqual(-1, cursor.rowcount)
         row = cursor.fetchall()
         self.assertEqual(row, params)
         self.assertEqual(5, cursor.rowcount)
 
         cursor.execute("SELECT id, name, city FROM test_fetchmany ORDER BY id")
-        self.assertEqual(0, cursor.rowcount)
+        self.assertEqual(-1, cursor.rowcount)
 
         row = cursor.fetchmany(1)
         self.assertEqual(row, [params[0]])
@@ -927,5 +927,17 @@ class TestCursor(unittest.TestCase):
         row= cur.fetchone()
         self.assertEqual(row[0], Decimal(1.25))
 
+    def test_conpy67(self):
+        con= create_connection()
+        cur = con.cursor()
+        cur.execute("SELECT 1")
+        self.assertEqual(cur.rowcount, -1)
+        del cur
+        cur = con.cursor()
+        cur.execute("SELECT 1 WHERE 1=2")
+        self.assertEqual(cur.rowcount, -1)
+        cur.fetchall()
+        self.assertEqual(cur.rowcount, 0)
+
 if __name__ == '__main__':
     unittest.main()