From b2aa75938442877a6c70dc1a19db2c6073d917ee Mon Sep 17 00:00:00 2001
From: Paul Sokolovsky <pfalcon@users.sourceforge.net>
Date: Tue, 17 Jun 2014 00:50:08 +0300
Subject: [PATCH] sqlite3: Reliably detect data query vs modification SQL
 statements.

---
 sqlite3/sqlite3.py | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/sqlite3/sqlite3.py b/sqlite3/sqlite3.py
index b73fd1db..7c34d13c 100644
--- a/sqlite3/sqlite3.py
+++ b/sqlite3/sqlite3.py
@@ -89,8 +89,10 @@ class Cursor:
         self.num_cols = sqlite3_column_count(self.stmnt)
         print("num_cols", self.num_cols)
         # If it's not select, actually execute it here
-        if not sql.startswith("SELECT"):
-            self.fetchone()
+        # num_cols == 0 for statements which don't return data (=> modify it)
+        if not self.num_cols:
+            v = self.fetchone()
+            assert v is None
 
     def close(self):
         s = sqlite3_finalize(self.stmnt)