From c0f47cc8feb0cdfceb6868d41747520d7e1fdeed Mon Sep 17 00:00:00 2001
From: Fabio Erculiani <lxnay@sabayon.org>
Date: Sun, 27 Feb 2011 23:18:52 +0100
Subject: [PATCH] [entropy.db] EntropyRepository: rewrite
 _doesColumnInTableExist() to be more efficient

---
 libraries/entropy/db/__init__.py | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/libraries/entropy/db/__init__.py b/libraries/entropy/db/__init__.py
index 6c28208a3..f9c265938 100644
--- a/libraries/entropy/db/__init__.py
+++ b/libraries/entropy/db/__init__.py
@@ -5118,10 +5118,13 @@ class EntropyRepository(EntropyRepositoryBase):
             del cached
             return obj
 
-        cur = self._cursor().execute('PRAGMA table_info( %s )' % (table,))
-        rslt = (x[1] for x in cur.fetchall())
-
-        exists = column in rslt
+        try:
+            self._cursor().execute("""
+            SELECT `%s` FROM `%s` LIMIT 1
+            """ % (column, table))
+            exists = True
+        except OperationalError:
+            exists = False
         cached[d_tup] = exists
         self._setLiveCache("_doesColumnInTableExist", cached)
         # avoid python3.x memleak