From a559fc0b0cb8e3a4de91680773a8f4fea2c9a3d3 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Fri, 30 Jul 2010 13:26:36 +0200
Subject: Pass CLIENT_FOUND_ROWS to connect

---
 odb/mysql/connection.cxx | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

(limited to 'odb/mysql/connection.cxx')

diff --git a/odb/mysql/connection.cxx b/odb/mysql/connection.cxx
index 2e42b9e..27e3067 100644
--- a/odb/mysql/connection.cxx
+++ b/odb/mysql/connection.cxx
@@ -20,6 +20,11 @@ namespace odb
       if (mysql_init (handle_) == 0)
         throw std::bad_alloc ();
 
+      // Force the CLIENT_FOUND_ROWS flag so that UPDATE returns the
+      // number of found rows, not the number of changed rows. This
+      // is necessary to distinguish between the object-not-persistent
+      // and nothing-changed conditions.
+      //
       if (mysql_real_connect (handle_,
                               db.host (),
                               db.user (),
@@ -27,7 +32,7 @@ namespace odb
                               db.db (),
                               db.port (),
                               db.socket (),
-                              db.client_flags ()) == 0)
+                              db.client_flags () | CLIENT_FOUND_ROWS) == 0)
       {
         database_exception e (handle_);
         mysql_close (handle_);
-- 
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