[glom] PostgreSQL: Print stderr message when the connection fails completely.

[Murray Cumming <murrayc src gnome org>]

commit 4f351903032bcf6431eb1908b5771f68c9b1f468
Author: Murray Cumming <murrayc murrayc com>
Date:   Sun Dec 18 23:34:02 2011 +0100

    PostgreSQL: Print stderr message when the connection fails completely.
    
    * glom/libglom/connectionpool_backends/postgres.cc: This can provide
    a clue, for instance when the hostname cannot be resolved.

 ChangeLog                                        |    7 +++++++
 glom/libglom/connectionpool_backends/postgres.cc |    7 +++++--
 2 files changed, 12 insertions(+), 2 deletions(-)
---
diff --git a/ChangeLog b/ChangeLog
index 3e793e5..5c479d9 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,12 @@
 2011-12-18  Murray Cumming  <murrayc murrayc com>
 
+	PostgreSQL: Print stderr message when the connection fails completely.
+
+	* glom/libglom/connectionpool_backends/postgres.cc: This can provide 
+	a clue, for instance when the hostname cannot be resolved.
+
+2011-12-18  Murray Cumming  <murrayc murrayc com>
+
 	Add the glom_test_connection command-line tool.
 
 	* Makefile_libglom.am:
diff --git a/glom/libglom/connectionpool_backends/postgres.cc b/glom/libglom/connectionpool_backends/postgres.cc
index 1bda810..9d3bce2 100644
--- a/glom/libglom/connectionpool_backends/postgres.cc
+++ b/glom/libglom/connectionpool_backends/postgres.cc
@@ -106,7 +106,7 @@ Glib::RefPtr<Gnome::Gda::Connection> Postgres::attempt_connect(const Glib::ustri
   catch(const Glib::Error& ex)
   {
 #ifdef GLOM_CONNECTION_DEBUG
-    std::cout << "debug: " << G_STRFUNC << ": Attempt to connect to database failed on port=" << port << ", database=" << database << ": " << ex.what() << std::endl;
+    std::cout << "debug: " << G_STRFUNC << ": Attempt to connect to database failed on port=" << port << ", database=" << database << ": " << "error code=" << ex.code() << ", error message: " <<  ex.what() << std::endl;
     std::cout << "debug: " << G_STRFUNC << ": Attempting to connect without specifying the database." << std::endl;
 #endif
 
@@ -120,7 +120,10 @@ Glib::RefPtr<Gnome::Gda::Connection> Postgres::attempt_connect(const Glib::ustri
         Gnome::Gda::CONNECTION_OPTIONS_SQL_IDENTIFIERS_CASE_SENSITIVE);
     }
     catch(const Glib::Error& ex)
-    {}
+    {
+      //Show this on stderr because it can contain useful clues such as a hostname that cannot be resolved.
+      std::cerr << G_STRFUNC << ": Attempt to connect to default database failed on port=" << port << " : " << "error code=" << ex.code() << ", error message: " <<  ex.what() << std::endl;
+    }
 
 #ifdef GLOM_CONNECTION_DEBUG
     if(temp_conn)