Here is a bug and patch to fix it. I have tested this bug and fix on

FreeBSD/Intel and DecUX/Alpha machines. The bug appears in postgresql
6.5.3 and 7.0.2. Can someone please review it and apply it to the
source tree?

Sometimes when the postgres connection dies it is necessary to
attempt to reconnect. Calling the pgconnection::Connect method in a
derived class leaks memory because it does not clear the current
connection (if there is one). These patches ensures that any open
connections are closed before attempting to open a new one.

-Michael Richards

src/interfaces/libpq++/pgconnection.cc

@@ -10,7 +10,7 @@
  * Copyright (c) 1994, Regents of the University of California
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/interfaces/libpq++/Attic/pgconnection.cc,v 1.9 2000/04/22 22:39:15 tgl Exp $
+ *	  $Header: /cvsroot/pgsql/src/interfaces/libpq++/Attic/pgconnection.cc,v 1.10 2000/07/27 19:44:01 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -46,16 +46,32 @@ PgConnection::~PgConnection()
   // Close the connection only if needed
   // This feature will most probably be used by the derived classes that
   // need not close the connection after they are destructed.
-  if ( pgCloseConnection ) {
+  CloseConnection();
+}
+
+
+// PgConnection::CloseConnection()
+// close down the connection if there is one
+void PgConnection::CloseConnection() 
+{
+  // if the connection is open, close it first
+  if ( pgCloseConnection ) {    
        if(pgResult) PQclear(pgResult);
+       pgResult=NULL;
        if(pgConn) PQfinish(pgConn);
+       pgConn=NULL;
+       pgCloseConnection=0;
   }
 }
 
+
 // PgConnection::connect
 // establish a connection to a backend
 ConnStatusType PgConnection::Connect(const char* conninfo)
 {
+  // if the connection is open, close it first
+  CloseConnection();
+
   // Connect to the database
   pgConn = PQconnectdb(conninfo);
 

src/interfaces/libpq++/pgconnection.h

@@ -13,7 +13,7 @@
  * Portions Copyright (c) 1996-2000, PostgreSQL, Inc
  * Portions Copyright (c) 1994, Regents of the University of California
  * 
- * $Id: pgconnection.h,v 1.7 2000/04/22 22:39:15 tgl Exp $
+ * $Id: pgconnection.h,v 1.8 2000/07/27 19:44:01 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -81,6 +81,7 @@ public:
     
 protected:
    ConnStatusType Connect(const char* conninfo);
+   void CloseConnection();
    string IntToString(int);
    // Default constructor is only available to subclasses
    PgConnection();