Drizzled Public API Documentation

connection_id.cc

00001 /* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
00002  *  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
00003  *
00004  *  Copyright (C) 2008 Sun Microsystems, Inc.
00005  *
00006  *  This program is free software; you can redistribute it and/or modify
00007  *  it under the terms of the GNU General Public License as published by
00008  *  the Free Software Foundation; version 2 of the License.
00009  *
00010  *  This program is distributed in the hope that it will be useful,
00011  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
00012  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00013  *  GNU General Public License for more details.
00014  *
00015  *  You should have received a copy of the GNU General Public License
00016  *  along with this program; if not, write to the Free Software
00017  *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
00018  */
00019 
00020 #include <config.h>
00021 #include <drizzled/function/math/int.h>
00022 #include <drizzled/plugin/function.h>
00023 #include <drizzled/session.h>
00024 
00025 using namespace std;
00026 using namespace drizzled;
00027 
00028 class ConnectionIdFunction :public Item_int_func
00029 {
00030   int64_t value;
00031 public:
00032   ConnectionIdFunction() :Item_int_func() {}
00033   
00034   int64_t val_int() 
00035   {
00036     assert(fixed == true);
00037     return value;
00038   }
00039   
00040   const char *func_name() const 
00041   { 
00042     return "connection_id"; 
00043   }
00044 
00045   void fix_length_and_dec() 
00046   {
00047     Item_int_func::fix_length_and_dec();
00048     max_length= 10;
00049   }
00050 
00051   bool fix_fields(Session *session, Item **ref)
00052   {
00053     if (Item_int_func::fix_fields(session, ref))
00054     {
00055       return true;
00056     }
00057 
00058     value= session->variables.pseudo_thread_id;
00059     return false;
00060   }
00061 
00062   bool check_argument_count(int n)
00063   {
00064     return (n == 0);
00065   }
00066 };
00067 
00068 
00069 plugin::Create_function<ConnectionIdFunction> *connection_idudf= NULL;
00070 
00071 static int initialize(module::Context &context)
00072 {
00073   connection_idudf=
00074     new plugin::Create_function<ConnectionIdFunction>("connection_id");
00075   context.add(connection_idudf);
00076   return 0;
00077 }
00078 
00079 DRIZZLE_DECLARE_PLUGIN
00080 {
00081   DRIZZLE_VERSION_ID,
00082   "connection_id",
00083   "1.0",
00084   "Devananda van der Veen",
00085   "Return the current connection_id",
00086   PLUGIN_LICENSE_GPL,
00087   initialize, /* Plugin Init */
00088   NULL,   /* depends */
00089   NULL    /* config options */
00090 }
00091 DRIZZLE_DECLARE_PLUGIN_END;