Drizzled Public API Documentation

random_number.cc
1 /* - mode: c; c-basic-offset: 2; indent-tabs-mode: nil; -*-
2  * vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
3  *
4  * Copyright (C) 2010 Brian Aker
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation; either version 2 of the License, or
9  * (at your option) any later version.
10  *
11  * This program is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14  * GNU General Public License for more details.
15  *
16  * You should have received a copy of the GNU General Public License
17  * along with this program; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #include <config.h>
22 
23 #include <plugin/utility_dictionary/dictionary.h>
24 
25 #include <drizzled/atomics.h>
26 #include <drizzled/session.h>
27 #include <drizzled/sql_lex.h>
28 
29 using namespace drizzled;
30 using namespace std;
31 
32 utility_dictionary::RandomNumber::RandomNumber() :
33  plugin::TableFunction("DATA_DICTIONARY", "RANDOM_NUMBER")
34 {
35  add_field("VALUE", plugin::TableFunction::NUMBER, 0, false);
36 }
37 
38 bool utility_dictionary::RandomNumber::Generator::populate()
39 {
40  if (lex().isSumExprUsed() && count > 0)
41  return false;
42 
43  if (lex().current_select->group_list.elements && count > 0)
44  return false;
45 
46  if (lex().current_select->explicit_limit or count == 0)
47  {
48  push(static_cast<int64_t>(random()));
49  }
50  else
51  {
52  return false;
53  }
54 
55  count++;
56 
57  return true;
58 }
TODO: Rename this file - func.h is stupid.
Definition: engine.cc:41