Drizzled Public API Documentation

show_tables.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 
22 #include <config.h>
23 #include <plugin/show_dictionary/dictionary.h>
24 #include <drizzled/identifier.h>
25 
26 using namespace std;
27 using namespace drizzled;
28 
29 ShowTables::ShowTables() :
30  show_dictionary::Show("SHOW_TABLES")
31 {
32  add_field("TABLE_NAME", plugin::TableFunction::STRING, MAXIMUM_IDENTIFIER_LENGTH, false);
33 }
34 
35 ShowTables::Generator::Generator(drizzled::Field **arg) :
36  show_dictionary::Show::Generator(arg),
37  is_primed(false)
38 {
39  if (not isShowQuery())
40  return;
41 
42  statement::Show& select= static_cast<statement::Show&>(statement());
43 
44  if (not select.getShowSchema().empty())
45  {
46  schema_name.append(select.getShowSchema());
47  assert(not schema_name.empty());
48  }
49 }
50 
51 bool ShowTables::Generator::nextCore()
52 {
53  if (is_primed)
54  {
55  table_iterator++;
56  }
57  else
58  {
59  if (schema_name.empty())
60  {
61  is_primed= true;
62  return false;
63  }
64 
65  identifier::Schema identifier(getSession().catalog().identifier(),
66  schema_name);
67  plugin::StorageEngine::getIdentifiers(getSession(), identifier, set_of_identifiers);
68  table_iterator= set_of_identifiers.begin();
69  is_primed= true;
70  }
71 
72  if (table_iterator == set_of_identifiers.end())
73  return false;
74 
75  if (isWild((*table_iterator).getTableName()))
76  return false;
77 
78  return true;
79 }
80 
81 bool ShowTables::Generator::next()
82 {
83  while (not nextCore())
84  {
85  if (table_iterator != set_of_identifiers.end())
86  continue;
87 
88  return false;
89  }
90 
91  return true;
92 }
93 
94 bool ShowTables::Generator::populate()
95 {
96  if (not next())
97  return false;
98 
99  fill();
100 
101  return true;
102 }
103 
104 void ShowTables::Generator::fill()
105 {
106  /* TABLE_NAME */
107  push((*table_iterator).getTableName());
108 }
TODO: Rename this file - func.h is stupid.