Drizzled Public API Documentation

savepoint.cc
1 /* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
2  * vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
3  *
4  * Copyright (C) 2009 Sun Microsystems, Inc.
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 #include <drizzled/show.h>
23 #include <drizzled/session.h>
24 #include <drizzled/statement/savepoint.h>
25 #include <drizzled/transaction_services.h>
26 #include <drizzled/named_savepoint.h>
27 #include <drizzled/session/transactions.h>
28 
29 #include <string>
30 #include <deque>
31 
32 using namespace std;
33 
34 namespace drizzled {
35 
36 bool statement::Savepoint::execute()
37 {
38  if (! (session().options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN)))
39  {
40  /* AUTOCOMMIT is on and not in a BEGIN */
41  session().my_ok();
42  }
43  else
44  {
45  /*
46  * If AUTOCOMMIT is off and resource contexts are empty then we need
47  * to start a transaction. It will be empty when SAVEPOINT starts the
48  * transaction. Table affecting statements do this work in lockTables()
49  * by calling startStatement().
50  */
51  if ( (session().options & OPTION_NOT_AUTOCOMMIT) &&
52  (transaction().all.getResourceContexts().empty() == true) )
53  {
54  if (session().startTransaction() == false)
55  {
56  return false;
57  }
58  }
59 
60  /*
61  * Look through the savepoints. If we find one with
62  * the same name, delete it.
63  */
64  deque<NamedSavepoint> &savepoints= transaction().savepoints;
65  deque<NamedSavepoint>::iterator iter;
66 
67  for (iter= savepoints.begin();
68  iter != savepoints.end();
69  ++iter)
70  {
71  NamedSavepoint &sv= *iter;
72  const string &sv_name= sv.getName();
73  if (my_strnncoll(system_charset_info,
74  (unsigned char *) lex().ident.data(),
75  lex().ident.size(),
76  (unsigned char *) sv_name.c_str(),
77  sv_name.size()) == 0)
78  break;
79  }
80  if (iter != savepoints.end())
81  {
82  NamedSavepoint &sv= *iter;
83  (void) TransactionServices::releaseSavepoint(session(), sv);
84  savepoints.erase(iter);
85  }
86 
87  NamedSavepoint newsv(lex().ident.data(), lex().ident.size());
88 
89  if (TransactionServices::setSavepoint(session(), newsv))
90  {
91  return true;
92  }
93  else
94  {
95  savepoints.push_front(newsv);
96  session().my_ok();
97  }
98  }
99  return false;
100 }
101 
102 } /* namespace drizzled */
void my_ok(ha_rows affected_rows=0, ha_rows found_rows_arg=0, uint64_t passed_id=0, const char *message=NULL)
Definition: session.cc:1877