1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
|
/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
*
* Copyright (C) 2009 Sun Microsystems, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "config.h"
#include <drizzled/show.h>
#include <drizzled/session.h>
#include <drizzled/lock.h>
#include <drizzled/statement/drop_table.h>
#include "drizzled/sql_table.h"
namespace drizzled
{
/*
delete (drop) tables.
SYNOPSIS
rm_table()
session Thread handle
tables List of tables to delete
if_exists If 1, don't give error if one table doesn't exists
NOTES
Will delete all tables that can be deleted and give a compact error
messages for tables that could not be deleted.
If a table is in use, we will wait for all users to free the table
before dropping it
Wait if global_read_lock (FLUSH TABLES WITH READ LOCK) is set, but
not if under LOCK TABLES.
RETURN
false OK. In this case ok packet is sent to user
true Error
*/
static bool rm_table(Session *session, TableList *tables, bool if_exists, bool drop_temporary)
{
bool error, need_start_waiting= false;
/* mark for close and remove all cached entries */
if (not drop_temporary)
{
if (not (need_start_waiting= not session->wait_if_global_read_lock(false, true)))
return true;
}
/*
Acquire table::Cache::singleton().mutex() after wait_if_global_read_lock(). If we would hold
table::Cache::singleton().mutex() during wait_if_global_read_lock(), other threads could not
close their tables. This would make a pretty deadlock.
*/
error= rm_table_part2(session, tables, if_exists, drop_temporary);
if (need_start_waiting)
{
session->startWaitingGlobalReadLock();
}
if (error)
return true;
session->my_ok();
return false;
}
bool statement::DropTable::execute()
{
TableList *first_table= (TableList *) getSession()->lex->select_lex.table_list.first;
TableList *all_tables= getSession()->lex->query_tables;
assert(first_table == all_tables && first_table != 0);
if (not drop_temporary)
{
if (getSession()->inTransaction())
{
my_error(ER_TRANSACTIONAL_DDL_NOT_SUPPORTED, MYF(0));
return true;
}
}
/* DDL and binlog write order protected by table::Cache::singleton().mutex() */
return rm_table(getSession(), first_table, drop_if_exists, drop_temporary);
}
} /* namespace drizzled */
|