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
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
|
/* Copyright (c) 2009, 2010, Oracle and/or its affiliates. All rights reserved.
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; version 2 of the License.
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 */
/**
@file Representation of an SQL command.
*/
#ifndef SQL_CMD_INCLUDED
#define SQL_CMD_INCLUDED
/*
When a command is added here, be sure it's also added in mysqld.cc
in "struct show_var_st status_vars[]= {" ...
If the command returns a result set or is not allowed in stored
functions or triggers, please also make sure that
sp_get_flags_for_command (sp_head.cc) returns proper flags for the
added SQLCOM_.
*/
enum enum_sql_command {
SQLCOM_SELECT, SQLCOM_CREATE_TABLE, SQLCOM_CREATE_INDEX, SQLCOM_ALTER_TABLE,
SQLCOM_UPDATE, SQLCOM_INSERT, SQLCOM_INSERT_SELECT,
SQLCOM_DELETE, SQLCOM_TRUNCATE, SQLCOM_DROP_TABLE, SQLCOM_DROP_INDEX,
SQLCOM_SHOW_DATABASES, SQLCOM_SHOW_TABLES, SQLCOM_SHOW_FIELDS,
SQLCOM_SHOW_KEYS, SQLCOM_SHOW_VARIABLES, SQLCOM_SHOW_STATUS,
SQLCOM_SHOW_ENGINE_LOGS, SQLCOM_SHOW_ENGINE_STATUS, SQLCOM_SHOW_ENGINE_MUTEX,
SQLCOM_SHOW_PROCESSLIST, SQLCOM_SHOW_MASTER_STAT, SQLCOM_SHOW_SLAVE_STAT,
SQLCOM_SHOW_GRANTS, SQLCOM_SHOW_CREATE, SQLCOM_SHOW_CHARSETS,
SQLCOM_SHOW_COLLATIONS, SQLCOM_SHOW_CREATE_DB, SQLCOM_SHOW_TABLE_STATUS,
SQLCOM_SHOW_TRIGGERS,
SQLCOM_LOAD,SQLCOM_SET_OPTION,SQLCOM_LOCK_TABLES,SQLCOM_UNLOCK_TABLES,
SQLCOM_GRANT,
SQLCOM_CHANGE_DB, SQLCOM_CREATE_DB, SQLCOM_DROP_DB, SQLCOM_ALTER_DB,
SQLCOM_REPAIR, SQLCOM_REPLACE, SQLCOM_REPLACE_SELECT,
SQLCOM_CREATE_FUNCTION, SQLCOM_DROP_FUNCTION,
SQLCOM_REVOKE,SQLCOM_OPTIMIZE, SQLCOM_CHECK,
SQLCOM_ASSIGN_TO_KEYCACHE, SQLCOM_PRELOAD_KEYS,
SQLCOM_FLUSH, SQLCOM_KILL, SQLCOM_ANALYZE,
SQLCOM_ROLLBACK, SQLCOM_ROLLBACK_TO_SAVEPOINT,
SQLCOM_COMMIT, SQLCOM_SAVEPOINT, SQLCOM_RELEASE_SAVEPOINT,
SQLCOM_SLAVE_START, SQLCOM_SLAVE_STOP,
SQLCOM_BEGIN, SQLCOM_CHANGE_MASTER,
SQLCOM_RENAME_TABLE,
SQLCOM_RESET, SQLCOM_PURGE, SQLCOM_PURGE_BEFORE, SQLCOM_SHOW_BINLOGS,
SQLCOM_SHOW_OPEN_TABLES,
SQLCOM_HA_OPEN, SQLCOM_HA_CLOSE, SQLCOM_HA_READ,
SQLCOM_SHOW_SLAVE_HOSTS, SQLCOM_DELETE_MULTI, SQLCOM_UPDATE_MULTI,
SQLCOM_SHOW_BINLOG_EVENTS, SQLCOM_DO,
SQLCOM_SHOW_WARNS, SQLCOM_EMPTY_QUERY, SQLCOM_SHOW_ERRORS,
SQLCOM_SHOW_STORAGE_ENGINES, SQLCOM_SHOW_PRIVILEGES,
SQLCOM_HELP, SQLCOM_CREATE_USER, SQLCOM_DROP_USER, SQLCOM_RENAME_USER,
SQLCOM_REVOKE_ALL, SQLCOM_CHECKSUM,
SQLCOM_CREATE_PROCEDURE, SQLCOM_CREATE_SPFUNCTION, SQLCOM_CALL,
SQLCOM_DROP_PROCEDURE, SQLCOM_ALTER_PROCEDURE,SQLCOM_ALTER_FUNCTION,
SQLCOM_SHOW_CREATE_PROC, SQLCOM_SHOW_CREATE_FUNC,
SQLCOM_SHOW_STATUS_PROC, SQLCOM_SHOW_STATUS_FUNC,
SQLCOM_PREPARE, SQLCOM_EXECUTE, SQLCOM_DEALLOCATE_PREPARE,
SQLCOM_CREATE_VIEW, SQLCOM_DROP_VIEW,
SQLCOM_CREATE_TRIGGER, SQLCOM_DROP_TRIGGER,
SQLCOM_XA_START, SQLCOM_XA_END, SQLCOM_XA_PREPARE,
SQLCOM_XA_COMMIT, SQLCOM_XA_ROLLBACK, SQLCOM_XA_RECOVER,
SQLCOM_SHOW_PROC_CODE, SQLCOM_SHOW_FUNC_CODE,
SQLCOM_ALTER_TABLESPACE,
SQLCOM_INSTALL_PLUGIN, SQLCOM_UNINSTALL_PLUGIN,
SQLCOM_SHOW_AUTHORS, SQLCOM_BINLOG_BASE64_EVENT,
SQLCOM_SHOW_PLUGINS,
SQLCOM_SHOW_CONTRIBUTORS,
SQLCOM_CREATE_SERVER, SQLCOM_DROP_SERVER, SQLCOM_ALTER_SERVER,
SQLCOM_CREATE_EVENT, SQLCOM_ALTER_EVENT, SQLCOM_DROP_EVENT,
SQLCOM_SHOW_CREATE_EVENT, SQLCOM_SHOW_EVENTS,
SQLCOM_SHOW_CREATE_TRIGGER,
SQLCOM_ALTER_DB_UPGRADE,
SQLCOM_SHOW_PROFILE, SQLCOM_SHOW_PROFILES,
SQLCOM_SIGNAL, SQLCOM_RESIGNAL,
SQLCOM_SHOW_RELAYLOG_EVENTS,
SQLCOM_GET_DIAGNOSTICS,
SQLCOM_SHOW_USER_STATS, SQLCOM_SHOW_TABLE_STATS, SQLCOM_SHOW_INDEX_STATS,
SQLCOM_SHOW_CLIENT_STATS,
SQLCOM_SLAVE_ALL_START, SQLCOM_SLAVE_ALL_STOP,
SQLCOM_SHOW_EXPLAIN,
/*
When a command is added here, be sure it's also added in mysqld.cc
in "struct show_var_st status_vars[]= {" ...
*/
/* This should be the last !!! */
SQLCOM_END
};
/**
@class Sql_cmd - Representation of an SQL command.
This class is an interface between the parser and the runtime.
The parser builds the appropriate derived classes of Sql_cmd
to represent a SQL statement in the parsed tree.
The execute() method in the derived classes of Sql_cmd contain the runtime
implementation.
Note that this interface is used for SQL statements recently implemented,
the code for older statements tend to load the LEX structure with more
attributes instead.
Implement new statements by sub-classing Sql_cmd, as this improves
code modularity (see the 'big switch' in dispatch_command()), and decreases
the total size of the LEX structure (therefore saving memory in stored
programs).
The recommended name of a derived class of Sql_cmd is Sql_cmd_<derived>.
Notice that the Sql_cmd class should not be confused with the
Statement class. Statement is a class that is used to manage an SQL
command or a set of SQL commands. When the SQL statement text is
analyzed, the parser will create one or more Sql_cmd objects to
represent the actual SQL commands.
*/
class Sql_cmd : public Sql_alloc
{
private:
Sql_cmd(const Sql_cmd &); // No copy constructor wanted
void operator=(Sql_cmd &); // No assignment operator wanted
public:
/**
@brief Return the command code for this statement
*/
virtual enum_sql_command sql_command_code() const = 0;
/**
Execute this SQL statement.
@param thd the current thread.
@retval false on success.
@retval true on error
*/
virtual bool execute(THD *thd) = 0;
protected:
Sql_cmd()
{}
virtual ~Sql_cmd()
{
/*
Sql_cmd objects are allocated in thd->mem_root.
In MySQL, the C++ destructor is never called, the underlying MEM_ROOT is
simply destroyed instead.
Do not rely on the destructor for any cleanup.
*/
DBUG_ASSERT(FALSE);
}
};
#endif // SQL_CMD_INCLUDED
|
