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Next part of merge. See TODO for details
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Michael Widenius
161
sql/sql_cmd.h
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161
sql/sql_cmd.h
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/* Copyright (c) 2009, 2010, Oracle and/or its affiliates. All rights reserved.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
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/**
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@file Representation of an SQL command.
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*/
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#ifndef SQL_CMD_INCLUDED
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#define SQL_CMD_INCLUDED
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/*
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When a command is added here, be sure it's also added in mysqld.cc
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in "struct show_var_st status_vars[]= {" ...
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If the command returns a result set or is not allowed in stored
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functions or triggers, please also make sure that
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sp_get_flags_for_command (sp_head.cc) returns proper flags for the
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added SQLCOM_.
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*/
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enum enum_sql_command {
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SQLCOM_SELECT, SQLCOM_CREATE_TABLE, SQLCOM_CREATE_INDEX, SQLCOM_ALTER_TABLE,
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SQLCOM_UPDATE, SQLCOM_INSERT, SQLCOM_INSERT_SELECT,
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SQLCOM_DELETE, SQLCOM_TRUNCATE, SQLCOM_DROP_TABLE, SQLCOM_DROP_INDEX,
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SQLCOM_SHOW_DATABASES, SQLCOM_SHOW_TABLES, SQLCOM_SHOW_FIELDS,
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SQLCOM_SHOW_KEYS, SQLCOM_SHOW_VARIABLES, SQLCOM_SHOW_STATUS,
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SQLCOM_SHOW_ENGINE_LOGS, SQLCOM_SHOW_ENGINE_STATUS, SQLCOM_SHOW_ENGINE_MUTEX,
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SQLCOM_SHOW_PROCESSLIST, SQLCOM_SHOW_MASTER_STAT, SQLCOM_SHOW_SLAVE_STAT,
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SQLCOM_SHOW_GRANTS, SQLCOM_SHOW_CREATE, SQLCOM_SHOW_CHARSETS,
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SQLCOM_SHOW_COLLATIONS, SQLCOM_SHOW_CREATE_DB, SQLCOM_SHOW_TABLE_STATUS,
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SQLCOM_SHOW_TRIGGERS,
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SQLCOM_LOAD,SQLCOM_SET_OPTION,SQLCOM_LOCK_TABLES,SQLCOM_UNLOCK_TABLES,
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SQLCOM_GRANT,
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SQLCOM_CHANGE_DB, SQLCOM_CREATE_DB, SQLCOM_DROP_DB, SQLCOM_ALTER_DB,
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SQLCOM_REPAIR, SQLCOM_REPLACE, SQLCOM_REPLACE_SELECT,
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SQLCOM_CREATE_FUNCTION, SQLCOM_DROP_FUNCTION,
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SQLCOM_REVOKE,SQLCOM_OPTIMIZE, SQLCOM_CHECK,
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SQLCOM_ASSIGN_TO_KEYCACHE, SQLCOM_PRELOAD_KEYS,
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SQLCOM_FLUSH, SQLCOM_KILL, SQLCOM_ANALYZE,
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SQLCOM_ROLLBACK, SQLCOM_ROLLBACK_TO_SAVEPOINT,
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SQLCOM_COMMIT, SQLCOM_SAVEPOINT, SQLCOM_RELEASE_SAVEPOINT,
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SQLCOM_SLAVE_START, SQLCOM_SLAVE_STOP,
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SQLCOM_BEGIN, SQLCOM_CHANGE_MASTER,
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SQLCOM_RENAME_TABLE,
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SQLCOM_RESET, SQLCOM_PURGE, SQLCOM_PURGE_BEFORE, SQLCOM_SHOW_BINLOGS,
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SQLCOM_SHOW_OPEN_TABLES,
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SQLCOM_HA_OPEN, SQLCOM_HA_CLOSE, SQLCOM_HA_READ,
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SQLCOM_SHOW_SLAVE_HOSTS, SQLCOM_DELETE_MULTI, SQLCOM_UPDATE_MULTI,
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SQLCOM_SHOW_BINLOG_EVENTS, SQLCOM_DO,
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SQLCOM_SHOW_WARNS, SQLCOM_EMPTY_QUERY, SQLCOM_SHOW_ERRORS,
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SQLCOM_SHOW_STORAGE_ENGINES, SQLCOM_SHOW_PRIVILEGES,
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SQLCOM_HELP, SQLCOM_CREATE_USER, SQLCOM_DROP_USER, SQLCOM_RENAME_USER,
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SQLCOM_REVOKE_ALL, SQLCOM_CHECKSUM,
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SQLCOM_CREATE_PROCEDURE, SQLCOM_CREATE_SPFUNCTION, SQLCOM_CALL,
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SQLCOM_DROP_PROCEDURE, SQLCOM_ALTER_PROCEDURE,SQLCOM_ALTER_FUNCTION,
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SQLCOM_SHOW_CREATE_PROC, SQLCOM_SHOW_CREATE_FUNC,
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SQLCOM_SHOW_STATUS_PROC, SQLCOM_SHOW_STATUS_FUNC,
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SQLCOM_PREPARE, SQLCOM_EXECUTE, SQLCOM_DEALLOCATE_PREPARE,
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SQLCOM_CREATE_VIEW, SQLCOM_DROP_VIEW,
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SQLCOM_CREATE_TRIGGER, SQLCOM_DROP_TRIGGER,
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SQLCOM_XA_START, SQLCOM_XA_END, SQLCOM_XA_PREPARE,
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SQLCOM_XA_COMMIT, SQLCOM_XA_ROLLBACK, SQLCOM_XA_RECOVER,
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SQLCOM_SHOW_PROC_CODE, SQLCOM_SHOW_FUNC_CODE,
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SQLCOM_ALTER_TABLESPACE,
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SQLCOM_INSTALL_PLUGIN, SQLCOM_UNINSTALL_PLUGIN,
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SQLCOM_SHOW_AUTHORS, SQLCOM_BINLOG_BASE64_EVENT,
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SQLCOM_SHOW_PLUGINS,
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SQLCOM_SHOW_CONTRIBUTORS,
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SQLCOM_CREATE_SERVER, SQLCOM_DROP_SERVER, SQLCOM_ALTER_SERVER,
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SQLCOM_CREATE_EVENT, SQLCOM_ALTER_EVENT, SQLCOM_DROP_EVENT,
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SQLCOM_SHOW_CREATE_EVENT, SQLCOM_SHOW_EVENTS,
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SQLCOM_SHOW_CREATE_TRIGGER,
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SQLCOM_ALTER_DB_UPGRADE,
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SQLCOM_SHOW_PROFILE, SQLCOM_SHOW_PROFILES,
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SQLCOM_SIGNAL, SQLCOM_RESIGNAL,
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SQLCOM_SHOW_RELAYLOG_EVENTS,
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SQLCOM_SHOW_USER_STATS, SQLCOM_SHOW_TABLE_STATS, SQLCOM_SHOW_INDEX_STATS,
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SQLCOM_SHOW_CLIENT_STATS,
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/*
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When a command is added here, be sure it's also added in mysqld.cc
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in "struct show_var_st status_vars[]= {" ...
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*/
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/* This should be the last !!! */
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SQLCOM_END
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};
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/**
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@class Sql_cmd - Representation of an SQL command.
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This class is an interface between the parser and the runtime.
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The parser builds the appropriate derived classes of Sql_cmd
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to represent a SQL statement in the parsed tree.
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The execute() method in the derived classes of Sql_cmd contain the runtime
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implementation.
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Note that this interface is used for SQL statements recently implemented,
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the code for older statements tend to load the LEX structure with more
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attributes instead.
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Implement new statements by sub-classing Sql_cmd, as this improves
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code modularity (see the 'big switch' in dispatch_command()), and decreases
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the total size of the LEX structure (therefore saving memory in stored
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programs).
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The recommended name of a derived class of Sql_cmd is Sql_cmd_<derived>.
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Notice that the Sql_cmd class should not be confused with the
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Statement class. Statement is a class that is used to manage an SQL
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command or a set of SQL commands. When the SQL statement text is
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analyzed, the parser will create one or more Sql_cmd objects to
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represent the actual SQL commands.
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*/
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class Sql_cmd : public Sql_alloc
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{
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private:
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Sql_cmd(const Sql_cmd &); // No copy constructor wanted
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void operator=(Sql_cmd &); // No assignment operator wanted
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public:
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/**
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@brief Return the command code for this statement
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*/
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virtual enum_sql_command sql_command_code() const = 0;
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/**
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Execute this SQL statement.
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@param thd the current thread.
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@retval false on success.
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@retval true on error
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*/
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virtual bool execute(THD *thd) = 0;
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protected:
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Sql_cmd()
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{}
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virtual ~Sql_cmd()
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{
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/*
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Sql_cmd objects are allocated in thd->mem_root.
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In MySQL, the C++ destructor is never called, the underlying MEM_ROOT is
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simply destroyed instead.
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Do not rely on the destructor for any cleanup.
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*/
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DBUG_ASSERT(FALSE);
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}
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};
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#endif // SQL_CMD_INCLUDED
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