mirror of
https://github.com/MariaDB/server.git
synced 2025-01-16 03:52:35 +01:00
118 lines
3.3 KiB
C++
118 lines
3.3 KiB
C++
/* Copyright (c) 2015, 2023, Oracle and/or its affiliates.
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License, version 2.0,
|
|
as published by the Free Software Foundation.
|
|
|
|
This program is also distributed with certain software (including
|
|
but not limited to OpenSSL) that is licensed under separate terms,
|
|
as designated in a particular file or component or in included license
|
|
documentation. The authors of MySQL hereby grant you an additional
|
|
permission to link the program and your derivative works with the
|
|
separately licensed software that they have included with MySQL.
|
|
|
|
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, version 2.0, 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 */
|
|
|
|
#ifndef TABLE_GLOBAL_VARIABLES_H
|
|
#define TABLE_GLOBAL_VARIABLES_H
|
|
|
|
/**
|
|
@file storage/perfschema/table_global_variables.h
|
|
Table GLOBAL_VARIABLES (declarations).
|
|
*/
|
|
|
|
#include "pfs_column_types.h"
|
|
#include "pfs_engine_table.h"
|
|
#include "pfs_instr_class.h"
|
|
#include "pfs_instr.h"
|
|
#include "pfs_variable.h"
|
|
#include "table_helper.h"
|
|
/**
|
|
@addtogroup Performance_schema_tables
|
|
@{
|
|
*/
|
|
|
|
/**
|
|
Store and retrieve table state information during queries that reinstantiate
|
|
the table object.
|
|
*/
|
|
class table_global_variables_context : public PFS_table_context
|
|
{
|
|
public:
|
|
table_global_variables_context(ulonglong hash_version, bool restore) :
|
|
PFS_table_context(hash_version, restore, THR_PFS_VG) {}
|
|
};
|
|
|
|
/**
|
|
A row of table
|
|
PERFORMANCE_SCHEMA.GLOBAL_VARIABLES.
|
|
*/
|
|
struct row_global_variables
|
|
{
|
|
/** Column VARIABLE_NAME. */
|
|
PFS_variable_name_row m_variable_name;
|
|
/** Column VARIABLE_VALUE. */
|
|
PFS_variable_value_row m_variable_value;
|
|
};
|
|
|
|
/** Table PERFORMANCE_SCHEMA.GLOBAL_VARIABLES. */
|
|
class table_global_variables : public PFS_engine_table
|
|
{
|
|
typedef PFS_simple_index pos_t;
|
|
|
|
public:
|
|
static PFS_engine_table_share_state m_share_state;
|
|
/** Table share */
|
|
static PFS_engine_table_share m_share;
|
|
static PFS_engine_table* create();
|
|
static ha_rows get_row_count();
|
|
|
|
virtual int rnd_init(bool scan);
|
|
virtual int rnd_next();
|
|
virtual int rnd_pos(const void *pos);
|
|
virtual void reset_position(void);
|
|
|
|
protected:
|
|
virtual int read_row_values(TABLE *table,
|
|
unsigned char *buf,
|
|
Field **fields,
|
|
bool read_all);
|
|
table_global_variables();
|
|
|
|
public:
|
|
~table_global_variables()
|
|
{}
|
|
|
|
protected:
|
|
void make_row(const System_variable *system_var);
|
|
|
|
private:
|
|
/** Table share lock. */
|
|
static THR_LOCK m_table_lock;
|
|
/** Fields definition. */
|
|
static TABLE_FIELD_DEF m_field_def;
|
|
|
|
/** Current THD variables. */
|
|
PFS_system_variable_cache m_sysvar_cache;
|
|
/** Current row. */
|
|
row_global_variables m_row;
|
|
/** True if the current row exists. */
|
|
bool m_row_exists;
|
|
/** Current position. */
|
|
pos_t m_pos;
|
|
/** Next position. */
|
|
pos_t m_next_pos;
|
|
|
|
/** Table context with system variable hash version. */
|
|
table_global_variables_context *m_context;
|
|
};
|
|
|
|
/** @} */
|
|
#endif
|