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