MySQL 8.0.29
Source Code Documentation
table_global_variables.h
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22
23#ifndef TABLE_GLOBAL_VARIABLES_H
24#define TABLE_GLOBAL_VARIABLES_H
25
26/**
27 @file storage/perfschema/table_global_variables.h
28 Table GLOBAL_VARIABLES (declarations).
29*/
30
31#include <sys/types.h>
32
33#include "my_base.h"
34#include "my_inttypes.h"
39
40class Field;
41class Plugin_table;
42struct TABLE;
43struct THR_LOCK;
44/**
45 @addtogroup performance_schema_tables
46 @{
47*/
48
50 public:
52 : PFS_engine_index(&m_key), m_key("VARIABLE_NAME") {}
53
54 ~PFS_index_global_variables() override = default;
55
56 virtual bool match(const System_variable *pfs);
57
58 private:
60};
61
62/**
63 A row of table
64 PERFORMANCE_SCHEMA.GLOBAL_VARIABLES.
65*/
67 /** Column VARIABLE_NAME. */
69 /** Column VARIABLE_VALUE. */
71};
72
73/** Table PERFORMANCE_SCHEMA.GLOBAL_VARIABLES. */
76
77 public:
78 /** Table share */
81 static ha_rows get_row_count();
82
83 void reset_position(void) override;
84
85 int rnd_init(bool scan) override;
86 int rnd_next() override;
87 int rnd_pos(const void *pos) override;
88
89 int index_init(uint idx, bool sorted) override;
90 int index_next() override;
91
92 protected:
93 int read_row_values(TABLE *table, unsigned char *buf, Field **fields,
94 bool read_all) override;
96
97 public:
98 ~table_global_variables() override = default;
99
100 protected:
101 int make_row(const System_variable *system_var);
102
103 private:
104 /** Table share lock. */
106 /** Table definition. */
108
109 /** Current THD variables. */
111 /** Current row. */
113 /** Current position. */
115 /** Next position. */
117
119};
120
121/** @} */
122#endif
Definition: field.h:573
Definition: pfs_engine_table.h:299
An abstract PERFORMANCE_SCHEMA table.
Definition: pfs_engine_table.h:69
Definition: table_global_variables.h:49
PFS_key_variable_name m_key
Definition: table_global_variables.h:59
~PFS_index_global_variables() override=default
PFS_index_global_variables()
Definition: table_global_variables.h:51
virtual bool match(const System_variable *pfs)
Definition: table_global_variables.cc:47
Definition: table_helper.h:1531
System variable cache.
Definition: pfs_variable.h:607
Class to hold information regarding a table to be created on behalf of a plugin.
Definition: plugin_table.h:39
System variable derived from sys_var object.
Definition: pfs_variable.h:170
Table PERFORMANCE_SCHEMA.GLOBAL_VARIABLES.
Definition: table_global_variables.h:74
int rnd_init(bool scan) override
Initialize table scan.
Definition: table_global_variables.cc:113
int rnd_pos(const void *pos) override
Fetch a row by position.
Definition: table_global_variables.cc:135
int rnd_next() override
Fetch the next row in this cursor.
Definition: table_global_variables.cc:123
int index_init(uint idx, bool sorted) override
Definition: table_global_variables.cc:146
static Plugin_table m_table_def
Table definition.
Definition: table_global_variables.h:107
pos_t m_pos
Current position.
Definition: table_global_variables.h:114
PFS_simple_index pos_t
Definition: table_global_variables.h:75
PFS_index_global_variables * m_opened_index
Definition: table_global_variables.h:118
static THR_LOCK m_table_lock
Table share lock.
Definition: table_global_variables.h:105
int make_row(const System_variable *system_var)
Definition: table_global_variables.cc:178
int read_row_values(TABLE *table, unsigned char *buf, Field **fields, bool read_all) override
Read the current row values.
Definition: table_global_variables.cc:198
int index_next() override
Find key in index, read record.
Definition: table_global_variables.cc:162
PFS_system_variable_cache m_sysvar_cache
Current THD variables.
Definition: table_global_variables.h:110
table_global_variables()
Definition: table_global_variables.cc:102
row_global_variables m_row
Current row.
Definition: table_global_variables.h:112
~table_global_variables() override=default
void reset_position(void) override
Reset the cursor position to the beginning of the table.
Definition: table_global_variables.cc:108
static PFS_engine_table * create(PFS_engine_table_share *)
Definition: table_global_variables.cc:88
pos_t m_next_pos
Next position.
Definition: table_global_variables.h:116
static ha_rows get_row_count()
Definition: table_global_variables.cc:92
static PFS_engine_table_share m_share
Table share.
Definition: table_global_variables.h:79
char * pos
Definition: do_ctype.cc:76
This file includes constants used by all storage engines.
my_off_t ha_rows
Definition: my_base.h:1139
Some integer typedefs for easier portability.
Definition: buf0block_hint.cc:29
Performance schema tables (declarations).
Performance schema system and status variables (declarations).
static const LEX_CSTRING pfs
Definition: sql_show_processlist.cc:65
Performance schema instrumentation (declarations).
A PERFORMANCE_SCHEMA table share.
Definition: pfs_engine_table.h:357
Position of a cursor, for simple iterations.
Definition: pfs_engine_table.h:558
Definition: table_helper.h:1086
Definition: table_helper.h:1099
Definition: table.h:1394
Definition: thr_lock.h:138
A row of table PERFORMANCE_SCHEMA.GLOBAL_VARIABLES.
Definition: table_global_variables.h:66
PFS_variable_value_row m_variable_value
Column VARIABLE_VALUE.
Definition: table_global_variables.h:70
PFS_variable_name_row m_variable_name
Column VARIABLE_NAME.
Definition: table_global_variables.h:68
Helpers to implement a performance schema table.
unsigned int uint
Definition: uca-dump.cc:29