MySQL 8.1.0
Source Code Documentation
table_session_status.h
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22
23#ifndef TABLE_SESSION_STATUS_H
24#define TABLE_SESSION_STATUS_H
25
26/**
27 @file storage/perfschema/table_session_status.h
28 Table SESSION_STATUS (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
49/**
50 A row of table
51 PERFORMANCE_SCHEMA.SESSION_STATUS.
52*/
54 /** Column THREAD_ID. */
56 /** Column VARIABLE_NAME. */
58 /** Column VARIABLE_VALUE. */
60};
61
63 public:
65 : PFS_engine_index(&m_key), m_key("VARIABLE_NAME") {}
66
67 ~PFS_index_session_status() override = default;
68
69 virtual bool match(const Status_variable *pfs);
70
71 private:
73};
74
75/** Table PERFORMANCE_SCHEMA.SESSION_STATUS. */
78
79 public:
80 /** Table share */
83 static ha_rows get_row_count();
84
85 void reset_position() override;
86
87 int rnd_init(bool scan) override;
88 int rnd_next() override;
89 int rnd_pos(const void *pos) override;
90
91 int index_init(uint idx, bool sorted) override;
92 int index_next() override;
93
94 protected:
95 int read_row_values(TABLE *table, unsigned char *buf, Field **fields,
96 bool read_all) override;
98
99 public:
100 ~table_session_status() override = default;
101
102 protected:
103 int make_row(const Status_variable *status_var);
104
105 private:
106 /** Table share lock. */
108 /** Table definition. */
110
111 /** Current THD variables. */
113 /** Current row. */
115 /** Current position. */
117 /** Next position. */
119
121};
122
123/** @} */
124#endif
Definition: field.h:575
Definition: pfs_engine_table.h:299
An abstract PERFORMANCE_SCHEMA table.
Definition: pfs_engine_table.h:69
Definition: table_session_status.h:62
PFS_index_session_status()
Definition: table_session_status.h:64
virtual bool match(const Status_variable *pfs)
Definition: table_session_status.cc:46
PFS_key_variable_name m_key
Definition: table_session_status.h:72
~PFS_index_session_status() override=default
Definition: table_helper.h:1531
Status variable cache.
Definition: pfs_variable.h:677
Class to hold information regarding a table to be created on behalf of a plugin.
Definition: plugin_table.h:39
Status variable derived from SHOW_VAR.
Definition: pfs_variable.h:207
Table PERFORMANCE_SCHEMA.SESSION_STATUS.
Definition: table_session_status.h:76
int rnd_next() override
Fetch the next row in this cursor.
Definition: table_session_status.cc:116
static PFS_engine_table_share m_share
Table share.
Definition: table_session_status.h:81
table_session_status()
Definition: table_session_status.cc:98
int index_next() override
Find key in index, read record.
Definition: table_session_status.cc:159
int make_row(const Status_variable *status_var)
Definition: table_session_status.cc:178
int read_row_values(TABLE *table, unsigned char *buf, Field **fields, bool read_all) override
Read the current row values.
Definition: table_session_status.cc:191
pos_t m_next_pos
Next position.
Definition: table_session_status.h:118
PFS_simple_index pos_t
Definition: table_session_status.h:77
void reset_position() override
Reset the cursor position to the beginning of the table.
Definition: table_session_status.cc:104
static ha_rows get_row_count()
Definition: table_session_status.cc:91
int index_init(uint idx, bool sorted) override
Definition: table_session_status.cc:147
static THR_LOCK m_table_lock
Table share lock.
Definition: table_session_status.h:107
int rnd_init(bool scan) override
Initialize table scan.
Definition: table_session_status.cc:109
row_session_status m_row
Current row.
Definition: table_session_status.h:114
~table_session_status() override=default
static Plugin_table m_table_def
Table definition.
Definition: table_session_status.h:109
PFS_status_variable_cache m_status_cache
Current THD variables.
Definition: table_session_status.h:112
int rnd_pos(const void *pos) override
Fetch a row by position.
Definition: table_session_status.cc:133
pos_t m_pos
Current position.
Definition: table_session_status.h:116
static PFS_engine_table * create(PFS_engine_table_share *)
Definition: table_session_status.cc:87
PFS_index_session_status * m_opened_index
Definition: table_session_status.h:120
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.
unsigned long long int ulonglong
Definition: my_inttypes.h:55
static PFS_engine_table_share_proxy table
Definition: pfs.cc:60
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:557
Definition: table_helper.h:1087
Definition: table_helper.h:1100
Definition: table.h:1394
Definition: thr_lock.h:138
A row of table PERFORMANCE_SCHEMA.SESSION_STATUS.
Definition: table_session_status.h:53
PFS_variable_value_row m_variable_value
Column VARIABLE_VALUE.
Definition: table_session_status.h:59
PFS_variable_name_row m_variable_name
Column VARIABLE_NAME.
Definition: table_session_status.h:57
ulonglong m_thread_internal_id
Column THREAD_ID.
Definition: table_session_status.h:55
Helpers to implement a performance schema table.