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sql_class.h
5059 lines (4473 loc) · 161 KB
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sql_class.h
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/*
Copyright (c) 2000, 2016, Oracle and/or its affiliates.
Copyright (c) 2009, 2016, MariaDB
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
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 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 Street, Fifth Floor, Boston, MA 02110-1301, USA */
#ifndef SQL_CLASS_INCLUDED
#define SQL_CLASS_INCLUDED
/* Classes in mysql */
#include "my_global.h" /* NO_EMBEDDED_ACCESS_CHECKS */
#include <waiting_threads.h>
#include "sql_const.h"
#include <mysql/plugin_audit.h>
#include "log.h"
#include "rpl_tblmap.h"
#include "mdl.h"
#include "field.h" // Create_field
#include "probes_mysql.h"
#include "sql_locale.h" /* my_locale_st */
#include "sql_profile.h" /* PROFILING */
#include "scheduler.h" /* thd_scheduler */
#include "protocol.h" /* Protocol_text, Protocol_binary */
#include "violite.h" /* vio_is_connected */
#include "thr_lock.h" /* thr_lock_type, THR_LOCK_DATA,
THR_LOCK_INFO */
#include "sql_digest_stream.h" // sql_digest_state
#include <mysql/psi/mysql_stage.h>
#include <mysql/psi/mysql_statement.h>
#include <mysql/psi/mysql_idle.h>
#include <mysql/psi/mysql_table.h>
#include <mysql_com_server.h>
extern "C"
void set_thd_stage_info(void *thd,
const PSI_stage_info *new_stage,
PSI_stage_info *old_stage,
const char *calling_func,
const char *calling_file,
const unsigned int calling_line);
#define THD_STAGE_INFO(thd, stage) \
(thd)->enter_stage(& stage, NULL, __func__, __FILE__, __LINE__)
#include "my_apc.h"
#include "rpl_gtid.h"
class Reprepare_observer;
class Relay_log_info;
struct rpl_group_info;
class Rpl_filter;
class Query_log_event;
class Load_log_event;
class Slave_log_event;
class sp_rcontext;
class sp_cache;
class Lex_input_stream;
class Parser_state;
class Rows_log_event;
class Sroutine_hash_entry;
class user_var_entry;
struct Trans_binlog_info;
class rpl_io_thread_info;
class rpl_sql_thread_info;
enum enum_ha_read_modes { RFIRST, RNEXT, RPREV, RLAST, RKEY, RNEXT_SAME };
enum enum_duplicates { DUP_ERROR, DUP_REPLACE, DUP_UPDATE };
enum enum_delay_key_write { DELAY_KEY_WRITE_NONE, DELAY_KEY_WRITE_ON,
DELAY_KEY_WRITE_ALL };
enum enum_slave_exec_mode { SLAVE_EXEC_MODE_STRICT,
SLAVE_EXEC_MODE_IDEMPOTENT,
SLAVE_EXEC_MODE_LAST_BIT };
enum enum_slave_run_triggers_for_rbr { SLAVE_RUN_TRIGGERS_FOR_RBR_NO,
SLAVE_RUN_TRIGGERS_FOR_RBR_YES,
SLAVE_RUN_TRIGGERS_FOR_RBR_LOGGING};
enum enum_slave_type_conversions { SLAVE_TYPE_CONVERSIONS_ALL_LOSSY,
SLAVE_TYPE_CONVERSIONS_ALL_NON_LOSSY};
enum enum_mark_columns
{ MARK_COLUMNS_NONE, MARK_COLUMNS_READ, MARK_COLUMNS_WRITE};
enum enum_filetype { FILETYPE_CSV, FILETYPE_XML };
/* Bits for different SQL modes modes (including ANSI mode) */
#define MODE_REAL_AS_FLOAT (1ULL << 0)
#define MODE_PIPES_AS_CONCAT (1ULL << 1)
#define MODE_ANSI_QUOTES (1ULL << 2)
#define MODE_IGNORE_SPACE (1ULL << 3)
#define MODE_IGNORE_BAD_TABLE_OPTIONS (1ULL << 4)
#define MODE_ONLY_FULL_GROUP_BY (1ULL << 5)
#define MODE_NO_UNSIGNED_SUBTRACTION (1ULL << 6)
#define MODE_NO_DIR_IN_CREATE (1ULL << 7)
#define MODE_POSTGRESQL (1ULL << 8)
#define MODE_ORACLE (1ULL << 9)
#define MODE_MSSQL (1ULL << 10)
#define MODE_DB2 (1ULL << 11)
#define MODE_MAXDB (1ULL << 12)
#define MODE_NO_KEY_OPTIONS (1ULL << 13)
#define MODE_NO_TABLE_OPTIONS (1ULL << 14)
#define MODE_NO_FIELD_OPTIONS (1ULL << 15)
#define MODE_MYSQL323 (1ULL << 16)
#define MODE_MYSQL40 (1ULL << 17)
#define MODE_ANSI (1ULL << 18)
#define MODE_NO_AUTO_VALUE_ON_ZERO (1ULL << 19)
#define MODE_NO_BACKSLASH_ESCAPES (1ULL << 20)
#define MODE_STRICT_TRANS_TABLES (1ULL << 21)
#define MODE_STRICT_ALL_TABLES (1ULL << 22)
#define MODE_NO_ZERO_IN_DATE (1ULL << 23)
#define MODE_NO_ZERO_DATE (1ULL << 24)
#define MODE_INVALID_DATES (1ULL << 25)
#define MODE_ERROR_FOR_DIVISION_BY_ZERO (1ULL << 26)
#define MODE_TRADITIONAL (1ULL << 27)
#define MODE_NO_AUTO_CREATE_USER (1ULL << 28)
#define MODE_HIGH_NOT_PRECEDENCE (1ULL << 29)
#define MODE_NO_ENGINE_SUBSTITUTION (1ULL << 30)
#define MODE_PAD_CHAR_TO_FULL_LENGTH (1ULL << 31)
/* Bits for different old style modes */
#define OLD_MODE_NO_DUP_KEY_WARNINGS_WITH_IGNORE (1 << 0)
#define OLD_MODE_NO_PROGRESS_INFO (1 << 1)
#define OLD_MODE_ZERO_DATE_TIME_CAST (1 << 2)
extern char internal_table_name[2];
extern char empty_c_string[1];
extern LEX_STRING EMPTY_STR;
extern MYSQL_PLUGIN_IMPORT const char **errmesg;
extern bool volatile shutdown_in_progress;
extern "C" LEX_STRING * thd_query_string (MYSQL_THD thd);
extern "C" char **thd_query(MYSQL_THD thd);
/**
@class CSET_STRING
@brief Character set armed LEX_STRING
*/
class CSET_STRING
{
private:
LEX_STRING string;
CHARSET_INFO *cs;
public:
CSET_STRING() : cs(&my_charset_bin)
{
string.str= NULL;
string.length= 0;
}
CSET_STRING(char *str_arg, size_t length_arg, CHARSET_INFO *cs_arg) :
cs(cs_arg)
{
DBUG_ASSERT(cs_arg != NULL);
string.str= str_arg;
string.length= length_arg;
}
inline char *str() const { return string.str; }
inline uint32 length() const { return string.length; }
CHARSET_INFO *charset() const { return cs; }
friend LEX_STRING * thd_query_string (MYSQL_THD thd);
friend char **thd_query(MYSQL_THD thd);
};
#define TC_HEURISTIC_RECOVER_COMMIT 1
#define TC_HEURISTIC_RECOVER_ROLLBACK 2
extern ulong tc_heuristic_recover;
typedef struct st_user_var_events
{
user_var_entry *user_var_event;
char *value;
ulong length;
Item_result type;
uint charset_number;
bool unsigned_flag;
} BINLOG_USER_VAR_EVENT;
/*
The COPY_INFO structure is used by INSERT/REPLACE code.
The schema of the row counting by the INSERT/INSERT ... ON DUPLICATE KEY
UPDATE code:
If a row is inserted then the copied variable is incremented.
If a row is updated by the INSERT ... ON DUPLICATE KEY UPDATE and the
new data differs from the old one then the copied and the updated
variables are incremented.
The touched variable is incremented if a row was touched by the update part
of the INSERT ... ON DUPLICATE KEY UPDATE no matter whether the row
was actually changed or not.
*/
typedef struct st_copy_info {
ha_rows records; /**< Number of processed records */
ha_rows deleted; /**< Number of deleted records */
ha_rows updated; /**< Number of updated records */
ha_rows copied; /**< Number of copied records */
ha_rows error_count;
ha_rows touched; /* Number of touched records */
enum enum_duplicates handle_duplicates;
int escape_char, last_errno;
bool ignore;
/* for INSERT ... UPDATE */
List<Item> *update_fields;
List<Item> *update_values;
/* for VIEW ... WITH CHECK OPTION */
TABLE_LIST *view;
} COPY_INFO;
class Key_part_spec :public Sql_alloc {
public:
LEX_STRING field_name;
uint length;
Key_part_spec(const LEX_STRING &name, uint len)
: field_name(name), length(len)
{}
Key_part_spec(const char *name, const size_t name_len, uint len)
: length(len)
{ field_name.str= (char *)name; field_name.length= name_len; }
bool operator==(const Key_part_spec& other) const;
/**
Construct a copy of this Key_part_spec. field_name is copied
by-pointer as it is known to never change. At the same time
'length' may be reset in mysql_prepare_create_table, and this
is why we supply it with a copy.
@return If out of memory, 0 is returned and an error is set in
THD.
*/
Key_part_spec *clone(MEM_ROOT *mem_root) const
{ return new (mem_root) Key_part_spec(*this); }
};
class Alter_drop :public Sql_alloc {
public:
enum drop_type {KEY, COLUMN, FOREIGN_KEY };
const char *name;
enum drop_type type;
bool drop_if_exists;
Alter_drop(enum drop_type par_type,const char *par_name, bool par_exists)
:name(par_name), type(par_type), drop_if_exists(par_exists)
{
DBUG_ASSERT(par_name != NULL);
}
/**
Used to make a clone of this object for ALTER/CREATE TABLE
@sa comment for Key_part_spec::clone
*/
Alter_drop *clone(MEM_ROOT *mem_root) const
{ return new (mem_root) Alter_drop(*this); }
};
class Alter_column :public Sql_alloc {
public:
const char *name;
Item *def;
Alter_column(const char *par_name,Item *literal)
:name(par_name), def(literal) {}
/**
Used to make a clone of this object for ALTER/CREATE TABLE
@sa comment for Key_part_spec::clone
*/
Alter_column *clone(MEM_ROOT *mem_root) const
{ return new (mem_root) Alter_column(*this); }
};
class Key :public Sql_alloc {
public:
enum Keytype { PRIMARY, UNIQUE, MULTIPLE, FULLTEXT, SPATIAL, FOREIGN_KEY};
enum Keytype type;
KEY_CREATE_INFO key_create_info;
List<Key_part_spec> columns;
LEX_STRING name;
engine_option_value *option_list;
bool generated;
bool create_if_not_exists;
Key(enum Keytype type_par, const LEX_STRING &name_arg,
KEY_CREATE_INFO *key_info_arg,
bool generated_arg, List<Key_part_spec> &cols,
engine_option_value *create_opt, bool if_not_exists_opt)
:type(type_par), key_create_info(*key_info_arg), columns(cols),
name(name_arg), option_list(create_opt), generated(generated_arg),
create_if_not_exists(if_not_exists_opt)
{}
Key(enum Keytype type_par, const char *name_arg, size_t name_len_arg,
KEY_CREATE_INFO *key_info_arg, bool generated_arg,
List<Key_part_spec> &cols,
engine_option_value *create_opt, bool if_not_exists_opt)
:type(type_par), key_create_info(*key_info_arg), columns(cols),
option_list(create_opt), generated(generated_arg),
create_if_not_exists(if_not_exists_opt)
{
name.str= (char *)name_arg;
name.length= name_len_arg;
}
Key(const Key &rhs, MEM_ROOT *mem_root);
virtual ~Key() {}
/* Equality comparison of keys (ignoring name) */
friend bool foreign_key_prefix(Key *a, Key *b);
/**
Used to make a clone of this object for ALTER/CREATE TABLE
@sa comment for Key_part_spec::clone
*/
virtual Key *clone(MEM_ROOT *mem_root) const
{ return new (mem_root) Key(*this, mem_root); }
};
class Foreign_key: public Key {
public:
enum fk_match_opt { FK_MATCH_UNDEF, FK_MATCH_FULL,
FK_MATCH_PARTIAL, FK_MATCH_SIMPLE};
enum fk_option { FK_OPTION_UNDEF, FK_OPTION_RESTRICT, FK_OPTION_CASCADE,
FK_OPTION_SET_NULL, FK_OPTION_NO_ACTION, FK_OPTION_DEFAULT};
LEX_STRING ref_db;
LEX_STRING ref_table;
List<Key_part_spec> ref_columns;
uint delete_opt, update_opt, match_opt;
Foreign_key(const LEX_STRING &name_arg, List<Key_part_spec> &cols,
const LEX_STRING &ref_db_arg, const LEX_STRING &ref_table_arg,
List<Key_part_spec> &ref_cols,
uint delete_opt_arg, uint update_opt_arg, uint match_opt_arg,
bool if_not_exists_opt)
:Key(FOREIGN_KEY, name_arg, &default_key_create_info, 0, cols, NULL,
if_not_exists_opt),
ref_db(ref_db_arg), ref_table(ref_table_arg), ref_columns(ref_cols),
delete_opt(delete_opt_arg), update_opt(update_opt_arg),
match_opt(match_opt_arg)
{
// We don't check for duplicate FKs.
key_create_info.check_for_duplicate_indexes= false;
}
Foreign_key(const Foreign_key &rhs, MEM_ROOT *mem_root);
/**
Used to make a clone of this object for ALTER/CREATE TABLE
@sa comment for Key_part_spec::clone
*/
virtual Key *clone(MEM_ROOT *mem_root) const
{ return new (mem_root) Foreign_key(*this, mem_root); }
/* Used to validate foreign key options */
bool validate(List<Create_field> &table_fields);
};
typedef struct st_mysql_lock
{
TABLE **table;
uint table_count,lock_count;
THR_LOCK_DATA **locks;
} MYSQL_LOCK;
class LEX_COLUMN : public Sql_alloc
{
public:
String column;
uint rights;
LEX_COLUMN (const String& x,const uint& y ): column (x),rights (y) {}
};
class MY_LOCALE;
/**
Query_cache_tls -- query cache thread local data.
*/
struct Query_cache_block;
struct Query_cache_tls
{
/*
'first_query_block' should be accessed only via query cache
functions and methods to maintain proper locking.
*/
Query_cache_block *first_query_block;
void set_first_query_block(Query_cache_block *first_query_block_arg)
{
first_query_block= first_query_block_arg;
}
Query_cache_tls() :first_query_block(NULL) {}
};
/* SIGNAL / RESIGNAL / GET DIAGNOSTICS */
/**
This enumeration list all the condition item names of a condition in the
SQL condition area.
*/
typedef enum enum_diag_condition_item_name
{
/*
Conditions that can be set by the user (SIGNAL/RESIGNAL),
and by the server implementation.
*/
DIAG_CLASS_ORIGIN= 0,
FIRST_DIAG_SET_PROPERTY= DIAG_CLASS_ORIGIN,
DIAG_SUBCLASS_ORIGIN= 1,
DIAG_CONSTRAINT_CATALOG= 2,
DIAG_CONSTRAINT_SCHEMA= 3,
DIAG_CONSTRAINT_NAME= 4,
DIAG_CATALOG_NAME= 5,
DIAG_SCHEMA_NAME= 6,
DIAG_TABLE_NAME= 7,
DIAG_COLUMN_NAME= 8,
DIAG_CURSOR_NAME= 9,
DIAG_MESSAGE_TEXT= 10,
DIAG_MYSQL_ERRNO= 11,
LAST_DIAG_SET_PROPERTY= DIAG_MYSQL_ERRNO
} Diag_condition_item_name;
/**
Name of each diagnostic condition item.
This array is indexed by Diag_condition_item_name.
*/
extern const LEX_STRING Diag_condition_item_names[];
/**
These states are bit coded with HARD. For each state there must be a pair
<state_even_num>, and <state_odd_num>_HARD.
*/
enum killed_state
{
NOT_KILLED= 0,
KILL_HARD_BIT= 1, /* Bit for HARD KILL */
KILL_BAD_DATA= 2,
KILL_BAD_DATA_HARD= 3,
KILL_QUERY= 4,
KILL_QUERY_HARD= 5,
/*
ABORT_QUERY signals to the query processor to stop execution ASAP without
issuing an error. Instead a warning is issued, and when possible a partial
query result is returned to the client.
*/
ABORT_QUERY= 6,
ABORT_QUERY_HARD= 7,
/*
All of the following killed states will kill the connection
KILL_CONNECTION must be the first of these and it must start with
an even number (becasue of HARD bit)!
*/
KILL_CONNECTION= 8,
KILL_CONNECTION_HARD= 9,
KILL_SYSTEM_THREAD= 10,
KILL_SYSTEM_THREAD_HARD= 11,
KILL_SERVER= 12,
KILL_SERVER_HARD= 13
};
extern int killed_errno(killed_state killed);
#define killed_mask_hard(killed) ((killed_state) ((killed) & ~KILL_HARD_BIT))
enum killed_type
{
KILL_TYPE_ID,
KILL_TYPE_USER,
KILL_TYPE_QUERY
};
#include "sql_lex.h" /* Must be here */
extern LEX_STRING sql_statement_names[(uint) SQLCOM_END + 1];
class Delayed_insert;
class select_result;
class Time_zone;
#define THD_SENTRY_MAGIC 0xfeedd1ff
#define THD_SENTRY_GONE 0xdeadbeef
#define THD_CHECK_SENTRY(thd) DBUG_ASSERT(thd->dbug_sentry == THD_SENTRY_MAGIC)
typedef ulonglong sql_mode_t;
typedef struct system_variables
{
/*
How dynamically allocated system variables are handled:
The global_system_variables and max_system_variables are "authoritative"
They both should have the same 'version' and 'size'.
When attempting to access a dynamic variable, if the session version
is out of date, then the session version is updated and realloced if
neccessary and bytes copied from global to make up for missing data.
Note that one should use my_bool instead of bool here, as the variables
are used with my_getopt.c
*/
ulong dynamic_variables_version;
char* dynamic_variables_ptr;
uint dynamic_variables_head; /* largest valid variable offset */
uint dynamic_variables_size; /* how many bytes are in use */
ulonglong max_heap_table_size;
ulonglong tmp_table_size;
ulonglong long_query_time;
ulonglong optimizer_switch;
sql_mode_t sql_mode; ///< which non-standard SQL behaviour should be enabled
sql_mode_t old_behavior; ///< which old SQL behaviour should be enabled
ulonglong option_bits; ///< OPTION_xxx constants, e.g. OPTION_PROFILING
ulonglong join_buff_space_limit;
ulonglong log_slow_filter;
ulonglong log_slow_verbosity;
ulonglong bulk_insert_buff_size;
ulonglong join_buff_size;
ulonglong sortbuff_size;
ulonglong group_concat_max_len;
ulonglong default_regex_flags;
/**
Place holders to store Multi-source variables in sys_var.cc during
update and show of variables.
*/
ulonglong slave_skip_counter;
ulonglong max_relay_log_size;
ha_rows select_limit;
ha_rows max_join_size;
ha_rows expensive_subquery_limit;
ulong auto_increment_increment, auto_increment_offset;
ulong lock_wait_timeout;
ulong join_cache_level;
ulong max_allowed_packet;
ulong max_error_count;
ulong max_length_for_sort_data;
ulong max_sort_length;
ulong max_tmp_tables;
ulong max_insert_delayed_threads;
ulong min_examined_row_limit;
ulong multi_range_count;
ulong net_buffer_length;
ulong net_interactive_timeout;
ulong net_read_timeout;
ulong net_retry_count;
ulong net_wait_timeout;
ulong net_write_timeout;
ulong optimizer_prune_level;
ulong optimizer_search_depth;
ulong optimizer_selectivity_sampling_limit;
ulong optimizer_use_condition_selectivity;
ulong use_stat_tables;
ulong histogram_size;
ulong histogram_type;
ulong preload_buff_size;
ulong profiling_history_size;
ulong read_buff_size;
ulong read_rnd_buff_size;
ulong mrr_buff_size;
ulong div_precincrement;
/* Total size of all buffers used by the subselect_rowid_merge_engine. */
ulong rowid_merge_buff_size;
ulong max_sp_recursion_depth;
ulong default_week_format;
ulong max_seeks_for_key;
ulong range_alloc_block_size;
ulong query_alloc_block_size;
ulong query_prealloc_size;
ulong trans_alloc_block_size;
ulong trans_prealloc_size;
ulong log_warnings;
/* Flags for slow log filtering */
ulong log_slow_rate_limit;
ulong binlog_format; ///< binlog format for this thd (see enum_binlog_format)
ulong progress_report_time;
my_bool binlog_annotate_row_events;
my_bool binlog_direct_non_trans_update;
my_bool sql_log_bin;
ulong completion_type;
ulong query_cache_type;
ulong tx_isolation;
ulong updatable_views_with_limit;
int max_user_connections;
ulong server_id;
/**
In slave thread we need to know in behalf of which
thread the query is being run to replicate temp tables properly
*/
my_thread_id pseudo_thread_id;
/**
When replicating an event group with GTID, keep these values around so
slave binlog can receive the same GTID as the original.
*/
uint32 gtid_domain_id;
uint64 gtid_seq_no;
/**
Default transaction access mode. READ ONLY (true) or READ WRITE (false).
*/
my_bool tx_read_only;
my_bool low_priority_updates;
my_bool query_cache_wlock_invalidate;
my_bool engine_condition_pushdown;
my_bool keep_files_on_create;
my_bool old_mode;
my_bool old_alter_table;
my_bool old_passwords;
my_bool big_tables;
my_bool query_cache_strip_comments;
plugin_ref table_plugin;
/* Only charset part of these variables is sensible */
CHARSET_INFO *character_set_filesystem;
CHARSET_INFO *character_set_client;
CHARSET_INFO *character_set_results;
/* Both charset and collation parts of these variables are important */
CHARSET_INFO *collation_server;
CHARSET_INFO *collation_database;
CHARSET_INFO *collation_connection;
/* Names. These will be allocated in buffers in thd */
LEX_STRING default_master_connection;
/* Error messages */
MY_LOCALE *lc_messages;
/* Locale Support */
MY_LOCALE *lc_time_names;
Time_zone *time_zone;
my_bool sysdate_is_now;
/* deadlock detection */
ulong wt_timeout_short, wt_deadlock_search_depth_short;
ulong wt_timeout_long, wt_deadlock_search_depth_long;
double long_query_time_double;
my_bool pseudo_slave_mode;
} SV;
/**
Per thread status variables.
Must be long/ulong up to last_system_status_var so that
add_to_status/add_diff_to_status can work.
*/
typedef struct system_status_var
{
ulong com_other;
ulong com_stat[(uint) SQLCOM_END];
ulong com_register_slave;
ulong created_tmp_disk_tables_;
ulong created_tmp_tables_;
ulong ha_commit_count;
ulong ha_delete_count;
ulong ha_read_first_count;
ulong ha_read_last_count;
ulong ha_read_key_count;
ulong ha_read_next_count;
ulong ha_read_prev_count;
ulong ha_read_rnd_count;
ulong ha_read_rnd_next_count;
ulong ha_read_rnd_deleted_count;
/*
This number doesn't include calls to the default implementation and
calls made by range access. The intent is to count only calls made by
BatchedKeyAccess.
*/
ulong ha_mrr_init_count;
ulong ha_mrr_key_refills_count;
ulong ha_mrr_rowid_refills_count;
ulong ha_rollback_count;
ulong ha_update_count;
ulong ha_write_count;
/* The following are for internal temporary tables */
ulong ha_tmp_update_count;
ulong ha_tmp_write_count;
ulong ha_prepare_count;
ulong ha_icp_attempts;
ulong ha_icp_match;
ulong ha_discover_count;
ulong ha_savepoint_count;
ulong ha_savepoint_rollback_count;
ulong ha_external_lock_count;
ulong net_big_packet_count;
ulong opened_tables;
ulong opened_shares;
ulong opened_views; /* +1 opening a view */
ulong select_full_join_count_;
ulong select_full_range_join_count_;
ulong select_range_count_;
ulong select_range_check_count_;
ulong select_scan_count_;
ulong executed_triggers;
ulong long_query_count;
ulong filesort_merge_passes_;
ulong filesort_range_count_;
ulong filesort_rows_;
ulong filesort_scan_count_;
ulong filesort_pq_sorts_;
/* Prepared statements and binary protocol */
ulong com_stmt_prepare;
ulong com_stmt_reprepare;
ulong com_stmt_execute;
ulong com_stmt_send_long_data;
ulong com_stmt_fetch;
ulong com_stmt_reset;
ulong com_stmt_close;
/* Features used */
ulong feature_dynamic_columns; /* +1 when creating a dynamic column */
ulong feature_fulltext; /* +1 when MATCH is used */
ulong feature_gis; /* +1 opening a table with GIS features */
ulong feature_locale; /* +1 when LOCALE is set */
ulong feature_subquery; /* +1 when subqueries are used */
ulong feature_timezone; /* +1 when XPATH is used */
ulong feature_trigger; /* +1 opening a table with triggers */
ulong feature_xml; /* +1 when XPATH is used */
ulong empty_queries;
ulong access_denied_errors;
ulong lost_connections;
/*
Number of statements sent from the client
*/
ulong questions;
/*
IMPORTANT!
SEE last_system_status_var DEFINITION BELOW.
Below 'last_system_status_var' are all variables that cannot be handled
automatically by add_to_status()/add_diff_to_status().
*/
ulonglong bytes_received;
ulonglong bytes_sent;
ulonglong rows_read;
ulonglong rows_sent;
ulonglong rows_tmp_read;
ulonglong binlog_bytes_written;
double last_query_cost;
double cpu_time, busy_time;
/* Don't initialize */
volatile int64 memory_used; /* This shouldn't be accumulated */
} STATUS_VAR;
/*
This is used for 'SHOW STATUS'. It must be updated to the last ulong
variable in system_status_var which is makes sense to add to the global
counter
*/
#define last_system_status_var questions
#define last_cleared_system_status_var memory_used
/*
Global status variables
*/
extern ulong feature_files_opened_with_delayed_keys;
void add_to_status(STATUS_VAR *to_var, STATUS_VAR *from_var);
void add_diff_to_status(STATUS_VAR *to_var, STATUS_VAR *from_var,
STATUS_VAR *dec_var);
/**
Get collation by name, send error to client on failure.
@param name Collation name
@param name_cs Character set of the name string
@return
@retval NULL on error
@retval Pointter to CHARSET_INFO with the given name on success
*/
inline CHARSET_INFO *
mysqld_collation_get_by_name(const char *name,
CHARSET_INFO *name_cs= system_charset_info)
{
CHARSET_INFO *cs;
MY_CHARSET_LOADER loader;
my_charset_loader_init_mysys(&loader);
if (!(cs= my_collation_get_by_name(&loader, name, MYF(0))))
{
ErrConvString err(name, name_cs);
my_error(ER_UNKNOWN_COLLATION, MYF(0), err.ptr());
if (loader.error[0])
push_warning_printf(current_thd,
Sql_condition::WARN_LEVEL_WARN,
ER_UNKNOWN_COLLATION, "%s", loader.error);
}
return cs;
}
#ifdef MYSQL_SERVER
void free_tmp_table(THD *thd, TABLE *entry);
/* The following macro is to make init of Query_arena simpler */
#ifndef DBUG_OFF
#define INIT_ARENA_DBUG_INFO is_backup_arena= 0; is_reprepared= FALSE;
#else
#define INIT_ARENA_DBUG_INFO
#endif
class Query_arena
{
public:
/*
List of items created in the parser for this query. Every item puts
itself to the list on creation (see Item::Item() for details))
*/
Item *free_list;
MEM_ROOT *mem_root; // Pointer to current memroot
#ifndef DBUG_OFF
bool is_backup_arena; /* True if this arena is used for backup. */
bool is_reprepared;
#endif
/*
The states relfects three diffrent life cycles for three
different types of statements:
Prepared statement: STMT_INITIALIZED -> STMT_PREPARED -> STMT_EXECUTED.
Stored procedure: STMT_INITIALIZED_FOR_SP -> STMT_EXECUTED.
Other statements: STMT_CONVENTIONAL_EXECUTION never changes.
*/
enum enum_state
{
STMT_INITIALIZED= 0, STMT_INITIALIZED_FOR_SP= 1, STMT_PREPARED= 2,
STMT_CONVENTIONAL_EXECUTION= 3, STMT_EXECUTED= 4, STMT_ERROR= -1
};
enum_state state;
/* We build without RTTI, so dynamic_cast can't be used. */
enum Type
{
STATEMENT, PREPARED_STATEMENT, STORED_PROCEDURE
};
Query_arena(MEM_ROOT *mem_root_arg, enum enum_state state_arg) :
free_list(0), mem_root(mem_root_arg), state(state_arg)
{ INIT_ARENA_DBUG_INFO; }
/*
This constructor is used only when Query_arena is created as
backup storage for another instance of Query_arena.
*/
Query_arena() { INIT_ARENA_DBUG_INFO; }
virtual Type type() const;
virtual ~Query_arena() {};
inline bool is_stmt_prepare() const { return state == STMT_INITIALIZED; }
inline bool is_stmt_prepare_or_first_sp_execute() const
{ return (int)state < (int)STMT_PREPARED; }
inline bool is_stmt_prepare_or_first_stmt_execute() const
{ return (int)state <= (int)STMT_PREPARED; }
inline bool is_stmt_execute() const
{ return state == STMT_PREPARED || state == STMT_EXECUTED; }
inline bool is_conventional() const
{ return state == STMT_CONVENTIONAL_EXECUTION; }
inline void* alloc(size_t size) { return alloc_root(mem_root,size); }
inline void* calloc(size_t size)
{
void *ptr;
if ((ptr=alloc_root(mem_root,size)))
bzero(ptr, size);
return ptr;
}
inline char *strdup(const char *str)
{ return strdup_root(mem_root,str); }
inline char *strmake(const char *str, size_t size)
{ return strmake_root(mem_root,str,size); }
inline void *memdup(const void *str, size_t size)
{ return memdup_root(mem_root,str,size); }
inline void *memdup_w_gap(const void *str, size_t size, uint gap)
{
void *ptr;
if ((ptr= alloc_root(mem_root,size+gap)))
memcpy(ptr,str,size);
return ptr;
}
void set_query_arena(Query_arena *set);
void free_items();
/* Close the active state associated with execution of this statement */
virtual void cleanup_stmt();
};
class Server_side_cursor;
/**
@class Statement
@brief State of a single command executed against this connection.
One connection can contain a lot of simultaneously running statements,
some of which could be:
- prepared, that is, contain placeholders,
- opened as cursors. We maintain 1 to 1 relationship between
statement and cursor - if user wants to create another cursor for his
query, we create another statement for it.
To perform some action with statement we reset THD part to the state of
that statement, do the action, and then save back modified state from THD
to the statement. It will be changed in near future, and Statement will
be used explicitly.
*/
class Statement: public ilink, public Query_arena
{
Statement(const Statement &rhs); /* not implemented: */
Statement &operator=(const Statement &rhs); /* non-copyable */
public:
/*
Uniquely identifies each statement object in thread scope; change during
statement lifetime. FIXME: must be const
*/
ulong id;
/*
MARK_COLUMNS_NONE: Means mark_used_colums is not set and no indicator to
handler of fields used is set
MARK_COLUMNS_READ: Means a bit in read set is set to inform handler
that the field is to be read. If field list contains
duplicates, then thd->dup_field is set to point
to the last found duplicate.
MARK_COLUMNS_WRITE: Means a bit is set in write set to inform handler
that it needs to update this field in write_row
and update_row.
*/
enum enum_mark_columns mark_used_columns;
LEX_STRING name; /* name for named prepared statements */
LEX *lex; // parse tree descriptor
/*
Points to the query associated with this statement. It's const, but
we need to declare it char * because all table handlers are written
in C and need to point to it.
Note that if we set query = NULL, we must at the same time set
query_length = 0, and protect the whole operation with
LOCK_thd_data mutex. To avoid crashes in races, if we do not
know that thd->query cannot change at the moment, we should print
thd->query like this:
(1) reserve the LOCK_thd_data mutex;
(2) print or copy the value of query and query_length
(3) release LOCK_thd_data mutex.
This printing is needed at least in SHOW PROCESSLIST and SHOW
ENGINE INNODB STATUS.
*/
CSET_STRING query_string;
/*
If opt_query_cache_strip_comments is set, this contains query without
comments. If not set, it contains pointer to query_string.
*/
String base_query;
inline char *query() const { return query_string.str(); }
inline uint32 query_length() const { return query_string.length(); }
CHARSET_INFO *query_charset() const { return query_string.charset(); }
void set_query_inner(const CSET_STRING &string_arg)
{
query_string= string_arg;
}
void set_query_inner(char *query_arg, uint32 query_length_arg,
CHARSET_INFO *cs_arg)
{
set_query_inner(CSET_STRING(query_arg, query_length_arg, cs_arg));
}
void reset_query_inner()
{
set_query_inner(CSET_STRING());
}
/**
Name of the current (default) database.
If there is the current (default) database, "db" contains its name. If
there is no current (default) database, "db" is NULL and "db_length" is
0. In other words, "db", "db_length" must either be NULL, or contain a
valid database name.
@note this attribute is set and alloced by the slave SQL thread (for
the THD of that thread); that thread is (and must remain, for now) the
only responsible for freeing this member.
*/
char *db;
size_t db_length;