97
142
List<Item> *update_fields;
98
143
List<Item> *update_values;
99
144
/* for VIEW ... WITH CHECK OPTION */
106
typedef struct st_mysql_lock
109
uint32_t table_count,lock_count;
110
THR_LOCK_DATA **locks;
114
class LEX_COLUMN : public Sql_alloc
119
LEX_COLUMN (const String& x,const uint& y ): column (x),rights (y) {}
162
} /* namespace drizzled */
164
/** @TODO why is this in the middle of the file */
165
#include <drizzled/lex_column.h>
122
170
class select_result;
125
173
#define Session_SENTRY_MAGIC 0xfeedd1ff
126
174
#define Session_SENTRY_GONE 0xdeadbeef
128
#define Session_CHECK_SENTRY(session) assert(session->dbug_sentry == Session_SENTRY_MAGIC)
130
struct system_variables
176
struct drizzle_system_variables
178
drizzle_system_variables()
133
181
How dynamically allocated system variables are handled:
135
183
The global_system_variables and max_system_variables are "authoritative"
136
184
They both should have the same 'version' and 'size'.
137
185
When attempting to access a dynamic variable, if the session version
138
186
is out of date, then the session version is updated and realloced if
139
187
neccessary and bytes copied from global to make up for missing data.
141
189
ulong dynamic_variables_version;
142
char* dynamic_variables_ptr;
190
char * dynamic_variables_ptr;
143
191
uint32_t dynamic_variables_head; /* largest valid variable offset */
144
192
uint32_t dynamic_variables_size; /* how many bytes are in use */
146
194
uint64_t myisam_max_extra_sort_file_size;
147
uint64_t myisam_max_sort_file_size;
148
195
uint64_t max_heap_table_size;
149
196
uint64_t tmp_table_size;
150
197
ha_rows select_limit;
151
198
ha_rows max_join_size;
152
uint32_t auto_increment_increment;
153
uint32_t auto_increment_offset;
199
uint64_t auto_increment_increment;
200
uint64_t auto_increment_offset;
154
201
uint64_t bulk_insert_buff_size;
155
202
uint64_t join_buff_size;
156
203
uint32_t max_allowed_packet;
157
204
uint64_t max_error_count;
158
205
uint64_t max_length_for_sort_data;
159
uint64_t max_sort_length;
160
uint64_t max_tmp_tables;
206
size_t max_sort_length;
161
207
uint64_t min_examined_row_limit;
162
uint32_t myisam_repair_threads;
163
uint64_t myisam_sort_buff_size;
164
uint32_t myisam_stats_method;
165
uint32_t net_buffer_length;
166
uint32_t net_interactive_timeout;
167
uint32_t net_read_timeout;
168
uint32_t net_retry_count;
169
uint32_t net_wait_timeout;
170
uint32_t net_write_timeout;
171
208
bool optimizer_prune_level;
172
211
uint32_t optimizer_search_depth;
174
Controls use of Engine-MRR:
175
0 - auto, based on cost
176
1 - force MRR when the storage engine is capable of doing it
179
uint32_t optimizer_use_mrr;
180
/* A bitmap for switching optimizations on/off */
181
uint32_t optimizer_switch;
212
uint32_t div_precincrement;
182
213
uint64_t preload_buff_size;
183
214
uint32_t read_buff_size;
184
215
uint32_t read_rnd_buff_size;
185
uint32_t div_precincrement;
186
uint64_t sortbuff_size;
216
bool replicate_query;
217
size_t sortbuff_size;
187
218
uint32_t thread_handling;
188
219
uint32_t tx_isolation;
220
size_t transaction_message_threshold;
189
221
uint32_t completion_type;
190
222
/* Determines which non-standard SQL behaviour should be enabled */
191
223
uint32_t sql_mode;
192
uint32_t default_week_format;
193
224
uint64_t max_seeks_for_key;
194
uint64_t range_alloc_block_size;
225
size_t range_alloc_block_size;
195
226
uint32_t query_alloc_block_size;
196
227
uint32_t query_prealloc_size;
197
uint32_t trans_alloc_block_size;
198
uint32_t trans_prealloc_size;
200
228
uint64_t group_concat_max_len;
202
In slave thread we need to know in behalf of which
203
thread the query is being run to replicate temp tables properly
205
/* TODO: change this to my_thread_id - but have to fix set_var first */
206
229
uint64_t pseudo_thread_id;
208
bool low_priority_updates;
211
compatibility option:
212
- index usage hints (USE INDEX without a FOR clause) behave as in 5.0
215
bool engine_condition_pushdown;
216
bool keep_files_on_create;
218
bool old_alter_table;
220
plugin_ref table_plugin;
231
plugin::StorageEngine *storage_engine;
222
233
/* Only charset part of these variables is sensible */
223
234
const CHARSET_INFO *character_set_filesystem;
224
const CHARSET_INFO *character_set_client;
225
const CHARSET_INFO *character_set_results;
227
236
/* Both charset and collation parts of these variables are important */
228
237
const CHARSET_INFO *collation_server;
229
const CHARSET_INFO *collation_database;
230
const CHARSET_INFO *collation_connection;
239
inline const CHARSET_INFO *getCollation(void)
241
return collation_server;
232
244
/* Locale Support */
233
245
MY_LOCALE *lc_time_names;
235
247
Time_zone *time_zone;
237
/* DATE, DATETIME and DRIZZLE_TIME formats */
238
DATE_TIME_FORMAT *date_format;
239
DATE_TIME_FORMAT *datetime_format;
240
DATE_TIME_FORMAT *time_format;
245
extern struct system_variables global_system_variables;
247
#include "sql_lex.h" /* only for SQLCOM_END */
249
/* per thread status variables */
251
typedef struct system_status_var
250
extern struct drizzle_system_variables global_system_variables;
252
} /* namespace drizzled */
254
#include "drizzled/sql_lex.h"
253
uint64_t bytes_received;
256
ulong com_stat[(uint) SQLCOM_END];
257
ulong created_tmp_disk_tables;
258
ulong created_tmp_tables;
259
ulong ha_commit_count;
260
ulong ha_delete_count;
261
ulong ha_read_first_count;
262
ulong ha_read_last_count;
263
ulong ha_read_key_count;
264
ulong ha_read_next_count;
265
ulong ha_read_prev_count;
266
ulong ha_read_rnd_count;
267
ulong ha_read_rnd_next_count;
268
ulong ha_rollback_count;
269
ulong ha_update_count;
270
ulong ha_write_count;
271
ulong ha_prepare_count;
272
ulong ha_discover_count;
273
ulong ha_savepoint_count;
274
ulong ha_savepoint_rollback_count;
276
/* KEY_CACHE parts. These are copies of the original */
277
ulong key_blocks_changed;
278
ulong key_blocks_used;
279
ulong key_cache_r_requests;
280
ulong key_cache_read;
281
ulong key_cache_w_requests;
282
ulong key_cache_write;
283
/* END OF KEY_CACHE parts */
285
ulong net_big_packet_count;
288
ulong select_full_join_count;
289
ulong select_full_range_join_count;
290
ulong select_range_count;
291
ulong select_range_check_count;
292
ulong select_scan_count;
293
ulong long_query_count;
294
ulong filesort_merge_passes;
295
ulong filesort_range_count;
297
ulong filesort_scan_count;
298
/* Prepared statements and binary protocol */
299
ulong com_stmt_prepare;
300
ulong com_stmt_execute;
301
ulong com_stmt_send_long_data;
302
ulong com_stmt_fetch;
303
ulong com_stmt_reset;
304
ulong com_stmt_close;
306
Number of statements sent from the client
312
SEE last_system_status_var DEFINITION BELOW.
314
Below 'last_system_status_var' are all variables which doesn't make any
315
sense to add to the /global/ status variable counter.
317
double last_query_cost;
323
This is used for 'SHOW STATUS'. It must be updated to the last ulong
324
variable in system_status_var which is makes sens to add to the global
328
#define last_system_status_var questions
330
259
void mark_transaction_to_rollback(Session *session, bool all);
332
#ifdef DRIZZLE_SERVER
262
Storage engine specific thread local data.
338
List of items created in the parser for this query. Every item puts
339
itself to the list on creation (see Item::Item() for details))
342
MEM_ROOT *mem_root; // Pointer to current memroot
344
Query_arena(MEM_ROOT *mem_root_arg) :
345
free_list(0), mem_root(mem_root_arg)
348
This constructor is used only when Query_arena is created as
349
backup storage for another instance of Query_arena.
353
virtual ~Query_arena() {};
355
inline void* alloc(size_t size) { return alloc_root(mem_root,size); }
356
inline void* calloc(size_t size)
359
if ((ptr=alloc_root(mem_root,size)))
360
memset(ptr, 0, size);
363
inline char *strdup(const char *str)
364
{ return strdup_root(mem_root,str); }
365
inline char *strmake(const char *str, size_t size)
366
{ return strmake_root(mem_root,str,size); }
367
inline void *memdup(const void *str, size_t size)
368
{ return memdup_root(mem_root,str,size); }
369
inline void *memdup_w_gap(const void *str, size_t size, uint32_t gap)
372
if ((ptr= alloc_root(mem_root,size+gap)))
373
memcpy(ptr,str,size);
267
Storage engine specific thread local data.
268
Lifetime: one user connection.
272
* Resource contexts for both the "statement" and "normal"
275
* Resource context at index 0:
277
* Life time: one statement within a transaction. If @@autocommit is
278
* on, also represents the entire transaction.
280
* Resource context at index 1:
282
* Life time: one transaction within a connection.
286
* If the storage engine does not participate in a transaction,
287
* there will not be a resource context.
289
drizzled::ResourceContext resource_context[2];
291
Ha_data() :ha_ptr(NULL) {}
383
@brief State of a single command executed against this connection.
385
One connection can contain a lot of simultaneously running statements,
386
some of which could be:
387
- prepared, that is, contain placeholders,
388
To perform some action with statement we reset Session part to the state of
389
that statement, do the action, and then save back modified state from Session
390
to the statement. It will be changed in near future, and Statement will
394
class Statement: public ilink, public Query_arena
295
* Represents a client connection to the database server.
297
* Contains the client/server protocol object, the current statement
298
* being executed, local-to-session variables and status counters, and
299
* a host of other information.
303
* The Session class should have a vector of Statement object pointers which
304
* comprise the statements executed on the Session. Until this architectural
305
* change is done, we can forget about parallel operations inside a session.
309
* Make member variables private and have inlined accessors and setters. Hide
310
* all member variables that are not critical to non-internal operations of the
313
typedef int64_t session_id_t;
315
class Session : public Open_tables_state
396
Statement(const Statement &rhs); /* not implemented: */
397
Statement &operator=(const Statement &rhs); /* non-copyable */
400
Uniquely identifies each statement object in thread scope; change during
401
statement lifetime. FIXME: must be const
318
// Plugin storage in Session.
319
typedef boost::unordered_map<std::string, util::Storable *, util::insensitive_hash, util::insensitive_equal_to> PropertyMap;
320
typedef Session* Ptr;
321
typedef boost::shared_ptr<Session> shared_ptr;
406
324
MARK_COLUMNS_NONE: Means mark_used_colums is not set and no indicator to
453
507
the Session of that thread); that thread is (and must remain, for now) the
454
508
only responsible for freeing this member.
462
/* This constructor is called for backup statements */
465
Statement(LEX *lex_arg, MEM_ROOT *mem_root_arg, ulong id_arg);
469
struct st_savepoint {
470
struct st_savepoint *prev;
473
Ha_trx_info *ha_list;
476
enum xa_states {XA_NOTR=0, XA_ACTIVE, XA_IDLE, XA_PREPARED};
477
extern const char *xa_state_names[];
479
typedef struct st_xid_state {
480
/* For now, this is only used to catch duplicated external xids */
481
XID xid; // transaction identifier
482
enum xa_states xa_state; // used by external XA only
486
extern pthread_mutex_t LOCK_xid_cache;
487
extern HASH xid_cache;
488
bool xid_cache_init(void);
489
void xid_cache_free(void);
490
XID_STATE *xid_cache_search(XID *xid);
491
bool xid_cache_insert(XID *xid, enum xa_states xa_state);
492
bool xid_cache_insert(XID_STATE *xid_state);
493
void xid_cache_delete(XID_STATE *xid_state);
496
@class Security_context
497
@brief A set of Session members describing the current authenticated user.
500
class Security_context {
502
Security_context() {} /* Remove gcc warning */
504
host - host of the client
505
user - user of the client, set to NULL until the user has been read from
507
priv_user - The user privilege we are using. May be "" for anonymous user.
516
inline char *priv_host_name()
518
return (ip ? ip : (char *)"%");
524
A registry for item tree transformations performed during
525
query optimization. We register only those changes which require
526
a rollback to re-execute a prepared statement or stored procedure
530
struct Item_change_record;
531
typedef I_List<Item_change_record> Item_change_list;
535
Class that holds information about tables which were opened and locked
536
by the thread. It is also used to save/restore this information in
537
push_open_tables_state()/pop_open_tables_state().
540
class Open_tables_state
544
List of regular tables in use by this thread. Contains temporary and
545
base tables that were opened with @see open_tables().
549
List of temporary tables used by this thread. Contains user-level
550
temporary tables, created with CREATE TEMPORARY TABLE, and
551
internal temporary tables, created, e.g., to resolve a SELECT,
552
or for an intermediate table used in ALTER.
553
XXX Why are internal temporary tables added to this list?
555
Table *temporary_tables;
557
List of tables that were opened with HANDLER OPEN and are
558
still in use by this thread.
560
Table *handler_tables;
561
Table *derived_tables;
563
During a MySQL session, one can lock tables in two modes: automatic
564
or manual. In automatic mode all necessary tables are locked just before
565
statement execution, and all acquired locks are stored in 'lock'
566
member. Unlocking takes place automatically as well, when the
568
Manual mode comes into play when a user issues a 'LOCK TABLES'
569
statement. In this mode the user can only use the locked tables.
570
Trying to use any other tables will give an error. The locked tables are
571
stored in 'locked_tables' member. Manual locking is described in
572
the 'LOCK_TABLES' chapter of the MySQL manual.
573
See also lock_tables() for details.
577
Tables that were locked with explicit or implicit LOCK TABLES.
578
(Implicit LOCK TABLES happens when we are prelocking tables for
579
execution of statement which uses stored routines. See description
580
Session::prelocked_mode for more info.)
582
DRIZZLE_LOCK *locked_tables;
585
CREATE-SELECT keeps an extra lock for the table being
586
created. This field is used to keep the extra lock available for
587
lower level routines, which would otherwise miss that lock.
589
DRIZZLE_LOCK *extra_lock;
592
uint32_t current_tablenr;
595
BACKUPS_AVAIL = (1U << 0) /* There are backups available */
599
Flags with information about the open tables state.
601
uint32_t state_flags;
604
This constructor serves for creation of Open_tables_state instances
605
which are used as backup storage.
607
Open_tables_state() : state_flags(0U) { }
609
Open_tables_state(ulong version_arg);
611
void set_open_tables_state(Open_tables_state *state)
616
void reset_open_tables_state()
618
open_tables= temporary_tables= handler_tables= derived_tables= 0;
619
extra_lock= lock= locked_tables= 0;
625
/* Flags for the Session::system_thread variable */
626
enum enum_thread_type
629
SYSTEM_THREAD_SLAVE_IO,
630
SYSTEM_THREAD_SLAVE_SQL
635
This class represents the interface for internal error handlers.
636
Internal error handlers are exception handlers used by the server
639
class Internal_error_handler
642
Internal_error_handler() {}
643
virtual ~Internal_error_handler() {}
647
Handle an error condition.
648
This method can be implemented by a subclass to achieve any of the
650
- mask an error internally, prevent exposing it to the user,
651
- mask an error and throw another one instead.
652
When this method returns true, the error condition is considered
653
'handled', and will not be propagated to upper layers.
654
It is the responsability of the code installing an internal handler
655
to then check for trapped conditions, and implement logic to recover
656
from the anticipated conditions trapped during runtime.
658
This mechanism is similar to C++ try/throw/catch:
659
- 'try' correspond to <code>Session::push_internal_handler()</code>,
660
- 'throw' correspond to <code>my_error()</code>,
661
which invokes <code>my_message_sql()</code>,
662
- 'catch' correspond to checking how/if an internal handler was invoked,
663
before removing it from the exception stack with
664
<code>Session::pop_internal_handler()</code>.
666
@param sql_errno the error number
667
@param level the error level
668
@param session the calling thread
669
@return true if the error is handled
671
virtual bool handle_error(uint32_t sql_errno,
673
DRIZZLE_ERROR::enum_warning_level level,
674
Session *session) = 0;
679
Stores status of the currently executed statement.
680
Cleared at the beginning of the statement, and then
681
can hold either OK, ERROR, or EOF status.
682
Can not be assigned twice per statement.
685
class Diagnostics_area
688
enum enum_diagnostics_status
690
/** The area is cleared at start of a statement. */
692
/** Set whenever one calls my_ok(). */
694
/** Set whenever one calls my_eof(). */
696
/** Set whenever one calls my_error() or my_message(). */
698
/** Set in case of a custom response, such as one from COM_STMT_PREPARE. */
701
/** True if status information is sent to the client. */
703
/** Set to make set_error_status after set_{ok,eof}_status possible. */
704
bool can_overwrite_status;
706
void set_ok_status(Session *session, ha_rows affected_rows_arg,
707
uint64_t last_insert_id_arg,
708
const char *message);
709
void set_eof_status(Session *session);
710
void set_error_status(Session *session, uint32_t sql_errno_arg, const char *message_arg);
712
void disable_status();
714
void reset_diagnostics_area();
716
bool is_set() const { return m_status != DA_EMPTY; }
717
bool is_error() const { return m_status == DA_ERROR; }
718
bool is_eof() const { return m_status == DA_EOF; }
719
bool is_ok() const { return m_status == DA_OK; }
720
bool is_disabled() const { return m_status == DA_DISABLED; }
721
enum_diagnostics_status status() const { return m_status; }
723
const char *message() const
724
{ assert(m_status == DA_ERROR || m_status == DA_OK); return m_message; }
726
uint32_t sql_errno() const
727
{ assert(m_status == DA_ERROR); return m_sql_errno; }
729
uint32_t server_status() const
731
assert(m_status == DA_OK || m_status == DA_EOF);
732
return m_server_status;
735
ha_rows affected_rows() const
736
{ assert(m_status == DA_OK); return m_affected_rows; }
738
uint64_t last_insert_id() const
739
{ assert(m_status == DA_OK); return m_last_insert_id; }
741
uint32_t total_warn_count() const
743
assert(m_status == DA_OK || m_status == DA_EOF);
744
return m_total_warn_count;
747
Diagnostics_area() { reset_diagnostics_area(); }
750
/** Message buffer. Can be used by OK or ERROR status. */
751
char m_message[DRIZZLE_ERRMSG_SIZE];
753
SQL error number. One of ER_ codes from share/errmsg.txt.
754
Set by set_error_status.
756
uint32_t m_sql_errno;
759
Copied from session->server_status when the diagnostics area is assigned.
760
We need this member as some places in the code use the following pattern:
761
session->server_status|= ...
763
session->server_status&= ~...
764
Assigned by OK, EOF or ERROR.
766
uint32_t m_server_status;
768
The number of rows affected by the last statement. This is
769
semantically close to session->row_count_func, but has a different
770
life cycle. session->row_count_func stores the value returned by
771
function ROW_COUNT() and is cleared only by statements that
772
update its value, such as INSERT, UPDATE, DELETE and few others.
773
This member is cleared at the beginning of the next statement.
775
We could possibly merge the two, but life cycle of session->row_count_func
778
ha_rows m_affected_rows;
780
Similarly to the previous member, this is a replacement of
781
session->first_successful_insert_id_in_prev_stmt, which is used
782
to implement LAST_INSERT_ID().
784
uint64_t m_last_insert_id;
785
/** The total number of warnings. */
786
uint m_total_warn_count;
787
enum_diagnostics_status m_status;
789
@todo: the following Session members belong here:
790
- warn_list, warn_count,
796
Storage engine specific thread local data.
802
Storage engine specific thread local data.
803
Lifetime: one user connection.
807
0: Life time: one statement within a transaction. If @@autocommit is
808
on, also represents the entire transaction.
809
@sa trans_register_ha()
811
1: Life time: one transaction within a connection.
812
If the storage engine does not participate in a transaction,
813
this should not be used.
814
@sa trans_register_ha()
816
Ha_trx_info ha_info[2];
818
Ha_data() :ha_ptr(NULL) {}
824
For each client connection we create a separate thread with Session serving as
825
a thread/connection descriptor
828
class Session :public Statement,
829
public Open_tables_state
511
util::string::shared_ptr _schema;
832
/* Used to execute base64 coded binlog events in MySQL server */
833
Relay_log_info* rli_fake;
514
util::string::const_shared_ptr schema() const
519
return util::string::const_shared_ptr(new std::string(""));
522
/* current cache key */
523
std::string query_cache_key;
836
525
Constant for Session::where initialization in the beginning of every query.
838
527
It's needed because we do not save/restore Session::where normally during
841
530
static const char * const DEFAULT_WHERE;
843
NET net; // client connection descriptor
844
MEM_ROOT warn_root; // For warnings and errors
845
Protocol *protocol; // Current protocol
846
Protocol_text protocol_text; // Normal protocol
847
HASH user_vars; // hash for user variables
848
String packet; // dynamic buffer for network I/O
849
String convert_buffer; // buffer for charset conversions
850
struct rand_struct rand; // used for authentication
851
struct system_variables variables; // Changeable local variables
852
struct system_status_var status_var; // Per thread statistic vars
853
struct system_status_var *initial_status_var; /* used by show status */
854
THR_LOCK_INFO lock_info; // Locking info of this thread
855
THR_LOCK_OWNER main_lock_id; // To use for conventional queries
856
THR_LOCK_OWNER *lock_id; // If not main_lock_id, points to
857
// the lock_id of a cursor.
858
pthread_mutex_t LOCK_delete; // Locked before session is deleted
860
A pointer to the stack frame of handle_one_connection(),
861
which is called first in the thread for handling a client
866
Currently selected catalog.
872
Some members of Session (currently 'Statement::db',
873
'catalog' and 'query') are set and alloced by the slave SQL thread
874
(for the Session of that thread); that thread is (and must remain, for now)
875
the only responsible for freeing these 3 members. If you add members
876
here, and you add code to set them in replication, don't forget to
877
free_them_and_set_them_to_0 in replication properly. For details see
878
the 'err:' label of the handle_slave_sql() in sql/slave.cc.
880
@see handle_slave_sql
883
Security_context main_security_ctx;
884
Security_context *security_ctx;
887
Points to info-string that we show in SHOW PROCESSLIST
888
You are supposed to call Session_SET_PROC_INFO only if you have coded
889
a time-consuming piece that MySQL can get stuck in for a long time.
891
Set it using the session_proc_info(Session *thread, const char *message)
894
void set_proc_info(const char *info) { proc_info= info; }
895
const char* get_proc_info() const { return proc_info; }
532
memory::Root warn_root; /**< Allocation area for warnings and errors */
533
plugin::Client *client; /**< Pointer to client object */
535
void setClient(plugin::Client *client_arg);
537
plugin::Client *getClient()
542
plugin::Scheduler *scheduler; /**< Pointer to scheduler object */
543
void *scheduler_arg; /**< Pointer to the optional scheduler argument */
545
typedef boost::unordered_map< std::string, user_var_entry *, util::insensitive_hash, util::insensitive_equal_to> UserVars;
547
typedef std::pair< UserVars::iterator, UserVars::iterator > UserVarsRange;
548
UserVars user_vars; /**< Hash of user variables defined during the session's lifetime */
552
const UserVars &getUserVariables() const
557
drizzle_system_variables variables; /**< Mutable local variables local to the session */
558
struct system_status_var status_var; /**< Session-local status counters */
559
THR_LOCK_INFO lock_info; /**< Locking information for this session */
560
THR_LOCK_OWNER main_lock_id; /**< To use for conventional queries */
561
THR_LOCK_OWNER *lock_id; /**< If not main_lock_id, points to the lock_id of a cursor. */
564
* A pointer to the stack frame of the scheduler thread
565
* which is called first in the thread for handling a client
570
SecurityContext security_ctx;
572
int32_t scoreboard_index;
574
inline void checkSentry() const
576
assert(this->dbug_sentry == Session_SENTRY_MAGIC);
579
const SecurityContext& getSecurityContext() const
584
SecurityContext& getSecurityContext()
589
int32_t getScoreboardIndex()
591
return scoreboard_index;
594
void setScoreboardIndex(int32_t in_scoreboard_index)
596
scoreboard_index= in_scoreboard_index;
600
* Is this session viewable by the current user?
602
bool isViewable() const;
898
605
Used in error messages to tell user in what part of MySQL we found an
899
606
error. E. g. when where= "having clause", if fix_fields() fails, user
900
607
will know that the error was in having clause.
902
609
const char *where;
904
double tmp_double_value; /* Used in set_var.cc */
905
ulong client_capabilities; /* What the client supports */
906
ulong max_client_packet_length;
908
HASH handler_tables_hash;
910
612
One thread can hold up to one named user-level lock. This variable
911
613
points to a lock object if the lock is present. See item_func.cc and
912
chapter 'Miscellaneous functions', for functions GET_LOCK, RELEASE_LOCK.
914
uint32_t dbug_sentry; // watch out for memory corruption
915
struct st_my_thread_var *mysys_var;
917
Type of current query: COM_STMT_PREPARE, COM_QUERY, etc. Set from
918
first byte of the packet in do_command()
614
chapter 'Miscellaneous functions', for functions GET_LOCK, RELEASE_LOCK.
616
uint32_t dbug_sentry; /**< watch for memory corruption */
618
boost::thread::id boost_thread_id;
619
boost_thread_shared_ptr _thread;
620
boost::this_thread::disable_interruption *interrupt;
622
internal::st_my_thread_var *mysys_var;
625
boost_thread_shared_ptr &getThread()
630
void pushInterrupt(boost::this_thread::disable_interruption *interrupt_arg)
632
interrupt= interrupt_arg;
635
boost::this_thread::disable_interruption &getThreadInterupt()
641
internal::st_my_thread_var *getThreadVar()
647
* Type of current query: COM_STMT_PREPARE, COM_QUERY, etc. Set from
648
* first byte of the packet in executeStatement()
920
650
enum enum_server_command command;
922
uint32_t file_id; // for LOAD DATA INFILE
923
/* remote (peer) port */
925
time_t start_time, user_time;
926
uint64_t connect_utime, thr_create_utime; // track down slow pthread_create
927
uint64_t start_utime, utime_after_lock;
651
uint32_t file_id; /**< File ID for LOAD DATA INFILE */
652
/* @note the following three members should likely move to Client */
653
uint32_t max_client_packet_length; /**< Maximum number of bytes a client can send in a single packet */
656
uint64_t thr_create_utime; /**< track down slow pthread_create */
657
uint64_t start_utime;
658
uint64_t utime_after_lock;
929
660
thr_lock_type update_lock_default;
663
Both of the following container points in session will be converted to an API.
931
667
/* container for handler's private per-connection data */
932
Ha_data ha_data[MAX_HA];
934
/* Place to store various things */
935
void *session_marker;
936
int binlog_setup_trx_data();
939
Public interface to write RBR events to the binlog
941
void binlog_start_trans_and_stmt();
942
void binlog_set_stmt_begin();
943
int binlog_write_table_map(Table *table, bool is_transactional);
944
int binlog_write_row(Table* table, bool is_transactional,
945
const unsigned char *new_data);
946
int binlog_delete_row(Table* table, bool is_transactional,
947
const unsigned char *old_data);
948
int binlog_update_row(Table* table, bool is_transactional,
949
const unsigned char *old_data, const unsigned char *new_data);
951
void set_server_id(uint32_t sid) { server_id = sid; }
954
Member functions to handle pending event for row-level logging.
956
template <class RowsEventT> Rows_log_event*
957
binlog_prepare_pending_rows_event(Table* table, uint32_t serv_id,
959
bool is_transactional,
961
Rows_log_event* binlog_get_pending_rows_event() const;
962
void binlog_set_pending_rows_event(Rows_log_event* ev);
963
int binlog_flush_pending_rows_event(bool stmt_end);
966
uint32_t binlog_table_maps; // Number of table maps currently in the binlog
668
std::vector<Ha_data> ha_data;
670
Id of current query. Statement can be reused to execute several queries
671
query_id is global in context of the whole MySQL server.
672
ID is automatically generated from an atomic counter.
673
It's used in Cursor code for various purposes: to check which columns
674
from table are necessary for this select, to check if it's necessary to
675
update auto-updatable fields (like auto_increment and timestamp).
678
query_id_t warn_query_id;
680
void **getEngineData(const plugin::MonitoredInTransaction *monitored);
681
ResourceContext *getResourceContext(const plugin::MonitoredInTransaction *monitored,
969
Flags with per-thread information regarding the status of the
685
* Structure used to manage "statement transactions" and
686
* "normal transactions". In autocommit mode, the normal transaction is
687
* equivalent to the statement transaction.
689
* Storage engines will be registered here when they participate in
690
* a transaction. No engine is registered more than once.
972
uint32_t binlog_flags;
974
uint32_t get_binlog_table_maps() const {
975
return binlog_table_maps;
977
void clear_binlog_table_maps() {
978
binlog_table_maps= 0;
983
692
struct st_transactions {
984
SAVEPOINT *savepoints;
985
Session_TRANS all; // Trans since BEGIN WORK
986
Session_TRANS stmt; // Trans for current statement
987
bool on; // see ha_enable_transaction()
693
std::deque<NamedSavepoint> savepoints;
696
* The normal transaction (since BEGIN WORK).
698
* Contains a list of all engines that have participated in any of the
699
* statement transactions started within the context of the normal
702
* @note In autocommit mode, this is empty.
704
TransactionContext all;
707
* The statment transaction.
709
* Contains a list of all engines participating in the given statement.
711
* @note In autocommit mode, this will be used to commit/rollback the
712
* normal transaction.
714
TransactionContext stmt;
988
716
XID_STATE xid_state;
989
Rows_log_event *m_pending_rows_event;
992
Tables changed in transaction (that must be invalidated in query cache).
993
List contain only transactional tables, that not invalidated in query
994
cache (instead of full list of changed in transaction tables).
996
CHANGED_TableList* changed_tables;
997
MEM_ROOT mem_root; // Transaction-life memory allocation pool
1002
free_root(&mem_root,MYF(MY_KEEP_PREALLOC));
1006
memset(this, 0, sizeof(*this));
1007
xid_state.xid.null();
1008
init_sql_alloc(&mem_root, ALLOC_ROOT_MIN_BLOCK_SIZE, 0);
1012
731
sigset_t signals;
1014
This is to track items changed during execution of a prepared
1015
statement/stored procedure. It's created by
1016
register_item_tree_change() in memory root of Session, and freed in
1017
rollback_item_tree_changes(). For conventional execution it's always
1020
Item_change_list change_list;
733
// As of right now we do not allow a concurrent execute to launch itself
735
bool concurrent_execute_allowed;
738
void setConcurrentExecute(bool arg)
740
concurrent_execute_allowed= arg;
743
bool isConcurrentExecuteAllowed() const
745
return concurrent_execute_allowed;
1022
748
/* Tells if LAST_INSERT_ID(#) was called for the current statement */
1023
749
bool arg_of_last_insert_id_function;
1025
752
ALL OVER THIS FILE, "insert_id" means "*automatically generated* value for
1026
753
insertion into an auto_increment column".
1029
756
This is the first autogenerated insert id which was *successfully*
1030
757
inserted by the previous statement (exactly, if the previous statement
1031
758
didn't successfully insert an autogenerated insert id, then it's the one
1069
795
in the binlog is still needed; the list's minimum will contain 3.
1071
797
Discrete_intervals_list auto_inc_intervals_in_cur_stmt_for_binlog;
1072
/* Used by replication and SET INSERT_ID */
798
/** Used by replication and SET INSERT_ID */
1073
799
Discrete_intervals_list auto_inc_intervals_forced;
801
uint64_t limit_found_rows;
802
uint64_t options; /**< Bitmap of options */
803
int64_t row_count_func; /**< For the ROW_COUNT() function */
804
ha_rows cuted_fields; /**< Count of "cut" or truncated fields. @todo Kill this friggin thing. */
807
* Number of rows we actually sent to the client, including "synthetic"
808
* rows in ROLLUP etc.
810
ha_rows sent_row_count;
813
* Number of rows we read, sent or not, including in create_sort_index()
815
ha_rows examined_row_count;
818
* The set of those tables whose fields are referenced in all subqueries
823
* Possibly this it is incorrect to have used tables in Session because
824
* with more than one subquery, it is not clear what does the field mean.
826
table_map used_tables;
831
This, and some other variables like 'count_cuted_fields'
832
maybe should be statement/cursor local, that is, moved to Statement
833
class. With current implementation warnings produced in each prepared
834
statement/cursor settle here.
836
List<DRIZZLE_ERROR> warn_list;
837
uint32_t warn_count[(uint32_t) DRIZZLE_ERROR::WARN_LEVEL_END];
838
uint32_t total_warn_count;
839
Diagnostics_area main_da;
843
/* Statement id is thread-wide. This counter is used to generate ids */
844
uint32_t statement_id_counter;
845
uint32_t rand_saved_seed1;
846
uint32_t rand_saved_seed2;
848
Row counter, mainly for errors and warnings. Not increased in
849
create_sort_index(); may differ from examined_row_count.
852
session_id_t thread_id;
854
enum global_read_lock_t
857
GOT_GLOBAL_READ_LOCK= 1,
858
MADE_GLOBAL_READ_LOCK_BLOCK_COMMIT= 2
861
global_read_lock_t _global_read_lock;
865
global_read_lock_t isGlobalReadLock() const
867
return _global_read_lock;
870
void setGlobalReadLock(global_read_lock_t arg)
872
_global_read_lock= arg;
875
DrizzleLock *lockTables(Table **tables, uint32_t count, uint32_t flags, bool *need_reopen);
876
bool lockGlobalReadLock();
877
bool lock_table_names(TableList *table_list);
878
bool lock_table_names_exclusively(TableList *table_list);
879
bool makeGlobalReadLockBlockCommit();
880
bool abortLockForThread(Table *table);
881
bool wait_if_global_read_lock(bool abort_on_refresh, bool is_not_commit);
882
int lock_table_name(TableList *table_list);
883
void abortLock(Table *table);
884
void removeLock(Table *table);
885
void unlockReadTables(DrizzleLock *sql_lock);
886
void unlockSomeTables(Table **table, uint32_t count);
887
void unlockTables(DrizzleLock *sql_lock);
888
void startWaitingGlobalReadLock();
889
void unlockGlobalReadLock();
892
int unlock_external(Table **table, uint32_t count);
893
int lock_external(Table **tables, uint32_t count);
894
bool wait_for_locked_table_names(TableList *table_list);
895
DrizzleLock *get_lock_data(Table **table_ptr, uint32_t count,
896
bool should_lock, Table **write_lock_used);
899
uint32_t server_status;
900
uint32_t open_options;
901
uint32_t select_number; /**< number of select (used for EXPLAIN) */
902
/* variables.transaction_isolation is reset to this after each commit */
903
enum_tx_isolation session_tx_isolation;
904
enum_check_fields count_cuted_fields;
912
KILLED_NO_VALUE /* means none of the above states apply */
915
killed_state_t volatile _killed;
919
void setKilled(killed_state_t arg)
924
killed_state_t getKilled()
929
volatile killed_state_t *getKilledPtr() // Do not use this method, it is here for historical convience.
934
bool some_tables_deleted;
938
Set to true if execution of the current compound statement
939
can not continue. In particular, disables activation of
940
CONTINUE or EXIT handlers of stored routines.
941
Reset in the end of processing of the current user request, in
942
@see mysql_reset_session_for_next_command().
946
Set by a storage engine to request the entire
947
transaction (that possibly spans multiple engines) to
948
rollback. Reset in ha_rollback.
950
bool transaction_rollback_request;
952
true if we are in a sub-statement and the current error can
953
not be safely recovered until we left the sub-statement mode.
954
In particular, disables activation of CONTINUE and EXIT
955
handlers inside sub-statements. E.g. if it is a deadlock
956
error and requires a transaction-wide rollback, this flag is
957
raised (traditionally, MySQL first has to close all the reads
958
via @see handler::ha_index_or_rnd_end() and only then perform
960
Reset to false when we leave the sub-statement mode.
962
bool is_fatal_sub_stmt_error;
963
/** for IS NULL => = last_insert_id() fix in remove_eq_conds() */
964
bool substitute_null_with_insert_id;
967
bool abort_on_warning;
968
bool got_warning; /**< Set on call to push_warning() */
969
bool no_warnings_for_error; /**< no warnings on call to my_error() */
970
/** set during loop of derived table processing */
971
bool derived_tables_processing;
972
bool tablespace_op; /**< This is true in DISCARD/IMPORT TABLESPACE */
974
/** Used by the sys_var class to store temporary values */
978
uint32_t uint32_t_value;
979
int32_t int32_t_value;
980
uint64_t uint64_t_value;
984
Character input stream consumed by the lexical analyser,
986
Note that since the parser is not re-entrant, we keep only one input
987
stream here. This member is valid only when executing code during parsing,
988
and may point to invalid memory after that.
990
Lex_input_stream *m_lip;
992
/** Place to store various things */
993
void *session_marker;
995
/** Keeps a copy of the previous table around in case we are just slamming on particular table */
999
Points to info-string that we show in SHOW PROCESSLIST
1000
You are supposed to call Session_SET_PROC_INFO only if you have coded
1001
a time-consuming piece that MySQL can get stuck in for a long time.
1003
Set it using the session_proc_info(Session *thread, const char *message)
1006
inline void set_proc_info(const char *info)
1010
inline const char* get_proc_info() const
1015
/** Sets this Session's current query ID */
1016
inline void setQueryId(query_id_t in_query_id)
1018
query_id= in_query_id;
1021
/** Returns the current query ID */
1022
query_id_t getQueryId() const
1028
/** Sets this Session's warning query ID */
1029
inline void setWarningQueryId(query_id_t in_query_id)
1031
warn_query_id= in_query_id;
1034
/** Returns the Session's warning query ID */
1035
inline query_id_t getWarningQueryId() const
1037
return warn_query_id;
1040
/** Accessor method returning the session's ID. */
1041
inline session_id_t getSessionId() const
1046
/** Accessor method returning the server's ID. */
1047
inline uint32_t getServerId() const
1049
/* We return the global server ID. */
1053
/** Returns the current transaction ID for the session's current statement */
1054
inline my_xid getTransactionId()
1056
return transaction.xid_state.xid.quick_get_my_xid();
1075
1059
There is BUG#19630 where statement-based replication of stored
1076
1060
functions/triggers with two auto_increment columns breaks.
1077
1061
We however ensure that it works when there is 0 or 1 auto_increment
1127
1111
auto_inc_intervals_forced.append(next_id, UINT64_MAX, 0);
1130
uint64_t limit_found_rows;
1131
uint64_t options; /* Bitmap of states */
1132
int64_t row_count_func; /* For the ROW_COUNT() function */
1133
ha_rows cuted_fields;
1136
number of rows we actually sent to the client, including "synthetic"
1139
ha_rows sent_row_count;
1142
number of rows we read, sent or not, including in create_sort_index()
1144
ha_rows examined_row_count;
1147
The set of those tables whose fields are referenced in all subqueries
1149
TODO: possibly this it is incorrect to have used tables in Session because
1150
with more than one subquery, it is not clear what does the field mean.
1152
table_map used_tables;
1153
USER_CONN *user_connect;
1154
const CHARSET_INFO *db_charset;
1156
FIXME: this, and some other variables like 'count_cuted_fields'
1157
maybe should be statement/cursor local, that is, moved to Statement
1158
class. With current implementation warnings produced in each prepared
1159
statement/cursor settle here.
1161
List <DRIZZLE_ERROR> warn_list;
1162
uint warn_count[(uint) DRIZZLE_ERROR::WARN_LEVEL_END];
1163
uint total_warn_count;
1164
Diagnostics_area main_da;
1167
Id of current query. Statement can be reused to execute several queries
1168
query_id is global in context of the whole MySQL server.
1169
ID is automatically generated from mutex-protected counter.
1170
It's used in handler code for various purposes: to check which columns
1171
from table are necessary for this select, to check if it's necessary to
1172
update auto-updatable fields (like auto_increment and timestamp).
1174
query_id_t query_id, warn_id;
1177
#ifdef ERROR_INJECT_SUPPORT
1178
ulong error_inject_value;
1180
/* Statement id is thread-wide. This counter is used to generate ids */
1181
ulong statement_id_counter;
1182
ulong rand_saved_seed1, rand_saved_seed2;
1184
Row counter, mainly for errors and warnings. Not increased in
1185
create_sort_index(); may differ from examined_row_count.
1188
pthread_t real_id; /* For debugging */
1189
my_thread_id thread_id;
1190
uint tmp_table, global_read_lock;
1191
uint server_status,open_options;
1192
enum enum_thread_type system_thread;
1193
uint32_t select_number; //number of select (used for EXPLAIN)
1194
/* variables.transaction_isolation is reset to this after each commit */
1195
enum_tx_isolation session_tx_isolation;
1196
enum_check_fields count_cuted_fields;
1198
DYNAMIC_ARRAY user_var_events; /* For user variables replication */
1199
MEM_ROOT *user_var_events_alloc; /* Allocate above array elements here */
1207
KILLED_NO_VALUE /* means neither of the states */
1209
killed_state volatile killed;
1211
/* scramble - random string sent to client on handshake */
1212
char scramble[SCRAMBLE_LENGTH+1];
1215
bool some_tables_deleted;
1216
bool last_cuted_field;
1217
bool no_errors, password;
1219
Set to true if execution of the current compound statement
1220
can not continue. In particular, disables activation of
1221
CONTINUE or EXIT handlers of stored routines.
1222
Reset in the end of processing of the current user request, in
1223
@see mysql_reset_session_for_next_command().
1225
bool is_fatal_error;
1227
Set by a storage engine to request the entire
1228
transaction (that possibly spans multiple engines) to
1229
rollback. Reset in ha_rollback.
1231
bool transaction_rollback_request;
1233
true if we are in a sub-statement and the current error can
1234
not be safely recovered until we left the sub-statement mode.
1235
In particular, disables activation of CONTINUE and EXIT
1236
handlers inside sub-statements. E.g. if it is a deadlock
1237
error and requires a transaction-wide rollback, this flag is
1238
raised (traditionally, MySQL first has to close all the reads
1239
via @see handler::ha_index_or_rnd_end() and only then perform
1241
Reset to false when we leave the sub-statement mode.
1243
bool is_fatal_sub_stmt_error;
1244
bool query_start_used;
1245
/* for IS NULL => = last_insert_id() fix in remove_eq_conds() */
1246
bool substitute_null_with_insert_id;
1247
bool in_lock_tables;
1249
True if a slave error. Causes the slave to stop. Not the same
1250
as the statement execution error (is_error()), since
1251
a statement may be expected to return an error, e.g. because
1252
it returned an error on master, and this is OK on the slave.
1254
bool is_slave_error;
1257
/** is set if some thread specific value(s) used in a statement. */
1258
bool thread_specific_used;
1259
bool charset_is_system_charset, charset_is_collation_connection;
1260
bool charset_is_character_set_filesystem;
1261
bool abort_on_warning;
1262
bool got_warning; /* Set on call to push_warning() */
1263
bool no_warnings_for_error; /* no warnings on call to my_error() */
1264
/* set during loop of derived table processing */
1265
bool derived_tables_processing;
1266
bool tablespace_op; /* This is true in DISCARD/IMPORT TABLESPACE */
1269
If we do a purge of binary logs, log index info of the threads
1270
that are currently reading it needs to be adjusted. To do that
1271
each thread that is using LOG_INFO needs to adjust the pointer to it
1273
LOG_INFO* current_linfo;
1274
NET* slave_net; // network connection from slave -> m.
1275
/* Used by the sys_var class to store temporary values */
1281
uint64_t uint64_t_value;
1286
If true, drizzle_bin_log::write(Log_event) call will not write events to
1287
binlog, and maintain 2 below variables instead (use
1288
drizzle_bin_log.start_union_events to turn this on)
1292
If true, at least one drizzle_bin_log::write(Log_event) call has been
1293
made after last drizzle_bin_log.start_union_events() call.
1295
bool unioned_events;
1297
If true, at least one drizzle_bin_log::write(Log_event e), where
1298
e.cache_stmt == true call has been made after last
1299
drizzle_bin_log.start_union_events() call.
1301
bool unioned_events_trans;
1304
'queries' (actually SP statements) that run under inside this binlog
1305
union have session->query_id >= first_query_id.
1307
query_id_t first_query_id;
1311
Character input stream consumed by the lexical analyser,
1312
used during parsing.
1313
Note that since the parser is not re-entrant, we keep only one input
1314
stream here. This member is valid only when executing code during parsing,
1315
and may point to invalid memory after that.
1317
Lex_input_stream *m_lip;
1114
Session(plugin::Client *client_arg);
1119
* Cleans up after query.
1123
* This function is used to reset thread data to its default state.
1125
* This function is not suitable for setting thread data to some
1126
* non-default values, as there is only one replication thread, so
1127
* different master threads may overwrite data of each other on
1130
void cleanup_after_query();
1131
bool storeGlobals();
1132
void awake(Session::killed_state_t state_to_set);
1134
* Pulls thread-specific variables into Session state.
1136
* Returns true most times, or false if there was a problem
1137
* allocating resources for thread-specific storage.
1139
* @TODO Kill this. It's not necessary once my_thr_init() is bye bye.
1324
1145
Initialize memory roots necessary for query processing and (!)
1325
1146
pre-allocate memory for it. We can't do that in Session constructor because
1326
there are use cases (acl_init, watcher threads,
1327
killing mysqld) where it's vital to not allocate excessive and not used
1328
memory. Note, that we still don't return error from init_for_queries():
1329
if preallocation fails, we should notice that at the first call to
1147
there are use cases where it's vital to not allocate excessive and not used
1332
void init_for_queries();
1333
void change_user(void);
1335
void cleanup_after_query();
1336
bool store_globals();
1337
void awake(Session::killed_state state_to_set);
1339
enum enum_binlog_query_type {
1341
The query can be logged row-based or statement-based
1346
The query has to be logged statement-based
1351
The query represents a change to a table in the "mysql"
1352
database and is currently mapped to ROW_QUERY_TYPE.
1358
int binlog_query(enum_binlog_query_type qtype,
1359
char const *query, ulong query_len,
1360
bool is_trans, bool suppress_use,
1361
Session::killed_state killed_err_arg= Session::KILLED_NO_VALUE);
1150
void prepareForQueries();
1153
* Executes a single statement received from the
1154
* client connection.
1156
* Returns true if the statement was successful, or false
1161
* For profiling to work, it must never be called recursively.
1163
* In MySQL, this used to be the do_command() C function whic
1164
* accepted a single parameter of the THD pointer.
1166
bool executeStatement();
1169
* Reads a query from packet and stores it.
1171
* Returns true if query is read and allocated successfully,
1172
* false otherwise. On a return of false, Session::fatal_error
1175
* @note Used in COM_QUERY and COM_STMT_PREPARE.
1177
* Sets the following Session variables:
1181
* @param The packet pointer to read from
1182
* @param The length of the query to read
1184
bool readAndStoreQuery(const char *in_packet, uint32_t in_packet_length);
1187
* Ends the current transaction and (maybe) begins the next.
1189
* Returns true if the transaction completed successfully,
1192
* @param Completion type
1194
bool endTransaction(enum enum_mysql_completiontype completion);
1195
bool endActiveTransaction();
1196
bool startTransaction(start_transaction_option_t opt= START_TRANS_NO_OPTIONS);
1199
* Authenticates users, with error reporting.
1201
* Returns true on success, or false on failure.
1203
bool authenticate();
1208
* This will initialize the session and begin the command loop.
1213
* Schedule a session to be run on the default scheduler.
1215
static bool schedule(Session::shared_ptr&);
1217
static void unlink(Session::shared_ptr&);
1364
1220
For enter_cond() / exit_cond() to work the mutex must be got before
1365
1221
enter_cond(); this mutex is then released by exit_cond().
1366
1222
Usage must be: lock mutex; enter_cond(); your code; exit_cond().
1368
inline const char* enter_cond(pthread_cond_t *cond, pthread_mutex_t* mutex,
1371
const char* old_msg = get_proc_info();
1372
safe_mutex_assert_owner(mutex);
1373
mysys_var->current_mutex = mutex;
1374
mysys_var->current_cond = cond;
1375
this->set_proc_info(msg);
1378
inline void exit_cond(const char* old_msg)
1381
Putting the mutex unlock in exit_cond() ensures that
1382
mysys_var->current_mutex is always unlocked _before_ mysys_var->mutex is
1383
locked (if that would not be the case, you'll get a deadlock if someone
1384
does a Session::awake() on you).
1386
pthread_mutex_unlock(mysys_var->current_mutex);
1387
pthread_mutex_lock(&mysys_var->mutex);
1388
mysys_var->current_mutex = 0;
1389
mysys_var->current_cond = 0;
1390
this->set_proc_info(old_msg);
1391
pthread_mutex_unlock(&mysys_var->mutex);
1393
inline time_t query_start() { query_start_used=1; return start_time; }
1224
const char* enter_cond(boost::condition_variable_any &cond, boost::mutex &mutex, const char* msg);
1225
void exit_cond(const char* old_msg);
1227
inline time_t query_start() { return start_time; }
1394
1228
inline void set_time()
1230
boost::posix_time::ptime mytime(boost::posix_time::microsec_clock::local_time());
1231
boost::posix_time::ptime epoch(boost::gregorian::date(1970,1,1));
1232
start_utime= utime_after_lock= (mytime-epoch).total_microseconds();
1398
1236
start_time= user_time;
1399
start_utime= utime_after_lock= my_micro_time();
1237
connect_microseconds= start_utime;
1402
start_utime= utime_after_lock= my_micro_time_and_time(&start_time);
1240
start_time= (mytime-epoch).total_seconds();
1404
inline void set_current_time() { start_time= my_time(MY_WME); }
1242
inline void set_current_time() { start_time= time(NULL); }
1405
1243
inline void set_time(time_t t)
1407
1245
start_time= user_time= t;
1408
start_utime= utime_after_lock= my_micro_time();
1410
void set_time_after_lock() { utime_after_lock= my_micro_time(); }
1411
uint64_t current_utime() { return my_micro_time(); }
1246
boost::posix_time::ptime mytime(boost::posix_time::microsec_clock::local_time());
1247
boost::posix_time::ptime epoch(boost::gregorian::date(1970,1,1));
1248
uint64_t t_mark= (mytime-epoch).total_microseconds();
1250
start_utime= utime_after_lock= t_mark;
1252
void set_time_after_lock() {
1253
boost::posix_time::ptime mytime(boost::posix_time::microsec_clock::local_time());
1254
boost::posix_time::ptime epoch(boost::gregorian::date(1970,1,1));
1255
utime_after_lock= (mytime-epoch).total_microseconds();
1258
* Returns the current micro-timestamp
1260
inline uint64_t getCurrentTimestamp()
1262
boost::posix_time::ptime mytime(boost::posix_time::microsec_clock::local_time());
1263
boost::posix_time::ptime epoch(boost::gregorian::date(1970,1,1));
1264
uint64_t t_mark= (mytime-epoch).total_microseconds();
1412
1268
inline uint64_t found_rows(void)
1414
1270
return limit_found_rows;
1416
inline bool active_transaction()
1272
/** Returns whether the session is currently inside a transaction */
1273
inline bool inTransaction()
1418
1275
return server_status & SERVER_STATUS_IN_TRANS;
1420
inline bool fill_derived_tables()
1422
return !lex->only_view_structure();
1424
inline void* trans_alloc(unsigned int size)
1426
return alloc_root(&transaction.mem_root,size);
1429
1277
LEX_STRING *make_lex_string(LEX_STRING *lex_str,
1430
1278
const char* str, uint32_t length,
1431
1279
bool allocate_lex_string);
1433
bool convert_string(LEX_STRING *to, const CHARSET_INFO * const to_cs,
1434
const char *from, uint32_t from_length,
1435
const CHARSET_INFO * const from_cs);
1437
bool convert_string(String *s, const CHARSET_INFO * const from_cs, const CHARSET_INFO * const to_cs);
1439
void add_changed_table(Table *table);
1440
void add_changed_table(const char *key, long key_length);
1441
CHANGED_TableList * changed_table_dup(const char *key, long key_length);
1280
LEX_STRING *make_lex_string(LEX_STRING *lex_str,
1281
const std::string &str,
1282
bool allocate_lex_string);
1442
1284
int send_explain_fields(select_result *result);
1444
1286
Clear the current error, if any.
1615
1595
- for prepared queries, only to allocate runtime data. The parsed
1616
1596
tree itself is reused between executions and thus is stored elsewhere.
1618
MEM_ROOT main_mem_root;
1622
/** A short cut for session->main_da.set_ok_status(). */
1625
my_ok(Session *session, ha_rows affected_rows= 0, uint64_t id= 0,
1626
const char *message= NULL)
1628
session->main_da.set_ok_status(session, affected_rows, id, message);
1632
/** A short cut for session->main_da.set_eof_status(). */
1635
my_eof(Session *session)
1637
session->main_da.set_eof_status(session);
1640
#define tmp_disable_binlog(A) \
1641
{uint64_t tmp_disable_binlog__save_options= (A)->options; \
1642
(A)->options&= ~OPTION_BIN_LOG
1644
#define reenable_binlog(A) (A)->options= tmp_disable_binlog__save_options;}
1648
Used to hold information about file and file structure in exchange
1649
via non-DB file (...INTO OUTFILE..., ...LOAD DATA...)
1650
XXX: We never call destructor for objects of this class.
1653
class sql_exchange :public Sql_alloc
1656
enum enum_filetype filetype; /* load XML, Added by Arnold & Erik */
1658
String *field_term,*enclosed,*line_term,*line_start,*escaped;
1662
const CHARSET_INFO *cs;
1663
sql_exchange(char *name, bool dumpfile_flag,
1664
enum_filetype filetype_arg= FILETYPE_CSV);
1667
#include "log_event.h"
1670
This is used to get result from a select
1675
class select_result :public Sql_alloc {
1678
SELECT_LEX_UNIT *unit;
1681
virtual ~select_result() {};
1682
virtual int prepare(List<Item> &,
1688
virtual int prepare2(void) { return 0; }
1690
Because of peculiarities of prepared statements protocol
1691
we need to know number of columns in the result set (if
1692
there is a result set) apart from sending columns metadata.
1694
virtual uint32_t field_count(List<Item> &fields) const
1695
{ return fields.elements; }
1696
virtual bool send_fields(List<Item> &list, uint32_t flags)=0;
1697
virtual bool send_data(List<Item> &items)=0;
1698
virtual bool initialize_tables (JOIN *)
1700
virtual void send_error(uint32_t errcode,const char *err);
1701
virtual bool send_eof()=0;
1703
Check if this query returns a result set and therefore is allowed in
1704
cursors and set an error message if it is not the case.
1706
@retval false success
1707
@retval true error, an error message is set
1709
virtual bool check_simple_select() const;
1710
virtual void abort() {}
1712
Cleanup instance of this class for next execution of a prepared
1713
statement/stored procedure.
1715
virtual void cleanup();
1716
void set_session(Session *session_arg) { session= session_arg; }
1717
void begin_dataset() {}
1722
Base class for select_result descendands which intercept and
1723
transform result set rows. As the rows are not sent to the client,
1724
sending of result set metadata should be suppressed as well.
1727
class select_result_interceptor: public select_result
1730
select_result_interceptor() {} /* Remove gcc warning */
1731
uint32_t field_count(List<Item> &) const
1733
bool send_fields(List<Item> &,
1739
class select_send :public select_result {
1741
True if we have sent result set metadata to the client.
1742
In this case the client always expects us to end the result
1743
set with an eof or error packet
1745
bool is_result_set_started;
1747
select_send() :is_result_set_started(false) {}
1748
bool send_fields(List<Item> &list, uint32_t flags);
1749
bool send_data(List<Item> &items);
1751
virtual bool check_simple_select() const { return false; }
1753
virtual void cleanup();
1757
class select_to_file :public select_result_interceptor {
1759
sql_exchange *exchange;
1763
char path[FN_REFLEN];
1766
select_to_file(sql_exchange *ex) :exchange(ex), file(-1),row_count(0L)
1769
void send_error(uint32_t errcode,const char *err);
1598
memory::Root main_mem_root;
1601
* Marks all tables in the list which were used by current substatement
1602
* as free for reuse.
1604
* @param Head of the list of tables
1608
* The reason we reset query_id is that it's not enough to just test
1609
* if table->query_id != session->query_id to know if a table is in use.
1613
* SELECT f1_that_uses_t1() FROM t1;
1615
* In f1_that_uses_t1() we will see one instance of t1 where query_id is
1616
* set to query_id of original query.
1618
void mark_used_tables_as_free_for_reuse(Table *table);
1622
/** A short cut for session->main_da.set_ok_status(). */
1623
inline void my_ok(ha_rows affected_rows= 0, ha_rows found_rows_arg= 0,
1624
uint64_t passed_id= 0, const char *message= NULL)
1626
main_da.set_ok_status(this, affected_rows, found_rows_arg, passed_id, message);
1630
/** A short cut for session->main_da.set_eof_status(). */
1632
inline void my_eof()
1634
main_da.set_eof_status(this);
1637
/* Some inline functions for more speed */
1639
inline bool add_item_to_list(Item *item)
1641
return lex->current_select->add_item_to_list(this, item);
1644
inline bool add_value_to_list(Item *value)
1646
return lex->value_list.push_back(value);
1649
inline bool add_order_to_list(Item *item, bool asc)
1651
return lex->current_select->add_order_to_list(this, item, asc);
1654
inline bool add_group_to_list(Item *item, bool asc)
1656
return lex->current_select->add_group_to_list(this, item, asc);
1658
void refresh_status();
1659
user_var_entry *getVariable(LEX_STRING &name, bool create_if_not_exists);
1660
user_var_entry *getVariable(const std::string &name, bool create_if_not_exists);
1661
void setVariable(const std::string &name, const std::string &value);
1664
* Closes all tables used by the current substatement, or all tables
1665
* used by this thread if we are on the upper level.
1667
void close_thread_tables();
1668
void close_old_data_files(bool morph_locks= false,
1669
bool send_refresh= false);
1670
void close_open_tables();
1671
void close_data_files_and_morph_locks(const TableIdentifier &identifier);
1674
bool free_cached_table();
1678
* Prepares statement for reopening of tables and recalculation of set of
1681
* @param Pointer to a pointer to a list of tables which we were trying to open and lock
1683
void close_tables_for_reopen(TableList **tables);
1687
* Open all tables in list, locks them (all, including derived)
1689
* @param Pointer to a list of tables for open & locking
1698
* The lock will automaticaly be freed by close_thread_tables()
1700
bool openTablesLock(TableList *tables);
1702
int open_tables_from_list(TableList **start, uint32_t *counter, uint32_t flags= 0);
1704
Table *openTableLock(TableList *table_list, thr_lock_type lock_type);
1705
Table *openTable(TableList *table_list, bool *refresh, uint32_t flags= 0);
1707
void unlink_open_table(Table *find);
1708
void drop_open_table(Table *table, const TableIdentifier &identifier);
1709
void close_cached_table(Table *table);
1711
/* Create a lock in the cache */
1712
table::Placeholder *table_cache_insert_placeholder(const TableIdentifier &identifier);
1713
bool lock_table_name_if_not_cached(const TableIdentifier &identifier, Table **table);
1715
typedef boost::unordered_map<std::string, message::Table, util::insensitive_hash, util::insensitive_equal_to> TableMessageCache;
1719
TableMessageCache table_message_cache;
1722
bool storeTableMessage(const TableIdentifier &identifier, message::Table &table_message);
1723
bool removeTableMessage(const TableIdentifier &identifier);
1724
bool getTableMessage(const TableIdentifier &identifier, message::Table &table_message);
1725
bool doesTableMessageExist(const TableIdentifier &identifier);
1726
bool renameTableMessage(const TableIdentifier &from, const TableIdentifier &to);
1730
TableMessages _table_message_cache;
1733
TableMessages &getMessageCache()
1735
return _table_message_cache;
1738
/* Reopen operations */
1739
bool reopen_tables(bool get_locks, bool mark_share_as_old);
1740
bool close_cached_tables(TableList *tables, bool wait_for_refresh, bool wait_for_placeholders);
1742
void wait_for_condition(boost::mutex &mutex, boost::condition_variable_any &cond);
1743
int setup_conds(TableList *leaves, COND **conds);
1744
int lock_tables(TableList *tables, uint32_t count, bool *need_reopen);
1746
drizzled::util::Storable *getProperty(const std::string &arg)
1748
return life_properties[arg];
1752
bool setProperty(const std::string &arg, T *value)
1754
life_properties[arg]= value;
1760
Return the default storage engine
1762
@param getDefaultStorageEngine()
1765
pointer to plugin::StorageEngine
1767
plugin::StorageEngine *getDefaultStorageEngine()
1769
if (variables.storage_engine)
1770
return variables.storage_engine;
1771
return global_system_variables.storage_engine;
1774
void get_xid(DRIZZLE_XID *xid); // Innodb only
1776
table::Instance *getInstanceTable();
1777
table::Instance *getInstanceTable(List<CreateField> &field_list);
1782
if (getrusage(RUSAGE_THREAD, &usage))
1791
void setUsage(bool arg)
1796
const struct rusage &getUsage()
1802
// This lives throughout the life of Session
1804
PropertyMap life_properties;
1805
std::vector<table::Instance *> temporary_shares;
1806
struct rusage usage;
1775
1811
#define ESCAPE_CHARS "ntrb0ZN" // keep synchronous with READ_INFO::unescape
1779
List of all possible characters of a numeric value text representation.
1781
#define NUMERIC_CHARS ".0123456789e+-"
1784
class select_export :public select_to_file {
1785
uint32_t field_term_length;
1786
int field_sep_char,escape_char,line_sep_char;
1787
int field_term_char; // first char of FIELDS TERMINATED BY or MAX_INT
1789
The is_ambiguous_field_sep field is true if a value of the field_sep_char
1790
field is one of the 'n', 't', 'r' etc characters
1791
(see the READ_INFO::unescape method and the ESCAPE_CHARS constant value).
1793
bool is_ambiguous_field_sep;
1795
The is_ambiguous_field_term is true if field_sep_char contains the first
1796
char of the FIELDS TERMINATED BY (ENCLOSED BY is empty), and items can
1797
contain this character.
1799
bool is_ambiguous_field_term;
1801
The is_unsafe_field_sep field is true if a value of the field_sep_char
1802
field is one of the '0'..'9', '+', '-', '.' and 'e' characters
1803
(see the NUMERIC_CHARS constant value).
1805
bool is_unsafe_field_sep;
1806
bool fixed_row_size;
1808
select_export(sql_exchange *ex) :select_to_file(ex) {}
1810
int prepare(List<Item> &list, SELECT_LEX_UNIT *u);
1811
bool send_data(List<Item> &items);
1815
class select_dump :public select_to_file {
1817
select_dump(sql_exchange *ex) :select_to_file(ex) {}
1818
int prepare(List<Item> &list, SELECT_LEX_UNIT *u);
1819
bool send_data(List<Item> &items);
1823
class select_insert :public select_result_interceptor {
1825
TableList *table_list;
1828
uint64_t autoinc_value_of_last_inserted_row; // autogenerated or not
1830
bool insert_into_view;
1831
select_insert(TableList *table_list_par,
1832
Table *table_par, List<Item> *fields_par,
1833
List<Item> *update_fields, List<Item> *update_values,
1834
enum_duplicates duplic, bool ignore);
1836
int prepare(List<Item> &list, SELECT_LEX_UNIT *u);
1837
virtual int prepare2(void);
1838
bool send_data(List<Item> &items);
1839
virtual void store_values(List<Item> &values);
1840
virtual bool can_rollback_data() { return 0; }
1841
void send_error(uint32_t errcode,const char *err);
1844
/* not implemented: select_insert is never re-used in prepared statements */
1849
class select_create: public select_insert {
1851
TableList *create_table;
1852
HA_CREATE_INFO *create_info;
1853
TableList *select_tables;
1854
Alter_info *alter_info;
1856
/* lock data for tmp table */
1857
DRIZZLE_LOCK *m_lock;
1858
/* m_lock or session->extra_lock */
1859
DRIZZLE_LOCK **m_plock;
1861
select_create (TableList *table_arg,
1862
HA_CREATE_INFO *create_info_par,
1863
Alter_info *alter_info_arg,
1864
List<Item> &select_fields,enum_duplicates duplic, bool ignore,
1865
TableList *select_tables_arg)
1866
:select_insert (NULL, NULL, &select_fields, 0, 0, duplic, ignore),
1867
create_table(table_arg),
1868
create_info(create_info_par),
1869
select_tables(select_tables_arg),
1870
alter_info(alter_info_arg),
1873
int prepare(List<Item> &list, SELECT_LEX_UNIT *u);
1875
void binlog_show_create_table(Table **tables, uint32_t count);
1876
void store_values(List<Item> &values);
1877
void send_error(uint32_t errcode,const char *err);
1880
virtual bool can_rollback_data() { return 1; }
1882
// Needed for access from local class MY_HOOKS in prepare(), since session is proteted.
1883
const Session *get_session(void) { return session; }
1884
const HA_CREATE_INFO *get_create_info() { return create_info; };
1885
int prepare2(void) { return 0; }
1888
#include <storage/myisam/myisam.h>
1891
Param to create temporary tables when doing SELECT:s
1893
This structure is copied using memcpy as a part of JOIN.
1896
class TMP_TABLE_PARAM :public Sql_alloc
1899
/* Prevent use of these (not safe because of lists and copy_field) */
1900
TMP_TABLE_PARAM(const TMP_TABLE_PARAM &);
1901
void operator=(TMP_TABLE_PARAM &);
1904
List<Item> copy_funcs;
1905
List<Item> save_copy_funcs;
1906
Copy_field *copy_field, *copy_field_end;
1907
Copy_field *save_copy_field, *save_copy_field_end;
1908
unsigned char *group_buff;
1909
Item **items_to_copy; /* Fields in tmp table */
1910
MI_COLUMNDEF *recinfo,*start_recinfo;
1912
ha_rows end_write_records;
1913
uint field_count,sum_func_count,func_count;
1914
uint32_t hidden_field_count;
1915
uint group_parts,group_length,group_null_parts;
1917
bool using_indirect_summary_function;
1918
/* If >0 convert all blob fields to varchar(convert_blob_length) */
1919
uint32_t convert_blob_length;
1920
const CHARSET_INFO *table_charset;
1923
True if GROUP BY and its aggregate functions are already computed
1924
by a table access method (e.g. by loose index scan). In this case
1925
query execution should not perform aggregation and should treat
1926
aggregate functions as normal functions.
1928
bool precomputed_group_by;
1929
bool force_copy_fields;
1931
If true, create_tmp_field called from create_tmp_table will convert
1932
all BIT fields to 64-bit longs. This is a workaround the limitation
1933
that MEMORY tables cannot index BIT columns.
1935
bool bit_fields_as_long;
1938
:copy_field(0), group_parts(0),
1939
group_length(0), group_null_parts(0), convert_blob_length(0),
1940
schema_table(0), precomputed_group_by(0), force_copy_fields(0),
1941
bit_fields_as_long(0)
1951
class select_union :public select_result_interceptor
1953
TMP_TABLE_PARAM tmp_table_param;
1957
select_union() :table(0) {}
1958
int prepare(List<Item> &list, SELECT_LEX_UNIT *u);
1959
bool send_data(List<Item> &items);
1963
bool create_result_table(Session *session, List<Item> *column_types,
1964
bool is_distinct, uint64_t options,
1965
const char *alias, bool bit_fields_as_long);
1968
/* Base subselect interface class */
1969
class select_subselect :public select_result_interceptor
1972
Item_subselect *item;
1974
select_subselect(Item_subselect *item);
1975
bool send_data(List<Item> &items)=0;
1976
bool send_eof() { return 0; };
1979
/* Single value subselect interface class */
1980
class select_singlerow_subselect :public select_subselect
1983
select_singlerow_subselect(Item_subselect *item_arg)
1984
:select_subselect(item_arg)
1986
bool send_data(List<Item> &items);
1989
/* used in independent ALL/ANY optimisation */
1990
class select_max_min_finder_subselect :public select_subselect
1993
bool (select_max_min_finder_subselect::*op)();
1996
select_max_min_finder_subselect(Item_subselect *item_arg, bool mx)
1997
:select_subselect(item_arg), cache(0), fmax(mx)
2000
bool send_data(List<Item> &items);
2007
/* EXISTS subselect interface class */
2008
class select_exists_subselect :public select_subselect
2011
select_exists_subselect(Item_subselect *item_arg)
2012
:select_subselect(item_arg){}
2013
bool send_data(List<Item> &items);
2016
/* Structs used when sorting */
2018
typedef struct st_sort_field {
2019
Field *field; /* Field to sort */
2020
Item *item; /* Item if not sorting fields */
2021
uint length; /* Length of sort field */
2022
uint32_t suffix_length; /* Length suffix (0-4) */
2023
Item_result result_type; /* Type of item */
2024
bool reverse; /* if descending sort */
2025
bool need_strxnfrm; /* If we have to use strxnfrm() */
2029
typedef struct st_sort_buffer {
2030
uint32_t index; /* 0 or 1 */
2031
uint32_t sort_orders;
2032
uint32_t change_pos; /* If sort-fields changed */
2034
SORT_FIELD *sortorder;
2037
/* Structure for db & table in sql_yacc */
2039
class Table_ident :public Sql_alloc
2044
SELECT_LEX_UNIT *sel;
2045
inline Table_ident(Session *session, LEX_STRING db_arg, LEX_STRING table_arg,
2047
:table(table_arg), sel((SELECT_LEX_UNIT *)0)
2049
if (!force && (session->client_capabilities & CLIENT_NO_SCHEMA))
2054
inline Table_ident(LEX_STRING table_arg)
2055
:table(table_arg), sel((SELECT_LEX_UNIT *)0)
2060
This constructor is used only for the case when we create a derived
2061
table. A derived table has no name and doesn't belong to any database.
2062
Later, if there was an alias specified for the table, it will be set
2063
by add_table_to_list.
2065
inline Table_ident(SELECT_LEX_UNIT *s) : sel(s)
2067
/* We must have a table name here as this is used with add_table_to_list */
2068
db.str= empty_c_string; /* a subject to casedn_str */
2070
table.str= internal_table_name;
2073
bool is_derived_table() const { return test(sel); }
2074
inline void change_db(char *db_name)
2076
db.str= db_name; db.length= (uint) strlen(db_name);
2080
// this is needed for user_vars hash
2081
class user_var_entry
2084
user_var_entry() {} /* Remove gcc warning */
2088
query_id_t update_query_id, used_query_id;
2092
double val_real(bool *null_value);
2093
int64_t val_int(bool *null_value) const;
2094
String *val_str(bool *null_value, String *str, uint32_t decimals);
2095
my_decimal *val_decimal(bool *null_value, my_decimal *result);
2096
DTCollation collation;
2100
Unique -- class for unique (removing of duplicates).
2101
Puts all values to the TREE. If the tree becomes too big,
2102
it's dumped to the file. User can request sorted values, or
2103
just iterate through them. In the last case tree merging is performed in
2104
memory simultaneously with iteration, so it should be ~2-3x faster.
1813
} /* namespace drizzled */
1815
/** @TODO why is this in the middle of the file */
1816
#include <drizzled/select_to_file.h>
1817
#include <drizzled/select_export.h>
1818
#include <drizzled/select_dump.h>
1819
#include <drizzled/select_insert.h>
1820
#include <drizzled/select_create.h>
1821
#include <drizzled/tmp_table_param.h>
1822
#include <drizzled/select_union.h>
1823
#include <drizzled/select_subselect.h>
1824
#include <drizzled/select_singlerow_subselect.h>
1825
#include <drizzled/select_max_min_finder_subselect.h>
1826
#include <drizzled/select_exists_subselect.h>
1832
* A structure used to describe sort information
1833
* for a field or item used in ORDER BY.
2107
class Unique :public Sql_alloc
2109
DYNAMIC_ARRAY file_ptrs;
2111
uint64_t max_in_memory_size;
2114
unsigned char *record_pointers;
2120
Unique(qsort_cmp2 comp_func, void *comp_func_fixed_arg,
2121
uint32_t size_arg, uint64_t max_in_memory_size_arg);
2123
ulong elements_in_tree() { return tree.elements_in_tree; }
2124
inline bool unique_add(void *ptr)
2126
if (tree.elements_in_tree > max_elements && flush())
2128
return(!tree_insert(&tree, ptr, 0, tree.custom_arg));
2131
bool get(Table *table);
2132
static double get_use_cost(uint32_t *buffer, uint32_t nkeys, uint32_t key_size,
2133
uint64_t max_in_memory_size);
2134
inline static int get_cost_calc_buff_size(ulong nkeys, uint32_t key_size,
2135
uint64_t max_in_memory_size)
2137
register uint64_t max_elems_in_tree=
2138
(1 + max_in_memory_size / ALIGN_SIZE(sizeof(TREE_ELEMENT)+key_size));
2139
return (int) (sizeof(uint)*(1 + nkeys/max_elems_in_tree));
2143
bool walk(tree_walk_action action, void *walk_action_arg);
2145
friend int unique_write_to_file(unsigned char* key, element_count count, Unique *unique);
2146
friend int unique_write_to_ptrs(unsigned char* key, element_count count, Unique *unique);
2150
class multi_delete :public select_result_interceptor
2152
TableList *delete_tables, *table_being_deleted;
2154
ha_rows deleted, found;
2155
uint32_t num_of_tables;
2158
/* True if at least one table we delete from is transactional */
2159
bool transactional_tables;
2160
/* True if at least one table we delete from is not transactional */
2162
bool delete_while_scanning;
2164
error handling (rollback and binlogging) can happen in send_eof()
2165
so that afterward send_error() needs to find out that.
2170
multi_delete(TableList *dt, uint32_t num_of_tables);
2172
int prepare(List<Item> &list, SELECT_LEX_UNIT *u);
2173
bool send_data(List<Item> &items);
2174
bool initialize_tables (JOIN *join);
2175
void send_error(uint32_t errcode,const char *err);
2178
virtual void abort();
2182
class multi_update :public select_result_interceptor
2184
TableList *all_tables; /* query/update command tables */
2185
TableList *leaves; /* list of leves of join table tree */
2186
TableList *update_tables, *table_being_updated;
2187
Table **tmp_tables, *main_table, *table_to_update;
2188
TMP_TABLE_PARAM *tmp_table_param;
2189
ha_rows updated, found;
2190
List <Item> *fields, *values;
2191
List <Item> **fields_for_table, **values_for_table;
2192
uint32_t table_count;
2194
List of tables referenced in the CHECK OPTION condition of
2195
the updated view excluding the updated table.
2197
List <Table> unupdated_check_opt_tables;
2198
Copy_field *copy_field;
2199
enum enum_duplicates handle_duplicates;
2200
bool do_update, trans_safe;
2201
/* True if the update operation has made a change in a transactional table */
2202
bool transactional_tables;
2205
error handling (rollback and binlogging) can happen in send_eof()
2206
so that afterward send_error() needs to find out that.
2211
multi_update(TableList *ut, TableList *leaves_list,
2212
List<Item> *fields, List<Item> *values,
2213
enum_duplicates handle_duplicates, bool ignore);
2215
int prepare(List<Item> &list, SELECT_LEX_UNIT *u);
2216
bool send_data(List<Item> &items);
2217
bool initialize_tables (JOIN *join);
2218
void send_error(uint32_t errcode,const char *err);
2221
virtual void abort();
2224
class my_var : public Sql_alloc {
2229
enum_field_types type;
2230
my_var (LEX_STRING& j, bool i, uint32_t o, enum_field_types t)
2231
:s(j), local(i), offset(o), type(t)
2236
class select_dumpvar :public select_result_interceptor {
2239
List<my_var> var_list;
2240
select_dumpvar() { var_list.empty(); row_count= 0;}
2241
~select_dumpvar() {}
2242
int prepare(List<Item> &list, SELECT_LEX_UNIT *u);
2243
bool send_data(List<Item> &items);
2245
virtual bool check_simple_select() const;
1838
Field *field; /**< Field to sort */
1839
Item *item; /**< Item if not sorting fields */
1840
size_t length; /**< Length of sort field */
1841
uint32_t suffix_length; /**< Length suffix (0-4) */
1842
Item_result result_type; /**< Type of item */
1843
bool reverse; /**< if descending sort */
1844
bool need_strxnfrm; /**< If we have to use strxnfrm() */
1851
result_type(STRING_RESULT),
1858
} /* namespace drizzled */
1860
/** @TODO why is this in the middle of the file */
1862
#include <drizzled/table_ident.h>
1863
#include <drizzled/user_var_entry.h>
1864
#include <drizzled/unique.h>
1865
#include <drizzled/var.h>
1866
#include <drizzled/select_dumpvar.h>
2249
1871
/* Bits in sql_command_flags */
2251
enum sql_command_flag_bits {
1873
enum sql_command_flag_bits
2252
1875
CF_BIT_CHANGES_DATA,
2253
1876
CF_BIT_HAS_ROW_COUNT,
2254
1877
CF_BIT_STATUS_COMMAND,