mirror/mariadb
1
0
Fork 0
mirror of https://github.com/MariaDB/server.git synced 2025-01-16 12:02:42 +01:00
Code Issues Projects Releases Packages Wiki Activity Actions
mariadb/sql/event.cc
unknown 11c7dbd3a5 fix compiler warnings: precision loses, unused vars 
the warnings came from MSFT compiler (output of pushbuild)


sql/event.cc:
  fix compiler warnings: precision loses, unused vars
sql/event_executor.cc:
  fix compiler warnings: precision loses, unused vars
sql/event_timed.cc:
  fix compiler warnings: precision loses, unused vars
2006-02-28 20:32:37 +01:00

1606 lines
45 KiB
C++
Raw Blame History

/* Copyright (C) 2004-2005 MySQL AB
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; either version 2 of the License, or
(at your option) any later version.
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
#include "event_priv.h"
#include "event.h"
#include "sp.h"
/*
TODO list :
- The default value of created/modified should not be 0000-00-00 because of
STRICT mode restricions.
- CREATE EVENT should not go into binary log! Does it now? The SQL statements
issued by the EVENT are replicated.
I have an idea how to solve the problem at failover. So the status field
will be ENUM('DISABLED', 'ENABLED', 'SLAVESIDE_DISABLED').
In this case when CREATE EVENT is replicated it should go into the binary
as SLAVESIDE_DISABLED if it is ENABLED, when it's created as DISABLEd it
should be replicated as disabled. If an event is ALTERed as DISABLED the
query should go untouched into the binary log, when ALTERed as enable then
it should go as SLAVESIDE_DISABLED. This is regarding the SQL interface.
TT routines however modify mysql.event internally and this does not go the log
so in this case queries has to be injected into the log...somehow... or
maybe a solution is RBR for this case, because the event may go only from
ENABLED to DISABLED status change and this is safe for replicating. As well
an event may be deleted which is also safe for RBR.
- Maybe move all allocations during parsing to evex_mem_root thus saving
double parsing in evex_create_event!
- If the server is killed (stopping) try to kill executing events?
- What happens if one renames an event in the DB while it is in memory?
Or even deleting it?
- Consider using conditional variable when doing shutdown instead of
waiting till all worker threads end.
- Make Event_timed::get_show_create_event() work
- Add logging to file
- Move comparison code to class Event_timed
Warning:
- For now parallel execution is not possible because the same sp_head cannot be
executed few times!!! There is still no lock attached to particular event.
*/
QUEUE EVEX_EQ_NAME;
MEM_ROOT evex_mem_root;
time_t mysql_event_last_create_time= 0L;
static TABLE_FIELD_W_TYPE event_table_fields[EVEX_FIELD_COUNT] = {
{
{(char *) STRING_WITH_LEN("db")},
{(char *) STRING_WITH_LEN("char(64)")},
{(char *) STRING_WITH_LEN("utf8")}
},
{
{(char *) STRING_WITH_LEN("name")},
{(char *) STRING_WITH_LEN("char(64)")},
{(char *) STRING_WITH_LEN("utf8")}
},
{
{(char *) STRING_WITH_LEN("body")},
{(char *) STRING_WITH_LEN("longblob")},
{NULL, 0}
},
{
{(char *) STRING_WITH_LEN("definer")},
{(char *) STRING_WITH_LEN("char(77)")},
{(char *) STRING_WITH_LEN("utf8")}
},
{
{(char *) STRING_WITH_LEN("execute_at")},
{(char *) STRING_WITH_LEN("datetime")},
{NULL, 0}
},
{
{(char *) STRING_WITH_LEN("interval_value")},
{(char *) STRING_WITH_LEN("int(11)")},
{NULL, 0}
},
{
{(char *) STRING_WITH_LEN("interval_field")},
{(char *) STRING_WITH_LEN("enum('YEAR','QUARTER','MONTH','DAY',"
"'HOUR','MINUTE','WEEK','SECOND','MICROSECOND','YEAR_MONTH','DAY_HOUR',"
"'DAY_MINUTE','DAY_SECOND','HOUR_MINUTE','HOUR_SECOND','MINUTE_SECOND',"
"'DAY_MICROSECOND','HOUR_MICROSECOND','MINUTE_MICROSECOND',"
"'SECOND_MICROSECOND')")},
{NULL, 0}
},
{
{(char *) STRING_WITH_LEN("created")},
{(char *) STRING_WITH_LEN("timestamp")},
{NULL, 0}
},
{
{(char *) STRING_WITH_LEN("modified")},
{(char *) STRING_WITH_LEN("timestamp")},
{NULL, 0}
},
{
{(char *) STRING_WITH_LEN("last_executed")},
{(char *) STRING_WITH_LEN("datetime")},
{NULL, 0}
},
{
{(char *) STRING_WITH_LEN("starts")},
{(char *) STRING_WITH_LEN("datetime")},
{NULL, 0}
},
{
{(char *) STRING_WITH_LEN("ends")},
{(char *) STRING_WITH_LEN("datetime")},
{NULL, 0}
},
{
{(char *) STRING_WITH_LEN("status")},
{(char *) STRING_WITH_LEN("enum('ENABLED','DISABLED')")},
{NULL, 0}
},
{
{(char *) STRING_WITH_LEN("on_completion")},
{(char *) STRING_WITH_LEN("enum('DROP','PRESERVE')")},
{NULL, 0}
},
{
{(char *) STRING_WITH_LEN("sql_mode")},
{(char *) STRING_WITH_LEN("set('REAL_AS_FLOAT','PIPES_AS_CONCAT','ANSI_QUOTES',"
"'IGNORE_SPACE','NOT_USED','ONLY_FULL_GROUP_BY','NO_UNSIGNED_SUBTRACTION',"
"'NO_DIR_IN_CREATE','POSTGRESQL','ORACLE','MSSQL','DB2','MAXDB',"
"'NO_KEY_OPTIONS','NO_TABLE_OPTIONS','NO_FIELD_OPTIONS','MYSQL323','MYSQL40',"
"'ANSI','NO_AUTO_VALUE_ON_ZERO','NO_BACKSLASH_ESCAPES','STRICT_TRANS_TABLES',"
"'STRICT_ALL_TABLES','NO_ZERO_IN_DATE','NO_ZERO_DATE','INVALID_DATES',"
"'ERROR_FOR_DIVISION_BY_ZERO','TRADITIONAL','NO_AUTO_CREATE_USER',"
"'HIGH_NOT_PRECEDENCE')")},
{NULL, 0}
},
{
{(char *) STRING_WITH_LEN("comment")},
{(char *) STRING_WITH_LEN("char(64)")},
{(char *) STRING_WITH_LEN("utf8")}
}
};
LEX_STRING interval_type_to_name[] = {
{(char *) STRING_WITH_LEN("YEAR")},
{(char *) STRING_WITH_LEN("QUARTER")},
{(char *) STRING_WITH_LEN("MONTH")},
{(char *) STRING_WITH_LEN("DAY")},
{(char *) STRING_WITH_LEN("HOUR")},
{(char *) STRING_WITH_LEN("MINUTE")},
{(char *) STRING_WITH_LEN("WEEK")},
{(char *) STRING_WITH_LEN("SECOND")},
{(char *) STRING_WITH_LEN("MICROSECOND")},
{(char *) STRING_WITH_LEN("YEAR_MONTH")},
{(char *) STRING_WITH_LEN("DAY_HOUR")},
{(char *) STRING_WITH_LEN("DAY_MINUTE")},
{(char *) STRING_WITH_LEN("DAY_SECOND")},
{(char *) STRING_WITH_LEN("HOUR_MINUTE")},
{(char *) STRING_WITH_LEN("HOUR_SECOND")},
{(char *) STRING_WITH_LEN("MINUTE_SECOND")},
{(char *) STRING_WITH_LEN("DAY_MICROSECOND")},
{(char *) STRING_WITH_LEN("HOUR_MICROSECOND")},
{(char *) STRING_WITH_LEN("MINUTE_MICROSECOND")},
{(char *) STRING_WITH_LEN("SECOND_MICROSECOND")}
};
/*
Inits the scheduler queue - prioritized queue from mysys/queue.c
Synopsis
evex_queue_init()
queue - pointer the the memory to be initialized as queue. has to be
allocated from the caller
Notes
During initialization the queue is sized for 30 events, and when is full
will auto extent with 30.
*/
void
evex_queue_init(EVEX_QUEUE_TYPE *queue)
{
if (init_queue_ex(queue, 30 /*num_el*/, 0 /*offset*/, 0 /*smallest_on_top*/,
event_timed_compare_q, NULL, 30 /*auto_extent*/))
sql_print_error("Insufficient memory to initialize executing queue.");
}
/*
Compares 2 LEX strings regarding case.
Synopsis
my_time_compare()
s - first LEX_STRING
t - second LEX_STRING
cs - charset
RETURNS:
-1 - s < t
0 - s == t
1 - s > t
Notes
TIME.second_part is not considered during comparison
*/
int sortcmp_lex_string(LEX_STRING s, LEX_STRING t, CHARSET_INFO *cs)
{
return cs->coll->strnncollsp(cs, (unsigned char *) s.str,s.length,
(unsigned char *) t.str,t.length, 0);
}
/*
Compares 2 TIME structures
Synopsis
my_time_compare()
a - first TIME
b - second time
RETURNS:
-1 - a < b
0 - a == b
1 - a > b
Notes
TIME.second_part is not considered during comparison
*/
int
my_time_compare(TIME *a, TIME *b)
{
#ifdef ENABLE_WHEN_WE_HAVE_MILLISECOND_IN_TIMESTAMPS
my_ulonglong a_t= TIME_to_ulonglong_datetime(a)*100L + a->second_part;
my_ulonglong b_t= TIME_to_ulonglong_datetime(b)*100L + b->second_part;
#else
my_ulonglong a_t= TIME_to_ulonglong_datetime(a);
my_ulonglong b_t= TIME_to_ulonglong_datetime(b);
#endif
if (a_t > b_t)
return 1;
else if (a_t < b_t)
return -1;
return 0;
}
/*
Compares the execute_at members of 2 Event_timed instances
Synopsis
event_timed_compare()
a - first Event_timed object
b - second Event_timed object
RETURNS:
-1 - a->execute_at < b->execute_at
0 - a->execute_at == b->execute_at
1 - a->execute_at > b->execute_at
Notes
execute_at.second_part is not considered during comparison
*/
int
event_timed_compare(Event_timed *a, Event_timed *b)
{
return my_time_compare(&a->execute_at, &b->execute_at);
}
/*
Compares the execute_at members of 2 Event_timed instances.
Used as callback for the prioritized queue when shifting
elements inside.
Synopsis
event_timed_compare()
vptr - not used (set it to NULL)
a - first Event_timed object
b - second Event_timed object
RETURNS:
-1 - a->execute_at < b->execute_at
0 - a->execute_at == b->execute_at
1 - a->execute_at > b->execute_at
Notes
execute_at.second_part is not considered during comparison
*/
int
event_timed_compare_q(void *vptr, byte* a, byte *b)
{
return event_timed_compare((Event_timed *)a, (Event_timed *)b);
}
/*
Reconstructs interval expression from interval type and expression
value that is in form of a value of the smalles entity:
For
YEAR_MONTH - expression is in months
DAY_MINUTE - expression is in minutes
Synopsis
event_reconstruct_interval_expression()
buf - preallocated String buffer to add the value to
interval - the interval type (for instance YEAR_MONTH)
expression - the value in the lowest entity
RETURNS
0 - OK
1 - Error
*/
int
event_reconstruct_interval_expression(String *buf,
interval_type interval,
longlong expression)
{
ulonglong expr= expression;
char tmp_buff[128], *end;
bool close_quote= TRUE;
int multipl= 0;
char separator=':';
switch (interval) {
case INTERVAL_YEAR_MONTH:
multipl= 12;
separator= '-';
goto common_1_lev_code;
case INTERVAL_DAY_HOUR:
multipl= 24;
separator= ' ';
goto common_1_lev_code;
case INTERVAL_HOUR_MINUTE:
case INTERVAL_MINUTE_SECOND:
multipl= 60;
common_1_lev_code:
buf->append('\'');
end= longlong10_to_str(expression/multipl, tmp_buff, 10);
buf->append(tmp_buff, (uint) (end- tmp_buff));
expr= expr - (expr/multipl)*multipl;
break;
case INTERVAL_DAY_MINUTE:
{
ulonglong tmp_expr= expr;
tmp_expr/=(24*60);
buf->append('\'');
end= longlong10_to_str(tmp_expr, tmp_buff, 10);
buf->append(tmp_buff, (uint) (end- tmp_buff));// days
buf->append(' ');
tmp_expr= expr - tmp_expr*(24*60);//minutes left
end= longlong10_to_str(tmp_expr/60, tmp_buff, 10);
buf->append(tmp_buff, (uint) (end- tmp_buff));// hours
expr= tmp_expr - (tmp_expr/60)*60;
/* the code after the switch will finish */
}
break;
case INTERVAL_HOUR_SECOND:
{
ulonglong tmp_expr= expr;
buf->append('\'');
end= longlong10_to_str(tmp_expr/3600, tmp_buff, 10);
buf->append(tmp_buff, (uint) (end- tmp_buff));// hours
buf->append(':');
tmp_expr= tmp_expr - (tmp_expr/3600)*3600;
end= longlong10_to_str(tmp_expr/60, tmp_buff, 10);
buf->append(tmp_buff, (uint) (end- tmp_buff));// minutes
expr= tmp_expr - (tmp_expr/60)*60;
/* the code after the switch will finish */
}
break;
case INTERVAL_DAY_SECOND:
{
ulonglong tmp_expr= expr;
tmp_expr/=(24*3600);
buf->append('\'');
end= longlong10_to_str(tmp_expr, tmp_buff, 10);
buf->append(tmp_buff, (uint) (end- tmp_buff));// days
buf->append(' ');
tmp_expr= expr - tmp_expr*(24*3600);//seconds left
end= longlong10_to_str(tmp_expr/3600, tmp_buff, 10);
buf->append(tmp_buff, (uint) (end- tmp_buff));// hours
buf->append(':');
tmp_expr= tmp_expr - (tmp_expr/3600)*3600;
end= longlong10_to_str(tmp_expr/60, tmp_buff, 10);
buf->append(tmp_buff, (uint) (end- tmp_buff));// minutes
expr= tmp_expr - (tmp_expr/60)*60;
/* the code after the switch will finish */
}
break;
case INTERVAL_DAY_MICROSECOND:
case INTERVAL_HOUR_MICROSECOND:
case INTERVAL_MINUTE_MICROSECOND:
case INTERVAL_SECOND_MICROSECOND:
case INTERVAL_MICROSECOND:
my_error(ER_NOT_SUPPORTED_YET, MYF(0), "MICROSECOND");
return 1;
break;
case INTERVAL_QUARTER:
expr/= 3;
close_quote= FALSE;
break;
case INTERVAL_WEEK:
expr/= 7;
default:
close_quote= FALSE;
break;
}
if (close_quote)
buf->append(separator);
end= longlong10_to_str(expr, tmp_buff, 10);
buf->append(tmp_buff, (uint) (end- tmp_buff));
if (close_quote)
buf->append('\'');
return 0;
}
/*
Open mysql.event table for read
SYNOPSIS
evex_open_event_table_for_read()
thd Thread context
lock_type How to lock the table
table The table pointer
RETURN
1 Cannot lock table
2 The table is corrupted - different number of fields
0 OK
*/
int
evex_open_event_table(THD *thd, enum thr_lock_type lock_type, TABLE **table)
{
TABLE_LIST tables;
DBUG_ENTER("open_proc_table");
bzero((char*) &tables, sizeof(tables));
tables.db= (char*) "mysql";
tables.table_name= tables.alias= (char*) "event";
tables.lock_type= lock_type;
if (simple_open_n_lock_tables(thd, &tables))
DBUG_RETURN(1);
if (table_check_intact(tables.table, EVEX_FIELD_COUNT, event_table_fields,
&mysql_event_last_create_time,
ER_CANNOT_LOAD_FROM_TABLE))
{
close_thread_tables(thd);
DBUG_RETURN(2);
}
*table= tables.table;
DBUG_RETURN(0);
}
/*
Find row in open mysql.event table representing event
SYNOPSIS
evex_db_find_event_aux()
thd Thread context
et evet_timed object containing dbname, name & definer
table TABLE object for open mysql.event table.
RETURN VALUE
0 - Routine found
EVEX_KEY_NOT_FOUND - No routine with given name
*/
inline int
evex_db_find_event_aux(THD *thd, Event_timed *et, TABLE *table)
{
return evex_db_find_event_by_name(thd, et->dbname, et->name,
et->definer, table);
}
/*
Find row in open mysql.event table representing event
SYNOPSIS
evex_db_find_event_by_name()
thd Thread context
dbname Name of event's database
rname Name of the event inside the db
table TABLE object for open mysql.event table.
RETURN VALUE
0 - Routine found
EVEX_KEY_NOT_FOUND - No routine with given name
*/
int
evex_db_find_event_by_name(THD *thd, const LEX_STRING dbname,
const LEX_STRING ev_name,
const LEX_STRING user_name,
TABLE *table)
{
byte key[MAX_KEY_LENGTH];
DBUG_ENTER("evex_db_find_event_by_name");
DBUG_PRINT("enter", ("name: %.*s", ev_name.length, ev_name.str));
/*
Create key to find row. We have to use field->store() to be able to
handle VARCHAR and CHAR fields.
Assumption here is that the two first fields in the table are
'db' and 'name' and the first key is the primary key over the
same fields.
*/
if (dbname.length > table->field[EVEX_FIELD_DB]->field_length ||
ev_name.length > table->field[EVEX_FIELD_NAME]->field_length ||
user_name.length > table->field[EVEX_FIELD_DEFINER]->field_length)
DBUG_RETURN(EVEX_KEY_NOT_FOUND);
table->field[EVEX_FIELD_DB]->store(dbname.str, dbname.length, &my_charset_bin);
table->field[EVEX_FIELD_NAME]->store(ev_name.str, ev_name.length,
&my_charset_bin);
table->field[EVEX_FIELD_DEFINER]->store(user_name.str, user_name.length,
&my_charset_bin);
key_copy(key, table->record[0], table->key_info, table->key_info->key_length);
if (table->file->index_read_idx(table->record[0], 0, key,
table->key_info->key_length,HA_READ_KEY_EXACT))
DBUG_RETURN(EVEX_KEY_NOT_FOUND);
DBUG_RETURN(0);
}
/*
Puts some data common to CREATE and ALTER EVENT into a row.
SYNOPSIS
evex_fill_row()
thd THD
table the row to fill out
et Event's data
Returns
0 - ok
EVEX_GENERAL_ERROR - bad data
EVEX_GET_FIELD_FAILED - field count does not match. table corrupted?
DESCRIPTION
Used both when an event is created and when it is altered.
*/
static int
evex_fill_row(THD *thd, TABLE *table, Event_timed *et, my_bool is_update)
{
enum evex_table_field field_num;
DBUG_ENTER("evex_fill_row");
DBUG_PRINT("info", ("dbname=[%s]", et->dbname.str));
DBUG_PRINT("info", ("name =[%s]", et->name.str));
DBUG_PRINT("info", ("body =[%s]", et->body.str));
if (table->field[field_num= EVEX_FIELD_DB]->
store(et->dbname.str, et->dbname.length, system_charset_info))
goto trunc_err;
if (table->field[field_num= EVEX_FIELD_NAME]->
store(et->name.str, et->name.length, system_charset_info))
goto trunc_err;
/* both ON_COMPLETION and STATUS are NOT NULL thus not calling set_notnull() */
table->field[EVEX_FIELD_ON_COMPLETION]->store((longlong)et->on_completion,
true);
table->field[EVEX_FIELD_STATUS]->store((longlong)et->status, true);
/*
Change the SQL_MODE only if body was present in an ALTER EVENT and of course
always during CREATE EVENT.
*/
if (et->body.str)
{
table->field[EVEX_FIELD_SQL_MODE]->store((longlong)thd->variables.sql_mode,
true);
if (table->field[field_num= EVEX_FIELD_BODY]->
store(et->body.str, et->body.length, system_charset_info))
goto trunc_err;
}
if (et->expression)
{
table->field[EVEX_FIELD_INTERVAL_EXPR]->set_notnull();
table->field[EVEX_FIELD_INTERVAL_EXPR]->store((longlong)et->expression,true);
table->field[EVEX_FIELD_TRANSIENT_INTERVAL]->set_notnull();
/*
In the enum (C) intervals start from 0 but in mysql enum valid values start
from 1. Thus +1 offset is needed!
*/
table->field[EVEX_FIELD_TRANSIENT_INTERVAL]->store((longlong)et->interval+1,
true);
table->field[EVEX_FIELD_EXECUTE_AT]->set_null();
if (!et->starts_null)
{
table->field[EVEX_FIELD_STARTS]->set_notnull();
table->field[EVEX_FIELD_STARTS]->
store_time(&et->starts, MYSQL_TIMESTAMP_DATETIME);
}
if (!et->ends_null)
{
table->field[EVEX_FIELD_ENDS]->set_notnull();
table->field[EVEX_FIELD_ENDS]->
store_time(&et->ends, MYSQL_TIMESTAMP_DATETIME);
}
}
else if (et->execute_at.year)
{
table->field[EVEX_FIELD_INTERVAL_EXPR]->set_null();
table->field[EVEX_FIELD_TRANSIENT_INTERVAL]->set_null();
table->field[EVEX_FIELD_STARTS]->set_null();
table->field[EVEX_FIELD_ENDS]->set_null();
table->field[EVEX_FIELD_EXECUTE_AT]->set_notnull();
table->field[EVEX_FIELD_EXECUTE_AT]->store_time(&et->execute_at,
MYSQL_TIMESTAMP_DATETIME);
}
else
{
DBUG_ASSERT(is_update);
/*
it is normal to be here when the action is update
this is an error if the action is create. something is borked
*/
}
((Field_timestamp *)table->field[EVEX_FIELD_MODIFIED])->set_time();
if (et->comment.str)
{
if (table->field[field_num= EVEX_FIELD_COMMENT]->store(et->comment.str,
et->comment.length,
system_charset_info))
goto trunc_err;
}
DBUG_RETURN(0);
trunc_err:
my_error(ER_EVENT_DATA_TOO_LONG, MYF(0), table->field[field_num]->field_name);
DBUG_RETURN(EVEX_GENERAL_ERROR);
}
/*
Creates an event in mysql.event
SYNOPSIS
db_create_event()
thd THD
et Event_timed object containing information for the event
create_if_not - if an warning should be generated in case event exists
rows_affected - how many rows were affected
Return value
0 - OK
EVEX_GENERAL_ERROR - Failure
DESCRIPTION
Creates an event. Relies on evex_fill_row which is shared with
db_update_event. The name of the event is inside "et".
*/
static int
db_create_event(THD *thd, Event_timed *et, my_bool create_if_not,
uint *rows_affected)
{
int ret= 0;
TABLE *table;
char olddb[128];
bool dbchanged= false;
DBUG_ENTER("db_create_event");
DBUG_PRINT("enter", ("name: %.*s", et->name.length, et->name.str));
*rows_affected= 0;
DBUG_PRINT("info", ("open mysql.event for update"));
if (evex_open_event_table(thd, TL_WRITE, &table))
{
my_error(ER_EVENT_OPEN_TABLE_FAILED, MYF(0));
goto err;
}
DBUG_PRINT("info", ("check existance of an event with the same name"));
if (!evex_db_find_event_aux(thd, et, table))
{
if (create_if_not)
{
push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_NOTE,
ER_EVENT_ALREADY_EXISTS, ER(ER_EVENT_ALREADY_EXISTS),
et->name.str);
goto ok;
}
my_error(ER_EVENT_ALREADY_EXISTS, MYF(0), et->name.str);
goto err;
}
DBUG_PRINT("info", ("non-existant, go forward"));
if ((ret= sp_use_new_db(thd, et->dbname.str,olddb, sizeof(olddb),0, &dbchanged)))
{
my_error(ER_BAD_DB_ERROR, MYF(0));
goto err;
}
restore_record(table, s->default_values); // Get default values for fields
if (system_charset_info->cset->numchars(system_charset_info, et->dbname.str,
et->dbname.str + et->dbname.length)
> EVEX_DB_FIELD_LEN)
{
my_error(ER_TOO_LONG_IDENT, MYF(0), et->dbname.str);
goto err;
}
if (system_charset_info->cset->numchars(system_charset_info, et->name.str,
et->name.str + et->name.length)
> EVEX_DB_FIELD_LEN)
{
my_error(ER_TOO_LONG_IDENT, MYF(0), et->name.str);
goto err;
}
if (et->body.length > table->field[EVEX_FIELD_BODY]->field_length)
{
my_error(ER_TOO_LONG_BODY, MYF(0), et->name.str);
goto err;
}
if (!(et->expression) && !(et->execute_at.year))
{
DBUG_PRINT("error", ("neither expression nor execute_at are set!"));
my_error(ER_EVENT_NEITHER_M_EXPR_NOR_M_AT, MYF(0));
goto err;
}
if ((ret=table->field[EVEX_FIELD_DEFINER]->store(et->definer.str,
et->definer.length,
system_charset_info)))
{
my_error(ER_EVENT_STORE_FAILED, MYF(0), et->name.str, ret);
goto err;
}
((Field_timestamp *)table->field[EVEX_FIELD_CREATED])->set_time();
/*
evex_fill_row() calls my_error() in case of error so no need to
handle it here
*/
if ((ret= evex_fill_row(thd, table, et, false)))
goto err;
if (table->file->ha_write_row(table->record[0]))
{
my_error(ER_EVENT_STORE_FAILED, MYF(0), et->name.str, ret);
goto err;
}
#ifdef USE_THIS_CODE_AS_TEMPLATE_WHEN_EVENT_REPLICATION_IS_AGREED
if (mysql_bin_log.is_open())
{
thd->clear_error();
/* Such a statement can always go directly to binlog, no trans cache */
thd->binlog_query(THD::MYSQL_QUERY_TYPE,
thd->query, thd->query_length, FALSE, FALSE);
}
#endif
*rows_affected= 1;
ok:
if (dbchanged)
(void) mysql_change_db(thd, olddb, 1);
if (table)
close_thread_tables(thd);
DBUG_RETURN(EVEX_OK);
err:
if (dbchanged)
(void) mysql_change_db(thd, olddb, 1);
if (table)
close_thread_tables(thd);
DBUG_RETURN(EVEX_GENERAL_ERROR);
}
/*
Used to execute ALTER EVENT. Pendant to evex_update_event().
SYNOPSIS
db_update_event()
thd THD
sp_name the name of the event to alter
et event's data
NOTES
sp_name is passed since this is the name of the event to
alter in case of RENAME TO.
*/
static int
db_update_event(THD *thd, Event_timed *et, sp_name *new_name)
{
TABLE *table;
int ret= EVEX_OPEN_TABLE_FAILED;
DBUG_ENTER("db_update_event");
DBUG_PRINT("enter", ("dbname: %.*s", et->dbname.length, et->dbname.str));
DBUG_PRINT("enter", ("name: %.*s", et->name.length, et->name.str));
DBUG_PRINT("enter", ("user: %.*s", et->name.length, et->name.str));
if (new_name)
DBUG_PRINT("enter", ("rename to: %.*s", new_name->m_name.length,
new_name->m_name.str));
if (evex_open_event_table(thd, TL_WRITE, &table))
{
my_error(ER_EVENT_OPEN_TABLE_FAILED, MYF(0));
goto err;
}
/* first look whether we overwrite */
if (new_name)
{
if (!sortcmp_lex_string(et->name, new_name->m_name, system_charset_info) &&
!sortcmp_lex_string(et->dbname, new_name->m_db, system_charset_info))
{
my_error(ER_EVENT_SAME_NAME, MYF(0), et->name.str);
goto err;
}
if (!evex_db_find_event_by_name(thd, new_name->m_db, new_name->m_name,
et->definer, table))
{
my_error(ER_EVENT_ALREADY_EXISTS, MYF(0), new_name->m_name.str);
goto err;
}
}
/*
...and then whether there is such an event. don't exchange the blocks
because you will get error 120 from table handler because new_name will
overwrite the key and SE will tell us that it cannot find the already found
row (copied into record[1] later
*/
if (EVEX_KEY_NOT_FOUND == evex_db_find_event_aux(thd, et, table))
{
my_error(ER_EVENT_DOES_NOT_EXIST, MYF(0), et->name.str);
goto err;
}
store_record(table,record[1]);
/* Don't update create on row update. */
table->timestamp_field_type= TIMESTAMP_NO_AUTO_SET;
/* evex_fill_row() calls my_error() in case of error so no need to handle it here */
if ((ret= evex_fill_row(thd, table, et, true)))
goto err;
if (new_name)
{
table->field[EVEX_FIELD_DB]->
store(new_name->m_db.str, new_name->m_db.length, system_charset_info);
table->field[EVEX_FIELD_NAME]->
store(new_name->m_name.str, new_name->m_name.length, system_charset_info);
}
if ((ret= table->file->ha_update_row(table->record[1], table->record[0])))
{
my_error(ER_EVENT_STORE_FAILED, MYF(0), et->name.str, ret);
goto err;
}
/* close mysql.event or we crash later when loading the event from disk */
close_thread_tables(thd);
DBUG_RETURN(0);
err:
if (table)
close_thread_tables(thd);
DBUG_RETURN(EVEX_GENERAL_ERROR);
}
/*
Looks for a named event in mysql.event and in case of success returns
an object will data loaded from the table.
SYNOPSIS
db_find_event()
thd THD
name the name of the event to find
definer who owns the event
ett event's data if event is found
tbl TABLE object to use when not NULL
NOTES
1) Use sp_name for look up, return in **ett if found
2) tbl is not closed at exit
*/
static int
db_find_event(THD *thd, sp_name *name, LEX_STRING *definer, Event_timed **ett,
TABLE *tbl, MEM_ROOT *root)
{
TABLE *table;
int ret;
Event_timed *et=NULL;
DBUG_ENTER("db_find_event");
DBUG_PRINT("enter", ("name: %*s", name->m_name.length, name->m_name.str));
if (!root)
root= &evex_mem_root;
if (tbl)
table= tbl;
else if (evex_open_event_table(thd, TL_READ, &table))
{
my_error(ER_EVENT_OPEN_TABLE_FAILED, MYF(0));
ret= EVEX_GENERAL_ERROR;
goto done;
}
if ((ret= evex_db_find_event_by_name(thd, name->m_db, name->m_name, *definer,
table)))
{
my_error(ER_EVENT_DOES_NOT_EXIST, MYF(0), name->m_name.str);
goto done;
}
et= new Event_timed;
/*
1)The table should not be closed beforehand. ::load_from_row() only loads
and does not compile
2)::load_from_row() is silent on error therefore we emit error msg here
*/
if ((ret= et->load_from_row(root, table)))
{
my_error(ER_CANNOT_LOAD_FROM_TABLE, MYF(0));
goto done;
}
done:
if (ret && et)
{
delete et;
et= 0;
}
/* don't close the table if we haven't opened it ourselves */
if (!tbl && table)
close_thread_tables(thd);
*ett= et;
DBUG_RETURN(ret);
}
/*
Looks for a named event in mysql.event and then loads it from
the table, compiles it and insert it into the cache.
SYNOPSIS
evex_load_and_compile_event()
thd THD
spn the name of the event to alter
definer who is the owner
use_lock whether to obtain a lock on LOCK_event_arrays or not
RETURN VALUE
0 - OK
< 0 - error (in this case underlying functions call my_error()).
*/
static int
evex_load_and_compile_event(THD * thd, sp_name *spn, LEX_STRING definer,
bool use_lock)
{
int ret= 0;
MEM_ROOT *tmp_mem_root;
Event_timed *ett;
Open_tables_state backup;
DBUG_ENTER("db_load_and_compile_event");
DBUG_PRINT("enter", ("name: %*s", spn->m_name.length, spn->m_name.str));
tmp_mem_root= thd->mem_root;
thd->mem_root= &evex_mem_root;
thd->reset_n_backup_open_tables_state(&backup);
/* no need to use my_error() here because db_find_event() has done it */
ret= db_find_event(thd, spn, &definer, &ett, NULL, NULL);
thd->restore_backup_open_tables_state(&backup);
if (ret)
goto done;
/*
allocate on evex_mem_root. if you call without evex_mem_root
then sphead will not be cleared!
*/
if ((ret= ett->compile(thd, &evex_mem_root)))
goto done;
ett->compute_next_execution_time();
if (use_lock)
VOID(pthread_mutex_lock(&LOCK_event_arrays));
evex_queue_insert(&EVEX_EQ_NAME, (EVEX_PTOQEL) ett);
/*
There is a copy in the array which we don't need. sphead won't be
destroyed.
*/
if (use_lock)
VOID(pthread_mutex_unlock(&LOCK_event_arrays));
done:
if (thd->mem_root != tmp_mem_root)
thd->mem_root= tmp_mem_root;
DBUG_RETURN(ret);
}
/*
Removes from queue in memory the event which is identified by the tupple
(db, name).
SYNOPSIS
evex_remove_from_cache()
db - db name
name - event name
use_lock - whether to lock the mutex LOCK_event_arrays or not in case it
has been already locked outside
is_drop - if an event is currently being executed then we can also delete
the Event_timed instance, so we alarm the event that it should
drop itself if this parameter is set to TRUE. It's false on
ALTER EVENT.
RETURNS
0 OK (always)
*/
static int
evex_remove_from_cache(LEX_STRING *db, LEX_STRING *name, bool use_lock,
bool is_drop)
{
//ToDo : Add definer to the tuple (db, name) to become triple
uint i;
int ret= 0;
DBUG_ENTER("evex_remove_from_cache");
/*
It is possible that 2 (or 1) pass(es) won't find the event in memory.
The reason is that DISABLED events are not cached.
*/
if (use_lock)
VOID(pthread_mutex_lock(&LOCK_event_arrays));
for (i= 0; i < evex_queue_num_elements(EVEX_EQ_NAME); ++i)
{
Event_timed *et= evex_queue_element(&EVEX_EQ_NAME, i, Event_timed*);
DBUG_PRINT("info", ("[%s.%s]==[%s.%s]?",db->str,name->str, et->dbname.str,
et->name.str));
if (!sortcmp_lex_string(*name, et->name, system_charset_info) &&
!sortcmp_lex_string(*db, et->dbname, system_charset_info))
{
if (et->can_spawn_now())
{
DBUG_PRINT("evex_remove_from_cache", ("not running - free and delete"));
et->free_sp();
delete et;
}
else
{
DBUG_PRINT("evex_remove_from_cache",
("running.defer mem free. is_drop=%d", is_drop));
et->flags|= EVENT_EXEC_NO_MORE;
et->dropped= is_drop;
}
DBUG_PRINT("evex_remove_from_cache", ("delete from queue"));
evex_queue_delete_element(&EVEX_EQ_NAME, i);
/* ok, we have cleaned */
ret= 0;
goto done;
}
}
done:
if (use_lock)
VOID(pthread_mutex_unlock(&LOCK_event_arrays));
DBUG_RETURN(ret);
}
/*
The function exported to the world for creating of events.
SYNOPSIS
evex_create_event()
thd THD
et event's data
create_options Options specified when in the query. We are
interested whether there is IF NOT EXISTS
rows_affected How many rows were affected
NOTES
- in case there is an event with the same name (db) and
IF NOT EXISTS is specified, an warning is put into the W stack.
*/
int
evex_create_event(THD *thd, Event_timed *et, uint create_options,
uint *rows_affected)
{
int ret = 0;
DBUG_ENTER("evex_create_event");
DBUG_PRINT("enter", ("name: %*s options:%d", et->name.length,
et->name.str, create_options));
if ((ret = db_create_event(thd, et,
create_options & HA_LEX_CREATE_IF_NOT_EXISTS,
rows_affected)))
goto done;
VOID(pthread_mutex_lock(&LOCK_evex_running));
if (evex_is_running && et->status == MYSQL_EVENT_ENABLED)
{
sp_name spn(et->dbname, et->name);
ret= evex_load_and_compile_event(thd, &spn, et->definer, true);
}
VOID(pthread_mutex_unlock(&LOCK_evex_running));
done:
/* No need to close the table, it will be closed in sql_parse::do_command */
DBUG_RETURN(ret);
}
/*
The function exported to the world for alteration of events.
SYNOPSIS
evex_update_event()
thd THD
et event's data
new_name set in case of RENAME TO.
NOTES
et contains data about dbname and event name.
new_name is the new name of the event, if not null (this means
that RENAME TO was specified in the query)
*/
int
evex_update_event(THD *thd, Event_timed *et, sp_name *new_name,
uint *rows_affected)
{
int ret;
bool need_second_pass= true;
DBUG_ENTER("evex_update_event");
DBUG_PRINT("enter", ("name: %*s", et->name.length, et->name.str));
/*
db_update_event() opens & closes the table to prevent
crash later in the code when loading and compiling the new definition.
Also on error conditions my_error() is called so no need to handle here
*/
if ((ret= db_update_event(thd, et, new_name)))
goto done;
VOID(pthread_mutex_lock(&LOCK_evex_running));
if (!evex_is_running)
UNLOCK_MUTEX_AND_BAIL_OUT(LOCK_evex_running, done);
VOID(pthread_mutex_lock(&LOCK_event_arrays));
evex_remove_from_cache(&et->dbname, &et->name, false, false);
if (et->status == MYSQL_EVENT_ENABLED)
{
if (new_name)
ret= evex_load_and_compile_event(thd, new_name, et->definer, false);
else
{
sp_name spn(et->dbname, et->name);
ret= evex_load_and_compile_event(thd, &spn, et->definer, false);
}
if (ret == EVEX_COMPILE_ERROR)
my_error(ER_EVENT_COMPILE_ERROR, MYF(0));
}
VOID(pthread_mutex_unlock(&LOCK_event_arrays));
VOID(pthread_mutex_unlock(&LOCK_evex_running));
done:
DBUG_RETURN(ret);
}
/*
Drops an event
SYNOPSIS
db_drop_event()
thd THD
et event's name
drop_if_exists if set and the event not existing => warning onto the stack
rows_affected affected number of rows is returned heres
*/
int db_drop_event(THD *thd, Event_timed *et, bool drop_if_exists,
uint *rows_affected)
{
TABLE *table;
Open_tables_state backup;
int ret;
DBUG_ENTER("db_drop_event");
ret= EVEX_OPEN_TABLE_FAILED;
thd->reset_n_backup_open_tables_state(&backup);
if (evex_open_event_table(thd, TL_WRITE, &table))
{
my_error(ER_EVENT_OPEN_TABLE_FAILED, MYF(0));
goto done;
}
if (!(ret= evex_db_find_event_aux(thd, et, table)))
{
if ((ret= table->file->ha_delete_row(table->record[0])))
{
my_error(ER_EVENT_CANNOT_DELETE, MYF(0));
goto done;
}
}
else if (ret == EVEX_KEY_NOT_FOUND)
{
if (drop_if_exists)
{
push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_NOTE,
ER_SP_DOES_NOT_EXIST, ER(ER_SP_DOES_NOT_EXIST),
"Event", et->name.str);
ret= 0;
} else
my_error(ER_EVENT_DOES_NOT_EXIST, MYF(0), et->name.str);
goto done;
}
done:
/*
evex_drop_event() is used by Event_timed::drop therefore
we have to close our thread tables.
*/
close_thread_tables(thd);
thd->restore_backup_open_tables_state(&backup);
DBUG_RETURN(ret);
}
/*
Drops an event
SYNOPSIS
evex_drop_event()
thd THD
et event's name
drop_if_exists if set and the event not existing => warning onto the stack
rows_affected affected number of rows is returned heres
*/
int
evex_drop_event(THD *thd, Event_timed *et, bool drop_if_exists,
uint *rows_affected)
{
int ret= 0;
DBUG_ENTER("evex_drop_event");
VOID(pthread_mutex_lock(&LOCK_evex_running));
if (evex_is_running)
ret= evex_remove_from_cache(&et->dbname, &et->name, true, true);
VOID(pthread_mutex_unlock(&LOCK_evex_running));
if (ret == 1)
ret= 0;
else if (ret == 0)
ret= db_drop_event(thd, et, drop_if_exists, rows_affected);
else
my_error(ER_UNKNOWN_ERROR, MYF(0));
DBUG_RETURN(ret);
}
/*
SHOW CREATE EVENT
SYNOPSIS
evex_show_create_event()
thd THD
spn the name of the event (db, name)
definer the definer of the event
RETURNS
0 - OK
1 - Error during writing to the wire
*/
int
evex_show_create_event(THD *thd, sp_name *spn, LEX_STRING definer)
{
int ret;
Event_timed *et= NULL;
Open_tables_state backup;
DBUG_ENTER("evex_update_event");
DBUG_PRINT("enter", ("name: %*s", spn->m_name.length, spn->m_name.str));
thd->reset_n_backup_open_tables_state(&backup);
ret= db_find_event(thd, spn, &definer, &et, NULL, thd->mem_root);
thd->restore_backup_open_tables_state(&backup);
if (!ret && et)
{
Protocol *protocol= thd->protocol;
char show_str_buf[768];
String show_str(show_str_buf, sizeof(show_str_buf), system_charset_info);
List<Item> field_list;
byte *sql_mode_str;
ulong sql_mode_len=0;
show_str.length(0);
show_str.set_charset(system_charset_info);
if (et->get_create_event(thd, &show_str))
DBUG_RETURN(1);
field_list.push_back(new Item_empty_string("Event", NAME_LEN));
sql_mode_str=
sys_var_thd_sql_mode::symbolic_mode_representation(thd, et->sql_mode,
&sql_mode_len);
field_list.push_back(new Item_empty_string("sql_mode", sql_mode_len));
field_list.push_back(new Item_empty_string("Create Event",
show_str.length()));
if (protocol->send_fields(&field_list, Protocol::SEND_NUM_ROWS |
Protocol::SEND_EOF))
DBUG_RETURN(1);
protocol->prepare_for_resend();
protocol->store(et->name.str, et->name.length, system_charset_info);
protocol->store((char*) sql_mode_str, sql_mode_len, system_charset_info);
protocol->store(show_str.c_ptr(), show_str.length(), system_charset_info);
ret= protocol->write();
send_eof(thd);
}
DBUG_RETURN(ret);
}
/*
evex_drop_db_events - Drops all events in the selected database
thd - Thread
db - ASCIIZ the name of the database
Returns:
0 - OK
1 - Failed to delete a specific row
2 - Got NULL while reading db name from a row
Note:
The algo is the following
1. Go through the in-memory cache, if the scheduler is working
and for every event whose dbname matches the database we drop
check whether is currently in execution:
- Event_timed::can_spawn() returns true -> the event is not
being executed in a child thread. The reason not to use
Event_timed::is_running() is that the latter shows only if
it is being executed, which is 99% of the time in the thread
but there are some initiliazations before and after the
anonymous SP is being called. So if we delete in this moment
-=> *boom*, so we have to check whether the thread has been
spawned and can_spawn() is the right method.
- Event_timed::can_spawn() returns false -> being runned ATM
just set the flags so it should drop itself.
*/
int
evex_drop_db_events(THD *thd, char *db)
{
TABLE *table;
READ_RECORD read_record_info;
int ret= 0;
uint i;
LEX_STRING db_lex= {db, strlen(db)};
DBUG_ENTER("evex_drop_db_events");
DBUG_PRINT("info",("dropping events from %s", db));
VOID(pthread_mutex_lock(&LOCK_event_arrays));
if ((ret= evex_open_event_table(thd, TL_WRITE, &table)))
{
sql_print_error("Table mysql.event is damaged.");
VOID(pthread_mutex_unlock(&LOCK_event_arrays));
DBUG_RETURN(SP_OPEN_TABLE_FAILED);
}
DBUG_PRINT("info",("%d elements in the queue",
evex_queue_num_elements(EVEX_EQ_NAME)));
VOID(pthread_mutex_lock(&LOCK_evex_running));
if (!evex_is_running)
goto skip_memory;
for (i= 0; i < evex_queue_num_elements(EVEX_EQ_NAME); ++i)
{
Event_timed *et= evex_queue_element(&EVEX_EQ_NAME, i, Event_timed*);
if (sortcmp_lex_string(et->dbname, db_lex, system_charset_info))
continue;
if (et->can_spawn_now_n_lock(thd))
{
DBUG_PRINT("info",("event %s not running - direct delete", et->name.str));
if (!(ret= evex_db_find_event_aux(thd, et, table)))
{
DBUG_PRINT("info",("event %s found on disk", et->name.str));
if ((ret= table->file->ha_delete_row(table->record[0])))
{
sql_print_error("Error while deleting a row - dropping "
"a database. Skipping the rest.");
my_error(ER_EVENT_DROP_FAILED, MYF(0), et->name.str);
goto end;
}
DBUG_PRINT("info",("deleted event [%s] num [%d]. Time to free mem",
et->name.str, i));
}
else if (ret == EVEX_KEY_NOT_FOUND)
{
sql_print_error("Expected to find event %s.%s of %s on disk-not there.",
et->dbname.str, et->name.str, et->definer.str);
}
et->free_sp();
delete et;
et= 0;
/* no need to call et->spawn_unlock because we already cleaned et */
}
else
{
DBUG_PRINT("info",("event %s is running. setting exec_no_more and dropped",
et->name.str));
et->flags|= EVENT_EXEC_NO_MORE;
et->dropped= TRUE;
}
DBUG_PRINT("info",("%d elements in the queue",
evex_queue_num_elements(EVEX_EQ_NAME)));
evex_queue_delete_element(&EVEX_EQ_NAME, i);// 0 is top
DBUG_PRINT("info",("%d elements in the queue",
evex_queue_num_elements(EVEX_EQ_NAME)));
/*
decrease so we start at the same position, there will be
less elements in the queue, it will still be ordered so on
next iteration it will be again i the current element or if
no more we finish.
*/
--i;
}
skip_memory:
/*
The reasoning behind having two loops is the following:
If there was only one loop, the table-scan, then for every element which
matches, the queue in memory has to be searched to remove the element.
While if we go first over the queue and remove what's in there we have only
one pass over it and after finishing it, moving to table-scan for the disabled
events. This needs quite less time and means quite less locking on
LOCK_event_arrays.
*/
DBUG_PRINT("info",("Mem-cache checked, now going to db for disabled events"));
/* only enabled events are in memory, so we go now and delete the rest */
init_read_record(&read_record_info, thd, table ,NULL,1,0);
while (!(read_record_info.read_record(&read_record_info)) && !ret)
{
char *et_db;
if ((et_db= get_field(thd->mem_root, table->field[EVEX_FIELD_DB])) == NULL)
{
ret= 2;
break;
}
LEX_STRING et_db_lex= {et_db, strlen(et_db)};
if (!sortcmp_lex_string(et_db_lex, db_lex, system_charset_info))
{
Event_timed ett;
char *ptr;
if ((ptr= get_field(thd->mem_root, table->field[EVEX_FIELD_STATUS]))
== NullS)
{
sql_print_error("Error while loading from mysql.event. "
"Table probably corrupted");
goto end;
}
/*
When not running nothing is in memory so we have to clean
everything.
We don't delete EVENT_ENABLED events when the scheduler is running
because maybe this is an event which we asked to drop itself when
it is finished and it hasn't finished yet, so we don't touch it.
It will drop itself. The not running ENABLED events has been already
deleted from ha_delete_row() above in the loop over the QUEUE
(in case the executor is running).
'D' stands for DISABLED, 'E' for ENABLED - it's an enum
*/
if ((evex_is_running && ptr[0] == 'D') || !evex_is_running)
{
DBUG_PRINT("info", ("Dropping %s.%s", et_db, ett.name.str));
if ((ret= table->file->ha_delete_row(table->record[0])))
{
my_error(ER_EVENT_DROP_FAILED, MYF(0), ett.name.str);
goto end;
}
}
}
}
DBUG_PRINT("info",("Disk checked for disabled events. Finishing."));
end:
VOID(pthread_mutex_unlock(&LOCK_evex_running));
VOID(pthread_mutex_unlock(&LOCK_event_arrays));
end_read_record(&read_record_info);
thd->version--; /* Force close to free memory */
close_thread_tables(thd);
DBUG_RETURN(ret);
}
Reference in a new issue View git blame Copy permalink