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mariadb/sql/event.cc
andrey@lmy004. 9d7d8767dd post-commit merge
2006-01-30 14:28:48 +01:00

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/* 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 function documentation whenever needed.
- 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;
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.");
}
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);
}
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;
}
int
event_timed_compare(event_timed *a, event_timed *b)
{
return my_time_compare(&a->execute_at, &b->execute_at);
}
/*
Callback for the prio queue
*/
int
event_timed_compare_q(void *vptr, byte* a, byte *b)
{
return event_timed_compare((event_timed *)a, (event_timed *)b);
}
/*
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;
bool not_used;
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 (tables.table->s->fields != EVEX_FIELD_COUNT)
{
my_error(ER_EVENT_COL_COUNT_DOESNT_MATCH, MYF(0), "mysql", "event");
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
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_aux(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_aux");
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");
if (table->s->fields != EVEX_FIELD_COUNT)
{
my_error(ER_EVENT_COL_COUNT_DOESNT_MATCH, MYF(0), "mysql", "event");
DBUG_RETURN(EVEX_GET_FIELD_FAILED);
}
DBUG_PRINT("info", ("dbname.len=[%s]",et->dbname.str));
DBUG_PRINT("info", ("name.len=[%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);
table->field[EVEX_FIELD_STATUS]->store((longlong)et->status);
if (et->body.str)
if (table->field[field_num= EVEX_FIELD_BODY]->
store(et->body.str, et->body.length, system_charset_info))
goto trunc_err;
if (et->starts.year)
{
table->field[EVEX_FIELD_STARTS]->set_notnull();// set NULL flag to OFF
table->field[EVEX_FIELD_STARTS]->
store_time(&et->starts, MYSQL_TIMESTAMP_DATETIME);
}
if (et->ends.year)
{
table->field[EVEX_FIELD_ENDS]->set_notnull();
table->field[EVEX_FIELD_ENDS]->
store_time(&et->ends, MYSQL_TIMESTAMP_DATETIME);
}
if (et->expression)
{
table->field[EVEX_FIELD_INTERVAL_EXPR]->set_notnull();
table->field[EVEX_FIELD_INTERVAL_EXPR]->store((longlong)et->expression);
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);
table->field[EVEX_FIELD_EXECUTE_AT]->set_null();
}
else if (et->execute_at.year)
{
// fix_fields already called in init_execute_at
table->field[EVEX_FIELD_INTERVAL_EXPR]->set_null();
table->field[EVEX_FIELD_TRANSIENT_INTERVAL]->set_null();
table->field[EVEX_FIELD_EXECUTE_AT]->set_notnull();
table->field[EVEX_FIELD_EXECUTE_AT]->store_time(&et->execute_at,
MYSQL_TIMESTAMP_DATETIME);
table->field[EVEX_FIELD_TRANSIENT_INTERVAL]->set_null();
}
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.length)
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));
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 definer[HOSTNAME_LENGTH+USERNAME_LENGTH+2];
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->dbname, et->name, et->definer, 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;
}
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);
}
*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_aux(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->dbname, et->name,
et->definer, 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)
{
TABLE *table;
int ret;
char *ptr;
event_timed *et;
DBUG_ENTER("db_find_event");
DBUG_PRINT("enter", ("name: %*s", name->m_name.length, name->m_name.str));
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_aux(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(&evex_mem_root, table)))
{
my_error(ER_EVENT_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
if ((ret= db_find_event(thd, spn, definer, &ett, NULL)))
goto done;
thd->restore_backup_open_tables_state(&backup);
/*
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);
}
static int
evex_remove_from_cache(LEX_STRING *db, LEX_STRING *name, bool use_lock,
bool is_drop)
{
uint i;
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->is_running())
{
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
goto done;
}
}
done:
if (use_lock)
VOID(pthread_mutex_unlock(&LOCK_event_arrays));
DBUG_RETURN(0);
}
/*
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.
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, i;
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
evex_drop_event()
thd THD
et event's name
drop_if_exists if set and the event not existing => warning onto the stack
*/
int
evex_drop_event(THD *thd, event_timed *et, bool drop_if_exists,
uint *rows_affected)
{
TABLE *table;
int ret= EVEX_OPEN_TABLE_FAILED;
DBUG_ENTER("evex_drop_event");
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->dbname,et->name,et->definer,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;
}
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));
done:
/*
evex_drop_event() is used by event_timed::drop therefore
we have to close our thread tables.
*/
close_thread_tables(thd);
DBUG_RETURN(ret);
}
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