drop database if exists events_test;
create database events_test;
use events_test;
create event e_26 on schedule at '2037-01-01 00:00:00' disable do set @a = 5;
select db, name, body, definer, convert_tz(execute_at, 'UTC', 'SYSTEM'), on_completion from mysql.event;
db	name	body	definer	convert_tz(execute_at, 'UTC', 'SYSTEM')	on_completion
events_test	e_26	set @a = 5	root@localhost	2037-01-01 00:00:00	DROP
drop event e_26;
create event e_26 on schedule at NULL disable do set @a = 5;
ERROR HY000: Incorrect AT value: 'NULL'
create event e_26 on schedule at 'definitely not a datetime' disable do set @a = 5;
ERROR HY000: Incorrect AT value: 'definitely not a datetime'
set names utf8;
create event задачка on schedule every 123 minute starts now() ends now() + interval 1 month do select 1;
drop event задачка;
"DISABLE the scheduler. Testing that it does not work when the variable is 0"
set global event_scheduler=off;
select definer, name, db from mysql.event;
definer	name	db
select get_lock("test_lock1", 20);
get_lock("test_lock1", 20)
1
create event закачка on schedule every 10 hour do select get_lock("test_lock1", 20);
"Should return 1 row"
select definer, name, db from mysql.event;
definer	name	db
root@localhost	закачка	events_test
"Should be only 0 process"
select /*1*/ user, host, db, command, state, info
from information_schema.processlist
where (user='event_scheduler')
order by info;
user	host	db	command	state	info
select release_lock("test_lock1");
release_lock("test_lock1")
1
drop event закачка;
"Should have 0 events"
select count(*) from mysql.event;
count(*)
0
"ENABLE the scheduler and get a lock"
set global event_scheduler=on;
select get_lock("test_lock2", 20);
get_lock("test_lock2", 20)
1
"Create an event which tries to acquire a mutex. The event locks on the mutex"
create event закачка on schedule every 10 hour do select get_lock("test_lock2", 20);
"Should have only 2 processes: the scheduler and the locked event"
select /*2*/ user, host, db, command, state, info
from information_schema.processlist
where (info like "select get_lock%" OR user='event_scheduler')
order by info;
user	host	db	command	state	info
event_scheduler	localhost	NULL	Daemon	Waiting for next activation	NULL
root	localhost	events_test	Connect	User lock	select get_lock("test_lock2", 20)
"Release the mutex, the event worker should finish."
select release_lock("test_lock2");
release_lock("test_lock2")
1
drop event закачка;
set global event_scheduler=1;
select get_lock("test_lock2_1", 20);
get_lock("test_lock2_1", 20)
1
create event закачка21 on schedule every 10 hour do select get_lock("test_lock2_1", 20);
"Should have only 2 processes: the scheduler and the locked event"
select /*3*/ user, host, db, command, state, info
from information_schema.processlist
where (info like "select get_lock%" OR user='event_scheduler')
order by info;
user	host	db	command	state	info
event_scheduler	localhost	NULL	Daemon	Waiting for next activation	NULL
root	localhost	events_test	Connect	User lock	select get_lock("test_lock2_1", 20)
set global event_scheduler=off;
"Should have only our process now:"
select /*4*/ user, host, db, command, state, info
from information_schema.processlist
where (info like "select get_lock%" OR user='event_scheduler')
order by info;
user	host	db	command	state	info
root	localhost	events_test	Connect	User lock	select get_lock("test_lock2_1", 20)
select release_lock("test_lock2_1");
release_lock("test_lock2_1")
1
drop event закачка21;
create table t_16 (s1 int);
create trigger t_16_bi before insert on t_16 for each row create event  e_16 on schedule every 1 second do set @a=5;
ERROR HY000: Recursion of EVENT DDL statements is forbidden when body is present
drop table t_16;
create event white_space
on schedule every 10 hour
disable
do
select 1;
select event_schema, event_name, definer, event_definition from information_schema.events where event_name='white_space';
event_schema	event_name	definer	event_definition
events_test	white_space	root@localhost	select 1
drop event white_space;
create event white_space on schedule every 10 hour disable do
select 2;
select event_schema, event_name, definer, event_definition from information_schema.events where event_name='white_space';
event_schema	event_name	definer	event_definition
events_test	white_space	root@localhost	select 2
drop event white_space;
create event white_space on schedule every 10 hour disable do	select 3;
select event_schema, event_name, definer, event_definition from information_schema.events where event_name='white_space';
event_schema	event_name	definer	event_definition
events_test	white_space	root@localhost	select 3
drop event white_space;
create event e1 on schedule every 1 year do set @a = 5;
create table t1 (s1 int);
create trigger t1_ai after insert on t1 for each row show create event e1;
ERROR 0A000: Not allowed to return a result set from a trigger
drop table t1;
drop event e1;
SHOW EVENTS FROM aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa;
ERROR 42000: Incorrect database name 'aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa'
SHOW EVENTS FROM ``;
ERROR 42000: Incorrect database name ''
SHOW EVENTS FROM `events\\test`;
Db	Name	Definer	Time zone	Type	Execute at	Interval value	Interval field	Starts	Ends	Status	Originator	character_set_client	collation_connection	Database Collation

LOCK TABLES mode.

create table t1 (a int);
create event e1 on schedule every 10 hour do select 1;
lock table t1 read;
show create event e1;
Event	sql_mode	time_zone	Create Event	character_set_client	collation_connection	Database Collation
e1		SYSTEM	CREATE DEFINER=`root`@`localhost` EVENT `e1` ON SCHEDULE EVERY 10 HOUR STARTS '#' ON COMPLETION NOT PRESERVE ENABLE DO select 1	utf8	utf8_general_ci	latin1_swedish_ci
select event_name from information_schema.events;
event_name
e1
create event e2 on schedule every 10 hour do select 1;
ERROR HY000: Can't execute the given command because you have active locked tables or an active transaction
alter event e2 disable;
ERROR HY000: Can't execute the given command because you have active locked tables or an active transaction
alter event e2 rename to e3;
ERROR HY000: Can't execute the given command because you have active locked tables or an active transaction
drop event e2;
ERROR HY000: Can't execute the given command because you have active locked tables or an active transaction
drop event e1;
ERROR HY000: Can't execute the given command because you have active locked tables or an active transaction
unlock tables;
lock table t1 write;
show create event e1;
Event	sql_mode	time_zone	Create Event	character_set_client	collation_connection	Database Collation
e1		SYSTEM	CREATE DEFINER=`root`@`localhost` EVENT `e1` ON SCHEDULE EVERY 10 HOUR STARTS '#' ON COMPLETION NOT PRESERVE ENABLE DO select 1	utf8	utf8_general_ci	latin1_swedish_ci
select event_name from information_schema.events;
event_name
e1
create event e2 on schedule every 10 hour do select 1;
ERROR HY000: Can't execute the given command because you have active locked tables or an active transaction
alter event e2 disable;
ERROR HY000: Can't execute the given command because you have active locked tables or an active transaction
alter event e2 rename to e3;
ERROR HY000: Can't execute the given command because you have active locked tables or an active transaction
drop event e2;
ERROR HY000: Can't execute the given command because you have active locked tables or an active transaction
drop event e1;
ERROR HY000: Can't execute the given command because you have active locked tables or an active transaction
unlock tables;
lock table t1 read, mysql.event read;
show create event e1;
Event	sql_mode	time_zone	Create Event	character_set_client	collation_connection	Database Collation
e1		SYSTEM	CREATE DEFINER=`root`@`localhost` EVENT `e1` ON SCHEDULE EVERY 10 HOUR STARTS '#' ON COMPLETION NOT PRESERVE ENABLE DO select 1	utf8	utf8_general_ci	latin1_swedish_ci
select event_name from information_schema.events;
event_name
e1
create event e2 on schedule every 10 hour do select 1;
ERROR HY000: Can't execute the given command because you have active locked tables or an active transaction
alter event e2 disable;
ERROR HY000: Can't execute the given command because you have active locked tables or an active transaction
alter event e2 rename to e3;
ERROR HY000: Can't execute the given command because you have active locked tables or an active transaction
drop event e2;
ERROR HY000: Can't execute the given command because you have active locked tables or an active transaction
drop event e1;
ERROR HY000: Can't execute the given command because you have active locked tables or an active transaction
unlock tables;
lock table t1 write, mysql.event read;
show create event e1;
Event	sql_mode	time_zone	Create Event	character_set_client	collation_connection	Database Collation
e1		SYSTEM	CREATE DEFINER=`root`@`localhost` EVENT `e1` ON SCHEDULE EVERY 10 HOUR STARTS '#' ON COMPLETION NOT PRESERVE ENABLE DO select 1	utf8	utf8_general_ci	latin1_swedish_ci
select event_name from information_schema.events;
event_name
e1
create event e2 on schedule every 10 hour do select 1;
ERROR HY000: Can't execute the given command because you have active locked tables or an active transaction
alter event e2 disable;
ERROR HY000: Can't execute the given command because you have active locked tables or an active transaction
alter event e2 rename to e3;
ERROR HY000: Can't execute the given command because you have active locked tables or an active transaction
drop event e2;
ERROR HY000: Can't execute the given command because you have active locked tables or an active transaction
drop event e1;
ERROR HY000: Can't execute the given command because you have active locked tables or an active transaction
unlock tables;
lock table t1 read, mysql.event write;
ERROR HY000: You can't combine write-locking of system tables with other tables or lock types
lock table t1 write, mysql.event write;
ERROR HY000: You can't combine write-locking of system tables with other tables or lock types
lock table mysql.event write;
show create event e1;
Event	sql_mode	time_zone	Create Event	character_set_client	collation_connection	Database Collation
e1		SYSTEM	CREATE DEFINER=`root`@`localhost` EVENT `e1` ON SCHEDULE EVERY 10 HOUR STARTS '#' ON COMPLETION NOT PRESERVE ENABLE DO select 1	utf8	utf8_general_ci	latin1_swedish_ci
select event_name from information_schema.events;
event_name
e1
create event e2 on schedule every 10 hour do select 1;
ERROR HY000: Can't execute the given command because you have active locked tables or an active transaction
alter event e2 disable;
ERROR HY000: Can't execute the given command because you have active locked tables or an active transaction
alter event e2 rename to e3;
ERROR HY000: Can't execute the given command because you have active locked tables or an active transaction
drop event e3;
ERROR HY000: Can't execute the given command because you have active locked tables or an active transaction
drop event e1;
ERROR HY000: Can't execute the given command because you have active locked tables or an active transaction
unlock tables;
drop event e1;
Make sure we have left no events 
select event_name from information_schema.events;
event_name

Events in sub-statements, events and prelocking


create event e1 on schedule every 10 hour do select 1;
create function f1() returns int
begin
show create event e1;
return 1;
end|
ERROR 0A000: Not allowed to return a result set from a function
create trigger trg before insert on t1 for each row
begin
show create event e1;
end|
ERROR 0A000: Not allowed to return a result set from a trigger
create function f1() returns int
begin
select event_name from information_schema.events;
return 1;
end|
ERROR 0A000: Not allowed to return a result set from a function
create trigger trg before insert on t1 for each row
begin
select event_name from information_schema.events;
end|
ERROR 0A000: Not allowed to return a result set from a trigger
create function f1() returns int
begin
create event e2 on schedule every 10 hour do select 1;
return 1;
end|
ERROR HY000: Recursion of EVENT DDL statements is forbidden when body is present
create function f1() returns int
begin
alter event e1 rename to e2;
return 1;
end|
ERROR HY000: Explicit or implicit commit is not allowed in stored function or trigger.
create function f1() returns int
begin
drop event e2;
return 1;
end|
ERROR HY000: Explicit or implicit commit is not allowed in stored function or trigger.
----------------------------------------------------------------------
create trigger trg before insert on t1 for each row
begin
set new.a= f1();
end|
create function f1() returns int
begin
call p1();
return 0;
end|
create procedure p1()
begin
select event_name from information_schema.events;
end|
insert into t1 (a) values (1)|
ERROR 0A000: Not allowed to return a result set from a trigger
drop procedure p1|
create procedure p1()
begin
show create event e1; 
end|
insert into t1 (a) values (1)|
ERROR 0A000: Not allowed to return a result set from a trigger
drop procedure p1|
create procedure p1()
begin
create temporary table tmp select event_name from information_schema.events;
end|
expected to work, since we redirect the output into a tmp table
insert into t1 (a) values (1)|
select * from tmp|
event_name
e1
drop temporary table tmp|
drop procedure p1|
create procedure p1()
begin
alter event e1 rename to e2;
end|
insert into t1 (a) values (1)|
ERROR HY000: Explicit or implicit commit is not allowed in stored function or trigger.
drop procedure p1|
create procedure p1()
begin
drop event e1;
end|
insert into t1 (a) values (1)|
ERROR HY000: Explicit or implicit commit is not allowed in stored function or trigger.
drop table t1|
drop event e1|
set names utf8;
create event имя_события_в_кодировке_утф8_длиной_больше_чем_48 on schedule every 2 year do select 1;
select EVENT_NAME from information_schema.events
where event_schema='test';
EVENT_NAME
drop event имя_события_в_кодировке_утф8_длиной_больше_чем_48;
create event
очень_очень_очень_очень_очень_очень_очень_очень_длинная_строка_66
on schedule every 2 year do select 1;
ERROR 42000: Identifier name 'очень_очень_очень_очень_очень_очень_очень_очень_длинна' is too long
create event event_35981 on schedule every 6 month on completion preserve
disable
do
select 1;
The following SELECTs should all give 1
select  count(*) from information_schema.events
where   event_schema = database() and event_name = 'event_35981' and
on_completion = 'PRESERVE';
count(*)
1
alter   event event_35981 enable;
select  count(*) from information_schema.events
where   event_schema = database() and event_name = 'event_35981' and
on_completion = 'PRESERVE';
count(*)
1
alter   event event_35981 on completion not preserve;
select  count(*) from information_schema.events
where   event_schema = database() and event_name = 'event_35981' and
on_completion = 'NOT PRESERVE';
count(*)
1
alter   event event_35981 disable;
select  count(*) from information_schema.events
where   event_schema = database() and event_name = 'event_35981' and
on_completion = 'NOT PRESERVE';
count(*)
1
alter   event event_35981 on completion preserve;
select  count(*) from information_schema.events
where   event_schema = database() and event_name = 'event_35981' and
on_completion = 'PRESERVE';
count(*)
1
drop event event_35981;
create event event_35981 on schedule every 6 month disable
do
select 1;
select  count(*) from information_schema.events
where   event_schema = database() and event_name = 'event_35981' and
on_completion = 'NOT PRESERVE';
count(*)
1
drop event event_35981;
create event event_35981 on schedule every 1 hour starts current_timestamp
on completion not preserve
do
select 1;
alter event event_35981 on schedule every 1 hour starts '1999-01-01 00:00:00'
  ends '1999-01-02 00:00:00';
ERROR HY000: Event execution time is in the past and ON COMPLETION NOT PRESERVE is set. The event was dropped immediately after creation.
drop event event_35981;
create event event_35981 on schedule every 1 hour starts current_timestamp
on completion not preserve
do
select 1;
alter event event_35981 on schedule every 1 hour starts '1999-01-01 00:00:00'
  ends '1999-01-02 00:00:00' on completion preserve;
Warnings:
Note	1544	Event execution time is in the past. Event has been disabled
drop event event_35981;
create event event_35981 on schedule every 1 hour starts current_timestamp
on completion preserve
do
select 1;
alter event event_35981 on schedule every 1 hour starts '1999-01-01 00:00:00'
  ends '1999-01-02 00:00:00';
Warnings:
Note	1544	Event execution time is in the past. Event has been disabled
alter event event_35981 on schedule every 1 hour starts '1999-01-01 00:00:00'
  ends '1999-01-02 00:00:00' on completion not preserve;
ERROR HY000: Event execution time is in the past and ON COMPLETION NOT PRESERVE is set. The event was dropped immediately after creation.
alter event event_35981 on schedule every 1 hour starts '1999-01-01 00:00:00'
  ends '1999-01-02 00:00:00' on completion preserve;
Warnings:
Note	1544	Event execution time is in the past. Event has been disabled
drop event event_35981;
drop database events_test;