drop database if exists events_test; drop database if exists db_x; drop database if exists mysqltest_db2; drop database if exists mysqltest_no_such_database; create database events_test; use events_test; CREATE USER pauline@localhost; CREATE DATABASE db_x; GRANT EVENT ON db_x.* TO pauline@localhost; USE db_x; CREATE TABLE x_table(a int); CREATE EVENT e_x1 ON SCHEDULE EVERY 1 SECOND DO DROP DATABASE db_x; CREATE EVENT e_x2 ON SCHEDULE EVERY 1 SECOND DO DROP TABLE x_table; SHOW DATABASES LIKE 'db_x'; Database (db_x) db_x SET GLOBAL event_scheduler=1; SHOW DATABASES LIKE 'db_x'; Database (db_x) db_x SHOW TABLES FROM db_x; Tables_in_db_x x_table SET GLOBAL event_scheduler=off; DROP EVENT e_x1; DROP EVENT e_x2; DROP DATABASE db_x; DROP USER pauline@localhost; USE events_test; SET GLOBAL event_scheduler=off; drop event if exists event1; Warnings: Note 1305 Event event1 does not exist create event event1 on schedule every 15 minute starts now() ends date_add(now(), interval 5 hour) DO begin end; alter event event1 rename to event2 enable; alter event event2 disable; alter event event2 enable; alter event event2 on completion not preserve; alter event event2 on schedule every 1 year on completion preserve rename to event3 comment "new comment" do begin select 1; end__ alter event event3 rename to event2; drop event event2; create event event2 on schedule every 2 second starts now() ends date_add(now(), interval 5 hour) comment "some" DO begin end; drop event event2; CREATE EVENT event_starts_test ON SCHEDULE EVERY 10 SECOND COMMENT "" DO SELECT 1; SELECT interval_field, interval_value, body FROM mysql.event WHERE db='events_test' AND name='event_starts_test'; interval_field interval_value body SECOND 10 SELECT 1 SELECT execute_at IS NULL, starts IS NULL, ends IS NULL, comment FROM mysql.event WHERE db='events_test' AND name='event_starts_test'; execute_at IS NULL starts IS NULL ends IS NULL comment 1 0 1 ALTER EVENT event_starts_test ON SCHEDULE AT '2020-02-02 20:00:02'; SELECT execute_at IS NULL, starts IS NULL, ends IS NULL, comment FROM mysql.event WHERE db='events_test' AND name='event_starts_test'; execute_at IS NULL starts IS NULL ends IS NULL comment 0 1 1 ALTER EVENT event_starts_test COMMENT "non-empty comment"; SELECT execute_at IS NULL, starts IS NULL, ends IS NULL, comment FROM mysql.event WHERE db='events_test' AND name='event_starts_test'; execute_at IS NULL starts IS NULL ends IS NULL comment 0 1 1 non-empty comment ALTER EVENT event_starts_test COMMENT ""; SELECT execute_at IS NULL, starts IS NULL, ends IS NULL, comment FROM mysql.event WHERE db='events_test' AND name='event_starts_test'; execute_at IS NULL starts IS NULL ends IS NULL comment 0 1 1 DROP EVENT event_starts_test; CREATE EVENT event_starts_test ON SCHEDULE EVERY 20 SECOND STARTS '2020-02-02 20:00:02' ENDS '2022-02-02 20:00:02' DO SELECT 2; SELECT execute_at IS NULL, starts IS NULL, ends IS NULL, comment FROM mysql.event WHERE db='events_test' AND name='event_starts_test'; execute_at IS NULL starts IS NULL ends IS NULL comment 1 0 0 ALTER EVENT event_starts_test COMMENT "non-empty comment"; SELECT execute_at IS NULL, starts IS NULL, ends IS NULL, comment FROM mysql.event WHERE db='events_test' AND name='event_starts_test'; execute_at IS NULL starts IS NULL ends IS NULL comment 1 0 0 non-empty comment ALTER EVENT event_starts_test COMMENT ""; SELECT execute_at IS NULL, starts IS NULL, ends IS NULL, comment FROM mysql.event WHERE db='events_test' AND name='event_starts_test'; execute_at IS NULL starts IS NULL ends IS NULL comment 1 0 0 DROP EVENT event_starts_test; create table test_nested(a int); create event e_43 on schedule every 1 second do set @a = 5; alter event e_43 do alter event e_43 do set @a = 4; ERROR HY000: Recursion of EVENT DDL statements is forbidden when body is present alter event e_43 do begin alter event e_43 on schedule every 5 minute; insert into test_nested values(1); end| set global event_scheduler = on; select db, name, body, status, interval_field, interval_value from mysql.event; db name body status interval_field interval_value events_test e_43 begin alter event e_43 on schedule every 5 minute; insert into test_nested values(1); end ENABLED MINUTE 5 drop event e_43; drop table test_nested; "Let's check whether we can use non-qualified names" create table non_qualif(a int); create event non_qualif_ev on schedule every 10 minute do insert into non_qualif values (800219); select * from non_qualif; a 800219 drop event non_qualif_ev; drop table non_qualif; alter event non_existant rename to non_existant_too; ERROR HY000: Unknown event 'non_existant' set global event_scheduler = off; create event existant on schedule at now() + interval 1 year do select 12; alter event non_existant rename to existant; ERROR HY000: Event 'existant' already exists alter event existant rename to events_test.existant; ERROR HY000: Same old and new event name drop event existant; create table t_event3 (a int, b float); drop event if exists event3; Warnings: Note 1305 Event event3 does not exist create event event3 on schedule every 50 + 10 minute starts date_add("20100101", interval 5 minute) ends date_add("20151010", interval 5 day) comment "portokala_comment" DO insert into t_event3 values (unix_timestamp(), rand()); select count(*) from t_event3; count(*) 0 drop event event3; drop table t_event3; set names utf8; CREATE EVENT root6 ON SCHEDULE EVERY '10:20' MINUTE_SECOND ON COMPLETION PRESERVE ENABLE COMMENT 'some comment' DO select 1; SHOW CREATE EVENT root6; Event sql_mode time_zone Create Event root6 SYSTEM CREATE EVENT `root6` ON SCHEDULE EVERY '10:20' MINUTE_SECOND STARTS '#' ON COMPLETION PRESERVE ENABLE COMMENT 'some comment' DO select 1 create event root7 on schedule every 2 year do select 1; SHOW CREATE EVENT root7; Event sql_mode time_zone Create Event root7 SYSTEM CREATE EVENT `root7` ON SCHEDULE EVERY 2 YEAR STARTS '#' ON COMPLETION NOT PRESERVE ENABLE DO select 1 create event root8 on schedule every '2:5' year_month do select 1; SHOW CREATE EVENT root8; Event sql_mode time_zone Create Event root8 SYSTEM CREATE EVENT `root8` ON SCHEDULE EVERY '2-5' YEAR_MONTH STARTS '#' ON COMPLETION NOT PRESERVE ENABLE DO select 1 create event root8_1 on schedule every '2:15' year_month do select 1; SHOW CREATE EVENT root8_1; Event sql_mode time_zone Create Event root8_1 SYSTEM CREATE EVENT `root8_1` ON SCHEDULE EVERY '3-3' YEAR_MONTH STARTS '#' ON COMPLETION NOT PRESERVE ENABLE DO select 1 create event root9 on schedule every 2 week ON COMPLETION PRESERVE DISABLE COMMENT 'коментар на кирилица' do select 1; SHOW CREATE EVENT root9; Event sql_mode time_zone Create Event root9 SYSTEM CREATE EVENT `root9` ON SCHEDULE EVERY 2 WEEK STARTS '#' ON COMPLETION PRESERVE DISABLE COMMENT 'коментар на кирилица' DO select 1 create event root10 on schedule every '20:5' day_hour do select 1; SHOW CREATE EVENT root10; Event sql_mode time_zone Create Event root10 SYSTEM CREATE EVENT `root10` ON SCHEDULE EVERY '20 5' DAY_HOUR STARTS '#' ON COMPLETION NOT PRESERVE ENABLE DO select 1 create event root11 on schedule every '20:25' day_hour do select 1; SHOW CREATE EVENT root11; Event sql_mode time_zone Create Event root11 SYSTEM CREATE EVENT `root11` ON SCHEDULE EVERY '21 1' DAY_HOUR STARTS '#' ON COMPLETION NOT PRESERVE ENABLE DO select 1 create event root12 on schedule every '20:25' hour_minute do select 1; SHOW CREATE EVENT root12; Event sql_mode time_zone Create Event root12 SYSTEM CREATE EVENT `root12` ON SCHEDULE EVERY '20:25' HOUR_MINUTE STARTS '#' ON COMPLETION NOT PRESERVE ENABLE DO select 1 create event root13 on schedule every '25:25' hour_minute do select 1; SHOW CREATE EVENT root13; Event sql_mode time_zone Create Event root13 SYSTEM CREATE EVENT `root13` ON SCHEDULE EVERY '25:25' HOUR_MINUTE STARTS '#' ON COMPLETION NOT PRESERVE ENABLE DO select 1 create event root13_1 on schedule every '11:65' hour_minute do select 1; SHOW CREATE EVENT root13_1; Event sql_mode time_zone Create Event root13_1 SYSTEM CREATE EVENT `root13_1` ON SCHEDULE EVERY '12:5' HOUR_MINUTE STARTS '#' ON COMPLETION NOT PRESERVE ENABLE DO select 1 create event root14 on schedule every '35:35' minute_second do select 1; SHOW CREATE EVENT root14; Event sql_mode time_zone Create Event root14 SYSTEM CREATE EVENT `root14` ON SCHEDULE EVERY '35:35' MINUTE_SECOND STARTS '#' ON COMPLETION NOT PRESERVE ENABLE DO select 1 create event root15 on schedule every '35:66' minute_second do select 1; SHOW CREATE EVENT root15; Event sql_mode time_zone Create Event root15 SYSTEM CREATE EVENT `root15` ON SCHEDULE EVERY '36:6' MINUTE_SECOND STARTS '#' ON COMPLETION NOT PRESERVE ENABLE DO select 1 create event root16 on schedule every '35:56' day_minute do select 1; SHOW CREATE EVENT root16; Event sql_mode time_zone Create Event root16 SYSTEM CREATE EVENT `root16` ON SCHEDULE EVERY '1 11:56' DAY_MINUTE STARTS '#' ON COMPLETION NOT PRESERVE ENABLE DO select 1 create event root17 on schedule every '35:12:45' day_minute do select 1; SHOW CREATE EVENT root17; Event sql_mode time_zone Create Event root17 SYSTEM CREATE EVENT `root17` ON SCHEDULE EVERY '35 12:45' DAY_MINUTE STARTS '#' ON COMPLETION NOT PRESERVE ENABLE DO select 1 create event root17_1 on schedule every '35:25:65' day_minute do select 1; SHOW CREATE EVENT root17_1; Event sql_mode time_zone Create Event root17_1 SYSTEM CREATE EVENT `root17_1` ON SCHEDULE EVERY '36 2:5' DAY_MINUTE STARTS '#' ON COMPLETION NOT PRESERVE ENABLE DO select 1 create event root18 on schedule every '35:12:45' hour_second do select 1; SHOW CREATE EVENT root18; Event sql_mode time_zone Create Event root18 SYSTEM CREATE EVENT `root18` ON SCHEDULE EVERY '35:12:45' HOUR_SECOND STARTS '#' ON COMPLETION NOT PRESERVE ENABLE DO select 1 create event root19 on schedule every '15:59:85' hour_second do select 1; SHOW CREATE EVENT root19; Event sql_mode time_zone Create Event root19 SYSTEM CREATE EVENT `root19` ON SCHEDULE EVERY '16:0:25' HOUR_SECOND STARTS '#' ON COMPLETION NOT PRESERVE ENABLE DO select 1 create event root20 on schedule every '50:20:12:45' day_second do select 1; SHOW CREATE EVENT root20; Event sql_mode time_zone Create Event root20 SYSTEM CREATE EVENT `root20` ON SCHEDULE EVERY '50 20:12:45' DAY_SECOND STARTS '#' ON COMPLETION NOT PRESERVE ENABLE DO select 1 set names cp1251; create event ����21 on schedule every '50:23:59:95' day_second COMMENT '���� � 1251 ��������' do select 1; SHOW CREATE EVENT ����21; Event sql_mode time_zone Create Event ����21 SYSTEM CREATE EVENT `����21` ON SCHEDULE EVERY '51 0:0:35' DAY_SECOND STARTS '#' ON COMPLETION NOT PRESERVE ENABLE COMMENT '���� � 1251 ��������' DO select 1 insert into mysql.event (db, name, body, definer, interval_value, interval_field) values (database(), "root22", "select 1", user(), 100, "SECOND_MICROSECOND"); show create event root22; ERROR 42000: This version of MySQL doesn't yet support 'MICROSECOND' SHOW EVENTS; ERROR 42000: This version of MySQL doesn't yet support 'MICROSECOND' drop event root22; create event root23 on schedule every -100 year do select 1; ERROR HY000: INTERVAL is either not positive or too big create event root23 on schedule every 222222222222222222222 year do select 1; ERROR HY000: INTERVAL is either not positive or too big drop event root6; drop event root7; drop event root8; drop event root8_1; drop event root9; drop event root10; drop event root11; drop event root12; drop event root13; drop event root13_1; drop event root14; drop event root15; drop event root16; drop event root17; drop event root17_1; drop event root18; drop event root19; drop event root20; drop event ����21; set names latin1; Create a test event. Only event metadata is relevant, the actual schedule and body are not. CREATE EVENT intact_check ON SCHEDULE EVERY 10 HOUR DO SELECT "nothing"; SHOW EVENTS; Db Name Definer Time zone Type Execute at Interval value Interval field Starts Ends Status events_test intact_check root@localhost SYSTEM RECURRING NULL 10 # # NULL ENABLED Try to alter mysql.event: the server should fail to load event information after mysql.event was tampered with. First, let's add a column to the end and make sure everything works as before ALTER TABLE mysql.event ADD dummy INT; SHOW EVENTS; Db Name Definer Time zone Type Execute at Interval value Interval field Starts Ends Status events_test intact_check root@localhost SYSTEM RECURRING NULL 10 # # NULL ENABLED SELECT event_name FROM INFORMATION_SCHEMA.events; event_name intact_check SHOW CREATE EVENT intact_check; Event sql_mode time_zone Create Event intact_check SYSTEM CREATE EVENT `intact_check` ON SCHEDULE EVERY 10 HOUR STARTS '#' ON COMPLETION NOT PRESERVE ENABLE DO SELECT "nothing" DROP EVENT no_such_event; ERROR HY000: Unknown event 'no_such_event' CREATE EVENT intact_check_1 ON SCHEDULE EVERY 5 HOUR DO SELECT 5; ALTER EVENT intact_check_1 ON SCHEDULE EVERY 8 HOUR DO SELECT 8; ALTER EVENT intact_check_1 RENAME TO intact_check_2; DROP EVENT intact_check_1; ERROR HY000: Unknown event 'intact_check_1' DROP EVENT intact_check_2; DROP EVENT intact_check; DROP DATABASE IF EXISTS mysqltest_no_such_database; Warnings: Note 1008 Can't drop database 'mysqltest_no_such_database'; database doesn't exist CREATE DATABASE mysqltest_db2; DROP DATABASE mysqltest_db2; SELECT @@event_scheduler; @@event_scheduler OFF SHOW VARIABLES LIKE 'event_scheduler'; Variable_name Value event_scheduler OFF SET GLOBAL event_scheduler=OFF; ALTER TABLE mysql.event DROP dummy; CREATE EVENT intact_check ON SCHEDULE EVERY 10 HOUR DO SELECT "nothing"; Now let's add a column to the first position: the server expects to see event schema name there ALTER TABLE mysql.event ADD dummy INT FIRST; SHOW EVENTS; ERROR HY000: Cannot load from mysql.event. The table is probably corrupted SELECT event_name FROM INFORMATION_SCHEMA.events; ERROR HY000: Cannot load from mysql.event. The table is probably corrupted SHOW CREATE EVENT intact_check; ERROR HY000: Unknown event 'intact_check' DROP EVENT no_such_event; ERROR HY000: Unknown event 'no_such_event' CREATE EVENT intact_check_1 ON SCHEDULE EVERY 5 HOUR DO SELECT 5; ERROR HY000: Cannot load from mysql.event. The table is probably corrupted ALTER EVENT intact_check_1 ON SCHEDULE EVERY 8 HOUR DO SELECT 8; ERROR HY000: Unknown event 'intact_check_1' ALTER EVENT intact_check_1 RENAME TO intact_check_2; ERROR HY000: Unknown event 'intact_check_1' DROP EVENT intact_check_1; ERROR HY000: Unknown event 'intact_check_1' DROP EVENT intact_check_2; ERROR HY000: Unknown event 'intact_check_2' DROP EVENT intact_check; ERROR HY000: Unknown event 'intact_check' DROP DATABASE IF EXISTS mysqltest_no_such_database; Warnings: Note 1008 Can't drop database 'mysqltest_no_such_database'; database doesn't exist CREATE DATABASE mysqltest_db2; DROP DATABASE mysqltest_db2; SELECT @@event_scheduler; @@event_scheduler OFF SHOW VARIABLES LIKE 'event_scheduler'; Variable_name Value event_scheduler OFF SET GLOBAL event_scheduler=OFF; Clean up ALTER TABLE mysql.event DROP dummy; DELETE FROM mysql.event; CREATE EVENT intact_check ON SCHEDULE EVERY 10 HOUR DO SELECT "nothing"; Back up the table, further changes are not reversible CREATE TABLE event_like LIKE mysql.event; INSERT INTO event_like SELECT * FROM mysql.event; Drop some columns and try more checks. ALTER TABLE mysql.event DROP comment, DROP starts; SHOW EVENTS; ERROR HY000: Cannot load from mysql.event. The table is probably corrupted SELECT event_name FROM INFORMATION_SCHEMA.EVENTS; ERROR HY000: Cannot load from mysql.event. The table is probably corrupted SHOW CREATE EVENT intact_check; ERROR HY000: Cannot load from mysql.event. The table is probably corrupted DROP EVENT no_such_event; ERROR HY000: Unknown event 'no_such_event' CREATE EVENT intact_check_1 ON SCHEDULE EVERY 5 HOUR DO SELECT 5; ERROR HY000: Column count of mysql.event is wrong. Expected 17, found 15. The table is probably corrupted ALTER EVENT intact_check_1 ON SCHEDULE EVERY 8 HOUR DO SELECT 8; ERROR HY000: Unknown event 'intact_check_1' ALTER EVENT intact_check_1 RENAME TO intact_check_2; ERROR HY000: Unknown event 'intact_check_1' DROP EVENT intact_check_1; ERROR HY000: Unknown event 'intact_check_1' DROP EVENT intact_check_2; ERROR HY000: Unknown event 'intact_check_2' DROP EVENT intact_check; DROP DATABASE IF EXISTS mysqltest_no_such_database; Warnings: Note 1008 Can't drop database 'mysqltest_no_such_database'; database doesn't exist CREATE DATABASE mysqltest_db2; DROP DATABASE mysqltest_db2; SELECT @@event_scheduler; @@event_scheduler OFF SHOW VARIABLES LIKE 'event_scheduler'; Variable_name Value event_scheduler OFF SET GLOBAL event_scheduler=OFF; Now drop the table, and test again DROP TABLE mysql.event; SHOW EVENTS; ERROR 42S02: Table 'mysql.event' doesn't exist SELECT event_name FROM INFORMATION_SCHEMA.events; ERROR 42S02: Table 'mysql.event' doesn't exist SHOW CREATE EVENT intact_check; ERROR 42S02: Table 'mysql.event' doesn't exist DROP EVENT no_such_event; ERROR 42S02: Table 'mysql.event' doesn't exist CREATE EVENT intact_check_1 ON SCHEDULE EVERY 5 HOUR DO SELECT 5; ERROR 42S02: Table 'mysql.event' doesn't exist ALTER EVENT intact_check_1 ON SCHEDULE EVERY 8 HOUR DO SELECT 8; ERROR 42S02: Table 'mysql.event' doesn't exist ALTER EVENT intact_check_1 RENAME TO intact_check_2; ERROR 42S02: Table 'mysql.event' doesn't exist DROP EVENT intact_check_1; ERROR 42S02: Table 'mysql.event' doesn't exist DROP EVENT intact_check_2; ERROR 42S02: Table 'mysql.event' doesn't exist DROP EVENT intact_check; ERROR 42S02: Table 'mysql.event' doesn't exist DROP DATABASE IF EXISTS mysqltest_no_such_database; Warnings: Note 1008 Can't drop database 'mysqltest_no_such_database'; database doesn't exist Error 1146 Table 'mysql.event' doesn't exist CREATE DATABASE mysqltest_db2; DROP DATABASE mysqltest_db2; OK, there is an unnecessary warning about the non-existent table but it's not easy to fix and no one complained about it. A similar warning is printed if mysql.proc is missing. SHOW WARNINGS; Level Code Message Error 1146 Table 'mysql.event' doesn't exist SELECT @@event_scheduler; @@event_scheduler OFF SHOW VARIABLES LIKE 'event_scheduler'; Variable_name Value event_scheduler OFF SET GLOBAL event_scheduler=OFF; Restore the original table. CREATE TABLE mysql.event like event_like; DROP TABLE event_like; SHOW EVENTS; Db Name Definer Time zone Type Execute at Interval value Interval field Starts Ends Status create event e_26 on schedule at '2017-01-01 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 2017-01-01 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; set event_scheduler=off; ERROR HY000: Variable 'event_scheduler' is a GLOBAL variable and should be set with SET GLOBAL set global event_scheduler=3; ERROR 42000: Variable 'event_scheduler' can't be set to the value of '3' set global event_scheduler=disabled; ERROR 42000: Variable 'event_scheduler' can't be set to the value of 'disabled' "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 1 process" select /*1*/ user, host, db, command, state, info from information_schema.processlist where (command!='Daemon' || user='event_scheduler') and (info is null or info not like '%processlist%') 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); "Let some time pass to the event starts" "Should have only 2 processes: the scheduler and the locked event" select /*2*/ user, host, db, command, state, info from information_schema.processlist where (command!='Daemon' || user='event_scheduler') and (info is null or info not like '%processlist%') 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." "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 3 processes: the scheduler, our conn and the locked event" select /*3*/ user, host, db, command, state, info from information_schema.processlist where (command!='Daemon' || user='event_scheduler') and (info is null or info not like '%processlist%') 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 (command!='Daemon' || user='event_scheduler') and (info is null or info not like '%processlist%') order by info; user host db command state info root localhost events_test Connect User lock select get_lock("test_lock2_1", 20) 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 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 e1 SYSTEM CREATE EVENT `e1` ON SCHEDULE EVERY 10 HOUR STARTS '#' ON COMPLETION NOT PRESERVE ENABLE DO select 1 select event_name from information_schema.events; event_name e1 create event e2 on schedule every 10 hour do select 1; ERROR HY000: Table 'event' was not locked with LOCK TABLES alter event e2 disable; ERROR HY000: Table 'event' was not locked with LOCK TABLES alter event e2 rename to e3; ERROR HY000: Table 'event' was not locked with LOCK TABLES drop event e2; ERROR HY000: Table 'event' was not locked with LOCK TABLES drop event e1; ERROR HY000: Table 'event' was not locked with LOCK TABLES unlock tables; lock table t1 write; show create event e1; Event sql_mode time_zone Create Event e1 SYSTEM CREATE EVENT `e1` ON SCHEDULE EVERY 10 HOUR STARTS '#' ON COMPLETION NOT PRESERVE ENABLE DO select 1 select event_name from information_schema.events; event_name e1 create event e2 on schedule every 10 hour do select 1; ERROR HY000: Table 'event' was not locked with LOCK TABLES alter event e2 disable; ERROR HY000: Table 'event' was not locked with LOCK TABLES alter event e2 rename to e3; ERROR HY000: Table 'event' was not locked with LOCK TABLES drop event e2; ERROR HY000: Table 'event' was not locked with LOCK TABLES drop event e1; ERROR HY000: Table 'event' was not locked with LOCK TABLES unlock tables; lock table t1 read, mysql.event read; show create event e1; Event sql_mode time_zone Create Event e1 SYSTEM CREATE EVENT `e1` ON SCHEDULE EVERY 10 HOUR STARTS '#' ON COMPLETION NOT PRESERVE ENABLE DO select 1 select event_name from information_schema.events; event_name e1 create event e2 on schedule every 10 hour do select 1; ERROR HY000: Table 'event' was locked with a READ lock and can't be updated alter event e2 disable; ERROR HY000: Table 'event' was locked with a READ lock and can't be updated alter event e2 rename to e3; ERROR HY000: Table 'event' was locked with a READ lock and can't be updated drop event e2; ERROR HY000: Table 'event' was locked with a READ lock and can't be updated drop event e1; ERROR HY000: Table 'event' was locked with a READ lock and can't be updated unlock tables; lock table t1 write, mysql.event read; show create event e1; Event sql_mode time_zone Create Event e1 SYSTEM CREATE EVENT `e1` ON SCHEDULE EVERY 10 HOUR STARTS '#' ON COMPLETION NOT PRESERVE ENABLE DO select 1 select event_name from information_schema.events; event_name e1 create event e2 on schedule every 10 hour do select 1; ERROR HY000: Table 'event' was locked with a READ lock and can't be updated alter event e2 disable; ERROR HY000: Table 'event' was locked with a READ lock and can't be updated alter event e2 rename to e3; ERROR HY000: Table 'event' was locked with a READ lock and can't be updated drop event e2; ERROR HY000: Table 'event' was locked with a READ lock and can't be updated drop event e1; ERROR HY000: Table 'event' was locked with a READ lock and can't be updated 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 e1 SYSTEM CREATE EVENT `e1` ON SCHEDULE EVERY 10 HOUR STARTS '#' ON COMPLETION NOT PRESERVE ENABLE DO select 1 select event_name from information_schema.events; event_name e1 create event e2 on schedule every 10 hour do select 1; alter event e2 disable; alter event e2 rename to e3; drop event e3; drop event e1; unlock tables; 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| drop database events_test;