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DROP DATABASE would internally execute DROP TABLE on every contained table and finally remove the directory. In InnoDB, DROP TABLE is sometimes executed in the background. The table would be renamed to a name that starts with #sql. The existence of these files would prevent DROP DATABASE from succeeding. CREATE OR REPLACE DATABASE can internally execute DROP DATABASE if the directory already exists. This could fail due to the InnoDB background DROP TABLE, possibly due to some tables that were leftovers from earlier tests.
95 lines
3.7 KiB
Plaintext
95 lines
3.7 KiB
Plaintext
# DELETE
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create table t (
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s date, e date,
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row_start SYS_TYPE as row start invisible,
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row_end SYS_TYPE as row end invisible,
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period for apptime(s, e),
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period for system_time (row_start, row_end)) with system versioning;
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insert into t values('1999-01-01', '2018-12-12'),
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('1999-01-01', '1999-12-12');
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select row_start into @ins_time from t limit 1;
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select * from t order by s, e;
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s e
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1999-01-01 1999-12-12
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1999-01-01 2018-12-12
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delete from t for portion of apptime from '2000-01-01' to '2018-01-01';
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select *, if(row_start = @ins_time, "OLD", "NEW"), check_row(row_start, row_end)
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from t for system_time all
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order by s, e, row_start;
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s e if(row_start = @ins_time, "OLD", "NEW") check_row(row_start, row_end)
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1999-01-01 1999-12-12 OLD CURRENT ROW
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1999-01-01 2000-01-01 NEW CURRENT ROW
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1999-01-01 2018-12-12 OLD HISTORICAL ROW
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2018-01-01 2018-12-12 NEW CURRENT ROW
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# same for trigger case
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delete from t;
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delete history from t;
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insert into t values('1999-01-01', '2018-12-12'),
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('1999-01-01', '1999-12-12');
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create or replace table log_tbl(id int auto_increment primary key, log text) engine=myisam;
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create or replace procedure log(s text)
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insert into log_tbl(log) values(s);
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create trigger tr1upd_t before update on t
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for each row call log(CONCAT('>UPD: ', old.s, ", ", old.e, ' -> ', new.s, ", ", new.e));
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create trigger tr2upd_t after update on t
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for each row call log(CONCAT('<UPD: ', old.s, ", ", old.e, ' -> ', new.s, ", ", new.e));
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create trigger tr1del_t before delete on t
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for each row call log(CONCAT('>DEL: ', old.s, ", ", old.e));
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create trigger tr2del_t after delete on t
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for each row call log(CONCAT('<DEL: ', old.s, ", ", old.e));
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create trigger tr1ins_t before insert on t
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for each row call log(CONCAT('>INS: ', new.s, ", ", new.e));
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create trigger tr2ins_t after insert on t
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for each row call log(CONCAT('<INS: ', new.s, ", ", new.e));
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select row_start into @ins_time from t limit 1;
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select * from t order by s, e;
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s e
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1999-01-01 1999-12-12
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1999-01-01 2018-12-12
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delete from t for portion of apptime from '2000-01-01' to '2018-01-01';
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select *, if(row_start = @ins_time, "OLD", "NEW"), check_row(row_start, row_end)
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from t for system_time all
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order by s, e, row_start;
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s e if(row_start = @ins_time, "OLD", "NEW") check_row(row_start, row_end)
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1999-01-01 1999-12-12 OLD CURRENT ROW
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1999-01-01 2000-01-01 NEW CURRENT ROW
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1999-01-01 2018-12-12 OLD HISTORICAL ROW
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2018-01-01 2018-12-12 NEW CURRENT ROW
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select * from log_tbl order by id;
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id log
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1 >DEL: 1999-01-01, 2018-12-12
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2 >INS: 1999-01-01, 2000-01-01
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3 <INS: 1999-01-01, 2000-01-01
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4 >INS: 2018-01-01, 2018-12-12
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5 <INS: 2018-01-01, 2018-12-12
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6 <DEL: 1999-01-01, 2018-12-12
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# UPDATE
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create or replace table t (x int, s date, e date,
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row_start SYS_TYPE as row start invisible,
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row_end SYS_TYPE as row end invisible,
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period for apptime(s, e),
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period for system_time(row_start, row_end)) with system versioning;
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insert into t values(1, '1999-01-01', '2018-12-12'),
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(2, '1999-01-01', '1999-12-12');
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select row_start into @ins_time from t limit 1;
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select * from t;
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x s e
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1 1999-01-01 2018-12-12
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2 1999-01-01 1999-12-12
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update t for portion of apptime from '2000-01-01' to '2018-01-01' set x= x + 5;
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select *, if(row_start = @ins_time, "OLD", "NEW"), check_row(row_start, row_end)
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from t for system_time all
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order by x, s, e, row_start;
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x s e if(row_start = @ins_time, "OLD", "NEW") check_row(row_start, row_end)
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1 1999-01-01 2000-01-01 NEW CURRENT ROW
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1 1999-01-01 2018-12-12 OLD HISTORICAL ROW
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1 2018-01-01 2018-12-12 NEW CURRENT ROW
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2 1999-01-01 1999-12-12 OLD CURRENT ROW
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6 2000-01-01 2018-01-01 NEW CURRENT ROW
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drop table t,log_tbl;
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drop function check_row;
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drop function current_row;
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drop procedure verify_trt;
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drop procedure verify_trt_dummy;
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drop procedure log;
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