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# DELETE
create table t (
s date, e date,
row_start SYS_TYPE as row start invisible,
row_end SYS_TYPE as row end invisible,
period for apptime(s, e),
period for system_time (row_start, row_end)) with system versioning;
insert into t values('1999-01-01', '2018-12-12'),
('1999-01-01', '1999-12-12');
select row_start into @ins_time from t limit 1;
select * from t order by s, e;
s e
1999-01-01 1999-12-12
1999-01-01 2018-12-12
delete from t for portion of apptime from '2000-01-01' to '2018-01-01';
select *, if(row_start = @ins_time, "OLD", "NEW"), check_row(row_start, row_end)
from t for system_time all
order by s, e, row_start;
s e if(row_start = @ins_time, "OLD", "NEW") check_row(row_start, row_end)
1999-01-01 1999-12-12 OLD CURRENT ROW
1999-01-01 2000-01-01 NEW CURRENT ROW
1999-01-01 2018-12-12 OLD HISTORICAL ROW
2018-01-01 2018-12-12 NEW CURRENT ROW
# same for trigger case
delete from t;
delete history from t;
insert into t values('1999-01-01', '2018-12-12'),
('1999-01-01', '1999-12-12');
create or replace table log_tbl(id int auto_increment primary key, log text) engine=myisam;
create or replace procedure log(s text)
insert into log_tbl(log) values(s);
create trigger tr1upd_t before update on t
for each row call log(CONCAT('>UPD: ', old.s, ", ", old.e, ' -> ', new.s, ", ", new.e));
create trigger tr2upd_t after update on t
for each row call log(CONCAT('<UPD: ', old.s, ", ", old.e, ' -> ', new.s, ", ", new.e));
create trigger tr1del_t before delete on t
for each row call log(CONCAT('>DEL: ', old.s, ", ", old.e));
create trigger tr2del_t after delete on t
for each row call log(CONCAT('<DEL: ', old.s, ", ", old.e));
create trigger tr1ins_t before insert on t
for each row call log(CONCAT('>INS: ', new.s, ", ", new.e));
create trigger tr2ins_t after insert on t
for each row call log(CONCAT('<INS: ', new.s, ", ", new.e));
select row_start into @ins_time from t limit 1;
select * from t order by s, e;
s e
1999-01-01 1999-12-12
1999-01-01 2018-12-12
delete from t for portion of apptime from '2000-01-01' to '2018-01-01';
select *, if(row_start = @ins_time, "OLD", "NEW"), check_row(row_start, row_end)
from t for system_time all
order by s, e, row_start;
s e if(row_start = @ins_time, "OLD", "NEW") check_row(row_start, row_end)
1999-01-01 1999-12-12 OLD CURRENT ROW
1999-01-01 2000-01-01 NEW CURRENT ROW
1999-01-01 2018-12-12 OLD HISTORICAL ROW
2018-01-01 2018-12-12 NEW CURRENT ROW
select * from log_tbl order by id;
id log
1 >DEL: 1999-01-01, 2018-12-12
2 >INS: 1999-01-01, 2000-01-01
3 <INS: 1999-01-01, 2000-01-01
4 >INS: 2018-01-01, 2018-12-12
5 <INS: 2018-01-01, 2018-12-12
6 <DEL: 1999-01-01, 2018-12-12
# UPDATE
create or replace table t (x int, s date, e date,
row_start SYS_TYPE as row start invisible,
row_end SYS_TYPE as row end invisible,
period for apptime(s, e),
period for system_time(row_start, row_end)) with system versioning;
insert into t values(1, '1999-01-01', '2018-12-12'),
(2, '1999-01-01', '1999-12-12');
select row_start into @ins_time from t limit 1;
select * from t;
x s e
1 1999-01-01 2018-12-12
2 1999-01-01 1999-12-12
update t for portion of apptime from '2000-01-01' to '2018-01-01' set x= x + 5;
select *, if(row_start = @ins_time, "OLD", "NEW"), check_row(row_start, row_end)
from t for system_time all
order by x, s, e, row_start;
x s e if(row_start = @ins_time, "OLD", "NEW") check_row(row_start, row_end)
1 1999-01-01 2000-01-01 NEW CURRENT ROW
1 1999-01-01 2018-12-12 OLD HISTORICAL ROW
1 2018-01-01 2018-12-12 NEW CURRENT ROW
2 1999-01-01 1999-12-12 OLD CURRENT ROW
6 2000-01-01 2018-01-01 NEW CURRENT ROW
drop table t,log_tbl;
drop function check_row;
drop function current_row;
drop procedure verify_trt;
drop procedure verify_trt_dummy;
drop procedure log;
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