mariadb/mysql-test/t/trigger.test

#
# Basic triggers test
#

--disable_warnings
drop table if exists t1, t2, t3;
drop view if exists v1;
drop database if exists mysqltest;
drop function if exists f1;
--enable_warnings

create table t1 (i int);

# let us test some very simple trigger
create trigger trg before insert on t1 for each row set @a:=1;
set @a:=0;
select @a;
insert into t1 values (1);
select @a;
drop trigger t1.trg;

# let us test simple trigger reading some values 
create trigger trg before insert on t1 for each row set @a:=new.i;
insert into t1 values (123);
select @a;
drop trigger t1.trg;

drop table t1;

# Let us test before insert trigger
# Such triggers can be used for setting complex default values
create table t1 (i int not null, j int);
delimiter |;
create trigger trg before insert on t1 for each row 
begin 
  if isnull(new.j) then
    set new.j:= new.i * 10;
  end if;
end|
insert into t1 (i) values (1)|
insert into t1 (i,j) values (2, 3)|
select * from t1|
drop trigger t1.trg|
drop table t1|
delimiter ;|

# After insert trigger
# Useful for aggregating data
create table t1 (i int not null primary key);
create trigger trg after insert on t1 for each row 
  set @a:= if(@a,concat(@a, ":", new.i), new.i);
set @a:="";
insert into t1 values (2),(3),(4),(5);
select @a;
drop trigger t1.trg;
drop table t1;

# PS doesn't work with multi-row statements
--disable_ps_protocol
# Before update trigger
# (In future we will achieve this via proper error handling in triggers)
create table t1 (aid int not null primary key, balance int not null default 0);
insert into t1 values (1, 1000), (2,3000);
delimiter |;
create trigger trg before update on t1 for each row 
begin
  declare loc_err varchar(255);
  if abs(new.balance - old.balance) > 1000 then
    set new.balance:= old.balance;
    set loc_err := concat("Too big change for aid = ", new.aid);
    set @update_failed:= if(@update_failed, concat(@a, ":", loc_err), loc_err);
  end if;
end|
set @update_failed:=""|
update t1 set balance=1500|
select @update_failed;
select * from t1|
drop trigger t1.trg|
drop table t1|
delimiter ;|
--enable_ps_protocol

# After update trigger
create table t1 (i int);
insert into t1 values (1),(2),(3),(4);
create trigger trg after update on t1 for each row 
  set @total_change:=@total_change + new.i - old.i;
set @total_change:=0;
update t1 set i=3;
select @total_change;
drop trigger t1.trg;
drop table t1;

# Before delete trigger
# This can be used for aggregation too :)
create table t1 (i int);
insert into t1 values (1),(2),(3),(4);
create trigger trg before delete on t1 for each row 
  set @del_sum:= @del_sum + old.i;
set @del_sum:= 0;
delete from t1 where i <= 3;
select @del_sum;
drop trigger t1.trg;
drop table t1;

# After delete trigger. 
# Just run out of imagination.
create table t1 (i int);
insert into t1 values (1),(2),(3),(4);
create trigger trg after delete on t1 for each row set @del:= 1;
set @del:= 0;
delete from t1 where i <> 0;
select @del;
drop trigger t1.trg;
drop table t1;

# Several triggers on one table
create table t1 (i int, j int);

delimiter |;
create trigger trg1 before insert on t1 for each row 
begin
  if new.j > 10 then
    set new.j := 10;
  end if;
end|
create trigger trg2 before update on t1 for each row 
begin
  if old.i % 2 = 0 then
    set new.j := -1;
  end if;
end|
create trigger trg3 after update on t1 for each row 
begin
  if new.j = -1 then
    set @fired:= "Yes";
  end if;
end|
delimiter ;|
set @fired:="";
insert into t1 values (1,2),(2,3),(3,14);
select @fired;
select * from t1;
update t1 set j= 20;
select @fired;
select * from t1;

drop trigger t1.trg1;
drop trigger t1.trg2;
drop trigger t1.trg3;
drop table t1;


# Let us test how triggers work for special forms of INSERT such as
# REPLACE and INSERT ... ON DUPLICATE KEY UPDATE
create table t1 (id int not null primary key, data int);
create trigger t1_bi before insert on t1 for each row
  set @log:= concat(@log, "(BEFORE_INSERT: new=(id=", new.id, ", data=", new.data,"))");
create trigger t1_ai after insert on t1 for each row
  set @log:= concat(@log, "(AFTER_INSERT: new=(id=", new.id, ", data=", new.data,"))");
create trigger t1_bu before update on t1 for each row
  set @log:= concat(@log, "(BEFORE_UPDATE: old=(id=", old.id, ", data=", old.data,
                                        ") new=(id=", new.id, ", data=", new.data,"))");
create trigger t1_au after update on t1 for each row
  set @log:= concat(@log, "(AFTER_UPDATE: old=(id=", old.id, ", data=", old.data,
                                       ") new=(id=", new.id, ", data=", new.data,"))");
create trigger t1_bd before delete on t1 for each row
  set @log:= concat(@log, "(BEFORE_DELETE: old=(id=", old.id, ", data=", old.data,"))");
create trigger t1_ad after delete on t1 for each row
  set @log:= concat(@log, "(AFTER_DELETE: old=(id=", old.id, ", data=", old.data,"))");
# Simple INSERT - both triggers should be called
set @log:= "";
insert into t1 values (1, 1);
select @log;
# INSERT IGNORE for already existing key - only before trigger should fire
set @log:= "";
insert ignore t1 values (1, 2);
select @log;
# REPLACE: before insert trigger should be called for both records,
#          but then for first one update will be executed (and both update
#          triggers should fire). For second after insert trigger will be
#          called as for usual insert
set @log:= "";
replace t1 values (1, 3), (2, 2);
select @log;
# Now let us change table in such way that REPLACE on won't be executed
# using update.
alter table t1 add ts timestamp default now();
set @log:= "";
# This REPLACE should be executed via DELETE and INSERT so proper 
# triggers should be invoked.
replace t1 (id, data) values (1, 4);
select @log;
# Finally let us test INSERT ... ON DUPLICATE KEY UPDATE ...
set @log:= "";
insert into t1 (id, data) values (1, 5), (3, 3) on duplicate key update data= data + 2; 
select @log;

# This also drops associated triggers
drop table t1;


#
# Let us test triggers which access other tables.
#
# Trivial trigger which inserts data into another table
create table t1 (id int primary key, data varchar(10), fk int);
create table t2 (event varchar(100));
create table t3 (id int primary key);
create trigger t1_ai after insert on t1 for each row 
  insert into t2 values (concat("INSERT INTO t1 id=", new.id, " data='", new.data, "'"));
insert into t1 (id, data) values (1, "one"), (2, "two");
select * from t1;
select * from t2;
drop trigger t1.t1_ai;
# Trigger which uses couple of tables (and partially emulates FK constraint)
delimiter |;
create trigger t1_bi before insert on t1 for each row
begin
  if exists (select id from t3 where id=new.fk) then
    insert into t2 values (concat("INSERT INTO t1 id=", new.id, " data='", new.data, "' fk=", new.fk));
  else
    insert into t2 values (concat("INSERT INTO t1 FAILED id=", new.id, " data='", new.data, "' fk=", new.fk));
    set new.id= NULL;
  end if;
end|
delimiter ;|
insert into t3 values (1);
--error 1048
insert into t1 values (4, "four", 1), (5, "five", 2);
select * from t1;
select * from t2;
drop table t1, t2, t3;
# Trigger which invokes function
create table t1 (id int primary key, data varchar(10));
create table t2 (seq int);
insert into t2 values (10);
create function f1 () returns int return (select max(seq) from t2);
delimiter |;
create trigger t1_bi before insert on t1 for each row
begin
  if new.id > f1() then
    set new.id:= f1();
  end if;
end|
delimiter ;|
insert into t1 values (1, "first");
insert into t1 values (f1(), "max");
select * from t1;
drop table t1, t2;
drop function f1;
# Trigger which forces invocation of another trigger
# (emulation of FK on delete cascade policy)
create table t1 (id int primary key, fk_t2 int);
create table t2 (id int primary key, fk_t3 int);
create table t3 (id int primary key);
insert into t1 values (1,1), (2,1), (3,2);
insert into t2 values (1,1), (2,2);
insert into t3 values (1), (2);
create trigger t3_ad after delete on t3 for each row
  delete from t2 where fk_t3=old.id;
create trigger t2_ad after delete on t2 for each row
  delete from t1 where fk_t2=old.id;
delete from t3 where id = 1;
select * from t1 left join (t2 left join t3 on t2.fk_t3 = t3.id) on t1.fk_t2 = t2.id;
drop table t1, t2, t3;
# Trigger which assigns value selected from table to field of row
# being inserted/updated.
create table t1 (id int primary key, copy int);
create table t2 (id int primary key, data int);
insert into t2 values (1,1), (2,2);
create trigger t1_bi before insert on t1 for each row
  set new.copy= (select data from t2 where id = new.id);
create trigger t1_bu before update on t1 for each row
  set new.copy= (select data from t2 where id = new.id);
insert into t1 values (1,3), (2,4), (3,3);
update t1 set copy= 1 where id = 2;
select * from t1;
drop table t1, t2;

#
# Test of wrong column specifiers in triggers
#
create table t1 (i int);

--error 1363
create trigger trg before insert on t1 for each row set @a:= old.i;
--error 1363
create trigger trg before delete on t1 for each row set @a:= new.i;
--error 1362
create trigger trg before update on t1 for each row set old.i:=1;
--error 1363
create trigger trg before delete on t1 for each row set new.i:=1;
--error 1362
create trigger trg after update on t1 for each row set new.i:=1;
--error 1054
create trigger trg before update on t1 for each row set new.j:=1;
--error 1054
create trigger trg before update on t1 for each row set @a:=old.j;


#
# Let us test various trigger creation errors
#
#
--error 1146
create trigger trg before insert on t2 for each row set @a:=1;

create trigger trg before insert on t1 for each row set @a:=1;
--error 1359
create trigger trg after insert on t1 for each row set @a:=1;
--error 1359
create trigger trg2 before insert on t1 for each row set @a:=1;
drop trigger t1.trg;

--error 1360
drop trigger t1.trg;

create view v1 as select * from t1;
--error 1361
create trigger trg before insert on v1 for each row set @a:=1;
drop view v1;

drop table t1;

create temporary table t1 (i int);
--error 1361
create trigger trg before insert on t1 for each row set @a:=1;
drop table t1;



#
# Tests for various trigger-related bugs
#

# Test for bug #5887 "Triggers with string literals cause errors".
# New .FRM parser was not handling escaped strings properly.
create table t1 (x1col char);  
create trigger tx1 before insert on t1 for each row set new.x1col = 'x';
insert into t1 values ('y');
drop trigger t1.tx1;
drop table t1;

#
# Test for bug #5890 "Triggers fail for DELETE without WHERE".
# If we are going to delete all rows in table but DELETE triggers exist
# we should perform row-by-row deletion instead of using optimized
# delete_all_rows() method.
#
create table t1 (i int) engine=myisam;
insert into t1 values (1), (2);
create trigger trg1 before delete on t1 for each row set @del_before:= @del_before + old.i;
create trigger trg2 after delete on t1 for each row set @del_after:= @del_after + old.i;
set @del_before:=0, @del_after:= 0;
delete from t1;
select @del_before, @del_after;
drop trigger t1.trg1;
drop trigger t1.trg2;
drop table t1;

# Test for bug #5859 "DROP TABLE does not drop triggers". Trigger should not
# magically reappear when we recreate dropped table.
create table t1 (a int);
create trigger trg1 before insert on t1 for each row set new.a= 10;
drop table t1;
create table t1 (a int);
insert into t1 values ();
select * from t1;
drop table t1;

# Test for bug #6559 "DROP DATABASE forgets to drop triggers". 
create database mysqltest;
use mysqltest;
create table t1 (i int);
create trigger trg1 before insert on t1 for each row set @a:= 1;
# This should succeed
drop database mysqltest;
use test;

# Test for bug #5860 "Multi-table UPDATE does not activate update triggers"
# We will also test how delete triggers wor for multi-table DELETE.
create table t1 (i int, j int default 10, k int not null, key (k));
create table t2 (i int);
insert into t1 (i, k) values (1, 1);
insert into t2 values (1);
create trigger trg1 before update on t1 for each row set @a:= @a + new.j - old.j;
create trigger trg2 after update on t1 for each row set @b:= "Fired";
set @a:= 0, @b:= "";
# Check that trigger works in case of update on the fly
update t1, t2 set j = j + 10 where t1.i = t2.i;
select @a, @b;
insert into t1 values (2, 13, 2);
insert into t2 values (2);
set @a:= 0, @b:= "";
# And now let us check that triggers work in case of multi-update which
# is done through temporary tables...
update t1, t2 set j = j + 15 where t1.i = t2.i and t1.k >= 2;
select @a, @b;
# Let us test delete triggers for multi-delete now.
# We create triggers for both tables because we want test how they
# work in both on-the-fly and via-temp-tables cases.
create trigger trg3 before delete on t1 for each row set @c:= @c + old.j;
create trigger trg4 before delete on t2 for each row set @d:= @d + old.i;
create trigger trg5 after delete on t1 for each row set @e:= "After delete t1 fired";
create trigger trg6 after delete on t2 for each row set @f:= "After delete t2 fired";
set @c:= 0, @d:= 0, @e:= "", @f:= "";
delete t1, t2 from t1, t2 where t1.i = t2.i;
select @c, @d, @e, @f;
# This also will drop triggers
drop table t1, t2;

# Test for bug #6812 "Triggers are not activated for INSERT ... SELECT".
# (We also check the fact that trigger modifies some field does not affect
#  value of next record inserted).
delimiter |;
create table t1 (i int, j int default 10)|
create table t2 (i int)|
insert into t2 values (1), (2)|
create trigger trg1 before insert on t1 for each row 
begin
  if new.i = 1 then
    set new.j := 1;
  end if;
end|
create trigger trg2 after insert on t1 for each row set @a:= 1|
set @a:= 0|
insert into t1 (i) select * from t2|
select * from t1|
select @a|
# This also will drop triggers
drop table t1, t2|
delimiter ;|

# Test for bug #8755 "Trigger is not activated by LOAD DATA"
create table t1 (i int, j int, k int);
create trigger trg1 before insert on t1 for each row set new.k = new.i;
create trigger trg2 after insert on t1 for each row set @b:= "Fired"; 
set @b:="";
# Test triggers with file with separators
load data infile '../../std_data/rpl_loaddata.dat' into table t1 (@a, i);
select *, @b from t1;
set @b:="";
# Test triggers with fixed size row file
load data infile '../../std_data/loaddata5.dat' into table t1 fields terminated by '' enclosed by '' (i, j);
select *, @b from t1;
# This also will drop triggers
drop table t1;

# Test for bug #5894 "Triggers with altered tables cause corrupt databases"
# Also tests basic error handling for various kinds of triggers.
create table t1 (i int, at int, k int, key(k)) engine=myisam;
create table t2 (i int);
insert into t1 values (1, 1, 1);
# We need at least 3 elements in t2 to test multi-update properly
insert into t2 values (1), (2), (3);
# Create and then break "after" triggers
create trigger ai after insert on t1 for each row set @a:= new.at;
create trigger au after update on t1 for each row set @a:= new.at;
create trigger ad after delete on t1 for each row set @a:= old.at;
alter table t1 drop column at;
# We still should be able select data from tables.
select * from t1;
# The following statements changing t1 should fail, but still cause
# their main effect. This is because operation on the table row is
# executed before "after" trigger and its effect cannot be rolled back
# when whole statement fails, because t1 is MyISAM table.
--error 1054
insert into t1 values (2, 1);
select * from t1;
--error 1054
update t1 set k = 2 where i = 2;
select * from t1;
--error 1054
delete from t1 where i = 2;
select * from t1;
# Should fail and insert only 1 row
--error 1054
load data infile '../../std_data/loaddata5.dat' into table t1 fields terminated by '' enclosed by '' (i, k);
select * from t1;
--error 1054
insert into t1 select 3, 3;
select * from t1;
# Multi-update working on the fly, again it will update only
# one row even if more matches
--error 1054
update t1, t2 set k = k + 10 where t1.i = t2.i;
select * from t1;
# The same for multi-update via temp table
--error 1054
update t1, t2 set k = k + 10 where t1.i = t2.i and k < 3;
select * from t1;
# Multi-delete on the fly
--error 1054
delete t1, t2 from t1 straight_join t2 where t1.i = t2.i;
select * from t1;
# And via temporary storage
--error 1054
delete t2, t1 from t2 straight_join t1 where t1.i = t2.i;
select * from t1;
# Prepare table for testing of REPLACE and INSERT ... ON DUPLICATE KEY UPDATE
alter table t1 add primary key (i);
--error 1054
insert into t1 values (3, 4) on duplicate key update k= k + 10;
select * from t1;
--error 1054
replace into t1 values (3, 3);
select * from t1;
# Change table in such way that REPLACE will delete row
alter table t1 add ts timestamp default now();
--error 1054
replace into t1 (i, k) values (3, 13);
select * from t1;
# Also drops all triggers
drop table t1, t2;

create table t1 (i int, bt int, k int, key(k)) engine=myisam;
create table t2 (i int);
insert into t1 values (1, 1, 1), (2, 2, 2);
insert into t2 values (1), (2), (3);
# Create and then break "before" triggers
create trigger bi before insert on t1 for each row set @a:= new.bt;
create trigger bu before update on t1 for each row set @a:= new.bt;
create trigger bd before delete on t1 for each row set @a:= old.bt;
alter table t1 drop column bt;
# The following statements changing t1 should fail and should not
# cause any effect on table, since "before" trigger is executed 
# before operation on the table row.
--error 1054
insert into t1 values (3, 3);
select * from t1;
--error 1054
update t1 set i = 2;
select * from t1;
--error 1054
delete from t1;
select * from t1;
--error 1054
load data infile '../../std_data/loaddata5.dat' into table t1 fields terminated by '' enclosed by '' (i, k);
select * from t1;
--error 1054
insert into t1 select 3, 3;
select * from t1;
# Both types of multi-update (on the fly and via temp table)
--error 1054
update t1, t2 set k = k + 10 where t1.i = t2.i;
select * from t1;
--error 1054
update t1, t2 set k = k + 10 where t1.i = t2.i and k < 2;
select * from t1;
# Both types of multi-delete
--error 1054
delete t1, t2 from t1 straight_join t2 where t1.i = t2.i;
select * from t1;
--error 1054
delete t2, t1 from t2 straight_join t1 where t1.i = t2.i;
select * from t1;
# Let us test REPLACE/INSERT ... ON DUPLICATE KEY UPDATE.
# To test properly code-paths different from those that are used
# in ordinary INSERT we need to drop "before insert" trigger.
alter table t1 add primary key (i);
drop trigger t1.bi;
--error 1054
insert into t1 values (2, 4) on duplicate key update k= k + 10;
select * from t1;
--error 1054
replace into t1 values (2, 4);
select * from t1;
# Change table in such way that REPLACE will delete row
alter table t1 add ts timestamp default now();
--error 1054
replace into t1 (i, k) values (2, 11);
select * from t1;
# Also drops all triggers
drop table t1, t2;

# Test for bug #5893 "Triggers with dropped functions cause crashes"
# Appropriate error should be reported instead of crash.
--disable_warnings
drop function if exists bug5893;
--enable_warnings
create table t1 (col1 int, col2 int); 
insert into t1 values (1, 2);
create function bug5893 () returns int return 5;
create trigger t1_bu before update on t1 for each row set new.col1= bug5893();
drop function bug5893; 
--error 1305
update t1 set col2 = 4;
drop table t1;