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d201074611
out of order". (final version) Now instead of binding Item_trigger_field to TABLE objects during trigger definition parsing at table open, we perform pass through special list of all such objects in trigger. This allows easily check all references to fields in old/new version of row in trigger during execution of CREATE TRIGGER statement (this is more courtesy for users since we can't check everything anyway). We also report that such reference is bad by returning error from Item_trigger_field::fix_fields() method (instead of setup_field()) This means that if trigger is broken we will bark during trigger execution instead of trigger definition parsing at table open. (i.e. now we allow to open tables with broken triggers).
192 lines
5.1 KiB
Text
192 lines
5.1 KiB
Text
drop table if exists t1, t2;
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drop view if exists v1;
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create table t1 (i int);
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create trigger trg before insert on t1 for each row set @a:=1;
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set @a:=0;
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select @a;
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@a
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0
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insert into t1 values (1);
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select @a;
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@a
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1
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drop trigger t1.trg;
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create trigger trg before insert on t1 for each row set @a:=new.i;
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insert into t1 values (123);
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select @a;
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@a
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123
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drop trigger t1.trg;
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drop table t1;
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create table t1 (i int not null, j int);
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create trigger trg before insert on t1 for each row
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begin
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if isnull(new.j) then
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set new.j:= new.i * 10;
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end if;
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end|
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insert into t1 (i) values (1)|
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insert into t1 (i,j) values (2, 3)|
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select * from t1|
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i j
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1 10
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2 3
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drop trigger t1.trg|
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drop table t1|
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create table t1 (i int not null primary key);
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create trigger trg after insert on t1 for each row
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set @a:= if(@a,concat(@a, ":", new.i), new.i);
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set @a:="";
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insert into t1 values (2),(3),(4),(5);
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select @a;
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@a
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2:3:4:5
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drop trigger t1.trg;
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drop table t1;
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create table t1 (aid int not null primary key, balance int not null default 0);
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insert into t1 values (1, 1000), (2,3000);
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create trigger trg before update on t1 for each row
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begin
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declare loc_err varchar(255);
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if abs(new.balance - old.balance) > 1000 then
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set new.balance:= old.balance;
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set loc_err := concat("Too big change for aid = ", new.aid);
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set @update_failed:= if(@update_failed, concat(@a, ":", loc_err), loc_err);
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end if;
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end|
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set @update_failed:=""|
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update t1 set balance=1500|
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select @update_failed;
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select * from t1|
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@update_failed
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Too big change for aid = 2
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aid balance
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1 1500
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2 3000
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drop trigger t1.trg|
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drop table t1|
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create table t1 (i int);
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insert into t1 values (1),(2),(3),(4);
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create trigger trg after update on t1 for each row
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set @total_change:=@total_change + new.i - old.i;
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set @total_change:=0;
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update t1 set i=3;
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select @total_change;
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@total_change
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2
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drop trigger t1.trg;
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drop table t1;
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create table t1 (i int);
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insert into t1 values (1),(2),(3),(4);
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create trigger trg before delete on t1 for each row
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set @del_sum:= @del_sum + old.i;
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set @del_sum:= 0;
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delete from t1 where i <= 3;
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select @del_sum;
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@del_sum
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6
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drop trigger t1.trg;
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drop table t1;
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create table t1 (i int);
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insert into t1 values (1),(2),(3),(4);
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create trigger trg after delete on t1 for each row set @del:= 1;
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set @del:= 0;
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delete from t1 where i <> 0;
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select @del;
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@del
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1
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drop trigger t1.trg;
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drop table t1;
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create table t1 (i int, j int);
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create trigger trg1 before insert on t1 for each row
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begin
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if new.j > 10 then
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set new.j := 10;
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end if;
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end|
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create trigger trg2 before update on t1 for each row
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begin
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if old.i % 2 = 0 then
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set new.j := -1;
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end if;
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end|
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create trigger trg3 after update on t1 for each row
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begin
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if new.j = -1 then
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set @fired:= "Yes";
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end if;
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end|
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set @fired:="";
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insert into t1 values (1,2),(2,3),(3,14);
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select @fired;
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@fired
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select * from t1;
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i j
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1 2
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2 3
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3 10
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update t1 set j= 20;
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select @fired;
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@fired
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Yes
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select * from t1;
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i j
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1 20
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2 -1
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3 20
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drop trigger t1.trg1;
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drop trigger t1.trg2;
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drop trigger t1.trg3;
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drop table t1;
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create table t1 (i int);
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create trigger trg before insert on t1 for each row set @a:= old.i;
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ERROR HY000: There is no OLD row in on INSERT trigger
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create trigger trg before delete on t1 for each row set @a:= new.i;
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ERROR HY000: There is no NEW row in on DELETE trigger
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create trigger trg before update on t1 for each row set old.i:=1;
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ERROR HY000: Updating of OLD row is not allowed in trigger
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create trigger trg before delete on t1 for each row set new.i:=1;
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ERROR HY000: There is no NEW row in on DELETE trigger
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create trigger trg after update on t1 for each row set new.i:=1;
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ERROR HY000: Updating of NEW row is not allowed in after trigger
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create trigger trg before update on t1 for each row set new.j:=1;
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ERROR 42S22: Unknown column 'j' in 'NEW'
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create trigger trg before update on t1 for each row set @a:=old.j;
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ERROR 42S22: Unknown column 'j' in 'OLD'
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create trigger trg before insert on t2 for each row set @a:=1;
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ERROR 42S02: Table 'test.t2' doesn't exist
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create trigger trg before insert on t1 for each row set @a:=1;
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create trigger trg after insert on t1 for each row set @a:=1;
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ERROR HY000: Trigger already exists
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create trigger trg2 before insert on t1 for each row set @a:=1;
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ERROR HY000: Trigger already exists
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drop trigger t1.trg;
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drop trigger t1.trg;
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ERROR HY000: Trigger does not exist
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create view v1 as select * from t1;
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create trigger trg before insert on v1 for each row set @a:=1;
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ERROR HY000: Trigger's 'v1' is view or temporary table
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drop view v1;
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drop table t1;
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create temporary table t1 (i int);
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create trigger trg before insert on t1 for each row set @a:=1;
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ERROR HY000: Trigger's 't1' is view or temporary table
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drop table t1;
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create table t1 (x1col char);
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create trigger tx1 before insert on t1 for each row set new.x1col = 'x';
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insert into t1 values ('y');
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drop trigger t1.tx1;
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drop table t1;
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create table t1 (i int) engine=myisam;
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insert into t1 values (1), (2);
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create trigger trg1 before delete on t1 for each row set @del_before:= @del_before + old.i;
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create trigger trg2 after delete on t1 for each row set @del_after:= @del_after + old.i;
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set @del_before:=0, @del_after:= 0;
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delete from t1;
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select @del_before, @del_after;
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@del_before @del_after
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3 3
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drop trigger t1.trg1;
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drop trigger t1.trg2;
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drop table t1;
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