postgres trigger pass input to function
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I am trying to make a trigger that when a value is put into table1 it is then copied into table2. I have the following function which works correctly:
Create function func1(a integer) returns void
Language SQL as $$
insert into table2 values (a);$$;
and here is the trigger (it doesn't work):
Create trigger trig1
Before update on table1
For each row
Execute function func1(old.attr1)
I am trying to follow this documentation. Here is the part in particular I am following:
CREATE TRIGGER log_update
AFTER UPDATE ON accounts
FOR EACH ROW
WHEN (OLD.* IS DISTINCT FROM NEW.*)
EXECUTE PROCEDURE log_account_update();
I figured that old.attribute gives a particular attribute of the old row before it is changed. If I'm wrong on this let me know. Thanks
postgresql
asked Nov 15 '18 at 10:20
fredfred
459418
add a comment |
I am trying to make a trigger that when a value is put into table1 it is then copied into table2. I have the following function which works correctly:
Create function func1(a integer) returns void
Language SQL as $$
insert into table2 values (a);$$;
and here is the trigger (it doesn't work):
Create trigger trig1
Before update on table1
For each row
Execute function func1(old.attr1)
I am trying to follow this documentation. Here is the part in particular I am following:
CREATE TRIGGER log_update
AFTER UPDATE ON accounts
FOR EACH ROW
WHEN (OLD.* IS DISTINCT FROM NEW.*)
EXECUTE PROCEDURE log_account_update();
I figured that old.attribute gives a particular attribute of the old row before it is changed. If I'm wrong on this let me know. Thanks
postgresql
asked Nov 15 '18 at 10:20
fredfred
459418
add a comment |
I am trying to make a trigger that when a value is put into table1 it is then copied into table2. I have the following function which works correctly:
Create function func1(a integer) returns void
Language SQL as $$
insert into table2 values (a);$$;
and here is the trigger (it doesn't work):
Create trigger trig1
Before update on table1
For each row
Execute function func1(old.attr1)
I am trying to follow this documentation. Here is the part in particular I am following:
CREATE TRIGGER log_update
AFTER UPDATE ON accounts
FOR EACH ROW
WHEN (OLD.* IS DISTINCT FROM NEW.*)
EXECUTE PROCEDURE log_account_update();
I figured that old.attribute gives a particular attribute of the old row before it is changed. If I'm wrong on this let me know. Thanks
postgresql
asked Nov 15 '18 at 10:20
fredfred
459418
I am trying to make a trigger that when a value is put into table1 it is then copied into table2. I have the following function which works correctly:
Create function func1(a integer) returns void
Language SQL as $$
insert into table2 values (a);$$;
and here is the trigger (it doesn't work):
Create trigger trig1
Before update on table1
For each row
Execute function func1(old.attr1)
I am trying to follow this documentation. Here is the part in particular I am following:
CREATE TRIGGER log_update
AFTER UPDATE ON accounts
FOR EACH ROW
WHEN (OLD.* IS DISTINCT FROM NEW.*)
EXECUTE PROCEDURE log_account_update();
I figured that old.attribute gives a particular attribute of the old row before it is changed. If I'm wrong on this let me know. Thanks
postgresql
postgresql
asked Nov 15 '18 at 10:20
fredfred
459418
asked Nov 15 '18 at 10:20
fredfred
459418
asked Nov 15 '18 at 10:20
fredfred
459418
asked Nov 15 '18 at 10:20
fredfred
459418
asked Nov 15 '18 at 10:20
fredfred
459418
459418
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
The doc says this about the function that is called in the trigger:
A user-supplied function that is declared as taking no arguments and
returning type trigger, which is executed when the trigger fires.
This function has access to the OLD and NEW objects. You can modify your existing function:
Create function func1() RETURNS trigger
as $$
BEGIN
insert into table2 values (OLD.attr1);
RETURN NEW;
END;
$$ LANGUAGE plpgsql;
Create trigger trig1
Before update on table1
For each row
Execute function func1();
answered Nov 15 '18 at 13:11
JGHJGH
3,92941226
when I try to make the fuction func1 as you describe i get this error: "SQL functions cannot return type trigger"
– fred
Nov 15 '18 at 22:00
@fred ah yes, see edit
– JGH
Nov 16 '18 at 0:37
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
The doc says this about the function that is called in the trigger:
A user-supplied function that is declared as taking no arguments and
returning type trigger, which is executed when the trigger fires.
This function has access to the OLD and NEW objects. You can modify your existing function:
Create function func1() RETURNS trigger
as $$
BEGIN
insert into table2 values (OLD.attr1);
RETURN NEW;
END;
$$ LANGUAGE plpgsql;
Create trigger trig1
Before update on table1
For each row
Execute function func1();
answered Nov 15 '18 at 13:11
JGHJGH
3,92941226
when I try to make the fuction func1 as you describe i get this error: "SQL functions cannot return type trigger"
– fred
Nov 15 '18 at 22:00
@fred ah yes, see edit
– JGH
Nov 16 '18 at 0:37
add a comment |
The doc says this about the function that is called in the trigger:
A user-supplied function that is declared as taking no arguments and
returning type trigger, which is executed when the trigger fires.
This function has access to the OLD and NEW objects. You can modify your existing function:
Create function func1() RETURNS trigger
as $$
BEGIN
insert into table2 values (OLD.attr1);
RETURN NEW;
END;
$$ LANGUAGE plpgsql;
Create trigger trig1
Before update on table1
For each row
Execute function func1();
answered Nov 15 '18 at 13:11
JGHJGH
3,92941226
when I try to make the fuction func1 as you describe i get this error: "SQL functions cannot return type trigger"
– fred
Nov 15 '18 at 22:00
@fred ah yes, see edit
– JGH
Nov 16 '18 at 0:37
add a comment |
The doc says this about the function that is called in the trigger:
A user-supplied function that is declared as taking no arguments and
returning type trigger, which is executed when the trigger fires.
This function has access to the OLD and NEW objects. You can modify your existing function:
Create function func1() RETURNS trigger
as $$
BEGIN
insert into table2 values (OLD.attr1);
RETURN NEW;
END;
$$ LANGUAGE plpgsql;
Create trigger trig1
Before update on table1
For each row
Execute function func1();
answered Nov 15 '18 at 13:11
JGHJGH
3,92941226
The doc says this about the function that is called in the trigger:
A user-supplied function that is declared as taking no arguments and
returning type trigger, which is executed when the trigger fires.
This function has access to the OLD and NEW objects. You can modify your existing function:
Create function func1() RETURNS trigger
as $$
BEGIN
insert into table2 values (OLD.attr1);
RETURN NEW;
END;
$$ LANGUAGE plpgsql;
Create trigger trig1
Before update on table1
For each row
Execute function func1();
answered Nov 15 '18 at 13:11
JGHJGH
3,92941226
edited Nov 16 '18 at 0:36
answered Nov 15 '18 at 13:11
JGHJGH
3,92941226
answered Nov 15 '18 at 13:11
JGHJGH
3,92941226
answered Nov 15 '18 at 13:11
JGHJGH
3,92941226
3,92941226
when I try to make the fuction func1 as you describe i get this error: "SQL functions cannot return type trigger"
– fred
Nov 15 '18 at 22:00
@fred ah yes, see edit
– JGH
Nov 16 '18 at 0:37
add a comment |
when I try to make the fuction func1 as you describe i get this error: "SQL functions cannot return type trigger"
– fred
Nov 15 '18 at 22:00
@fred ah yes, see edit
– JGH
Nov 16 '18 at 0:37
when I try to make the fuction func1 as you describe i get this error: "SQL functions cannot return type trigger"
– fred
Nov 15 '18 at 22:00
when I try to make the fuction func1 as you describe i get this error: "SQL functions cannot return type trigger"
– fred
Nov 15 '18 at 22:00
@fred ah yes, see edit
– JGH
Nov 16 '18 at 0:37
@fred ah yes, see edit
– JGH
Nov 16 '18 at 0:37
add a comment |
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