PostgreSQL 9.3: Update tables contained in a view - postgresql

Question

I have a view which contains 3 tables. I want to update the each tables contained in the view.
Tables:
Table 1: test1
create table test1
(
id int,
name text,
city text
);
insert into test1 values(1,'Abc','xyz');
Table 2: test2
create table test2
(
id int,
name text,
city text
);
insert into test2 values(1,'bc','xz');
Table 3: test3
create table test3
(
id int,
name text,
city text
);
insert into test3 values(1,'Ac','yz');
View:
create view myview as select * from test1 union all select * from test2 union all select * from test3;
Note: I have a situation where I need to update the all tables city at once. So I have written a function
which does the update for a single table.
create or replace function updatefun(tablename text)
returns void as
$body$
Declare
query varchar;
Begin
query := 'Update '||tablename||'
set city = ''XXX''';
raise info '%',query;
execute query;
end;
$body$
Language plpgsql;
I have another table which contains the ViewId and ViewName.
create table viewdetails
(
ViewId int,
ViewName text
);
insert into viewdetails values(101,'myview');
Now I want to write another function to get all tables from the view and want to call the
function updatefun from this function to update all tables.
My try:
create or replace function fun1(vId int)
returns void as
$body$
declare
query varchar;
rec1 record;
rec2 record;
begin
DROP TABLE IF EXISTS temp_table1;
create temp table temp_table1(viewNames text);
query := 'insert into temp_table1 select ViewName from ViewDetails where ViewId = '|| vId ||'';
execute query;
for rec1 in select ViewNames from temp_table1 loop
for rec2 in SELECT Table_Name FROM INFORMATION_SCHEMA.VIEW_TABLE_USAGE WHERE View_Name = 'rec1' loop
select updatefun('rec2');
end loop;
end loop;
end;
$body$
language plpgsql;
Calling Function:
select fun1(101);
Checking view:
select * from myview;
Not getting why it is not getting updated??

Answer 1

This is incorrect:
select updatefun('rec2');
You want
perform updatefun(rec2);
without any quotes around rec2 otherwise it's interpreted as a literal, not the name of a variable.
Additionally rec2 should be of type TEXT, not RECORD.