Specify dblink column definition list from a local existing type

Question

I am using dblink to move certain data between databases. Everything is save and sound but I am wondering if there is a more convenient way to define the column definition l

Answer 1

Try something like this :

select (rec).* from dblink('dbname=...','select myalias from foreign_table
  myalias') t1 (rec local_type)

Example (get tables stats from other database) :

select (rec).* from dblink('dbname=foreignDb','select t1 from
  pg_stat_all_tables t1') t2 (rec pg_stat_all_tables)

Answer 2

You might need to make sure that your types are always in sync but this should work:

SELECT (t1::test).* 
  FROM dblink('dbname=remote', 'select * from test') AS t1;

The key is that often you need parentheses to ensure that the parser knows you are dealing with tuples.

For example this works for me:

 CREATE TABLE test (id int, test bool);
 select (t1::test).* from (select 1, true) t1;

But this throws a syntax error:

 select t1::test.* from (select 1, true) t1;