On 4/17/15 7:39 PM, David G. Johnston wrote:
On Friday, April 17, 2015, Jim Nasby <jim.na...@bluetreble.com
<mailto:jim.na...@bluetreble.com>> wrote:
I'm working on a function that will return a set of test data, for
unit testing database stuff. It does a few things, but ultimately
returns SETOF record that's essentially:
RETURN QUERY EXECUTE 'SELECT * FROM ' || table_name;
Because it's always going to return a real relation, I'd like to be
able to the equivalent of:
SELECT ... FROM my_function( 'some_table' )::some_table;
Unfortunately this means "cast the existing type to some_table" and
"record" is not a valid type in this context.
Is there any trick that would allow that to work? I know that
instead of 'SELECT * ...' I can do 'SELECT row(t.*) FROM ' ||
table_name || ' AS t' and then do
SELECT ... FROM my_function( 'some_table' ) AS data( d some_table )
but I'm hoping to avoid the extra level of indirection.
Haven't explored this specific code in depth...but which part - the
function alias or the select row(t.*)? They seem to be independent
concerns.
I'm saying that I know I can use the row construct as a poor
work-around. What I actually want though is a way to tell this query:
SELECT ... FROM my_function( 'some_table' )
that my_function is returning a record that exactly matches "my_table".
I suspect there's not actually any way to do that :(
--
Jim Nasby, Data Architect, Blue Treble Consulting
Data in Trouble? Get it in Treble! http://BlueTreble.com
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