I'm trying to port some TSQL to PLPGSQL. The DB has a table with a
recursive foreign key that represents a tree hierarchy. I'm trying to
re-create a TSQL function that pulls out all the ancestors of a given
node in the hierarchy.
I'm rather new to PLSQL and I have several questions.
1. In TSQL, I can assign a scalar to the result of query like so: SET @var1 = (SELECT foo FROM bar WHERE
bar.uid=@var2)
How would I do this in PLSQL?
2. In TSQL the "result table" can be inserted into manually. IE:
CREATE FUNCTION foo () RETURNS @ttable TABLE( uid INTEGER) AS BEGIN INSERT @ttable VALUES (1)RETURN
END
Is there a way to manually insert rows into the result table in PLSQL?
What follows is my TSQL function if that helps give context.
CREATE FUNCTION svp_getparentproviderids (@child_provider INTEGER)
RETURNS @provider_ids TABLE ( uid INTEGER )
AS
BEGIN DECLARE @cid AS INTEGER IF (SELECT count(*) FROM providers WHERE uid =@child_provider) > 0 BEGINSET @cid =
@child_providerWHILE@cid IS NOT NULLBEGIN INSERT @provider_ids VALUES (@cid) SET @cid = (SELECT parent_id FROM
providersWHERE uid=@cid)END END RETURN
END
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