"A. Kretschmer" <[EMAIL PROTECTED]> writes: > am Wed, dem 30.01.2008, um 11:35:51 +0100 mailte Jaroslav Sivy folgendes: >> Hello everyone, >> >> I have following problem: am using pl/sql functions to trigger some >> sql code and i need to pass ORDER_BY column name and ASC/DESC sorting >> order as an input parameters into that function and order the result >> based on these input parameters. >> >> The problem is, that the only way is to create query as "string" and >> then execute it as "string". > > Right. >> >> Is there any other way around how to avoid that "string query"?
If you're not concerned with the planner being able to find indexes to satisfy these orderings (ie, you don't mind always doing a sort) you could do something like: ORDER BY CASE ? WHEN 1 THEN name ASC WHEN 2 THEN name DESC WHEN 3 THEN height ASC WHEN 4 THEN height DESC ELSE id ASC END But to the planner this will be basically an opaque expression. It won't be able to use any indexes on these columns. Also, incidentally you might want to use text strings instead of integer labels. -- Gregory Stark EnterpriseDB http://www.enterprisedb.com Get trained by Bruce Momjian - ask me about EnterpriseDB's PostgreSQL training! ---------------------------(end of broadcast)--------------------------- TIP 9: In versions below 8.0, the planner will ignore your desire to choose an index scan if your joining column's datatypes do not match
