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Add item for plpgsql temp table access.

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Bruce Momjian
2002-06-10 19:47:57 +00:00
parent 090319b20f
commit 9aac62305b
2 changed files with 39 additions and 15 deletions
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doc/FAQ
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@ -1,7 +1,7 @@
Frequently Asked Questions (FAQ) for PostgreSQL
Last updated: Fri Apr 26 23:03:46 EDT 2002
Last updated: Mon Jun 10 15:47:38 EDT 2002
Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us)
@ -92,6 +92,8 @@
4.23) How do I perform an outer join?
4.24) How do I perform queries using multiple databases?
4.25) How do I return multiple rows or columns from a function?
4.26) Why can't I reliably create/drop temporary tables in PL/PgSQL
functions?
Extending PostgreSQL
@ -1031,6 +1033,17 @@ SELECT *
http://developer.postgresql.org/docs/postgres/plpgsql-cursors.html,
section 23.7.3.3.
4.26) Why can't I reliably create/drop temporary tables in PL/PgSQL
functions?
PL/PgSQL caches function contents, and an unfortunate side effect is
that if a PL/PgSQL function accesses a temporary table, and that table
is later dropped and recreated, and the function called again, the
function will fail because the cached function contents still point to
the old temporary table. The solution is to use EXECUTE for temporary
table access in PL/PgSQL. This will cause the query to be reparsed
every time.
Extending PostgreSQL
5.1) I wrote a user-defined function. When I run it in psql, why does it