Frequently Asked Questions (FAQ) for PostgreSQL
- Last updated: Mon Jan 31 21:35:15 EST 2005
+ Last updated: Mon Jan 31 21:40:28 EST 2005
Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us)
uncertain how a cross-database query should even behave.
contrib/dblink allows cross-database queries using function calls. Of
- course, a client can make simultaneous connections to different
+ course, a client can also make simultaneous connections to different
databases and merge the results on the client side.
4.19) How do I return multiple rows or columns from a function?
- In 7.3, you can easily return multiple rows or columns from a
- function, http://techdocs.postgresql.org/guides/SetReturningFunctions.
+ It is easy using set-returning functions,
+ http://techdocs.postgresql.org/guides/SetReturningFunctions.
4.20) Why can't I reliably create/drop temporary tables in PL/PgSQL
functions?
- PL/PgSQL caches function contents, and an unfortunate side effect is
+ PL/PgSQL caches function scripts, 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
possible to use a third-party encrypted transport, such as stunnel
or ssh, rather than PostgreSQL's native SSL connections.)
* Database user passwords are automatically encrypted when stored in
- version 7.3. In previous versions, you must enable the option
- PASSWORD_ENCRYPTION in postgresql.conf.
+ the system tables.
* The server can run using an encrypted file system.
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alink="#0000ff">
<H1>Frequently Asked Questions (FAQ) for PostgreSQL</H1>
- <P>Last updated: Mon Jan 31 21:35:15 EST 2005</P>
+ <P>Last updated: Mon Jan 31 21:40:28 EST 2005</P>
<P>Current maintainer: Bruce Momjian (<A href=
"mailto:pgman@candle.pha.pa.us">pgman@candle.pha.pa.us</A>)
uncertain how a cross-database query should even behave.</P>
<P><I>contrib/dblink</I> allows cross-database queries using
- function calls. Of course, a client can make simultaneous
+ function calls. Of course, a client can also make simultaneous
connections to different databases and merge the results on the
client side.</P>
<H4><A name="4.19">4.19</A>) How do I return multiple rows or
columns from a function?</H4>
- <P>In 7.3, you can easily return multiple rows or columns from a
- function,
+ <P>It is easy using set-returning functions,
<a href="http://techdocs.postgresql.org/guides/SetReturningFunctions">
http://techdocs.postgresql.org/guides/SetReturningFunctions</a>.
<H4><A name="4.20">4.20</A>) Why can't I reliably create/drop
temporary tables in PL/PgSQL functions?</H4>
- <P>PL/PgSQL caches function contents, and an unfortunate side effect
+
+ <P>PL/PgSQL caches function scripts, 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
+ 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
<SMALL>EXECUTE</SMALL> for temporary table access in PL/PgSQL. This
will cause the query to be reparsed every time.</P>
encrypted transport, such as stunnel or ssh, rather than PostgreSQL's
native SSL connections.)
<LI>Database user passwords are automatically encrypted when stored in
- version 7.3. In previous versions, you must enable the option
- <I>PASSWORD_ENCRYPTION</I> in <I>postgresql.conf</I>.</LI>
+ the system tables.</LI>
<LI>The server can run using an encrypted file system.</LI>
</UL>
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