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<TITLE>LOAD(SQL) manual page</TITLE>
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<A HREF="sql.html">SQL Reference Contents</A>
<H2><A NAME="sect0" HREF="#toc0">NAME </A></H2>
load - dynamically load an object file
<H2><A NAME="sect1" HREF="#toc1">SYNOPSIS </A></H2>
<B>load </B> "filename"
<BR>
<H2><A NAME="sect2" HREF="#toc2">DESCRIPTION </A></H2>
<B>Load</B> loads an object (or ".o") file into Postgres's address
space. Once a file is loaded, all functions in that file can be accessed.
This function is used in support of ADT's. <P>
If a file is not loaded using
the <B>load</B> command, the file will be loaded automatically the first time
the function is called by Postgres. <B>Load</B> can also be used to reload an
object file if it has been edited and recompiled. Only objects created
from C language files are supported at this time.
<H2><A NAME="sect3" HREF="#toc3">EXAMPLE </A></H2>
-- <BR>
--Load the file
/usr/postgres/demo/circle.o <BR>
-- <BR>
load "/usr/postgres/demo/circle.o" <BR>
<H2><A NAME="sect4" HREF="#toc4">CAVEATS
</A></H2>
Functions in loaded object files should not call functions in other object
files loaded through the <B>load</B> command, meaning, for example, that all
functions in file A should call each other, functions in the standard
or math libraries, or in Postgres itself. They should not call functions
defined in a different loaded file B. This is because if B is reloaded,
the Postgres loader is not `smart' enough to relocate the calls from the
functions in A into the new address space of B. If B is not reloaded,
however, there will not be a problem. <P>
On DECstations, you must use <I>/bin/cc</I>
with the `-G 0' option when compiling object files to be loaded. <P>
Note that
if you are porting Postgres to a new platform, the <B>load</B> command will have
to work in order to support ADTs. <P>
<HR><P>
<A NAME="toc"><B>Table of Contents</B></A><P>
<UL>
<LI><A NAME="toc0" HREF="#sect0">NAME</A></LI>
<LI><A NAME="toc1" HREF="#sect1">SYNOPSIS</A></LI>
<LI><A NAME="toc2" HREF="#sect2">DESCRIPTION</A></LI>
<LI><A NAME="toc3" HREF="#sect3">EXAMPLE</A></LI>
<LI><A NAME="toc4" HREF="#sect4">CAVEATS</A></LI>
</UL>
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