LOAD
SQL - Language Statements
LOAD
Dynamically loads an object file
1998-09-24
LOAD 'filename'
1998-09-01
Inputs
filename
Object file for dynamic loading.
1998-09-24
Outputs
LOAD
Message returned on successful completion.
ERROR: LOAD: could not open file 'filename'
Message returned if the specified file is not found. The file must be visible
to the Postgres backend,
with the appropriate full path name specified, to avoid this message.
1998-09-24
Description
Loads an object (or ".o") file into the
Postgres backend address space. Once a
file is loaded, all functions in that file can be accessed. This
function is used in support of user-defined types and functions.
If a file is not loaded using
LOAD,
the file will be loaded automatically the first time the
function is called by Postgres.
LOAD
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.
1998-09-24
Notes
Functions in loaded object files should not call functions in other
object files loaded through the
LOAD
command. For example, 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 able 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.
Object files must be compiled to contain position independent code.
For example,
on DECstations you must use
/bin/cc
with the -G 0 option when compiling object files to be
loaded.
Note that if you are porting Postgres
to a new platform, LOAD
will have to work in order to support ADTs.
Usage
--Load the file /usr/postgres/demo/circle.o
--
LOAD '/usr/postgres/demo/circle.o'
Compatibility
1998-09-24
SQL92
There is no LOAD in SQL92.