Jan
Craig Addleman wrote:
How do I use the pltcu unknown module to auto-load a return value from a select query? I'm trying to boost performance in our databases by
preloading certain frequently-used variables. Ultimately I'd like to auto-load prepared queries this way too.
I've figured out how to use pltcu to auto-load a global variable and access that variable by appending the following lines to unknown.pltcl:
global var1
set var1 abc
Then, in a pltcu procdure, I can access it:
create function get_var1() returns varchar as '
global var1
return $var1
' language 'pltcu';
(returns abc)
What I'd like to do is something like the following in unknown.pltcl:
global ret spi_exec "select col1 from tablename where col2 = ''xyz''"
set ret $col1
and return the global $ret in pltcu functions.
When I try use spi_exec in unknown.pltcu, I get an error when loading the module: New/updated unknown: too many nested calls to Tcl_EvalObj (infinite loop?) Abort
I've tried a few other variations, all without success. Any suggestions?
(I'm
using pltcu because I need a trigger function that can write to system files, and I don't think that can be done with plperl or plpython.
Performance
boosting through hardware upgrades is not a viable option because the
databases are on tablets running Linux with 245 MB ram and damnably limited battery life.)
Craig Addleman DBA
www.sharechive.com
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