Hello,
PostgreSQL allow only catch exception (elevel ERROR). SQL/PSM requires that
warnings are catchable too. Simply solution's is adding one callback to
error's processing of errors on level WARNING.
typedef struct WarningHandlerCallback
{
bool (*callback) (void *arg, ErrorData *edata);
void *arg;
} WarningHandlerCallback;
extern DLLIMPORT WarningHandlerCallback *warning_handler;
Callback function returns true if accept warning and process it. This
function is called from errfinish()
/*
* Emit the message to the right places. If warning_handler is
defined,
* try use warning_handler. Emit message only if handler don't
accept
* message (returns false). Warning handlers are used in PL/pgPSM
language.
*/
if (elevel == WARNING)
{
bool handled = false;
if (warning_handler)
handled =
(*warning_handler->callback)(warning_handler->arg,edata);
if (!handled)
EmitErrorReport();
}
else
EmitErrorReport();
It's propably usable only for SQL/PSM implementation, and it's one from two
necessery hacks to core for this PL (second is scrollable cursor's support).
But without this hook I cannot simply distribute plpgpsm.
Any comments?
Best regards
Pavel Stehule
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