Function evlResetContext

src/jrd/SysFunction.cpp:4979–5028

dsc* evlResetContext(thread_db* tdbb, const SysFunction* function, const NestValueArray& args, impure_value* impure)
{
	fb_assert(args.getCount() == 1);

	Attachment* const attachment = tdbb->getAttachment();
	jrd_tra* const transaction = tdbb->getTransaction();
	Request* request = tdbb->getRequest();

	const dsc* nameSpace = EVL_expr(tdbb, request, args[0]);
	if (!nameSpace)	// Complain if namespace is null
		ERR_post(Arg::Gds(isc_ctx_bad_argument) << Arg::Str(RDB_RESET_CONTEXT));

	const string nameSpaceStr(MOV_make_string2(tdbb, nameSpace, ttype_none));

	StringMap* contextVars = nullptr;

	if (nameSpaceStr == USER_SESSION_NAMESPACE)
	{
		if (!attachment)
		{
			fb_assert(false);
			return nullptr;
		}

		contextVars = &attachment->att_context_vars;
	}
	else if (nameSpaceStr == USER_TRANSACTION_NAMESPACE)
	{
		if (!transaction)
		{
			fb_assert(false);
			return nullptr;
		}

		contextVars = &transaction->tra_context_vars;
	}
	else
	{
		// "Invalid namespace name %s passed to %s"
		ERR_post(Arg::Gds(isc_ctx_namespace_invalid) <<
			Arg::Str(nameSpaceStr) << Arg::Str(RDB_RESET_CONTEXT));
	}

	impure->vlu_desc.makeLong(0, &impure->vlu_misc.vlu_long);
	impure->vlu_misc.vlu_long = (SLONG) contextVars->count();

	contextVars->clear();

	return &impure->vlu_desc;
}


dsc* evlGetTranCN(thread_db* tdbb, const SysFunction* function, const NestValueArray& args,