Function pass1ExpandView

src/dsql/StmtNodes.cpp:10775–10820

Process a view update performed by a trigger.

// Process a view update performed by a trigger.
static StmtNode* pass1ExpandView(thread_db* tdbb, CompilerScratch* csb, StreamType orgStream,
	StreamType newStream, bool remap)
{
	SET_TDBB(tdbb);

	DEV_BLKCHK(csb, type_csb);

	StmtNodeStack stack;
	jrd_rel* relation = csb->csb_rpt[orgStream].csb_relation;
	vec<jrd_fld*>* fields = relation->rel_fields;

	dsc desc;
	USHORT id = 0, newId = 0;
	vec<jrd_fld*>::iterator ptr = fields->begin();

	for (const vec<jrd_fld*>::const_iterator end = fields->end(); ptr < end; ++ptr, ++id)
	{
		if (*ptr)
		{
			if (remap)
			{
				const jrd_fld* field = MET_get_field(relation, id);

				if (field->fld_source)
					newId = nodeAs<FieldNode>(field->fld_source)->fieldId;
				else
					newId = id;
			}
			else
				newId = id;

			const Format* const format = CMP_format(tdbb, csb, newStream);
			if (newId >= format->fmt_count || !format->fmt_desc[newId].dsc_address)
				continue;

			AssignmentNode* const assign =
				FB_NEW_POOL(*tdbb->getDefaultPool()) AssignmentNode(*tdbb->getDefaultPool());
			assign->asgnTo = PAR_gen_field(tdbb, newStream, newId);
			assign->asgnFrom = PAR_gen_field(tdbb, orgStream, id);

			stack.push(assign);
		}
	}

	return PAR_make_list(tdbb, stack);
}

// Check out a prospective update to a relation. If it fails security check, bounce it.
// If it's a view update, make sure the view is updatable, and return the view source for redirection.