Value PostgreSQLConnection::GetInsertedId() const
{
	String pk = session.pkache.Get(last_insert_table, Null);
	if(IsNull(pk)) {
		String sqlc_expr; 
		sqlc_expr <<
		"SELECT " <<
		  "pg_attribute.attname " <<
		"FROM pg_index, pg_class, pg_attribute " <<
		"WHERE " <<
		  "pg_class.oid = '" << last_insert_table << "'::regclass AND "
		  "indrelid = pg_class.oid AND "
		  "pg_attribute.attrelid = pg_class.oid AND "
		  "pg_attribute.attnum = any(pg_index.indkey) "
		  "AND indisprimary";
		Sql sqlc( sqlc_expr );
		pk = sqlc.Execute() && sqlc.Fetch() ? sqlc[0] : "ID";
		session.pkache.Add(last_insert_table, pk);
	}
	Sql sql("select currval('" + last_insert_table + "_" + pk +"_seq')", session);
	if(sql.Execute() && sql.Fetch())
		return sql[0];
	else
		return Null;
}