Public.setsnmpinterfacekeysonupdate (trigger function)

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CREATE OR REPLACE FUNCTION public.setsnmpinterfacekeysonupdate()

RETURNS trigger
LANGUAGE plpgsql

AS $function$ BEGIN

 --
 -- (Used for Trigger update with old style foreign key)
 -- This condition keeps snmpinterfaceid inSync with the composite foreign key of nodeid, ipaddr, ifindex
 -- This usually happens when a record is being updated by old JDBC code (non-Hibernate DAOs) and has changed
 -- one or more of the composite key values, the snmpInterfaceId needs to be updated
 --
 IF ((NEW.snmpInterfaceId = OLD.snmpInterfaceId OR (NEW.snmpInterfaceId IS NULL AND OLD.snmpInterfaceId IS NULL)) AND 
     (NEW.nodeId != OLD.nodeId OR NEW.ifIndex != OLD.ifIndex OR (NEW.ifIndex IS NULL AND OLD.ifIndex IS NOT NULL) OR (NEW.ifIndex IS NOT NULL AND OLD.ifIndex IS NULL)))
 THEN
   IF NEW.ifIndex IS NULL AND NEW.snmpInterfaceId IS NOT NULL
   THEN
      SELECT NULL INTO NEW.snmpInterfaceId;
   ELSIF NEW.ifIndex IS NOT NULL
   THEN
    SELECT snmpif.id INTO NEW.snmpInterfaceId
      FROM snmpinterface snmpif
      WHERE (snmpif.nodeid = NEW.nodeid AND snmpif.snmpIfIndex = NEW.ifIndex);
      
    IF NOT FOUND THEN
      RAISE EXCEPTION 'IpInterface Trigger Notice, Condition 3: No SnmpInterface found for... nodeid: % ifindex: %', NEW.nodeid, NEW.ifIndex;
    END IF;
   END IF;
    
 --
 -- (Used for Trigger update with new style foreign key)
 -- This condition keeps the composite foreign key of nodeid, ipaddr, ifindex inSync with the snmpinterfaceid
 -- This usually happens with the Hibernate DAOs decide to change the snmpinterfaceid represented
 -- by the ipinterface.
 --
 -- We dont match on the case where NEW.snmpInterfaceId IS NULL, because we use it in the WHERE clause.
 --
 ELSIF (NEW.snmpInterfaceId != OLD.snmpInterfaceId OR (NEW.snmpInterfaceId IS NOT NULL AND OLD.snmpInterfaceId IS NULL))
 THEN
    SELECT snmpif.nodeId, snmpif.snmpIfIndex INTO NEW.nodeId, NEW.ifIndex
      FROM snmpinterface snmpif
     WHERE (snmpif.id = NEW.snmpInterfaceId);
     
     IF NOT FOUND THEN
        RAISE EXCEPTION 'IpInterface Trigger Notice, Condition 4: No SnmpInterface found for snmpInterfaceId: %', NEW.snmpInterfaceId;
     END IF;
 END IF;

 RETURN NEW;

END; $function$ |- | Select | Table | public.snmpinterface