Question

I’m having a problem with retrieving information from a MySQL Table with PHP.
I Have the following table in the MySQL database:

id | pigeon_sn | mother_sn | father_sn

id – represents the unique ID;
pigeon_sn – represents the pigeon ring serial number
mother_sn – represents the mother of the pigeon – ring serial number
father_sn – represents the father of the pigeon – ring serial number

I’d like to retrieve from the database the information as a pedigree like file.
This means I need to retrieve the information as follows:

I insert the serial number of the ring of a pigeon.
– it gives me the serial number of the mother and father ring.
– then, for each new serial number ( mother and father ) retrieves the father corresponding to the serial no obtained before, and the mother corresponding to the serial no before.
– the algorithm goes on for a given number of iterations ( For example 3 will retrieve 3 generations of pigeons by their mother and father serial number ).

I belive that this can be done recursively or just by an for algorithm that goes for a given number of iterations. For every pigeon ( pigeon is represented by the serial number obtained from the pigeon before ) the algorithm will create an associative array with all the information on that row table.

Thank you in advice.

Answer 1

Got this working up if somebody needs it:

First you get the first pigeon and their parents:

$pedigree[0] = $this->fetchRow(“pigeon_sn='{$sn}'”);

$pedigree[1][] = $this->fetchRow(“pigeon_sn='{$pedigree[0][‘SN_m’]}'”);

$pedigree[1][] = $this->fetchRow(“pigeon_sn='{$pedigree[0][‘SN_t’]}'”);

and after that you will go like this:

    public function recurseDB($last_level,&$result,$level=1,$limit=2){
        //Check if las level was an array
        if($level <= $limit){
            if(is_array($last_level)){   
                foreach($last_level as $array){
                    $result[$level+1][] = $this->fetchRow("pigeon_SN='{$array['SN_m']}'");
                    $result[$level+1][] = $this->fetchRow("pigeon_SN='{$array['SN_t']}'");
                }
                $this->recurseDB($result[$level+1],$result,$level+1,$limit);
            }
            else
            {
                $result[$level][] = $this->fetchRow("pigeon_SN='{$last_level['SN_m']}'");
                $result[$level][] = $this->fetchRow("pigeon_SN='{$last_level['SN_t']}'");
            }
        }
    } 

for the recursive funciton.