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Asked: 2026-05-22T00:42:55+00:00

I spent 2 hours searching through the other few posts at Stack Overflow concerning

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I spent 2 hours searching through the other few posts at Stack Overflow concerning this issue and they seemed more complicated than what I needed. I attempted doing the __toString function but I don’t think I did it correctly.

I am trying to take the sql statement for $personid and convert it to a string so I can use it in the other sql methods. 

$personid = $this->db->query('SELECT person_id FROM person');

$fullname = $this->db->query("SELECT person_fname, person_lname FROM person
                          WHERE person_id = '".$personid."';");

$sport = $this->db->query("SELECT sport_name FROM person_sport_rel A1
                        INNER JOIN sport A2 ON A1.sport_id = A2.sport_id
                        WHERE person_Id = '".$personid."';");

Just as the other posts had the problem.. the error I receive is

Object of class CI_DB_mysql_result could not be converted to string

I tried adding the constructor and the __toString in the CI_DB_mysql_result class that was recommended on the PHP site but to no avail

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1 Answer

  1. Editorial Team

    You are probably returning a bunch of id’s when you’re running this query:

    $personidsQuery = $this->db->query('SELECT person_id FROM person');

    so when you want to re-use it in new queries this is probably more interesting:

    $sql = "SELECT person_fname, person_lname FROM person WHERE person_id = ?";
foreach ($personidsQuery->result() as $row)
{
    $namesQuery = $this->db->query($sql, array($row->person_id));
}

    The CI userguide is a good help in this : http://www.codeignitor.com/user_guide/database/

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