动态查询php / mysql

Question

I have some issues with a dynamic query:

    $cond = array();

    if (!empty($type_contrat)) {
        $cond[] = "job_offers.type_contrat = '$type_contrat'";
    }

    if (!empty($categorie_poste)) {
        $cond[] = "job_offers.cat_poste = '$categorie_poste'";
    }

    if (!empty($niveau_etudes)) {
        $cond[] = "job_offers.qualifications = '$niveau_etudes'";
    }

    if (!empty($experience)) {
        $cond[] = "job_offers.experience >= '$experience'";
    }       

    if (count($cond)) {

                $query = $mysqli->query('SELECT 
                job_offers.ref_org,
                job_offers.titre,
                job_offers.qualifications,
                job_offers.experience,
                job_offers.cat_poste,
                job_offers.type_contrat,
                job_offers.taux_occupation,
                job_offers.lieu_affectation,
                job_offers.pays,
                job_offers.url,
                job_offers.date_entered,
                job_offers.date_expire,
                organisations.ref_org,
                organisations.name_organisation
                FROM job_offers,organisations
                WHERE job_offers.ref_org = organisations.ref_org AND ');

                $query .=  implode(' AND ', $cond);
    }


    print_r($query);

--> result: prints only (linebreaks added for readability):

job_offers.type_contrat = '1' AND
job_offers.cat_poste = '3' AND
job_offers.qualifications = '2' AND
job_offers.experience >= '1'

and therefore no result.

Answer 1

You are trying to append a string to a mysqli-result object...

Check the returnvalue of the mysqli->result() function here .

Since someone is keen on removing this answer; here's your solution:

    $cond = array();

    if (!empty($type_contrat)) {
        $cond[] = "job_offers.type_contrat = '$type_contrat'";
    }

    if (!empty($categorie_poste)) {
        $cond[] = "job_offers.cat_poste = '$categorie_poste'";
    }

    if (!empty($niveau_etudes)) {
        $cond[] = "job_offers.qualifications = '$niveau_etudes'";
    }

    if (!empty($experience)) {
        $cond[] = "job_offers.experience >= '$experience'";
    }       

    if (count($cond)) {

                $query = $mysqli->query('SELECT 
                job_offers.ref_org,
                job_offers.titre,
                job_offers.qualifications,
                job_offers.experience,
                job_offers.cat_poste,
                job_offers.type_contrat,
                job_offers.taux_occupation,
                job_offers.lieu_affectation,
                job_offers.pays,
                job_offers.url,
                job_offers.date_entered,
                job_offers.date_expire,
                organisations.ref_org,
                organisations.name_organisation
                FROM job_offers,organisations
                WHERE job_offers.ref_org = organisations.ref_org AND '.implode(' AND ', $cond));
    }


    print_r($query);