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<?php
/** FONCTIONS D'ASSEMBLAGE DE REQUETE
*
* @package eflore-projets
* @author Mathilde SALTHUN-LASSALLE <mathilde@tela-botanica.org>
* @author Delphine CAUQUIL <delphine@tela-botanica.org>
* @author Jean-Pascal MILCENT <jpm@tela-botanica.org>
* @license GPL v3 <http://www.gnu.org/licenses/gpl.txt>
* @license CECILL v2 <http://www.cecill.info/licences/Licence_CeCILL_V2-en.txt>
* @version 1.0
* @copyright 1999-2011 Tela Botanica (accueil@tela-botanica.org)
*/
class RequetesAssemblage {
private $table;
private $total_resultat;
private $Bdd;
private $condition;
public function __construct(BDD $bdd) {
$this->Bdd = $bdd;
}
public function getTotal_resultat() {
return $this->total_resultat;
}
public function retournerRequeteJointure($requete_jointure) {
$jointure = '';
if ($requete_jointure !== "") {
foreach ($requete_jointure as $req_j) {
$jointure .= ' '.$req_j['type'].' '.$req_j['table'].' ON '
.implode(' AND', $req_j['on']);
}
}
return $jointure;
}
public function assemblerLaRequete(Requete $requete_param) {
$this->table = $requete_param->table;
$requete_jointure = $this->retournerRequeteJointure($requete_param->requete_jointure);
$this->condition = $this->retournerRequeteCondition($requete_param->requete_condition);
$limites = $this->delimiterResultatsRequete($requete_param->limite_besoin, $requete_param->limite_requete);
$requete = ' SELECT '.$requete_param->champs_recherches.' FROM '.$requete_param->table.' '
.$requete_jointure .' '.$this->condition.' '.$limites;
return $requete;
}
public function retournerRequeteCondition($requete_condition) {
$condition = '';
if ($requete_condition !== "") {
$condition = ' WHERE '.implode(' AND ', $requete_condition);
}
return $condition;
}
public function calculerTotalResultat() {
$requete = 'SELECT count(*) as nombre FROM '.$this->table.' '.$this->condition;
$res = $this->Bdd->recuperer($requete);
if ($res) {
$this->total_resultat = $res['nombre'];
} else {
$this->total_resultat = 0;
$e = 'Données introuvables dans la base';
throw new Exception($e, RestServeur::HTTP_CODE_RESSOURCE_INTROUVABLE);
}
}
public function delimiterResultatsRequete($limite_besoin, $limite_requete) {
$this->calculerTotalResultat();
$requete_limite = '';
if ($limite_besoin) {
if (($limite_requete['depart'] < $this->total_resultat) &&
(($limite_requete['limite'] + $limite_requete['depart'] )
< $this->total_resultat )) {
$requete_limite = 'LIMIT '.$limite_requete['depart'].', '
.$limite_requete['limite'];
} else {
$e = "Erreur : la valeur pour le paramètre navigation.départ est supérieure".
" au nombre total de résultats.";
throw new Exception($e, RestServeur::HTTP_CODE_RESSOURCE_INTROUVABLE);
}
}
return $requete_limite;
}
}
?>