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