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Current File : /data/web/virtuals/51568/virtual/www/www/ucebnice/zapujcka-vratit.php

<?php
if (session_id() == '') { session_start(); }
 $user_id = $_SESSION["user_id"];
if (!isset($pdo)){
  if (file_exists("class/pdoDB.class.php")) {require "class/pdoDB.class.php";}
  else {require "../../class/pdoDB.class.php";}
 $pdo = new pdoDB();
}
$idzapujcky = (isset($_POST["idzapujcky"])) ? $_POST["idzapujcky"] : 0;
$idkniha  = (isset($_POST["idkniha"])) ? $_POST["idkniha"] : 0;
$pocet = (isset($_POST["pocet"])) ? $_POST["pocet"] : 0;
$datum = (isset($_POST["datum"])) ? $_POST["datum"] : '1970-01-01';

  $sql = "INSERT INTO `skl_vraceni`(`idzapujcky`, `datumvraceni`, `pocetvraceno`, `iduser`) 
    VALUES (:idzapujcky, :datumvraceni, :pocetvraceno, :iduser)";
  $pdo->execute($sql, Array(':idzapujcky' => $idzapujcky, ':datumvraceni' => $datum, ':pocetvraceno' => $pocet, ':iduser' => $user_id));

  $sql="SELECT sum(skl_zapujcky.`pocet`) as zapujceno FROM `skl_zapujcky` WHERE skl_zapujcky.idkniha = :idkniha";
  $celkem = $pdo->queryOne($sql, Array(':idkniha' => $idkniha));
  $zapujceno = ((empty($celkem->zapujceno)) ? 0 : $celkem->zapujceno);
  
  $sql = "SELECT sum(skl_vraceni.pocetvraceno) as vraceno FROM skl_vraceni 
  WHERE skl_vraceni.idzapujcky = :idzapujcky";
  $celkem = $pdo->queryOne($sql, Array(':idzapujcky' => $idzapujcky));
  $vraceno = ((empty($celkem->vraceno)) ? 0 : $celkem->vraceno); 
  
  $sql = "update skl_zapujcky set vraceno = :vraceno where id = :idzapujcky";
  $pdo->execute($sql, Array(':idzapujcky' => $idzapujcky, ':vraceno' => $vraceno));   

  $sql = "SELECT sum(skl_vraceni.pocetvraceno) as vraceno FROM skl_vraceni 
  left join `skl_zapujcky` on skl_zapujcky.id=skl_vraceni.idzapujcky WHERE skl_zapujcky.idkniha = :idkniha";
  $celkem = $pdo->queryOne($sql, Array(':idkniha' => $idkniha));
  $vraceno = ((empty($celkem->vraceno)) ? 0 : $celkem->vraceno);
  
  echo $zapujceno-$vraceno;

?>