我正在开发一个发票查看系统，我想在 iframe 中查看单个 PDF 发票。我不知道如何制作查看具有最新到期日期的单张发票的 SQL 脚本。
我正在使用 Zend Framework，数据库是 MySQL。
public function viewinvoiceemployeeAction()
{
/** Object variable. Example use: $logger->err("Some error"); */
$logger = Zend_Registry::get('LOGGER');
/** Object variable. Example use: $something = $config->database; */
$config = Zend_Registry::get('config');
/** Object variable. Example use: print $date->get(); */
$date = Zend_Registry::get('date');
/** Object variable. Example use: $stmt = $db->query($sql); */
$db = Zend_Registry::get('dbAdapter');
$request = $this->getRequest();
$id = (integer) $request->getParam('ostoreskontra_id');
$dateColumn = (string) date("Y-m-d", strtotime("NOW"));
//select * from yourTable where dateColumn = (select max(dateColumn) from yourTable)
$db->beginTransaction();
try {
$date = (string) date("Y-m-d", strtotime($db->fetchone("SELECT laskun_pvm FROM ostoreskontra WHERE laskunera_pvm = (SELECT MAX(".$db->quote($dateColumn, 'STRING').") FROM ostoreskontra);")));
$number = (integer) $db->fetchone("SELECT laskun_nro FROM ostoreskontra WHERE laskunera_pvm = (SELECT MAX(".$db->quote($dateColumn, 'STRING').") FROM ostoreskontra);");
$sublier = (string) str_replace(" ","+",$db->fetchone("SELECT toimittaja.nimi FROM ostoreskontra LEFT JOIN toimittaja ON ostoreskontra.toimittaja_id=toimittaja.toimittaja_id WHERE ostoreskontra.laskunera_pvm = (SELECT MAX(".$db->quote($id, 'STRING').") FROM ostoreskontra);"));
$file = (string) $date.'_'.$sublier.'_'.$number.'.pdf';
$db->commit();
$content = file_get_contents(APPLICATION_PATH."/uploads/ostolaskut/".$file);
if ($id==0) {
header('Content-Type: text/plain');
} else {
header('Content-Type: application/pdf');
header("Content-Length: " . strlen($content) );
//header('Content-Disposition: attachment; filename='.$file);
echo $content;
}
} catch (Exception $e) {
$db->rollBack();
//$success = array('success' => false, 'msg' => $e->getMessage());
echo $e->getMessage();
}
//print_r($name);
}