查询结果有问题。 getSales()
函数在第一次调用时效果很好。再次调用时,查询不会产生任何结果。这是一小段代码:
abstract class Reporting {
protected function connect() {
try {
$this->dbh = PDOConnection::getInstance();
if (!$this->dbh instanceof PDO) {
throw new CustomException('Unable to connect to database');
}
}
catch (CustomException $e) {
echo $e;
}
}
}
class TenMinuteSales extends Reporting {
protected $date;
public function __construct($date) {
$this->date = new DateTime($date);
$this->date = $this->date->format('Y-m-d');
}
public function beginReport() {
parent::connect();
}
public function getSales($meridiem, $date) {
try {
$statement = "SELECT directory.location, IFNULL(sales.daily_sales,0.00) AS sales, IFNULL(sales.cover_counts,0) AS covers
FROM t_directory directory
LEFT JOIN v_sales_all sales
ON sales.site_id = directory.site_id
AND sales.business_date = :date
AND sales.meridiem = :meridiem
ORDER BY directory.site_id ASC
LIMIT :totalLocations";
$sth = $this->dbh->prepare($statement);
$sth->bindParam(':date', $date, PDO::PARAM_STR);
$sth->bindParam(':meridiem', $meridiem, PDO::PARAM_STR);
$sth->bindParam(':totalLocations', $this->totalLocations, PDO::PARAM_INT);
$sth->execute();
switch ($meridiem) {
case 'AM':
$this->amSales = $sth->fetchAll(PDO::FETCH_ASSOC);
return $this->amSales;
case 'PM':
$this->pmSales = $sth->fetchAll(PDO::FETCH_ASSOC);
return $this->pmSales;
}
}
catch (CustomException $e) {
echo $e;
}
}
$tms = new TenMinuteSales($date);
$tms->beginReport();
$amSales = $tms->getSales('AM', $date);
$pmSales = $tms->getSales('PM', $date);
当我为AM或PM销售号码呼叫getSales()
时,该功能成功返回数据。当我第二次调用它时,该函数不会返回任何数据。不确定我是否需要释放结果或其他内容。我尝试了unset($sth)
和$sth->closeCursor()
,但似乎都没有解决我的问题。任何帮助修复我的问题将不胜感激。如果需要更多详细信息,请与我们联系。
答案 0 :(得分:1)
由于这不是整个代码,因此请务必注意->bindParam
通过引用对变量起作用,如果您没有非常密切关注,可能会导致意外行为以后发生在那些变量上的所有事情。如果您没有明确需要引用,则使用->bindValue
(正如名称所示,按值绑定变量)更安全,更容易,而且最重要的是更清晰。显然这可以在这里工作,但确切为什么很难说没有完整的代码;)