奇怪的 PDO MySQL 问题
我正在尝试在 PHP 脚本中执行查询。该查询在我的 MySQL 客户端中运行良好，但在我的代码中似乎不起作用。我正在使用 PDO。我认为它可能有局限性，因为它似乎可以很好地处理不太复杂的查询。
这是查询：
SELECT D.status, D.createdBy, D.createDate, D.modifiedBy, D.modifiedDate,D.IPAddress, D.adminStatus, D.campus, D.buildingID, D.deviceShortName, D.distributionID, D.networkKey, D.deviceName, D.test, D.pkDevices, D.DNSRule, D.Domain, D.DNSOverride, D.noDNS, D.pkModel, DM.Model, DM.pkManufacturer, M.manufacturer FROM Devices AS D INNER JOIN DeviceModel AS DM ON D.pkModel = DM.pkModel INNER JOIN Manufacturer AS M ON DM.pkManufacturer = M.pkManufacturer WHERE D.status = '1' AND D.adminStatus = 'Active' ORDER BY D.deviceName
这是我尝试在脚本中调用它的位置：
$dbhDevices = newPDO('mysql:host='.$_SESSION['OpsDBServer'].'.ops.tns.its.psu.edu;dbname='.$_SESSION['OpsDB'], $_SESSION['yoM'], $_SESSION['aMa']);
$sqlDevices = "SELECT D.status, D.createdBy, D.createDate, D.modifiedBy,
D.modifiedDate, D.IPAddress, D.adminStatus, D.campus, D.buildingID,
D.deviceShortName, D.distributionID, D.networkKey, D.deviceName, D.test,
D.pkDevices, D.DNSRule, D.Domain, D.DNSOverride, D.noDNS, D.pkModel, DM.Model,
DM.pkManufacturer, M.manufacturer
FROM Devices AS D
INNER JOIN DeviceModel AS DM ON D.pkModel = DM.pkModel
INNER JOIN Manufacturer AS M ON DM.pkManufacturer = M.pkManufacturer
WHERE D.status = '1' AND D.adminStatus = 'Active' ORDER BY D.deviceName";
foreach ($dbhDevices->query($sqlDevices) as $rowDevices)
{
同样，该查询确实适用于 MySQL 客户端。
I am trying to perform a query in a PHP script. The query works fine in my MySQL client however it does not seem to working within my code. I am using PDO. I am thinking it might have limitations, because it seems to work fine with a less complicated query.
Here is the query:
SELECT D.status, D.createdBy, D.createDate, D.modifiedBy, D.modifiedDate,D.IPAddress, D.adminStatus, D.campus, D.buildingID, D.deviceShortName, D.distributionID, D.networkKey, D.deviceName, D.test, D.pkDevices, D.DNSRule, D.Domain, D.DNSOverride, D.noDNS, D.pkModel, DM.Model, DM.pkManufacturer, M.manufacturer FROM Devices AS D INNER JOIN DeviceModel AS DM ON D.pkModel = DM.pkModel INNER JOIN Manufacturer AS M ON DM.pkManufacturer = M.pkManufacturer WHERE D.status = '1' AND D.adminStatus = 'Active' ORDER BY D.deviceName
Here is where I am trying to call it in my script:
$dbhDevices = newPDO('mysql:host='.$_SESSION['OpsDBServer'].'.ops.tns.its.psu.edu;dbname='.$_SESSION['OpsDB'], $_SESSION['yoM'], $_SESSION['aMa']);
$sqlDevices = "SELECT D.status, D.createdBy, D.createDate, D.modifiedBy,
D.modifiedDate, D.IPAddress, D.adminStatus, D.campus, D.buildingID,
D.deviceShortName, D.distributionID, D.networkKey, D.deviceName, D.test,
D.pkDevices, D.DNSRule, D.Domain, D.DNSOverride, D.noDNS, D.pkModel, DM.Model,
DM.pkManufacturer, M.manufacturer
FROM Devices AS D
INNER JOIN DeviceModel AS DM ON D.pkModel = DM.pkModel
INNER JOIN Manufacturer AS M ON DM.pkManufacturer = M.pkManufacturer
WHERE D.status = '1' AND D.adminStatus = 'Active' ORDER BY D.deviceName";
foreach ($dbhDevices->query($sqlDevices) as $rowDevices)
{
Again, the query does work with the MySQL client.
如果你对这篇内容有疑问，欢迎到本站社区发帖提问 参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。
绑定邮箱获取回复消息
由于您还没有绑定你的真实邮箱，如果其他用户或者作者回复了您的评论，将不能在第一时间通知您！
发布评论
评论（3）
如果尚未启用，请尝试启用错误：
try enabling errors if haven't done already:
在旧版本的 PDO 使用中，当您出于某种原因声明 PDO 变量时，必须“初始化”它。尝试在通常初始化
$dbhDevices的代码之前添加一行，看看是否有效。我对此表示怀疑，因为您说它可以很好地处理不太复杂的查询，但值得一试。In the older versions of PDO usage you have to "initialize" your PDO variable when you declare it for some reason. Try putting a line before this code that generically initializes
$dbhDevicesand see if that does the trick. I have my doubts because you say it works fine with less complicated queries but it's worth a try.我通过使用 LEFT JOIN 而不是 INNER JOIN 使其工作。奇怪，但它正在工作。
I got it working by using a LEFT JOIN instead of an INNER JOIN. Strange, but it is working.