如何一次運行一個查詢？

我做了一個PHP頁面，我想如果數據發佈然後查詢運行這個我使用isset函數，但沒有爲我工作它總是運行三個查詢，但我想一次運行一個查詢我是如何做到這一點？這是我的代碼：如何一次運行一個查詢？

if(isset($_POST['fromdate'])){ 
       $fromdate=date('Y-m-d h:i:s',strtotime($_POST['fromdate'])); 
     echo $select="select b.email AS Email from buyers b,registrations r where b.buyer_id=r.buyer_id and r.event_id='".$_POST['events'][$i]."' and b.created_on>='".$fromdate."' group by r.buyer_id"; 
$res = $GLOBALS ['mysqli']->query ($select) or die ($GLOBALS ['mysqli']->error . __LINE__); 
$record=mysqli_num_rows($res); 
    $recepients = $recepients + $record;      
} 
if(isset($_POST['todate'])){ 
$todate=date('Y-m-d h:i:s',strtotime($_POST['todate'])); 
echo $select1="select b.email AS Email from buyers b,registrations r where b.buyer_id=r.buyer_id and r.event_id='".$_POST['events'][$i]."' and b.created_on>='".$todate."' group by r.buyer_id"; 
$res1 = $GLOBALS ['mysqli']->query ($select1) or die ($GLOBALS ['mysqli']->error . __LINE__); 
       $record1=mysqli_num_rows($res1); 
       $recepients = $recepients + $record1; 
      } 
      if(isset($_POST['fromdate']) && isset($_POST['todate'])){ 
      $fromdate=date('Y-m-d h:i:s',strtotime($_POST['fromdate'])); 
      $todate=date('Y-m-d h:i:s',strtotime($_POST['todate'])); 
       echo $select2="select b.email AS Email from buyers b,registrations r where b.buyer_id=r.buyer_id and r.event_id='".$_POST['events'][$i]."' and b.created_on BETWEEN '".$fromdate."' AND '".$todate."' group by r.buyer_id"; 
$res2 = $GLOBALS ['mysqli']->query ($select2) or die ($GLOBALS ['mysqli']->error . __LINE__); 
       $record2=mysqli_num_rows($res2); 
       $recepients = $recepients + $record2; 
      }

，這裏是我的數組：

Array ([events] => Array ([0] => 7) [fromdate] => [todate] => February 11, 2014 2:55 PM [description] => [subject] => [fromname] => [replyto] => [senddatetime] => [timezone] => America/Los_Angeles [message] => [submit_skip] => Continue)

，當我顯示的查詢然後給壞的結果，這裏是我的查詢

select b.email AS Email from buyers b,registrations r where b.buyer_id=r.buyer_id and r.event_id='7' and b.created_on>='1970-01-01 12:00:00' group by r.buyer_id 
select b.email AS Email from buyers b,registrations r where b.buyer_id=r.buyer_id and r.event_id='7' and b.created_on>='2014-02-11 02:55:00' group by r.buyer_id 
select b.email AS Email from buyers b,registrations r where b.buyer_id=r.buyer_id and r.event_id='7' and b.created_on BETWEEN '1970-01-01 12:00:00' AND '2014-02-11 02:55:00' group by r.buyer_id

來源

2014-02-11 Arsal Ali

使用，這是在如果ELSEIF，否則結構 – Jain

另外，你的代碼是相當密集的 - 想想打破它顯著 - 也，使用$ GLOBALS是非常不尋常的，並使用$ _POST變量直接在SQL中=你會被黑客入侵。 –

在你的數組中有fromdate和todate索引。這就是爲什麼3個代碼塊被執行。你只是檢查索引，你還需要檢查值。即，不爲空。也可以使用if..else。在這裏，您可以使用下面，

//if both fromdate and todate are not null 
if(isset($_POST['fromdate']) and $_POST['fromdate']!='' and isset($_POST['todate']) and $_POST['todate']!=''){ 
    //code 
} 
//if fromdate is not null 
else if(isset($_POST['fromdate']) and $_POST['fromdate']!=''){ 
    //code 
} 
//if todate is not null 
else if(isset($_POST['todate']) and $_POST['todate']!=''){ 
    //code 
}

來源

2014-02-11 10:12:25

幽祕例如，在第一個例子中使用ght use！isset（$ _ POST ['todate']）。

if(isset($_POST['fromdate']) && !isset($_POST['todate']){ 
    // code 
} 
if(isset($_POST['todate']) && !isset($_POST['fromdate']){ 
    // code 
} 
if(isset($_POST['fromdate']) && isset($_POST['todate'])){ 
    // code 
}

來源

2014-02-11 10:11:46

如何一次運行一個查詢？

回答

相關問題