Question

我创建一个php页面，我想如果数据发布然后查询为此运行我使用isset函数但不起作用我总是运行三个查询但我想一次运行一个查询我怎么做？这里是我的代码：

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;
            }

这是我的数组：

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 )

当我显示查询时，这里给出错误结果是我的查询

 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

Answer 1

在您的数组中，有fromdate和todate个索引。这就是为什么要执行3个代码块的原因。您只检查索引，还需要检查值。即，不是空的。还可以使用if..else。在这里你可以使用以下，

//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
}

Answer 2

例如，您可以在第一个上使用！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
}

如何一次运行一个查询？

2 个答案: