使用分頁時，我是否需要使用mysql_free_result＆mysql_close？ PHP

我只是PHP編碼的新手。我目前正在研究一個帶分頁的簡單系統。我想知道在使用分頁時是否需要釋放收集的結果並關閉連接？使用分頁時，我是否需要使用mysql_free_result＆mysql_close？ PHP

在此先感謝！

下面的代碼：

<!DOCTYPE> 
<html> 
<head> 
    <title>View Records</title> 
    <link rel="stylesheet" type="text/css" href="css/style.css"> 
</head> 
<body> 
<?php 
    include("header.php"); 
    require('config.php'); 

    $tableName = "tracking_records"; 
    $targetpage = "view.php"; 
    $limit = 10; 

    $query = "SELECT COUNT(*) as num FROM $tableName"; 
    $total_pages = mysql_fetch_array(mysql_query($query)); 
    $total_pages = $total_pages['num']; 

    $stages = 10; 

    $getpage = (isset($_GET['page'])) ? (int)$_GET['page'] : 0; 
    $page = mysql_escape_string($getpage); 

    if($page){ 
     $start = ($page - 1) * $limit; 
    }else{ 
     $start = 0; 
    } 

    $query1 = "SELECT * FROM $tableName LIMIT $start, $limit"; 
    $result = mysql_query($query1) or die(mysql_error()); 

    if($page == 0){$page = 1;} 
    $prev = $page - 1; 
    $next = $page + 1;       
    $lastpage = ceil($total_pages/$limit);  
    $LastPagem1 = $lastpage - 1; 

    $paginate = ''; 
    if($lastpage > 1){ 
     $paginate .= "<div class='paginate'>"; 
     if($page > 1){ 
      $paginate.= "<a href='$targetpage?page=$prev'>previous</a>"; 
     }else{ 
      $paginate.= "<span class='disabled'>previous</span>"; 
     } 
     if($lastpage < 7 + ($stages * 2)){ 
      for($counter = 1; $counter <= $lastpage; $counter++){ 
       if($counter == $page){ 
        $paginate.= "<span class='current'>$counter</span>"; 
       }else{ 
        $paginate.= "<a href='$targetpage?page=$counter'>$counter</a>"; 
       }   
      } 
     } 
     elseif($lastpage > 5 + ($stages * 2)){ 
      if($page < 1 + ($stages * 2)){ 
       for($counter = 1; $counter < 4 + ($stages * 2); $counter++){ 
        if($counter == $page){ 
         $paginate.= "<span class='current'>$counter</span>"; 
        }else{ 
         $paginate.= "<a href='$targetpage?page=$counter'>$counter</a>"; 
        } 
       } 
       $paginate.= "..."; 
       $paginate.= "<a href='$targetpage?page=$LastPagem1'>$LastPagem1</a>"; 
       $paginate.= "<a href='$targetpage?page=$lastpage'>$lastpage</a>";  
      } 
      // Middle hide some front and some back 
      elseif($lastpage - ($stages * 2) > $page && $page > ($stages * 2)){ 
       $paginate.= "<a href='$targetpage?page=1'>1</a>"; 
       $paginate.= "<a href='$targetpage?page=2'>2</a>"; 
       $paginate.= "..."; 
       for($counter = $page - $stages; $counter <= $page + $stages; $counter++){ 
        if($counter == $page){ 
         $paginate.= "<span class='current'>$counter</span>"; 
        }else{ 
         $paginate.= "<a href='$targetpage?page=$counter'>$counter</a>"; 
        }     
       } 
       $paginate.= "..."; 
       $paginate.= "<a href='$targetpage?page=$LastPagem1'>$LastPagem1</a>"; 
       $paginate.= "<a href='$targetpage?page=$lastpage'>$lastpage</a>";  
      }else{ 
       $paginate.= "<a href='$targetpage?page=1'>1</a>"; 
       $paginate.= "<a href='$targetpage?page=2'>2</a>"; 
       $paginate.= "..."; 
       for($counter = $lastpage - (2 + ($stages * 2)); $counter <= $lastpage; $counter++){ 
        if($counter == $page){ 
         $paginate.= "<span class='current'>$counter</span>"; 
        }else{ 
         $paginate.= "<a href='$targetpage?page=$counter'>$counter</a>"; 
        }    
       } 
      } 
     } 
     if($page < $counter - 1){ 
      $paginate.= "<a href='$targetpage?page=$next'>next</a>"; 
     }else{ 
      $paginate.= "<span class='disabled'>next</span>"; 
     } 
     $paginate.= "</div>"; 
    } 
    echo '&nbsp;&nbsp;&nbsp;'.$total_pages.' Results'; 
    echo $paginate; 
?> 
<table border='1'> 
    <tr> 
     <th>Contract #</th><th>Date</th> 
     <th>Vessel</th><th>Work Description</th> 
     <th>Specs PKG</th><th>Period of Performance</th> 
     <th>Required Delivery Date</th><th>IGE Amount</th> 
     <th>PM/SBS/MM</th><th>IDIQ</th> 
     <th>Solicitation #</th><th>RFP/RFQ Closing Date</th> 
     <th>RFP/RFQ Closing Time</th><th>Status</th> 
     <th>Award Amount</th><th>Award Date</th> 
     <th>Contractor</th><th>Remarks</th> 
     <th>Edit/Delete</th> 
    </tr> 
<?php 
    while($row = mysql_fetch_array($result)) 
    { 
     echo "<tr> 
      <td>$row[0]</td><td>$row[1]</td> 
      <td>$row[2]</td><td>$row[3]</td> 
      <td>$row[4]</td><td>$row[5]</td> 
      <td>$row[6]</td><td>$row[7]</td> 
      <td>$row[8]</td><td>$row[9]</td> 
      <td>$row[10]</td><td>$row[11]</td> 
      <td>$row[12]</td><td>$row[13]</td> 
      <td>$row[14]</td><td>$row[15]</td> 
      <td>$row[16]</td><td>$row[17]</td> 
      <td> 
       <a href='edit.php?cn=$row[0]'>Edit</a><br /> 
       <a href='delete.php?cn=$row[0]' onClick=\"return confirm('Delete this record?')\";>Delete</a> 
      </td> 
     </tr>"; 
    } 
    echo "</table>"; 
    mysql_free_result($result); 
    mysql_close($connection); 
?> 
</body> 
</html>

來源

2016-06-28 technoken

沒有必要，那些任務在單個請求完成處理後自動執行。只有在實施持久性進程時才需要它們，如守護進程。在這種情況下，這種收集是不可能的，你必須自己照顧自由結果，以防止內存溢出。 – arkascha

@arkascha謝謝！ – technoken

記憶會一旦你的請求完成後自動被刪除。

來源

2016-06-28 08:33:42

使用分頁時，我是否需要使用mysql_free_result＆mysql_close？ PHP

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