Question

请查看此代码以解决问题。

当我按名称或年龄搜索数据时，我会在页面的前10行中得到我的结果，但是当我移动到下一页以查看结果时，它会返回到所有结果。如何在没有删除我输入的名称或年龄的数据的情况下进入下一页或者我在其中搜索的页面。
当我搜索所有数据时，如果年龄为null，我的年龄有空列的问题没有出现我需要查看所有数据，如果它是否为空，我输入int类型为年龄

<table class="tab">
         <thead>
	<tr>
	<th colspan="5" class="table-title">
	<h3>Search</h3>
	</th>
	</tr>
    <form method="post" action="<?php echo $_SERVER['PHP_SELF']; ?>" id="searchform">
    <tr class="trr">
    <th class="thh">
    Full Name
    </th>
    <th class="thh">
    Age
    </th>
    </tr>
    </thead>
    <tbody>
    <tr class="trr">
    <td class="tdd">
      <input type="text" autocomplete="off" style="width:150px;" name="name">
      </td>
    <td class="tdd">
      <input type="text" autocomplete="off" style="width:50px;" name="age">
	</td>
    <td class="tdd">
	<input type="submit" name="submit" value="Search"> 
	</td>
    </tbody>
    </table>
    </form> 
    <br>
    </body>
<?php
	 if (!empty($_POST['name'])){
	   $name=$_POST['name']; 
	  }
	   if (!empty($_POST['age'])){
	    $age=$_POST['age']; 
	  }

$con=mysqli_connect("localhost","name","password","db");
$ch = 'SET CHARACTER SET utf8'; 
	mysqli_query($con,$ch);
if (mysqli_connect_errno())
{
    echo "Failed to connect to MySQL: " . mysqli_connect_error();
}

 $tbl_name="table";  //your table name
 // How many adjacent pages should be shown on each side?
 $adjacents = 3;
 
 /* 
    First get total number of rows in data table. 
    If you have a WHERE clause in your query, make sure you mirror it here.
 */

$resul = mysqli_query($con,"SELECT ID,full_name,age FROM arrested WHERE
									 full_name LIKE '%$name%' AND
									 age LIKE '%$age%'");

$num_rows = mysqli_num_rows($resul);
 $total_pages =$num_rows;

/* Setup vars for query. */
 $targetpage = "detainees.php";  //your file name  (the name of this file)
 $limit = 10; 
   //how many items to show per page
 if(isset($_GET['page']))
{$page = $_GET['page'];}
else{$page =0;}
 if($page) 
  $start = ($page - 1) * $limit;    //first item to display on this page
 else
  $start = 0;        //if no page var is given, set start to 0
 
 /* Setup page vars for display. */
 if ($page == 0) $page = 1;     //if no page var is given, default to 1.
 $prev = $page - 1;       //previous page is page - 1
 $next = $page + 1;       //next page is page + 1
 $lastpage = ceil($total_pages/$limit);  //lastpage is = total pages / items per page, rounded up.
 $lpm1 = $lastpage - 1;      //last page minus 1
 
 /* 
  Now we apply our rules and draw the pagination object. 
  We're actually saving the code to a variable in case we want to draw it more than once.
 */
 $pagination = "";
 if($lastpage > 1)
 { 
  $pagination .= "<div class=\"pagination\">";
  //previous button
  if ($page > 1) 
   $pagination.= "<a href=\"$targetpage?page=$prev\">Previous</a>";
  else
   $pagination.= "<span class=\"disabled\">Previous</span>"; 
  
  //pages 
  if ($lastpage < 7 + ($adjacents * 2)) //not enough pages to bother breaking it up
  { 
   for ($counter = 1; $counter <= $lastpage; $counter++)

   {
    if ($counter == $page)
     $pagination.= "<span class=\"current\">$counter</span>";
    else
     $pagination.= "<a href=\"$targetpage?page=$counter\">$counter</a>";     
   }
  }
  elseif($lastpage > 5 + ($adjacents * 2)) //enough pages to hide some
  {
   //close to beginning; only hide later pages
   if($page < 1 + ($adjacents * 2))  
   {
    for ($counter = 1; $counter < 4 + ($adjacents * 2); $counter++)
    {
     if ($counter == $page)
      $pagination.= "<span class=\"current\">$counter</span>";
     else
      $pagination.= "<a href=\"$targetpage?page=$counter\">$counter</a>";     
    }
    $pagination.= "<b class='dot'> . . . </b>";
    $pagination.= "<a href=\"$targetpage?page=$lpm1\">$lpm1</a>";
    $pagination.= "<a href=\"$targetpage?page=$lastpage\">$lastpage</a>";  
   }
   //in middle; hide some front and some back
   elseif($lastpage - ($adjacents * 2) > $page && $page > ($adjacents * 2))
   {
    $pagination.= "<a href=\"$targetpage?page=1\">1</a>";
    $pagination.= "<a href=\"$targetpage?page=2\">2</a>";
    $pagination.= "<b class='dot'> . . . </b>";
    for ($counter = $page - $adjacents; $counter <= $page + $adjacents; $counter++)
    {
     if ($counter == $page)
      $pagination.= "<span class=\"current\">$counter</span>";
     else
      $pagination.= "<a href=\"$targetpage?page=$counter\">$counter</a>";     
    }
    $pagination.= "<b class='dot'> . . . </b>";
    $pagination.= "<a href=\"$targetpage?page=$lpm1\">$lpm1</a>";
    $pagination.= "<a href=\"$targetpage?page=$lastpage\">$lastpage</a>";  
   }
   //close to end; only hide early pages
   else
   {
    $pagination.= "<a href=\"$targetpage?page=1\">1</a>";
    $pagination.= "<a href=\"$targetpage?page=2\">2</a>";
    $pagination.= "<b class='dot'> . . . </b>";
    for ($counter = $lastpage - (2 + ($adjacents * 2)); $counter <= $lastpage; $counter++)
    {
     if ($counter == $page)
      $pagination.= "<span class=\"current\">$counter</span>";
     else
      $pagination.= "<a href=\"$targetpage?page=$counter\">$counter</a>";     
    }
   }
  }
  
  //next button
  if ($page < $counter - 1) 
   $pagination.= "<a href=\"$targetpage?page=$next\">Next</a>";
  else
   $pagination.= "<span class=\"disabled\">Next</span>";
  $pagination.= "</div>\n";  
 }

 /* Get data. */
$resul = mysqli_query($con,"SELECT ID,full_name,age FROM arrested WHERE
															 full_name LIKE '%$name%' AND
															 age LIKE '%$age%'
															 ORDER BY ID ASC LIMIT $start, $limit");
 
echo'<table class="table-fill">';
	echo'<thead><tr class="data">
<th class="text-left">ID</th>
<th class="text-left">Full Name</th>
<th class="text-left">Age</th>
</tr></thead>
<tbody class="table-hover">';
while($x= mysqli_fetch_object($resul))
	{

	echo '<tr class="data">';
  	echo '<td class="data">';
	echo $x->ID;
	echo "</td>"; 
  	echo '<td class="data">';
	echo $x->full_name;
	echo "</td>";
  	echo '<td class="data">';
	echo $x->status;
	echo "</td>"; 
	
  	echo "</tr>";
		}
		print "</table>";
mysqli_close($con);
?>
<?=$pagination ?>

Answer 1

使用会话（$ _SESSION），如下例所示：

<?php
session_start();

if (isset($_POST['var']) && !empty($_POST['var']))
{
    $var = $_POST['var'];
    $_SESSION['var'] = $var;
}
elseif (isset($_SESSION['var']))
{
    $var = $_SESSION['var'];
}
?>

$ _SESSION中设置的变量将一直保留到会话结束（通常是在浏览器关闭时）。

搜索数据并在Field中保存数据

1 个答案: