Question

我现在已经解决了我的查询问题，即使语法可能会起作用，我实现的分页也不会起作用。我已经尝试过每个程序员社区的每个建议，但它没有对结果做任何改变。请帮助我，因为这是我完成项目的最后要求。这是代码：

$fromDate = "2015-01-01";
$toDate = "2015-01-30";
$dept = "PACKING";
$user = "root";
$pass = "admin";
$host = "localhost";
$db = "tempdb";

try{
    $cxn = new PDO("mysql:host=$host;dbname=$db",$user,$pass);
    $cxn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
    $cxn->exec('SET NAMES "utf8"');
}
catch(PDOException $e){
    echo "Unable to connect to server" . $e->getMessage();
    exit();
}
try{
    if(isset($_POST['id'])  &&
    isset($_POST['empid'])  &&
    isset($_POST['employee'])   &&
    isset($_POST['department']))
    {
        $id = $_POST['id'];
        $empid = $_POST['empid'];
        $employee = $_POST['employee'];
        $department = $_POST['department'];
        if($_POST['submit']==0)
        {
            $query = $cxn->prepare("SELECT emptb.*, tempstore.* FROM (SELECT * FROM 
emptb WHERE id < '".$id."' Department = :dept ORDER BY id DESC LIMIT 1)emptb  
inner join tempstore 
on emptb.EmpID = tempstore.EmpID WHERE tempstore.ValidDate BETWEEN
DATE(:fromDate) AND DATE(:toDate)");
            $query->bindParam(':fromDate',$fromDate);
            $query->bindParam(':toDate',$toDate);
            $query->bindParam(':dept',$dept);
            $query->execute();
            $s = $query->fetch();
            extract($s);
            $id = $id;
            $empid = $EmpID;
            $employee = $Lastname . ", " . $Firstname;
            $department = $Department;
        }
        elseif($_POST['submit']==1)
        {
            $query = $cxn->prepare("SELECT emptb.*, tempstore.* FROM (SELECT * FROM 
emptb WHERE id > '".$id."' Department = :dept ORDER BY id ASC LIMIT 1)emptb
inner join tempstore 
on emptb.EmpID = tempstore.EmpID WHERE tempstore.ValidDate BETWEEN
DATE(:fromDate) AND DATE(:toDate)");
            $query->bindParam(':fromDate',$fromDate);
            $query->bindParam(':toDate',$toDate);
            $query->bindParam(':dept',$dept);
        $query->execute();
        $s = $query->fetch();
        extract($s);
        $id = $id;
        $empid = $EmpID;
        $employee = $Lastname . ", " . $Firstname;
        $department = $Department;
    }
}
else
{
    $query = $cxn->prepare("SELECT emptb.*, tempstore.* FROM (SELECT * FROM
emptb WHERE Department = :dept ORDER BY id ASC LIMIT 1)emptb inner join
tempstore 
on emptb.EmpID = tempstore.EmpID WHERE tempstore.ValidDate BETWEEN
DATE(:fromDate) AND DATE(:toDate)");
    $query->bindParam(':fromDate',$fromDate);
    $query->bindParam(':toDate',$toDate);
    $query->bindParam(':dept',$dept);
    $query->execute();
    $s = $query->fetch();
    extract($s);
    $id = $id;
    $empid = $EmpID;
    $employee = $Lastname . ", " . $Firstname;
    $department = $Department;
}   
}
catch(PDOException $e){
    echo "Unable to execute query " . $e->getMessage();
    exit();
}
echo "<form action='' method='post'><pre>
    ID<input type='text' readonly='readonly' value='$empid'>
    Employee<input type='text' readonly='readonly' value='$employee'>
    Department<input type='text' readonly='readonly' value='$department'>
    <button name='submit' value='0'>PREVIOUS</button> <button name='submit' 
value='1'>NEXT</button></pre></form>";

echo "<table><tr><th>Date</th><th>TimeIn</th><th>LunchOut</th>  
<th>LunchIn</th><th>Timeout</th></tr>";
while($r = $query->fetch())
{
extract($r);
if($TimeIn=="00:00:00"){
    $TimeIn="";
}
else{
    $TimeIn= date("g:i",strtotime($TimeIn)) . " " . "AM";
}

if($LunchOut=="00:00:00"){
    $LunchOut="";
}
else{
    $LunchOut= date("g:i",strtotime($LunchOut)) . " " . "nn";
}

if($LunchIn=="00:00:00"){
    $LunchIn="";
}
else{
    $LunchIn=date("g:i",strtotime($LunchIn)) . " " . "PM";
}

if($TimeOut=="00:00:00"){
    $TimeOut="";
}
else{
    $TimeOut= date("g:i",strtotime($TimeOut)) . " " . "PM";
}
echo "<tr>
    <td>$ValidDate</td>\n
    <td>$TimeIn</td>\n
    <td>$LunchOut</td>\n
    <td>$LunchIn</td>\n
    <td>$TimeOut</td>\n</tr>";
}
echo "</table>";

Answer 1

您需要先计算当前查询中的行数：

$numrows = $s->rowCount();

并且需要为每页的结果设置一个vaiable说$ resultsPerPage：

$resultsPerPage=10;

然后是您当前所在的页面：

$offset=$_REQUEST['offset'];

然后你需要运行以下代码：

    $limit=$resultsPerPage;
    $PHP_SELF=$_SERVER['PHP_SELF'];
    if($numrows >= 1) { 
           // determine if offset has been passed to script, or if offset has been tampered with.
            if (empty($offset) || ($offset < 0) || ($offset > $numrows)) {
                $offset=0;
            }
            // Determine if a "PREV" link is necessary - if so, add it to the links array
            if (($offset > 0) && ($offset <= $numrows)) { 
                $prevoffset = $offset - $limit;
                $link_array[] = "<a href=\"$PHP_SELF?offset=$prevoffset" . $addOn . "\">Prev</a> &nbsp; \n";
            }

            // Determine the total number of pages needing links
            $pages=intval($numrows/$limit);
            // $pages variable now contains integer number of pages needed, unless there is a remainder from division
            if ($numrows % $limit) {
                // There is a remainder, so add one page
                $pages++;
            }
        /*
            for ($i=1; $i<=$pages; $i++) { // loop thru
                $newoffset=$limit*($i-1);
                if ((intval($offset/$limit)) == (intval($i-1))) 
                {   $link_array[] = "[$i] &nbsp; \n"; }
                else {  
                    $link_array[] = "<a href=\"$PHP_SELF?offset=$newoffset" . $addOn . "\">$i</a> &nbsp; \n"; 
                }
            }
            */

        $start_page=intval($offset/$limit)-4;
        $end_page=intval($offset/$limit)+5;

        if($start_page<=0){
        $start_page=1;  

        }

        if($start_page<2){
        $end_page=10;  

        }

        if($end_page>$pages){
          $end_page=$pages;
        }



            for ($i=$start_page; $i<=$end_page; $i++) { // loop thru
                $newoffset=$limit*($i-1);

            if ((intval($offset/$limit)) == (intval($i-1))) 
                {   $link_array[] = "[$i] &nbsp; \n"; }
                else {  
                $link_array[] = "<a href=\"$PHP_SELF?offset=$newoffset" . $addOn . "\">$i</a> &nbsp; \n"; 
                }
            }

            // Determine if this is the last page.
            if (!(($offset/$limit)==$pages) && $pages!=1) {
                $newoffset=$offset+$limit;
                // if not last page give NEXT link
                if((($numrows - $offset) > $limit) && ($pages !=1) && ($offset < $numrows)){
                    $link_array[] = "<a href=\"$PHP_SELF?offset=$newoffset" . $addOn . "\">Next</a><br>\n";
                }
            }
        }else{
            ; // redirect to error page
        }

if ($resultsPerPage > 0  && count($link_array) > 1)
{   echo "Page: ";
    array_walk($link_array, 'printArray'); 
}

如何在php中添加分页

1 个答案: