按周分页

Question

我正在使用以下代码将分页应用于我数据库中的一个大表。它工作正常但是我不知道如何在SELECT Query 中应用WHERE Week="?"（表中的52 周）和$start $limit 变量。这样，当我点击 PREVIOUS 或 NEXT 按钮时，它会转到该周的上一周或下一周的行。

<div id="content">
<?php
include("dbconfig.php");
$start=0;
$limit=10;

if(isset($_GET['id']))
{
    $id=$_GET['id'];
    $start=($id-1)*$limit;
}
else{
    $id=1;
}
//Fetch from database first 10 items which is its limit. For that when
page open you can see first 10 items. 
$query=mysqli_query($dbconfig,"select * from user LIMIT $start, $limit");
?>
<ul>
<?php
//print 10 items
while($result=mysqli_fetch_array($query))
{
    echo "<li>".$result['username']."</li>";
}
?>
</ul>
<?php
//fetch all the data from database.
$rows=mysqli_num_rows(mysqli_query($dbconfig,"select * from user"));
//calculate total page number for the given table in the database 
$total=ceil($rows/$limit);
if($id>1)
{
    //Go to previous page to show previous 10 items. If its in page 1 then it is inactive
    echo "<a href='?id=".($id-1)."' class='button'>PREVIOUS</a>";
}
if($id!=$total)
{
    ////Go to previous page to show next 10 items.
    echo "<a href='?id=".($id+1)."' class='button'>NEXT</a>";
}
?>
<ul class='page'>
<?php
//show all the page link with page number. When click on these numbers go     to particular page. 
        for($i=1;$i<=$total;$i++)
        {
            if($i==$id) { echo "<li class='current'>".$i."</li>"; }

            else { echo "<li><a href='?id=".$i."'>".$i."</a></li>"; }
        }
?>
</ul>
</div>

Answer 1

您可能会在几周内寻找一个选择框，然后在 where 子句中使用该值。

<select name="weeks">
    <?php 
        for( $i = 1; $i <= 52; $i++ ):
            echo '<option name="week" value="'.$i.'"></option>';
        endfor;
    ?>
</select>

查询：

$mysqli = dbConnect();
$stmt   = $mysqli->prepare( $sql );

if( !empty( $_POST['weeks'] ) ):
    $week = $_POST['week'];

    // Validate the data

    $week = trim( $week );
    $week = htmlspecialchars( $week );

    if( !ctype_digit( $week ) ):
        echo 'Week is not a valid input';
    else:
        // Prepared statement

        $sql = "SELECT * FROM user WHERE week = ? LIMIT ?, ?";
        $stmt->bind_param("iii", $week, $start, $limit);

    endif;

else:
    $sql = "SELECT * FROM user LIMIT ?, ?";
    $stmt->bind_param("ii", $start, $limit);
endif;

$stmt->execute();
$stmt->bind_result(yourparamshere);

$stmt->close();
$mysqli->close();

注意：

请看http://php.net/manual/en/pdo.prepared-statements.php

准备好的语句和存储过程更省钱，会让你成为更好的程序员。