将mysqli分页转换为准备好的语句分页 [英] Convert mysqli pagination to prepared statement pagination

问题描述

当前使用mysqli的工作代码如下.我想将其转换为准备好的语句.基本上有三个sql查询需要转换为准备好的语句.第一部分是我最难弄清要获取计数值的准备方法，而我最终设法弄清楚了这一点.

the current working code with mysqli is as below. I would like to convert it to prepared statements. there is basically three sql query need to convert to prepared statement. the first part is the hardest part for me to figure out the prepared way to get count value which i kinda managed to figure it out eventually.

<?php
// Script and tutorial written by Adam Khoury @ developphp.com
// Line by line explanation : youtube.com/watch?v=T2QFNu_mivw
include_once("storescripts/connect_to_mysqli.php");
// This first query is just to get the total count of rows
$sql2 = "SELECT COUNT(id) FROM products ";
$query2 = mysqli_query($myConnection, $sql2);
$row = mysqli_fetch_row($query2);
// Here we have the total row count
$rows = $row[0];
// This is the number of results we want displayed per page
$page_rows = 10;
// This tells us the page number of our last page
$last = ceil($rows/$page_rows);
// This makes sure $last cannot be less than 1
if($last < 1){
    $last = 1;
}
// Establish the $pagenum variable
$pagenum = 1;
// Get pagenum from URL vars if it is present, else it is = 1
if(isset($_GET['pn'])){
    $pagenum = preg_replace('#[^0-9]#', '', $_GET['pn']);
}
// This makes sure the page number isn't below 1, or more than our $last page
if ($pagenum < 1) { 
    $pagenum = 1; 
} else if ($pagenum > $last) { 
    $pagenum = $last; 
}
// This sets the range of rows to query for the chosen $pagenum
$limit = 'LIMIT ' .($pagenum - 1) * $page_rows .',' .$page_rows;
// This is your query again, it is for grabbing just one page worth of rows by applying $limit
$sql = "SELECT id,product_name, price FROM products ORDER BY product_name DESC $limit";
$query = mysqli_query($myConnection, $sql);
// This shows the user what page they are on, and the total number of pages
$textline1 = "Products (<b>$rows</b>)";
$textline2 = "Page <b>$pagenum</b> of <b>$last</b>";
// Establish the $paginationCtrls variable
$paginationCtrls = '';
// If there is more than 1 page worth of results
if($last != 1){
    /* First we check if we are on page one. If we are then we don't need a link to 
       the previous page or the first page so we do nothing. If we aren't then we
       generate links to the first page, and to the previous page. */
    if ($pagenum > 1) {
        $previous = $pagenum - 1;
        $paginationCtrls .= '<a href="'.$_SERVER['PHP_SELF'].'?pn='.$previous.'">Previous</a> &nbsp; &nbsp; ';
        // Render clickable number links that should appear on the left of the target page number
        for($i = $pagenum-4; $i < $pagenum; $i++){
            if($i > 0){
                $paginationCtrls .= '<a href="'.$_SERVER['PHP_SELF'].'?pn='.$i.'">'.$i.'</a> &nbsp; ';
            }
        }
    }
    // Render the target page number, but without it being a link
    $paginationCtrls .= ''.$pagenum.' &nbsp; ';
    // Render clickable number links that should appear on the right of the target page number
    for($i = $pagenum+1; $i <= $last; $i++){
        $paginationCtrls .= '<a href="'.$_SERVER['PHP_SELF'].'?pn='.$i.'">'.$i.'</a> &nbsp; ';
        if($i >= $pagenum+4){
            break;
        }
    }
    // This does the same as above, only checking if we are on the last page, and then generating the "Next"
    if ($pagenum != $last) {
        $next = $pagenum + 1;
        $paginationCtrls .= ' &nbsp; &nbsp; <a href="'.$_SERVER['PHP_SELF'].'?pn='.$next.'">Next</a> ';
    }
}


$dynamicList = '';
while($row = mysqli_fetch_array($query, MYSQLI_ASSOC)){
    $id = $row["id"];
    $product_name = $row["product_name"];
    $price = $row["price"];
    $dynamicList .= "
                <li><div class='product'>
                <a href='product.php?id=$id' class='info'>
                <span class='holder'>
                <img src='inventory_images/$id.jpg' alt='$product_name' />
                <span class='book-name'>$product_name</span>
                </a>
                 <a href='product.php?id=$id' class='buy-btn'>RM<span class='price'>$price</span></a>
                </div>
                </li>

              ";
}
// Close your database connection
mysqli_close($myConnection);
?>
<!DOCTYPE html>
<html>
<head>
<style type="text/css">
body{ font-family:"Trebuchet MS", Arial, Helvetica, sans-serif;}
div#pagination_controls{font-size:21px;}
div#pagination_controls > a{ color:#06F; }
div#pagination_controls > a:visited{ color:#06F; }
</style>
</head>
<body>
<div>
  <h2><?php echo $textline1; ?> Paged</h2>
  <p><?php echo $textline2; ?></p>
  <p><?php echo $dynamicList; ?></p>
  <div id="pagination_controls"><?php echo $paginationCtrls; ?></div>
</div>
</body>
</html>

在此先感谢您的帮助

推荐答案

$stmt=$myConnection->prepare('SELECT COUNT(id) FROM products');
// Don't use bind_result()...
// execute your statement
$stmt->execute();
// Get result set into a MySQLi result resource
$result = $stmt->bind_result($id);

// array to hold all rows
$rows = array();

// All results bound to output vars
while ($stmt->fetch()) {
  // Append an array containing your result vars onto the rowset array
  $rows[] = array(
    'id' => $id
  );
}
  $rows=$id;

第一部分.我想你知道了

for the first part. i think you have got it

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