Question

我尝试使用分页功能每页显示3个项目。但是我收到了这个错误

Fatal error: Call to a member function bindParam() on boolean in C:\xampp\htdocs\cms\admin2\pagination.php on line 60

我已经搜索了解决方案，他们说主要是导致错误的查询问题，但我的sql查询并不太复杂，使用的语法是正确的，但我不确定为什么错误仍然出现。

这是我的分页代码：

<?php
include "dbConnection.php";

global $dbLink;
try {

    // Find out how many items are in the table
    $total = $dbLink->query('
        SELECT
            COUNT(*)
        FROM
            sponsor_item
    ')->fetch_row()[0];

    // How many items to list per page
    $limit = 3;

    // How many pages will there be
    $pages = ceil($total / $limit);

    // What page are we currently on?
    $page = min($pages, filter_input(INPUT_GET, 'page', FILTER_VALIDATE_INT, array(
        'options' => array(
            'default'   => 1,
            'min_range' => 1,
        ),
    )));

    // Calculate the offset for the query
    $offset = ($page - 1)  * $limit;

    // Some information to display to the user
    $start = $offset + 1;
    $end = min(($offset + $limit), $total);

    // The "back" link
    $prevlink = ($page > 1) ? '<a href="?page=1" title="First page">&laquo;</a> <a href="?page=' . ($page - 1) . '" title="Previous page">&lsaquo;</a>' : '<span class="disabled">&laquo;</span> <span class="disabled">&lsaquo;</span>';

    // The "forward" link
    $nextlink = ($page < $pages) ? '<a href="?page=' . ($page + 1) . '" title="Next page">&rsaquo;</a> <a href="?page=' . $pages . '" title="Last page">&raquo;</a>' : '<span class="disabled">&rsaquo;</span> <span class="disabled">&raquo;</span>';

    // Display the paging information
    echo '<div id="paging"><p>', $prevlink, ' Page ', $page, ' of ', $pages, ' pages, displaying ', $start, '-', $end, ' of ', $total, ' results ', $nextlink, ' </p></div>';

    // Prepare the paged query
    $stmt = $dbLink->prepare('
        SELECT
            (*)
        FROM
            sponsor_item
        ORDER BY
            sponsor_item_id
        LIMIT
            :limit
        OFFSET
            :offset
    ');

    // Bind the query params
    $stmt->bindParam(':limit', $limit, PDO::PARAM_INT);
    $stmt->bindParam(':offset', $offset, PDO::PARAM_INT);
    $stmt->execute();

    // Do we have any results?
    if ($stmt->rowCount() > 0) {
        // Define how we want to fetch the results
        $stmt->setFetchMode(PDO::FETCH_ASSOC);
        $iterator = new IteratorIterator($stmt);

        // Display the results
        foreach ($iterator as $row) {
            echo '<p>', $row['sponsor_item_id'], '</p>';
        }

    } else {
        echo '<p>No results could be displayed.</p>';
    }

} catch (Exception $e) {
    echo '<p>', $e->getMessage(), '</p>';
}
?>

在分页页面上我做错了什么？请指出我的错误。感谢

Answer 1

请确保您的查询中有拼写错误，(*)子句中的SELECT应为*。

Answer 2

$ stmt是一个布尔值，因为prepare（）失败了。所以你需要习惯使用防御性编码实践。

// Prepare the paged query
$stmt = $dbLink->prepare('
    SELECT
        (*)
    FROM
        sponsor_item
    ORDER BY
        sponsor_item_id
    LIMIT
        :limit
    OFFSET
        :offset
');

if($stmt === false){
    // handle the error here 
}

绑定值时PHP分页收到错误

2 个答案: