Question

这是我遇到问题的代码。我在返回数组中有所有数据但是当我把它们分页时有问题。

在分页中，如果我每页有10个项目，然后我按下它然后显示第一页的第二行而不是跳过前10个记录

插件链接如下

https://mac-blog.org.ua/wordpress-custom-database-table-example-full/

function prepare_items()
{
    global $wpdb;
    $table_name     = $wpdb->prefix . 'cte'; // do not forget about tables prefix
    $per_page       = 10; // constant, how much records will be shown per page


    $paged = isset($_REQUEST['paged']) ? max(0, intval($_REQUEST['paged']) - 1) : 0;


    $current_page   = $this->get_pagenum();
    $columns        = $this->get_columns();
    $hidden         = array();
    $sortable       = $this->get_sortable_columns();

    // here we configure table headers, defined in our methods
    $this->_column_headers = array($columns, $hidden, $sortable);

    // [OPTIONAL] process bulk action if any
    $this->process_bulk_action();

    // will be used in pagination settings
    $total_items = $wpdb->get_var("SELECT COUNT(id) FROM $table_name");

    // prepare query params, as usual current page, order by and order direction                            
    $orderby = (isset($_REQUEST['orderby']) && in_array($_REQUEST['orderby'], array_keys($this->get_sortable_columns()))) ? $_REQUEST['orderby'] : 'name';

    $order = (isset($_REQUEST['order']) && in_array($_REQUEST['order'], array('asc', 'desc'))) ? $_REQUEST['order'] : 'asc';


    // [REQUIRED] define $items array
    // notice that last argument is ARRAY_A, so we will retrieve array
    $this->items = $wpdb->get_results($wpdb->prepare("SELECT * FROM $table_name ORDER BY $orderby $order LIMIT %d OFFSET %d", $per_page, $paged), ARRAY_A);

    // [REQUIRED] configure pagination
    $this->set_pagination_args(array(
        'total_items' => $total_items, // total items defined above
        'per_page' => $per_page, // per page constant defined at top of method
        'total_pages' => ceil($total_items / $per_page) // calculate pages count
    ));
}

Answer 1

如果您的第二页显示第一页的第二行，则您遇到以下问题：

$this->items =
    $wpdb->get_results(
        $wpdb->prepare(
            "SELECT * FROM $table_name ORDER BY $orderby $order LIMIT %d OFFSET %d", 
            $per_page, 
            $paged), 
        ARRAY_A);

特别是，我怀疑当你转到第二页时，$paged == 1表示你的查询结果偏移1，数据将从第2行开始。

您想要的是，您传递给查询的偏移量是：

offset = ($current_page - 1) * $per_page;

如果代码中的$paged 意味着为$current_page - 1，请将上述代码更改为以下代码：

$this->items =
    $wpdb->get_results(
        $wpdb->prepare(
            "SELECT * FROM $table_name ORDER BY $orderby $order LIMIT %d OFFSET %d", 
            $per_page, 
            $paged * $per_page), 
        ARRAY_A);

分页不适用于wordpress插件

1 个答案: