我试图运行以下查询来访问我的WP cf7dbplugin\\u submitted表，但它一直是空的。我已将我的表添加到wp db中。php模型本身：

Added the contact form table- cf7dbplugin_submits to the following at about line 268:
    var $tables = array(\'cf7dbplugin_submits\',\'posts\', . . .)

At around line 304 add the following:
    /**
     * WordPress cf7dbplugin_submits table
     */
    public $cf7dbplugin_submits;

因此，数据库函数应该可以找到它（在代码的其他地方使用时）。但对于任何$postid，以下内容始终是空的：

function action_getpost($postid) {
  global $wpdb, $out;
  $out[\'post\'] = array();
  $out[\'uploads\'] = array();

    // wp_posts has one row for each submitted form.
    // wp_nf_objectmeta includes a set of rows for each defined form.

    $query =
    "SELECT submit_time, form_name, field_value" .
    "FROM $wpdb->cf7dbplugin_submits " .
    "WHERE field_order = %d AND submit_time = %d ";

    $queryp = $wpdb->prepare($query, array(9999, $postid));
    if (empty($queryp)) {
      $out[\'errmsg\'] = "Internal error: \\"$query\\" \\"$postid\\"";
      return;
    }
    $wpdb->show_errors( true );
    $row = $wpdb->get_row($queryp, ARRAY_A);
    if (empty($row)) {
      $out[\'errmsg\'] = "No rows matching: \\"$postid\\"";
      return;
    }

如果我只是在phpMyAdmin中运行以下查询，其中$postid=1445125066.4375：

SELECT submit_time, form_name, field_value
FROM wp_cf7dbplugin_submits
WHERE field_order = 9999 AND submit_time = 1445125066.4375 

它生成所需的行

submit_time         form_name       field_value
1445125066.4375     Demographics    usernamehere

那么，为什么函数返回我的错误，即没有与1445125066.4375匹配的行？有什么想法吗？

$query =
"SELECT submit_time, form_name, field_value" .
"FROM {$wpdb->prefix}cf7dbplugin_submits " .
"WHERE field_order = 9999 AND submit_time = %f ";

$queryp = $wpdb->prepare($query, $postid);