Wordpress 数据库查询错误 Call to a member function get_results() on null
Posted ryanzheng
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在插件中的一个文件使用如下代码，无法查询
<body>
<?php
global $wpdb;
$sql = "";
$sql = "SELECT * FROM emgAdmin";
$sql = "$sql INNER JOIN wp_posts ON wp_posts.ID = emgAdmin.ID_OfPost ";
$ArrResult = $wpdb->get_results($sql);
while ($emgAdminResult = mysql_fetch_object($ArrResult)) {
echo($emgAdminResult->post_date);
}
?>
</body>
错误如下：
处理如下：
- 删除 global $wpdb
- 将以下代码添加到文件顶部
require_once( $_SERVER[‘DOCUMENT_ROOT‘] . ‘/wp-config.php‘ ); require_once( $_SERVER[‘DOCUMENT_ROOT‘] . ‘/wp-includes/wp-db.php‘ );
完整代码如下：
<?php require_once( $_SERVER[‘DOCUMENT_ROOT‘] . ‘/wp-config.php‘ ); require_once( $_SERVER[‘DOCUMENT_ROOT‘] . ‘/wp-includes/wp-db.php‘ ); $sql = ""; $sql = "SELECT * FROM emgAdmin"; $sql = "$sql INNER JOIN wp_posts ON wp_posts.ID = emgAdmin.ID_OfPost "; $ArrResult = $wpdb->get_results($sql); while ($emgAdminResult = mysql_fetch_object($ArrResult)) { echo($emgAdminResult->post_date); } ?>
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