在我的WordPress网站中,我有自定义用户元数据信誉.该值为数字,与Stackoverflow中的点/信号使用方式类似.
我想得到用户排名的人数.
浏览数据库,我需要做的就是按降序列出表格,我可以看到谁排名为1(最多点)等等……
有什么办法可以向用户显示排名吗?我猜最好的方法是按降序排序表,并以某种方式获取用户在该列表中的位置数量?
我想获取用户的排名.与下面的函数类似,获取用户的总评论数.我需要user_id作为参数:
function get_user_comments_count( $uid ){ global $wpdb; $where = 'WHERE comment_approved = 1 AND user_id = ' . $uid ; $comment_count = $wpdb->get_var("SELECT COUNT( * ) AS total FROM {$wpdb->comments} {$where}"); return $comment_count; }
解决方法
您可以使用连接作为用户表和元数据,并按列中存储的Meta_value进行排序,
SELECT u.* FROM `wp_users` u JOIN `wp_userMeta` um ON(u.ID = um.`user_id`) WHERE um.`Meta_key` = 'reputation' ORDER BY um.`Meta_value` * 1 DESC
按顺序使用* 1是一个简单的转换技巧到整数,desc将按用户的信誉评分列出用户,这样就会首先列出信誉较高的用户,依此类推
global $wpdb; $query=" SELECT u.*,um.`Meta_value` as `rank` FROM $wpdb->users u JOIN $wpdb->userMeta um ON(u.ID = um.`user_id`) WHERE um.`Meta_key` = 'reputation' ORDER BY um.`Meta_value` * 1 DESC"; $results = $wpdb->get_results($query,OBJECT );
循环搜索结果
foreach($results as $r){ echo $r->rank; // rank of user }
从评论中编辑
这是你的功能
function getReputationByUser($user_id){ if(!is_numeric($user_id)){ return false; } global $wpdb; $query=" SELECT um.`Meta_value` as `rank` FROM $wpdb->userMeta um WHERE um.`Meta_key` = 'reputation' AND um.user_id = '".$user_id."' "; $result = $wpdb->get_row($query); if(!empty($result)){ return $result->rank; } return false; } echo getReputationByUser(100);
上面的代码用于返回声誉,如果你想要基于声誉的用户等级你可以通过下面的查询得到这个,但我不确定你是否可以在WPDB类中使用@variables of MysqL
SELECT t1.`rank` FROM( SELECT um.user_id,@rownum:= @rownum + 1 `rank` FROM wp_userMeta um CROSS JOIN (SELECT @rownum := 0) t WHERE um.`Meta_key` = 'reputation' ORDER BY um.`Meta_value` * 1 DESC ) t1 WHERE t1.user_id = 100
function getReputationByUser($user_id){ if(!is_numeric($user_id)){ return false; } global $wpdb; $query=" SELECT t1.`rank` FROM( SELECT um.user_id,@rownum:= @rownum + 1 `rank` FROM $wpdb->userMeta um CROSS JOIN (SELECT @rownum := 0) t WHERE um.`Meta_key` = 'reputation' ORDER BY um.`Meta_value` * 1 DESC ) t1 WHERE t1.user_id = '".$user_id."'"; $result = $wpdb->get_row($query); if(!empty($result)){ return $result->rank; } return false; } echo getReputationByUser(100);
这是使用group_concat和find_in_set函数查找用户排名的另一种方法
SELECT user_id,FIND_IN_SET( user_id,(SELECT GROUP_CONCAT( user_id ORDER BY Meta_value * 1 DESC) FROM `wp_userMeta` WHERE Meta_key ='reputation') ) AS rank FROM wp_userMeta WHERE Meta_key ='reputation' AND user_id = 100 function getReputationByUser($user_id){ if(!is_numeric($user_id)){ return false; } global $wpdb; $query="SELECT user_id,FIND_IN_SET( user_id,(SELECT GROUP_CONCAT( user_id ORDER BY Meta_value * 1 DESC) FROM $wpdb->userMeta WHERE Meta_key ='reputation') ) AS rank FROM $wpdb->userMeta WHERE Meta_key ='reputation' AND user_id = '".$user_id."' "; $result = $wpdb->get_row($query); if(!empty($result)){ return $result->rank; } return false; } echo getReputationByUser(100);
According to docs The result is truncated to the maximum length that is given by the group_concat_max_len system variable,which has a default value of 1024. The value can be set higher,although the effective maximum length of the return value is constrained by the value of max_allowed_packet.