Question

我正在运行以下查询：

$query = "SELECT post_title, ID, post_date_gmt, post_author
        FROM wp_posts 
            WHERE post_type='course-manager' 
        AND post_status='publish' 
        AND SUBSTRING(post_date_gmt,1,4) = '$this->yearGet'
        AND SUBSTRING(post_date_gmt,6,2) = '$this->monthGet'
        AND post_author = '$userid'
        ORDER BY post_title"; 
        $query_result = mysql_query ($query);
        while ($info = mysql_fetch_array($query_result))
        {

目前这只是查询wordpress posts表。我想查询wordpress postmeta表中的数据，一个例子就是这样我在其中添加了“在postmeta表中的AND course_date：

 $query = "SELECT post_title, ID, post_date_gmt, post_author
        FROM wp_posts 
            WHERE post_type='course-manager' 
        AND post_status='publish' 
        AND SUBSTRING(post_date_gmt,1,4) = '$this->yearGet'
        AND SUBSTRING(post_date_gmt,6,2) = '$this->monthGet'
        AND post_author = '$userid'
            AND course_date = '$this->yearGet'
        ORDER BY post_title"; 
        $query_result = mysql_query ($query);
        while ($info = mysql_fetch_array($query_result))
        {

任何帮助将不胜感激

Answer 1

如果需要查询源来自多个表的组合数据集，则需要进行连接。基本上，您需要在post和postmeta的情况下在2个表之间建立连接，该连接将是post id。所以查询应该如下所示：

SELECT a.something, b.anotherthing
FROM wp_posts AS a JOIN wp_postmeta AS b
ON a.ID = b.post_id
//followed by all of your where clause...

一次查询2个wordpress数据库表

1 个答案: