同一表的相同字段与相同的现场条件 - 可能吗？在一个SQL

Question

这里是我的查询我要执行它

$query="select * from $post INNER JOIN $postmeta on $postmeta.post_id= $post.ID 
where $post .post_status='publish' 
and $post .post_type ='task 
and $post .post_type='service' 
ORDER BY $post .post_date DESC "; 

如何执行

Answer 1

上了var $ postmeta的正确的sanitize和$后，你可以做建筑DINAMIC查询这样 通过字符串concantenation（因为var中的tabel和列名不允许在sql中）

$query="select * from " . $post . " INNER JOIN " . 
     $postmeta . " on " . $postmeta . ".post_id= " . $post .".ID where " . 
     $post . ".post_status='publish' and " . $post .".post_type ='task' and " . 
     $post . "post_type='service' ORDER BY " . $post .".post_date DESC ";