来自数据库的Wordpress SELECT

Question

In Wordpress data base I have table banners, I try to write SELECT to get data:

'SELECT * FROM $wpdb->banners' also try 'SELECT * FROM $wpdb->wp_banners' but no one query get me ressults, what I do wrong ?

Answer 1

The variable $wpdb->banners needs to be a) defined somewhere (I'm not sure how this is handled in Wordpress, so you may or may not be using the right variable) and b) interpreted by PHP.

In what you've pasted here, you seem to be using single quotes, which will stop PHP interpreting the variable - it will assume you mean a literal $ , which will lead to invalid SQL. You need to either use double quotes - "SELECT * FROM {$wpdb->banners}" - or string concatenation - 'SELECT * FROM ' . $wpdb->banners 'SELECT * FROM ' . $wpdb->banners