Question

如何为$ sql变量添加更多三元if语句？当我尝试添加更多时，它输出空白：

工作：

$sql = "SELECT r.title,r.author,r.summary,r.posted_on,r.review_url,r.rating 
        FROM reviews r 
        LEFT JOIN websites w 
        ON w.id=r.website_id 
        WHERE w.rooftop_id=$rooftop_id
        AND review_site_id IN ($sites)
        AND rating >= $star_threshold
        AND review_status_id=2
        " . ($pagination == 1 ? " LIMIT $offset, $review_limit " : "");

不工作：

$sql = "SELECT r.title,r.author,r.summary,r.posted_on,r.review_url,r.rating 
        FROM reviews r 
        LEFT JOIN websites w 
        ON w.id=r.website_id 
        WHERE w.rooftop_id=$rooftop_id
        AND review_site_id IN ($sites)
        AND rating >= $star_threshold
        AND review_status_id=2
        " . ($pagination == 1 ? " LIMIT $offset, $review_limit " : "")
        " . ($rating_filter == 1 ? " ORDER BY r.rating " : "");

Answer 1

您的查询中有拼写错误，请尝试以下操作：

$sql = "SELECT r.title,r.author,r.summary,r.posted_on,r.review_url,r.rating 
        FROM reviews r 
        LEFT JOIN websites w 
        ON w.id=r.website_id 
        WHERE w.rooftop_id=$rooftop_id
        AND review_site_id IN ($sites)
        AND rating >= $star_threshold
        AND review_status_id=2
        " . ($pagination == 1 ? " LIMIT $offset, $review_limit " : "")
        . ($rating_filter == 1 ? " ORDER BY r.rating " : "");

Answer 2

就MySQL而言，LIMIT子句不能位于ORDER BY语句中的SELECT子句之前。 ORDER BY子句必须在之前 LIMIT子句。

你在php语法中遇到了一个简单的问题，在你发布的最后一行代码的开头有一个额外的双引号。

三元if语句用于mysql查询

2 个答案: