Question

我正在使用mysql构建基于PHP的搜索。

但我遇到了这个问题：我有一个很长很重的（在mysql服务器上）查询搜索。

要对结果进行分页，我需要以下数据：

计算所有结果（不限，所以我知道要显示多少个琐事）
```
SELECT COUNT(*) as count FROM table WHERE col="val"
```

结果有限 - 我向用户展示

SELECT * FROM table WHERE col="val" LIMIT 20, 10

如何避免对上述2项要求进行2次单独查询？

注意： 为了避免＆＃34;你的查询有多重？＆＃34;，这是我真实的条件：

    SELECT *, 
    (1000 * 6371 * acos( cos( radians(42.6051862) ) * cos( radians( project_lat ) ) * cos( radians( project_lng ) - radians(23.037836800000036) ) + sin( radians(42.6051862) ) * sin( radians( project_lat ) ) ) ) AS distance
    FROM `projects` 

    JOIN `subcategories` ON `projects`.`subcat_id` = `subcategories`.`subcat_id` 
    JOIN `categories` ON `subcategories`.`cat_id` = `categories`.`cat_id`
    JOIN `project_images` ON `projects`.`project_id` = `project_images`.`project_id` 

    WHERE `projects`.`subcat_id` = 618 
    AND `project_start` < '2016-10-30' 
    AND `project_start` > '2016-10-14' 
    AND `project_price` > 123 
    AND `project_price` < 233 
    AND `project_currency` = 'BTN' 
    AND `project_approved` = 1 
    AND MATCH (project_title, project_description) AGAINST ('test') 
    GROUP BY `projects`.`project_id` 
    HAVING `distance` < 7400

Answer 1

使用sql_calc_found_rows

SELECT SQL_CALC_FOUND_ROWS * FROM table WHERE id > 100 LIMIT 10;
SELECT FOUND_ROWS();

PHP搜索结果分页

1 个答案: