【发布时间】:2017-05-15 17:03:51
【问题描述】:
我正在尝试制作一个可搜索的界面,我的后端包含三个 MySQL 数据库表:
tbl_country
mysql> select * from tbl_country;
+--------------+---------------+
| country_code | country |
+--------------+---------------+
| AFG | AFGHANISTAN |
| AUS | AUSTRALIA |
| CAN | CANADA |
| GBR | GREAT BRITAIN |
| IND | INDIA |
| USA | USA |
+--------------+---------------+
6 rows in set (0.00 sec)
tbl_state
mysql> select * from tbl_state;
+----------+------------------+--------------+
| state_id | state | country_code |
+----------+------------------+--------------+
| 1 | Maharashtra | IND |
| 2 | Delhi | IND |
| 3 | West Bengali | IND |
............
| 51 | Queensland | AUS |
+----------+------------------+--------------+
33 rows in set (0.00 sec)
tbl_city
mysql> select * from tbl_city;
+---------+----------+--------------------+
| city_id | state_id | city |
+---------+----------+--------------------+
| 1 | 1 | Mumbai (Bombay) |
| 2 | 1 | Nagpur |
.......
| 84 | 37 | Edinburgh |
| 122 | 44 | Cardiff |
| 127 | 46 | Melbourne |
| 130 | 48 | Perth |
| 131 | 49 | Adelaide |
| 132 | 50 | Canberra |
| 133 | 51 | Brisbane |
| 134 | 51 | Gold Coast |
+---------+----------+--------------------+
54 rows in set (0.00 sec)
我有我的 MySQL 数据库架构和值,如SQL Fiddle 中所示
我的搜索需要一个单一的界面,我可以在其中根据任何给定的城市或州的详细信息搜索所有国家/地区。
我正在尝试使用这个查询,它正确地给出了我想要获取的输出:
SELECT
-- tbl_country
c.country_code, c.country,
-- tbl_state
CAST(GROUP_CONCAT(s.state SEPARATOR ',') AS CHAR) as state,
-- tbl_city
CAST(GROUP_CONCAT(ct.city SEPARATOR ',') AS CHAR) as city
-- tbl_papers
FROM tbl_country c
LEFT JOIN tbl_state s ON s.country_code = c.country_code
LEFT JOIN tbl_city ct ON ct.state_id = s.state_id
GROUP BY (c.country_code);
我正在使用 Datatable 插件,这是一个非常强大且易于使用的插件,但是每当我尝试使用搜索过滤器时,它现在都可以工作,因为数据表的 Server Side PHP class 尝试创建一个动态查询,其中包含基于绑定的 where 条件列。
动态查询是这样的:
SELECT sql_calc_found_rows `c`.`country_code`,
`c`.`country`,
group_concat(`s`.`state` separator "," ) AS state,
group_concat(`ct`.`city` separator ",") AS city
FROM `tbl_country` AS `c`
LEFT JOIN `tbl_state` AS `s`
ON (
`s`.`country_code` = `c`.`country_code`)
LEFT JOIN `tbl_city` AS`ct`
ON `ct`.`state_id` = `s`.`state_id`
WHERE (
`c`.`country_code` LIKE :binding_0
OR `c`.`country` LIKE :binding_1
OR group_concat(`s`.`state` separator ",") LIKE :binding_2
OR group_concat(`ct`.`city` separator ",") LIKE :binding_3)
GROUP BY `c`.`country_code`
ORDER BY `c`.`country_code` ASC limit 0,
10
无论如何,我可以使用 PHP 和数据表插件根据上述场景中给定的城市、州和国家/地区的详细信息进行过滤/搜索。可能我需要更改我的查询结构!
【问题讨论】:
标签: php mysql datatables