2

我有以下四个表，用于每个产品的产品过滤器场景。每个产品可以有多个属性，这些属性可以有多个值。

如何为多个属性搜索的用户请求构建 SQL 查询，例如

CPU: >1000
Price <700

我的最后一个 Jquery 是为了性能而损坏：

SELECT
  attributes_vals.*, handys.*
FROM
  handys join handy_has_vals on handys.id=handy_has_vals.handy_id 
  join attributes_vals on attributes_vals.id=handy_has_vals.val_id 
WHERE
  `attributes_vals`.`attr_id`=374 
  AND(`attributes_vals`.`vals` >=1000 AND `attributes_vals`.`vals` >=1500) 
  OR `attributes_vals`.`attr_id`=68  AND(`attributes_vals`.`vals`='YES')
  OR `attributes_vals`.`attr_id`=11  AND( `attributes_vals`.`vals` LIKE 'GPRS%')

小提琴和测试：http: //SQLFiddle.com/# !2/bba51/2

这是表格

handys
id  |   name    |   modell
1   |   Samsung |   galaxy A
2   |   Samsung |   galaxy B
3   |   Samsung |   galaxy C
4   |   Samsung |   galaxy D

handy_has_vals
handy_id    |   attr_id |   val_id
1           |   1       |   1
1           |   2       |   3
1           |   3       |   6
1           |   4       |   11
2           |   1       |   2
2           |   2       |   4
2           |   3       |   7
2           |   4       |   10
3           |   1       |   1
3           |   2       |   5
3           |   3       |   8
3           |   4       |   10
4           |   1       |   2
4           |   2       |   3
4           |   3       |   9
4           |   4       |   11

attributes_vals
id  |   attr_id |   vals
1   |   1       |   'YES'
2   |   1       |   'No'
3   |   2       |   '1200'
4   |   2       |   '1000'
5   |   2       |   '1500'
6   |   3       |   '300'
7   |   3       |   '350'
8   |   3       |   '800'
9   |   3       |   '550'
10  |   4       |   'YES'
11  |   4       |   'No'

attributes
id  |   attr_name
1   |   'GPS'
2   |   'CPU'
3   |   'Price'
4   |   'WLAN'
4

3 回答 3

1

它应该类似于：

SELECT * FROM handys h
INNER JOIN handy_has_vals hv ON h.id = hv.handy_id
INNER JOIN attributes a ON hv.attr_id = a.id
INNER JOIN attributes_vals av ON av.attr_id = a.id
WHERE ( a.attr_name = 'CPU' AND av.vals > '1000' ) or (  a.attr_name = 'Price' AND av.vals < '700' )

而且，为了通过数字而不是字符串进行比较：

SELECT * FROM handys h
INNER JOIN handy_has_vals hv ON h.id = hv.handy_id
INNER JOIN attributes a ON hv.attr_id = a.id
INNER JOIN attributes_vals av ON av.attr_id = a.id
WHERE ( a.attr_name = 'CPU' AND  cast(av.vals AS UNSIGNED) > '1000' ) or (  a.attr_name = 'Price' AND cast(av.vals AS UNSIGNED) < '700' )

但是，CAST在 where 子句中使用 可以保证您进行全表扫描，如果您有大量记录，这将大大降低性能。

于 2013-01-25T10:32:47.463 回答
0

试试这个查询

SELECT 
    attributes_vals . *, handys . *
from
    handys
        join
    handy_has_vals ON handys.id = handy_has_vals.handy_id
        join
    attributes_vals ON attributes_vals.id = handy_has_vals.val_id
WHERE
    attributes_vals.attr_id IN (68, 11, 374)
    AND ((attributes_vals.vals >= 1000 AND attributes_vals.vals >= 1500) 
           OR attributes_vals.vals = 'YES' OR attributes_vals.vals LIKE 'GPRS%')
于 2013-01-25T10:37:52.313 回答
0

试试这样

SELECT 
    attributes_vals . *, handys . *
from
    handys
        join
    handy_has_vals ON handys.id = handy_has_vals.handy_id
        join
    attributes_vals ON attributes_vals.id = handy_has_vals.val_id
WHERE
    ((attributes_vals.vals >= 1000 AND attributes_vals.vals >= 1500) 
           OR attributes_vals.vals = 'YES' OR attributes_vals.vals LIKE 'GPRS%')
于 2013-01-25T10:44:09.603 回答