对于带有自动完成机场输入字段,目前有一个表,说明机场,autocomplete_airport
:提高MySQL LIKE查询的速度?
lang | description (with INDEX) | ...
-----+----------------------------------------------------+----
pt | New York - John F Kennedy (JFK), Estados Unidos | ...
pt | Nova Iorque - John F Kennedy (JFK), Estados Unidos | ...
...
自动完成适用于单个单词。所以当用户输入“yor”时,“纽约”出现(如果在LIMIT中)。该查询目前工作如下:
SELECT * FROM autocomplete_airport WHERE lang = "pt"
AND (description LIKE "%(yor)%"
OR description LIKE "yor%"
OR description LIKE "% yor%")
ORDER BY description
LIMIT 15
现在我不知道如何加快速度。一种想法是创建下面的数据库结构,表autocomplete_airport
和autocomplete_airport_word
:
id | lang | description (with INDEX) | ...
-----+------+----------------------------------------------------+----
123 | pt | New York - John F Kennedy (JFK), Estados Unidos | ...
124 | pt | Nova Iorque - John F Kennedy (JFK), Estados Unidos | ...
...
word (with INDEX) | autocomplete_airport_id
------------------+------------------------
New | 123
York | 123
John | 123
F | 123
Kennedy | 123
JFK | 123
...
然后选择只需要在字符串的开始搜索:
SELECT DISTINCT autocomplete_airport.*
FROM autocomplete_airport
INNER JOIN autocomplete_airport_word
ON autocomplete_airport.id = autocomplete_airport_word.autocomplete_airport_id
WHERE lang = "pt"
AND word LIKE "yor%"
ORDER BY description
LIMIT 15
那是新的结构值得的麻烦?它真的会加快速度吗?有一种更简单的方法吗?
更新
只注意到了字表有一个缺陷。结果是:搜索“纽约”不会给出任何结果。什么应该工作:
term (with INDEX) | autocomplete_airport_id
------------------------------------------------+------------------------
New York - John F Kennedy (JFK), Estados Unidos | 123
York - John F Kennedy (JFK), Estados Unidos | 123
John F Kennedy (JFK), Estados Unidos | 123
F Kennedy (JFK), Estados Unidos | 123
Kennedy (JFK), Estados Unidos | 123
(JFK), Estados Unidos | 123
Estados Unidos | 123
Unidos | 123
JFK | 123
这样做! – fancyPants 2012-03-15 09:56:16