我需要在我的Sql数据库中安排处理——坐标。 储存地址的最佳做法是什么? 是否需要压缩对加以描述或使用?
edit: Ok, let s I reassert my question. How to store long (up to 512) string in database if I need to search by exactly this string in future.
我需要在我的Sql数据库中安排处理——坐标。 储存地址的最佳做法是什么? 是否需要压缩对加以描述或使用?
edit: Ok, let s I reassert my question. How to store long (up to 512) string in database if I need to search by exactly this string in future.
如果你绝对相信你的搜索扼杀能够实现正常化(例如:缩小所有额外空间,强迫降低案例等),以避免含糊不清,而且你需要寻找完全的匹配(即,你要么发现完全是正常的扼杀,要么不需要通过旁观、声音、部分配对等进行搜索,这就是我如何阅读你“正是这样描述”的话),你可以考虑计算扼杀的散码,把它列入行文和索引。
如果你使用重代码功能,使数人回归,你将有一个非常有效的准入指数。 当然,你仍然能够保持原封顶的印刷场和不同的准入方式。
可能的问题:虽然散列码能够尽量减少散射碰撞的可能性,但不能保证不会发生,因此,你也应当加以管理。
此外,除非你有很多地址和地址,否则,我怀疑速度的提高将值得一提。
MySql能够管理这些价值观的坐标和运作,并试图查阅。
如果你想要更简单的话,我通常会单独存放城市法典、城市名称和附加物。 然后,我可以对这些领域进行指数化和搜索(一个或一个组合)。
如果你想简单地使用坐标,你就可以简单地储存纬度/长度,进行基本比较。
答案见here。
I noticed that there were some threads with similar questions, and I did look through them but did not really get a convincing answer. Here s my question: The subquery below returns a Table with 3 ...
<?php $con=mysql_connect("localhost","mts","mts"); if(!con) { die( unable to connect . mysql_error()); } mysql_select_db("mts",$con); /* date_default_timezone_set ("Asia/Calcutta"); $date = ...
我把我的用心从使用QQL转向MySQL。 它与凯科特合作,现在不工作,因为我已经改变,使用MySQL。 这里的错误信息是:
We have a restaurant table that has lat-long data for each row. We need to write a query that performs a search to find all restaurants within the provided radius e.g. 1 mile, 5 miles etc. We have ...
Is it possible in php to return a specific row of data from a mysql query? None of the fetch statements that I ve found return a 2 dimensional array to access specific rows. I want to be able to ...
Our website was developed with a meta tag set to... <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" /> This works fine for M-dashes and special quotes, etc. However, I ...
What are some of the strategies being used for pagination of data sets that involve complex queries? count(*) takes ~1.5 sec so we don t want to hit the DB for every page view. Currently there are ~...
My table looks like person_id | car_id | miles ------------------------------ 1 | 1 | 100 1 | 2 | 200 2 | 3 | 1000 2 | 4 | 500 I need to ...