Question

我有一个mysql行，其坐标保存在lat / long中。我需要将它改为long / lat。

我知道这需要以某种方式被消除并改变。

在MySQL中执行此操作的正确方法是什么？

样品：

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Answer 1

一般规则（称为DB规范化）是：

永远不要在一列中存储多个值！

因此，如果您可以更改您的桌面设计，您可以这样做（在我的示例中，我们存储用户收藏的点数 - 我不知道您的观点有什么用途）：

users table
-----------
id
name
....


coordinates table
-----------------
user_id
lng
lat

如果您想要检索用户'Tom'的所有记录，那么您可以运行此查询

select c.lng, c.lat
from coordinates c
join users u on u.id = c.user_id
where u.name = 'Tom'

Answer 2

如果你的行有一个包含逗号分隔的纬度/长度对的列表，那么最好将long / lat存储为新表中的单独字段，其中外键引用原始表。更好的方法是使用@a_horse_with_no_name建议的Point字段，而不是lat / long单独的字段。

MySQL在逗号之前和之后移动字符串

2 个答案:

永远不要在一列中存储多个值！