问题描述
我在数据库中有一个表,其中一列包含一个 URL,如 http://example.com/users/*/个人资料
我得到了一个 URL(例如 http://example.com/users/234/profile) 并希望选择 db 中与 url 匹配的所有行(在这种情况下 * 是通配符).
我正在考虑使用正则表达式来执行此操作,方法是将 * 替换为任何字符的正则表达式.但我不确定选择的 SQL 或 LINQ 代码应该是什么.
你们有什么想法吗?
推荐答案
除非我遗漏了一些明显的东西,否则这应该只需要一个简单的 LIKE 查询.
SELECT * FROM YourTable WHERE URL LIKE 'http://example.com/users/%/'
正则表达式在 SQL 查询中是多余的和棘手的.
注意:% 字符相当于 SQL 表达式中的 * 通配符.
如果您想使用 LINQ 并且只针对 SQL Server,您可以使用以下语法:
var results = from yt in YourTable where SqlMethods.Like(yt.URL, "http://example.com/users/%/") select yt;
问题描述
I have a table in the db with one column containing a URL like http://example.com/users/*/profile
I am given a URL (like http://example.com/users/234/profile) and want to select all the rows in the db that match the url (in this case * is a wildcard).
I was thinking of using Regex to do this, by replacing the * with regex for any character. But am unsure as to what the SQL or LINQ code should be for the selection.
Do you guys have any ideas?
推荐答案
Unless I am missing something obvious, this should just require a simple LIKE query.
SELECT * FROM YourTable WHERE URL LIKE 'http://example.com/users/%/'
Regex is overkill and tricky in SQL queries.
Note: The % character is the equivalent of the * wildcard in SQL expressions.
If you want to use LINQ and are only working against SQL Server, you can use this syntax:
var results = from yt in YourTable where SqlMethods.Like(yt.URL, "http://example.com/users/%/") select yt;