大约有 40,000 项符合查询结果（耗时：0.0737秒） [XML]
Is it safe to parse a /proc/ file?
...as subject to a race condition until then, and still is in most enterprise kernels. See fs/proc/uptime.c for the current source, or the commit that made it atomic. On a pre-2.6.30 kernel, you can open the file, read a bit of it, then if you later come back and read again, the piece you get will be...
Creating a URL in the controller .NET MVC
I need to be able to construct a link in the Action on the controller to send an email. What is best practice to do this? I don't want to construct it myself in case my routes change.
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Hibernate: hbm2ddl.auto=update in production?
Is it okay to run Hibernate applications configured with hbm2ddl.auto=update to update the database schema in a production environment?
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SQL Server: Query fast, but slow from procedure
...stored procedure.
I found another answer here "Parameter Sniffing", Thanks Omnibuzz. Boils down to using "local Variables" in your stored procedure queries, but read the original for more understanding, it's a great write up. e.g.
Slow way:
CREATE PROCEDURE GetOrderForCustomers(@CustID varchar(...
T-SQL - function with default parameters
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you have to call it like this
SELECT dbo.CheckIfSFExists(23, default)
From Technet:
When a parameter of the function has a default value, the keyword
DEFAULT must be specified when the function is called in order to
retrieve the default...
LINQ: Not Any vs All Don't
Often I want to check if a provided value matches one in a list (e.g. when validating):
8 Answers
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How to change the default collation of a table?
...character set utf8mb4 collate utf8mb4_unicode_ci;
Edited the answer, thanks to the prompting of some comments:
Should avoid recommending utf8. It's almost never what you want, and often leads to unexpected messes. The utf8 character set is not fully compatible with UTF-8. The utf8mb4 character...
How to do an INNER JOIN on multiple columns
I'm working on a homework project and I'm supposed to perform a database query which finds flights either by the city name or the airport code, but the flights table only contains the airport codes so if I want to search by city I have to join on the airports table.
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How to see the CREATE VIEW code for a view in PostgreSQL?
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Kept having to return here to look up pg_get_viewdef (how to remember that!!), so searched for a more memorable command... and got it:
\d+ viewname
You can see similar sorts of commands by typing \? at the pgsql command li...
In HTML5, is the localStorage object isolated per page/domain?
...d per page/domain? I am wondering because of how I would name localStorage keys. Do I need a separate prefix? Or can I name them whatever I want?
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