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What is the “N+1 selects problem” in ORM (Object-Relational Mapping)?
The "N+1 selects problem" is generally stated as a problem in Object-Relational mapping (ORM) discussions, and I understand that it has something to do with having to make a lot of database queries for something that seems simple in the object world.
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Unique Key constraints for multiple columns in Entity Framework
....1, you can now do this:
[Index("IX_FirstAndSecond", 1, IsUnique = true)]
public int FirstColumn { get; set; }
[Index("IX_FirstAndSecond", 2, IsUnique = true)]
public int SecondColumn { get; set; }
The second parameter in the attribute is where you can specify the order of the columns in the ind...
Hidden features of Scala
What are the hidden features of Scala that every Scala developer should be aware of?
28 Answers
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How to determine the current shell I'm working on
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There are three approaches to finding the name of the current shell's executable:
Please note that all three approaches can be fooled if the executable of the shell is /bin/sh, but it's really a renamed bash, for example (which frequently ha...
Modular multiplicative inverse function in Python
Does some standard Python module contain a function to compute modular multiplicative inverse of a number, i.e. a number y = invmod(x, p) such that x*y == 1 (mod p) ? Google doesn't seem to give any good hints on this.
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How do I pass a string into subprocess.Popen (using the stdin argument)?
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Popen.communicate() documentation:
Note that if you want to send data to
the process’s stdin, you need to
create the Popen object with
stdin=PIPE. Similarly, to get anything
other than None in the result tuple,
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How to get process ID of background process?
I start a background process from my shell script, and I would like to kill this process when my script finishes.
7 Answers...
How to git-cherry-pick only changes to certain files?
... into a Git branch the changes made only to some of the files changed in a particular commit which includes changes to multiple files, how can this be achieved?
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ProcessBuilder: Forwarding stdout and stderr of started processes without blocking the main thread
I'm building a process in Java using ProcessBuilder as follows:
10 Answers
10
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MySQL一次主从数据不一致的问题解决过程 - 数据库(内核) - 清泛网 - 专注C/...
...性能，网络影响有点大，数据丢失的应该很少
2 主库dump数据，锁库，然后同步，不好。 影响业务使用
3 percona-toolkit 中的工具来校验和同步，从介绍上来看是符合现在的情况的，使用上还需要学习和认识才行。
下面是几个参...