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What is a plain English explanation of “Big O” notation?
... have polynomial complexity or is solvable in polynomial time.
O(n), O(n2) etc. are all polynomial time. Some problems cannot be solved in polynomial time. Certain things are used in the world because of this. Public Key Cryptography is a prime example. It is computationally hard to find two prime f...
Proper Repository Pattern Design in PHP?
...is the interface:
interface AllUsersQueryInterface
{
public function fetch($fields);
}
Query Object Implementation
This is where we can use a data mapper again to help speed up development. Notice that I am allowing one tweak to the returned dataset—the fields. This is about as far as I wa...
What is your naming convention for stored procedures? [closed]
...o search 50 odd Add procedures for the Product add, and 50 odd for the Get etc.
Because of this in my new application I'm planning on grouping procedure names by object, I'm also dropping the usp as I feel it is somewhat redundant, other than to tell me its a procedure, something I can deduct from ...
Case insensitive 'in'
...ults for string inclusion, avoid warnings in some cases involving unicode, etc).
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Use of #pragma in C
...to do something, set some option, take some action, override some default, etc. that may or may not apply to all machines and operating systems.
See msdn for more info.
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Why use prefixes on member variables in C++ classes
...wish to make the type clear, I use standard suffixes (e.g. List, ComboBox, etc).
This makes the programmer aware of the usage of the variable whenever they see/use it. Arguably the most important case is "p" for pointer (because the usage changes from var. to var-> and you have to be much more c...
Is there a better way to express nested namespaces in C++ within the header
...h)
One level of "public API" namespaces for certain aspects (UI, DB access etc.)
"Implementation Detail" namespaces that are not part of the public API
(anonymous namespaces in .cpp's, or ModuleDetailHereBeTygers namespaces in
header-only libs)
enums are the biggest problem in my experience. They ...
解决：error while loading shared libraries: libpcre.so.1: cannot open ...
...件的位置（可以使用命令 whereis xxx ），并把目录添加到/etc/ld.so.conf.d/libc.conf中，没有则新建这个文件。然后再运行ldconfig才可以生效。
解决：用以下shell命令解决：（用root用户）
echo "/usr/local/lib" >> /etc/ld.so.conf.d/libc.conf
sudo...
How to manage local vs production settings in Django?
...local development and the production server? Some of them (like constants, etc) can be changed/accessed in both, but some of them (like paths to static files) need to remain different, and hence should not be overwritten every time the new code is deployed.
...
Location of my.cnf file on macOS
...lues. To set up your own my.cnf, you could just create a file straight in /etc.
OS X provides example configuration files at /usr/local/mysql/support-files/.
And if you can't find them there, MySQLWorkbench can create them for you by:
Opening a connection
Selecting the 'Options File' under 'IN...