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Rails 4 LIKE query - ActiveRecord adds quotes
...ouse9 instances of % and _ inside search will not be sanitized, under this approach.
– Barry Kelly
Oct 30 '14 at 0:26
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Show pending migrations in rails
Is there a rake task that shows the pending migrations in a rails app?
10 Answers
10
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Why does the 260 character path length limit exist in Windows?
...r nonsense. Microsoft doesn't want to break the millions of poorly written applications out there that assume things about the system that were never guaranteed. Unfortunately, things were the same way for so long that developers came to rely on them, so changing it now would break 3rd party applica...
Why is creating a new process more expensive on Windows than Linux?
...quires a compatbility shim, checking whether software restriction policies apply, yada yada.
That said, I see the overall slowdown in the sum of all those little things that have to be done in addition to the raw creation of a process, VA space, and initial thread. But as said in the beginning -- d...
Is ServiceLocator an anti-pattern?
...nnot use the classes before satisfying them.
In a typical line of business application you should avoid the use of service location for that very reason. It should be the pattern to use when there are no other options.
Is the pattern an anti-pattern?
No.
For instance, inversion of control containers...
to drawRect or not to drawRect (when should one use drawRect/Core Graphics vs subviews/images and wh
...ews. Use Instruments to measure the frame rate on the oldest hardware your app will support. If you can't get 60fps, drop down to CoreGraphics. When you've done this for a while, you get a sense for when UIKit is probably a waste of time.
So, why is Core Graphics fast?
CoreGraphics isn't really fa...
How do ACID and database transactions work?
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ACID is a set of properties that you would like to apply when modifying a database.
Atomicity
Consistency
Isolation
Durability
A transaction is a set of related changes which is used to achieve some of the ACID properties. Transactions are tools to achieve the ACID proper...
C# Events and Thread Safety
...sory performance testing to see the impact of the subscribe-empty-delegate approach, and here are my results:
Executing 50000000 iterations . . .
OnNonThreadSafeEvent took: 432ms
OnClassicNullCheckedEvent took: 490ms
OnPreInitializedEvent took: 614ms <--
Subscribing an empty delegate to...
HC-05 蓝牙模块开发 - 创客硬件开发 - 清泛IT社区，为创新赋能！
它有六个引脚，引脚的作用如下：
通过厂商App连接串口测试，发现HC-05模块是经典蓝牙2.0，并不支持蓝牙5.0（低功耗BLE），它需要配对码进行配对，App Inventor 2 中使用“蓝牙客户端”组件，而非BLE拓展，必须在手机设置中...
How do I create a comma-separated list from an array in PHP?
I know how to loop through items of an array using foreach and append a comma, but it's always a pain having to take off the final comma. Is there an easy PHP way of doing it?
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