大约有 30,000 项符合查询结果（耗时：0.0172秒） [XML]
find vs find_by vs where
...t directly
irb(main):039:0> @kit = Kit.where(number: "3456")
Kit Load (1.2ms) SELECT "kits".* FROM "kits" WHERE "kits"."number" =
'3456' => #<ActiveRecord::Relation [#<Kit id: 1, number: "3456",
created_at: "2015-05-12 06:10:56", updated_at: "2015-05-12 07:16:58",
job_id: 2>]>...
Good Hash Function for Strings
...Java":
The String hash function implemented
in all releases prior to 1.2 examined
at most sixteen characters, evenly
spaced throughout the string, starting
with the first character. For large
collections of hierarchical names,
such as URLs, this hash function
displayed terrible beh...
HTML5 canvas ctx.fillText won't do line breaks?
...ple fillText calls while adding the height of the text to the y value each time. (measuring the width of M is what the skywriter people do to approximate text, I believe.)
share
|
improve this answe...
Get the current first responder without using a private API
... most excellent answer:
import UIKit
extension UIResponder {
// Swift 1.2 finally supports static vars!. If you use 1.1 see:
// http://stackoverflow.com/a/24924535/385979
private weak static var _currentFirstResponder: UIResponder? = nil
public class func currentFirstResponder...
Why doesn't CSS ellipsis work in table cell?
...53, 153, 153, 0.4);
}
table td, table th {
text-align: left;
padding: 1.2em 20px;
white-space: nowrap;
border-left: 1px solid rgba(153, 153, 153, 0.4);
}
table td:first-child, table th:first-child {
border-left: 0;
}
table th {
border-bottom: 1px solid rgba(153, 153, 153, 0.4);
font...
mailto link with HTML body
...ing: 6px;
}
thead {
text-align: center;
font-size: 1.2em;
color: navy;
background-color: silver;
font-weight: bold;
}
tbody td {
text-align: center;
}
</style>
</head>
<body>
<table width=100%>
<tr>...
What is the theoretical maximum number of open TCP connections that a modern Linux box can have
...
Be aware that the tcp_fin_timeout blocks the same socket (source, target, port combination) for another 60 seconds by default, which greatly reduces the number of actually available tcp connection between two systems, if connections are disconnected a...
How do I choose grid and block dimensions for CUDA kernels?
...g that CUDA 6.5 (now in Release Candidate version) includes several new runtime functions to aid in occupancy calculations and launch configuration, see
CUDA Pro Tip: Occupancy API Simplifies Launch Configuration
One of the useful functions is cudaOccupancyMaxPotentialBlockSize which heuristically...
What exactly do the Vagrant commands do?
...now key to your own private key and prepare boxes to use that.
Also some times, you may want to use ssh based automation with your VMs. In that case, knowing which key is being used is useful. You could do use normal ssh command - ssh -i keyfile ..
vagrant status <vmname>
This command is a ...
How do I install a NuGet package into the second project in a solution?
...
In Visual Studio 2015 (as of Nuget v3.1.2) the syntax is now:
Install-Package ThePackage -ProjectName YourProjectName
Note: -ProjectName vs -Project
share
|
i...