大约有 40,000 项符合查询结果（耗时：0.0591秒） [XML]
Turning multi-line string into single comma-separated
...
You can use awk and sed:
awk -vORS=, '{ print $2 }' file.txt | sed 's/,$/\n/'
Or if you want to use a pipe:
echo "data" | awk -vORS=, '{ print $2 }' | sed 's/,$/\n/'
To break it down:
awk is great at handling data broken down into fields
-vORS=, set...
What are the best practices for SQLite on Android?
...nd reads are generally OK from multiple threads, but Brad's answer is not correct. You have to be careful with how you create your connections and use them. There are situations where your update calls will fail, even if your database doesn't get corrupted.
The basic answer.
The SqliteOpenHelper...
How slow are .NET exceptions?
...xceptions. I wish to resolve a simple issue. 99% of the time the argument for not throwing exceptions revolves around them being slow while the other side claims (with benchmark test) that the speed is not the issue. I've read numerous blogs, articles, and posts pertaining one side or the other. So ...
What is a predicate in c#? [duplicate]
...nient way of basically testing if something is true of a given T object.
For example suppose I have a class:
class Person {
public string Name { get; set; }
public int Age { get; set; }
}
Now let's say I have a List<Person> people and I want to know if there's anyone named Oscar in...
Eclipse error: 'Failed to create the Java Virtual Machine'
I am getting this error message when I start Eclipse Helios on Windows 7:
41 Answers
4...
Why doesn't the height of a container element increase if it contains floated elements?
I would like to ask how height and float work. I have an outer div and an inner div that has content in it. Its height may vary depending on the content of the inner div but it seems that my inner div will overflow its outside div. What would be the proper way to do it?
...
Reading specific lines only
I'm using a for loop to read a file, but I only want to read specific lines, say line #26 and #30. Is there any built-in feature to achieve this?
...
node.js hash string?
...
Take a look at crypto.createHash(algorithm)
var filename = process.argv[2];
var crypto = require('crypto');
var fs = require('fs');
var md5sum = crypto.createHash('md5');
var s = fs.ReadStream(filename);
s.on('data', function(d) {
md5sum.update(d);
});
s....
How to edit log message already committed in Subversion?
...
Essentially you have to have admin rights (directly or indirectly) to the repository to do this. You can either configure the repository to allow all users to do this, or you can modify the log message directly on the server.
See this part of the Subversion FAQ (emphasis mi...
Why is a ConcurrentModificationException thrown and how to debug it
...n that is being iterated over is modified by anything other than the Iterator itself.
Iterator it = map.entrySet().iterator();
while (it.hasNext())
{
Entry item = it.next();
map.remove(item.getKey());
}
This will throw a ConcurrentModificationException when the it.hasNext() is called the se...