大约有 15,000 项符合查询结果（耗时：0.0185秒） [XML]
How to wait in a batch script? [duplicate]
...ly doesn't exist and specify the desired timeout:
ping 192.0.2.2 -n 1 -w 10000 > nul
And since the address does not exists, it'll wait 10,000 ms (10 seconds) and returns.
The -w 10000 part specifies the desired timeout in milliseconds.
The -n 1 part tells ping that it should only tries once ...
Current time in microseconds in java
...first three digits will have numbers like this:
2017-12-23T12:34:56.789000000Z
New Clock In Java 9
The OpenJDK and Oracle implementations of Java 9 have a new default Clock implementation with finer granularity, up to the full nanosecond capability of the java.time classes.
See the OpenJDK ...
How to remove newlines from beginning and end of a string?
...ot also a non-breaking space ('\u00A0', '\u2007', '\u202F').
It is '\t', U+0009 HORIZONTAL TABULATION.
It is '\n', U+000A LINE FEED.
It is '\u000B', U+000B VERTICAL TABULATION.
It is '\f', U+000C FORM FEED.
It is '\r', U+000D CARRIAGE RETURN.
It is '\u001C', U+001C FILE SEPARATOR.
It is '\u001D', U+...
Select multiple records based on list of Id's with linq
...id, (up, id) => up);
And now result of my measurement. I generated 100 000 UserProfiles and 100 000 ids. Join took 32ms and .Where with .Contains took 2 minutes and 19 seconds! I used pure IEnumerable for this testing to prove my statement. If you use List instead of IEnumerable, .Where and .Con...
.NET String.Format() to add commas in thousands place for a number
...
int number = 1000000000;
string whatYouWant = number.ToString("#,##0");
//You get: 1,000,000,000
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LINQ .Any VS .Exists - What's the difference?
...o evaluate both values at almost same time)
var list1 = Generate(1000000);
var forceListEval = list1.SingleOrDefault(o => o == "0123456789012");
if (forceListEval != "sdsdf")
{
var s = string.Empty;
var start2 = DateTime.Now;
if...
How does tuple comparison work in Python?
...: x = tuple([0 for _ in range(n)]) and do the same for y. Setting n=100, 1000, 10,000, and 100,000 and running %timeit x==y gave timing values of .5, 4.6, 43.9, and 443 microseconds respectively, which is about as close to O(n) as you can practically get.
– Michael Scott Cuth...
How to convert a unix timestamp (seconds since epoch) to Ruby DateTime?
....
DateTime.strptime("1318996912",'%s') # => Wed, 19 Oct 2011 04:01:52 +0000
displays a return value in UTC and requires the seconds to be a String and outputs a UTC Time object, whereas
Time.at(1318996912) # => 2011-10-19 00:01:52 -0400
displays a return value in the LOCAL time zone, nor...
How to evaluate http response codes from bash/shell script?
...esponse is a good answer, it overlooks failure scenarios. curl will return 000 if there is an error in the request or there is a connection failure.
url='http://localhost:8080/'
status=$(curl --head --location --connect-timeout 5 --write-out %{http_code} --silent --output /dev/null ${url})
[[ $stat...
ERROR 2006 (HY000): MySQL server has gone away
...
I solved the error ERROR 2006 (HY000) at line 97: MySQL server has gone away and successfully migrated a >5GB sql file by performing these two steps in order:
Created /etc/my.cnf as others have recommended, with the following contents:
[mysql]
connect_...