大约有 16,000 项符合查询结果（耗时：0.0324秒） [XML]
When to use MyISAM and InnoDB? [duplicate]
MyISAM is designed with the idea that your database is queried far more than its updated and as a result it performs very fast read operations. If your read to write(insert|update) ratio is less than 15% its better to use MyISAM.
...
The way to check a HDFS directory's size?
...s [directory]
Since 0.20.203 (dead link) 1.0.4 and still compatible through 2.6.0:
hdfs dfs -du [-s] [-h] URI [URI …]
You can also run hadoop fs -help for more info and specifics.
share
|
imp...
Sorting arraylist in alphabetical order (case insensitive)
...ames which contains names of people. I want to sort the arraylist in alphabetical order.
8 Answers
...
Add 10 seconds to a Date
...
There's a setSeconds method as well:
var t = new Date();
t.setSeconds(t.getSeconds() + 10);
For a list of the other Date functions, you should check out MDN
setSeconds will correctly handle wrap-around cases:
var d;
d = new Date('2014-01-01 10:11:55');
alert(d.getMinutes() + ':' + d.g...
Rename a dictionary key
...dict[new_key] = mydict.pop(old_key)
For an OrderedDict, I think you must build an entirely new one using a comprehension.
>>> OrderedDict(zip('123', 'abc'))
OrderedDict([('1', 'a'), ('2', 'b'), ('3', 'c')])
>>> oldkey, newkey = '2', 'potato'
>>> OrderedDict((newkey if...
What is this operator in MySQL?
I'm working on code written by a previous developer and in a query it says,
9 Answers
...
What's the syntax for mod in java
... % 2) == 0)
{
isEven = true;
}
else
{
isEven = false;
}
This can be simplified to a one-liner:
isEven = (a % 2) == 0;
share
|
improve this answer
|
follow
...
How do I tell CPAN to install all dependencies?
...
Here is the one-liner making these changes permanent including automatic first-time CPAN configuration:
perl -MCPAN -e 'my $c = "CPAN::HandleConfig"; $c->load(doit => 1, autoconfig => 1); $c->edit(prerequisites_policy => "follow"); $c-&...
Java String array: is there a size of method?
I come from a php background and in php, there is an array_size() function which tells you how many elements in the array are used.
...
Locate current file in IntelliJ
...hat you want. You need to hit Enter afterwards as IDEA allows multiple "targets" for navigation (project structure, file structure etc).
(Note you can also set AutoScroll to Source and AutoScroll from source using the two "boxes with arrows" buttons above the project structure view but this can get...