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栈和队列的面试题Java实现 - 更多技术 - 清泛网 - 专注C/C++及内核技术
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作者：生命壹号
文章源自：http://www.cnblogs.com/smyhvae/p/4795984.html
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Use PHP to create, edit and delete crontab jobs?
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crontab command usage
usage: crontab [-u user] file
crontab [-u user] [ -e | -l | -r ]
(default operation is replace, per 1003.2)
-e (edit user's crontab)
-l (list user's crontab)
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How to log something in Rails in an independent log file?
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Rails 2.3-style plugins and deprecation warnings running task in Heroku
...3-08, heroku always injected plugins in rails 3 apps, even apps with the recommended gems. This was an issue with the ruby buildpack, and was fixed by PR 11, merged on 2013-08-06.
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MySQL: Enable LOAD DATA LOCAL INFILE
...cal-infile=1 to my.cnf file under [client], [mysqld], and [mysql] and used combinations of these. All with the same results. I've tried re-starting workbench but no luck. I've stopped and started mySQL workbench between each change as well.
– OrwellHindenberg
J...
How can I generate an MD5 hash?
...etInstance("MD5") to get a MD5 instance of MessageDigest you can use.
The compute the hash by doing one of:
Feed the entire input as a byte[] and calculate the hash in one operation with md.digest(bytes).
Feed the MessageDigest one byte[] chunk at a time by calling md.update(bytes). When you're d...
Using column alias in WHERE clause of MySQL query produces an error
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be determined.
Copied from MySQL documentation
As pointed in the comments, using HAVING instead may do the work. Make sure to give a read at this WHERE vs HAVING though.
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How do I compare two DateTime objects in PHP 5.2.8?
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The following seems to confirm that there are comparison operators for the DateTime class:
dev:~# php
<?php
date_default_timezone_set('Europe/London');
$d1 = new DateTime('2008-08-03 14:52:10');
$d2 = new DateTime('2008-01-03 11:11:10');
var_dump($d1 == $d2);
var_du...
Convert timestamp in milliseconds to string formatted time in Java
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Comment: HH will print the hour at that date (0-23), not the total amount of hours elapsed since 1970. Just sayin'.
– JohnyTex
Aug 19 '14 at 11:41
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