大约有 49,000 项符合查询结果（耗时：0.0405秒） [XML]
Run PostgreSQL queries from the command line
I inserted a data into a table....I wanna see now whole table with rows and columns and data. How I can display it through command?
...
JPA CascadeType.ALL does not delete orphans
... all child elements
delete main row
close session
With JPA 2.0, you can now use the option orphanRemoval = true
@OneToMany(mappedBy="foo", orphanRemoval=true)
share
|
improve this answer
...
Maximum number of characters using keystrokes A, Ctrl+A, Ctrl+C and Ctrl+V
...
There's a dynamic programming solution. We start off knowing 0 keys can make us 0 A's. Then we iterate through for i up to n, doing two things: pressing A once and pressing select all + copy followed by paste j times (actually j-i-1 below; note the trick here: the contents are s...
How can I find the number of days between two Date objects in Ruby?
...conds, such as this example
2.0.0-p195 :017 > a_date_time = DateTime.now
=> #<DateTime: 2013-12-31T12:23:03-08:00 ((2456658j,73383s,725757000n),-28800s,2299161j)>
2.0.0-p195 :018 > b_date_time = DateTime.now-20
=> #<DateTime: 2013-12-11T12:23:06-08:00 ((2456638j,73386s,699...
Download single files from GitHub
... the URL format mentioned in the answer (raw after the repository name) is now automatically redirected to the format you mention (hostname raw.github.com). When in doubt, browse to the file in question on github.com and click on the 'Raw' button.
– mklement0
A...
Rebasing a Git merge commit
...bout what contents will be in that merge commit, we only need nice history now.
History will looks like that (ignoring master):
* 51984c7 Merge branch 'topic' [HEAD -> correct-history]
|\
| * b62cae6 2 [topic]
* | f5a7ca8 5 [origin/master]
* | e7affb...
How do I check if an array includes a value in JavaScript?
... obj) {
return true;
}
}
return false;
}
And now you can simply use the following:
alert([1, 2, 3].contains(2)); // => true
alert([1, 2, 3].contains('2')); // => false
share
|
...
Browser doesn't scale below 400px?
...to the right instead of to the bottom
Resize the inspector panel - you can now make the browser area really small (down to 0px)
Update: Chrome now allows you to arrange the inspector windows vertically when docked to the right! This really improves the layout.
The HTML and CSS panels fit really...
How to configure XAMPP to send mail from localhost?
...ail-id@gmail.com
sendmail_path = "\"C:\xampp\sendmail\sendmail.exe\" -t"
Now Open C:\xampp\sendmail\sendmail.ini. Replace all the existing code in sendmail.ini with following code
[sendmail]
smtp_server=smtp.gmail.com
smtp_port=587
error_logfile=error.log
debug_logfile=debug.log
auth_username=my...
Is it bad to have my virtualenv directory inside my git repository?
...version too old), forcing an upgrade while the site was down. so... I will now never rely on pip freeze again to do this. the issue is that during your forced upgrade redeploy, no one pays for it, and for intermediate upgrades ("best practice" maintenance) no one does either.
–...