大约有 42,000 项符合查询结果（耗时：0.0660秒） [XML]
Postgres: INSERT if does not exist already
...
Postgres 9.5 (released since 2016-01-07) offers an "upsert" command, also known as an ON CONFLICT clause to INSERT:
INSERT ... ON CONFLICT DO NOTHING/UPDATE
It solves many of the subtle problems you can run into when using concurrent operation, which some other answers propose.
...
Git push existing repo to a new and different remote repo server?
Say I have a repository on git.fedorahosted.org and I want to clone this into my account at github to have my own playground aside from the more "official" repo on fedorahosted.
What would be the steps to initially copy that over?
Within github there is this nice "fork" button, but I can't use thi...
How to make ReSharper re-evaluate its assembly reference highlighting
I am creating a Prism Project Template, and the template works great. But after I create a project with the template some of the files look like this:
...
What is the difference between git clone and checkout?
What is the difference between git clone and git checkout ?
5 Answers
5
...
#1071 - Specified key was too long; max key length is 767 bytes
When I executed the following command:
34 Answers
34
...
Where can I find the IIS logs?
... exactly as explained in their install guide, but am having some problems, and would like to see what the IIS log has to say. Embarrassingly enough, the problem is I can't find the log files!
...
How do I get a UTC Timestamp in JavaScript?
...at includes the timezone. (I had problems getting that to work in an older Android browser.)
Note that getTime() returns milliseconds, not plain seconds.
For a UTC/Unix timestamp, the following should suffice:
Math.floor((new Date()).getTime() / 1000)
It will factor the current timezone offset ...
Outline effect to text
...eady supported text-shadow property (supported in Chrome, Firefox, Opera, and IE 9 I believe).
Use four shadows to simulate a stroked text:
.strokeme {
color: white;
text-shadow: -1px -1px 0 #000, 1px -1px 0 #000, -1px 1px 0 #000, 1px 1px 0 #000;
}
<div class="strokeme">
Thi...
My pull request has been merged, what to do next?
...k).
Meaning your fork stays, but the branches within your fork can come and go.
You can also remove the fork if you are not planning to contribute further, but it will remove the corresponding entry in 'Repositories you contribute to'.
It is easier to:
delete your fix branch (actually, it i...
Java synchronized method lock on object, or method?
...s, you have synchronize on them separately in synchronized () blocks. If a and b were object references you would use:
public void addA() {
synchronized( a ) {
a++;
}
}
public void addB() {
synchronized( b ) {
b++;
}
}
But since they're primitives you can't do thi...