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Simulate CREATE DATABASE IF NOT EXISTS for PostgreSQL?
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Restrictions
You can ask the system catalog pg_database - accessible from any database in the same database cluster. The tricky part is that CREATE DATABASE can only be executed as a single statement. The manual:
CREATE DATABASE cannot be executed inside a transaction b...
How to get the difference between two arrays in JavaScript?
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Joshaven PotterJoshaven Potter
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PDB文件：每个开发人员都必须知道的 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...入GAC的.NET的binary，需要将PDB文件拷贝到C:\Windows\assembly\GAC_MSIL\Example\1.0.0.0__682bc775ff82796a类似的binary所在的目录。另一个变通的方法是定义环境变量DEVPATH，从而代替使用命令GACUTIL将binary放入GAC中。在定义DEVPATH后，只需要将binary和...
What does HTTP/1.1 302 mean exactly?
Some article I read once said that it means jumping (from one URI to another), but I detected this "302" even when there was actually no jumping at all!
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How do I write JSON data to a file?
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edited Feb 10 '17 at 10:32
Antony Hatchkins
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an...
How can I delete multiple lines in vi?
...wered Apr 10 '13 at 7:40
nperson325681nperson325681
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C read file line by line
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RobRob
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How do I get the file extension of a file in Java?
Just to be clear, I'm not looking for the MIME type.
30 Answers
30
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FormData.append(“key”, “value”) is not working
...a, the way to check the appended information on the server is by a simple $_POST['*your appended data*'] query. like so:
js:
$('form').submit(function(){
var sessionID = 8;
var formData = new FormData(this);
formData.append('id', sessionID);
$.ajax({
url: "yoururl.php",
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How to set Python's default version to 3.x on OS X?
...on='python3'
in your ~/.profile, and then source ~/.profile in your ~/.bash_profile and/or your~/.zsh_profile with a line like:
[ -e ~/.profile ] && . ~/.profile
This way, your alias will work across shells.
With this, python command now invokes python3. If you want to invoke the "origi...