大约有 40,000 项符合查询结果（耗时：0.0564秒） [XML]
Does SQLAlchemy have an equivalent of Django's get_or_create?
...
Don't you need to add the new instance to the session? Otherwise if you issue a session.commit() in the calling code, nothing will happen as the new instance isn't added to the session.
– CadentOrange
May 22 '13 ...
Hashing a file in Python
...is the maximum of the physical block (traditionally 512 bytes or 4KiB with newer disks) and the systems page size (4KiB on many system, other common choices: 8KiB and 64 KiB). Then you basically do some benchmarking and/or look at published benchmark results and related work (e.g. check what current...
WebView link click open default browser
... case someone else needs it.
Source (from sven)
webView.setWebViewClient(new WebViewClient(){
public boolean shouldOverrideUrlLoading(WebView view, String url) {
if (url != null && (url.startsWith("http://") || url.startsWith("https://"))) {
view.getContext().startA...
Understanding $.proxy() in jQuery
... // In this function, "this" is our DOM element.
$(this).addClass('aNewClass');
});
The intention is simple enough. When myElement is clicked, it should get the class aNewClass. Inside the handler this represents the element that was clicked.
But what if we wanted a short delay before addi...
swap fragment in an activity via animation
...lide_in_left, R.anim.slide_out_right);
ft.replace(R.id.fragment_container, newFragment, "fragment");
// Start the animated transition.
ft.commit();
Here is an example of the slide_in_left animation:
<?xml version="1.0" encoding="utf-8"?>
<set>
<translate xmlns:android="http://sch...
Appending to an empty DataFrame in Pandas?
...
note that at least in june 2018 if you'd like the new rows to auto-index themselves, you should write df.append(data, ignore_index=True). Thanks for the great answer!
– Adam B
Jun 15 '18 at 19:04
...
Selecting all text in HTML text input when clicked
...
I know this is old, but the best option is to now use the new placeholder HTML attribute if possible:
<input type="text" id="userid" name="userid" placeholder="Please enter the user ID" />
This will cause the text to show unless a value is entered, eliminating the need to s...
How to open a URL in a new Tab using JavaScript or jQuery? [duplicate]
How to open a URL in new tab instead of new window programatically?
6 Answers
6
...
Simulate CREATE DATABASE IF NOT EXISTS for PostgreSQL?
...d.
To solve these problems you need to use dblink extension which opens a new connection to database server and execute query without entering into transaction. You can reuse connection parameters with supplying empty string.
Below is PL/pgSQL code which fully simulates CREATE DATABASE IF NOT EXIS...
How to add semicolon after method call when inside parameter list in IntelliJ IDEA?
...
Wow, that works! I wonder: is that a new setting, or has that been there for the last 10 years?
– LimaNightHawk
Apr 28 at 13:40
add a com...