大约有 31,840 项符合查询结果（耗时：0.0287秒） [XML]
find vs find_by vs where
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Use whichever one you feel suits your needs best.
The find method is usually used to retrieve a row by ID:
Model.find(1)
It's worth noting that find will throw an exception if the item is not found by the attribute that you supply. Us...
How do I display an alert dialog on Android?
... to the user that shows "Are you sure you want to delete this entry?" with one button that says 'Delete'. When Delete is touched, it should delete that entry, otherwise nothing.
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NullPointerException accessing views in onCreate()
... {
void exampleFragmentCallback();
}
private Button btnOne;
private Button btnTwo;
private Button btnThree;
private Callback callback;
@Override
public void onAttach(Activity activity)
{
super.onAttach(activity);
try
{
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Conventions for exceptions or error codes
...e code that reacts appropriately to every situation (including the unhappy ones), but that's because writing error-free code is tedious and hard, not because you're passing error codes.
Both Raymond Chen and Joel have made some eloquent arguments against using exceptions for everything.
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How to count the number of occurrences of an element in a List
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It was introduced in JDK 5 (although no one uses a version before that so it doesn't matter) docs.oracle.com/javase/8/docs/technotes/guides/collections/…
– Minion Jim
Mar 2 '19 at 15:49
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Understanding reference counting with Cocoa and Objective-C
...to have a look at Objective-C and Cocoa with a view to playing with the iPhone SDK. I'm reasonably comfortable with C's malloc and free concept, but Cocoa's references counting scheme has me rather confused. I'm told it's very elegant once you understand it, but I'm just not over the hump yet.
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Are lists thread-safe?
.... For example:
L[0] += 1
is not guaranteed to actually increase L[0] by one if another thread does the same thing, because += is not an atomic operation. (Very, very few operations in Python are actually atomic, because most of them can cause arbitrary Python code to be called.) You should use Qu...
Search code inside a Github project
...ore permissive and the dreaded "Invalid search query. Try quoting it." is gone when using the default search selector "Everything":)
(I suppose we can all than Tim Pease, which had in one of his objectives "hacking on improved search experiences for all GitHub properties", and I did mention this St...
What's a Good Javascript Time Picker? [closed]
What's a good time picker for jquery or standalone js? I would like something like google uses in their calendar where it has a drop down of common times in 15min intervals or lets you manually type in a time and it validates it.
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What database does Google use?
... resources without any reconfiguration
each table has multiple dimensions (one of which is a field for time, allowing versioning)
tables are optimized for GFS (Google File System) by being split into multiple tablets - segments of the table as split along a row chosen such that the tablet will be ~2...