大约有 36,010 项符合查询结果（耗时：0.0599秒） [XML]
What's the recommended approach to resetting migration history using Django South?
...the baseline and start a fresh set of migrations. I've reviewed the South documentation , done the usual Google/Stackoverflow searching (e.g. "django south (reset OR delete OR remove) migration history") and haven't found anything obvious.
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PSQLException: current transaction is aborted, commands ignored until end of transaction block
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I got this error using Java and PostgreSQL doing an insert on a table. I will illustrate how you can reproduce this error:
org.postgresql.util.PSQLException: ERROR:
current transaction is aborted, commands ignored until end of transaction block
Summary:
The reason ...
How to delete history of last 10 commands in shell?
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If you do this with vim you may find your deletion history in ~/.viminfo so be sure to remove that too!
– waltwood
Jul 22 '15 at 22:39
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How do you query for “is not null” in Mongo?
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This will return all documents with a key called "IMAGE URL", but they may still have a null value.
db.mycollection.find({"IMAGE URL":{$exists:true}});
This will return all documents with both a key called "IMAGE URL" and a non-null value.
db.my...
Echo a blank (empty) line to the console from a Windows batch file [duplicate]
When outputting status messages to the console from a Windows batch file, I want to output blank lines to break up the output. How do I do this?
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Disable back button in android
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Override the onBackPressed method and do nothing if you meant to handle the back button on the device.
@Override
public void onBackPressed() {
if (shouldAllowBack()) {
super.onBackPressed();
} else {
doSomething();
}
}
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Abstract functions in Swift Language
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There no concept of abstract in Swift (like Objective-C) but you can do this :
class BaseClass {
func abstractFunction() {
preconditionFailure("This method must be overridden")
}
}
class SubClass : BaseClass {
override func abstractFunction() {
// Override
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How do you 'redo' changes after 'undo' with Emacs?
This article says that "Emacs has redo because you can reverse direction while undoing, thereby undoing the undo".
9 Answe...
What is the difference between integration and unit tests?
...ence, when a unit test for a method implementing some feature is green, it does not mean the feature is working.
Say you have a method somewhere like this:
public SomeResults DoSomething(someInput) {
var someResult = [Do your job with someInput];
Log.TrackTheFactYouDidYourJob();
return someR...
How do I create a custom Error in JavaScript?
For some reason it looks like constructor delegation doesn't work in the following snippet:
23 Answers
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