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How to define two fields “unique” as couple
Is there a way to define a couple of fields as unique in Django?
2 Answers
2
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Fragment onCreateView and onActivityCreated called twice
I'm developing an app using Android 4.0 ICS and fragments.
5 Answers
5
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How to change href of tag on button click through javascript
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Without having a href, the click will reload the current page, so you need something like this:
<a href="#" onclick="f1()">jhhghj</a>
Or prevent the scroll like this:
<a href="#" onclick="f1(); return false;">jhhgh...
How to do SELECT COUNT(*) GROUP BY and ORDER BY in Django?
I'm using a transaction model to keep track all the events going through the system
2 Answers
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How do I typedef a function pointer with the C++11 using syntax?
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It has a similar syntax, except you remove the identifier from the pointer:
using FunctionPtr = void (*)();
Here is an Example
If you want to "take away the uglyness", try what Xeo suggested:
#include <type_traits>
using FunctionPtr = std::add_pointer<void()>::type;
And her...
Add margin between a RadioButton and its label in Android?
...dd a little bit of space between a RadioButton and the label while still using Android's built-in components? By default the text looks a little scrunched.
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How does JPA orphanRemoval=true differ from the ON DELETE CASCADE DML clause
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orphanRemoval has nothing to do with ON DELETE CASCADE.
orphanRemoval is an entirely ORM-specific thing. It marks "child" entity to be removed when it's no longer referenced from the "parent" entity, e.g. when you remove the child entity from the...
ORA-00054: resource busy and acquire with NOWAIT specified or timeout expired
Why am I getting this database error when I update a table?
14 Answers
14
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How to manually set an authenticated user in Spring Security / SpringMVC
... a new user submits a 'New account' form, I want to manually log that user in so they don't have to login on the subsequent page.
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NOT IN vs NOT EXISTS
...cution plans may be the same at the moment but if either column is altered in the future to allow NULLs the NOT IN version will need to do more work (even if no NULLs are actually present in the data) and the semantics of NOT IN if NULLs are present are unlikely to be the ones you want anyway.
When...