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Undo changes in entity framework entities
...ontext.Entry(entity).Reload();
Accroding to MSDN:
Reloads the entity from the database overwriting any property values with values from the database. The entity will be in the Unchanged
state after calling this method.
Note that reverting through the request to database has some drawbacks:...
Django - “no module named django.core.management”
I get the following error when trying to run Django from the command line.
21 Answers
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How do I execute a program from Python? os.system fails due to spaces in path
I have a Python script that needs to execute an external program, but for some reason fails.
10 Answers
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Are PHP include paths relative to the file or the calling code?
...tion of A.PHP? That is, does it matter which file the include is called from, or only what the current working directory is- and what determines the current working directory?
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Why does Twitter Bootstrap Use Pixels for Font Size?
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knowledge of what the computed value is. We'll probably try to steer
away from this in the future.
In the future, we'll likely use ems for type sizing, perhaps rems even, but not for anything else. This is also debatable on font sizes for inputs and the like. It's just not how folks build pixel per...
Android map v2 zoom to show all the markers
... and keep all markers in view? In the earlier version this can be achieved from zoomToSpan() but in v2 I have no idea how about doing that. Further, I know the radius of the circle that needs to be visible.
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What is a NullPointerException, and how do I fix it?
...ds/tools can be used to determine the cause so that you stop
the exception from causing the program to terminate prematurely?
Sonar with find bugs can detect NPE.
Can sonar catch null pointer exceptions caused by JVM Dynamically
Now Java 14 has added a new language feature to show the root cause of...
Getting command-line password input in Python
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Use getpass.getpass():
from getpass import getpass
password = getpass()
An optional prompt can be passed as parameter; the default is "Password: ".
Note that this function requires a proper terminal, so it can turn off echoing of typed character...
SparseArray vs HashMap
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//but can be copied from Android source code
In terms of memory, here is an example of SparseIntArray vs HashMap<Integer, Integer> for 1000 elements:
SparseIntArray:
class SparseIntArray {
int[] keys;
int[] values;
int si...
What exception classes are in the standard C++ library
...ull pointer
std::bad_weak_ptr <memory> constructing a shared_ptr from a bad weak_ptr
std::logic_error <stdexcept> errors detectable before the program executes
std::domain_error <stdexcept> parameter outside the valid range
std::future_error <future> v...