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What is the difference between IEqualityComparer and IEquatable?
...s of Person at some point you might require to test equality of two people based on their age. In that case you can do:
class Person
{
public int Age;
}
class AgeEqualityTester : IEqualityComparer<Person>
{
public bool Equals(Person x, Person y)
{
return x.Age == y.Age;
...
generate model using user:references vs user_id:integer
...ly put the line in the Micropost model
class Micropost < ActiveRecord::Base
belongs_to :user
end
class User < ActiveRecord::Base
has_many :microposts
end
the keywords belongs_to and has_many determine the relationship between these models and declare user_id as a foreign key to User mo...
What to do on TransactionTooLargeException
...Delving into the source code of android one finds these lines:
frameworks/base/core/jni/android_util_Binder.cpp:
case FAILED_TRANSACTION:
ALOGE("!!! FAILED BINDER TRANSACTION !!!");
// TransactionTooLargeException is a checked exception, only throw from certain methods.
// FIXME: Trans...
How do I get an HttpContext object from HttpContextBase in ASP.NET MVC 1?
...ed to get an instance of HttpContext given a reference to an HttpContextBase object. I can't use HttpContext.Current because I need this to work asynchronously as well ( HttpContext.Current returns null during an asynchronous request). I'm aware of HttpContextWrapper , but goes the wrong w...
Can I protect against SQL injection by escaping single-quote and surrounding user input with single-
...ne ;) )
https://www.owasp.org/images/d/d4/OWASP_IL_2007_SQL_Smuggling.pdf (based on the previous paper, which is no longer available)
Point is, any blacklist you do (and too-permissive whitelists) can be bypassed. The last link to my paper shows situations where even quote escaping can be bypassed...
How to decorate a class?
...rgs, **kwargs):
pass
class FooMeta(type):
def __new__(cls, name, bases, attrs):
attrs['__init__'] = substitute_init
return super(FooMeta, cls).__new__(cls, name, bases, attrs)
class Foo(object):
__metaclass__ = FooMeta
def __init__(self, value1):
pass
R...
SQL parser library for Java [closed]
...
Statement is a base class. A SELECT statement will be of type Query. It contains a QueryBody that has the subclass QuerySpecification. The structure is more complex than you might expect in order to support UNION, TABLE, VALUES, set operati...
Selecting only numeric columns from a data frame
... R's particular quirks, and more straightforward, and robust to use on database-back-ended tibbles:
dplyr::select_if(x, is.numeric)
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Multiple constructors in python? [duplicate]
...to pass in different kinds of argument I would try to avoid the isinstance-based approach mentioned in another answer, instead using keyword arguments. If using just keyword arguments becomes unwieldy you can combine it with classmethods (the bzrlib code likes this approach). This is just a silly ex...
Add margin above top ListView item (and below last) in Android
..."false"/>
android:clipToPadding is an XML attribute of ViewGroup, the base class for layouts and views containers.
The related method call is:
public void setClipToPadding (boolean clipToPadding)
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