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How does git store files?
... gc --aggressive uses value 250, which makes it run very slow, but provide extra compression for history data.
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Deleting Row in SQLite in Android
...like this:
//---deletes a particular title---
public boolean deleteTitle(String name)
{
return db.delete(DATABASE_TABLE, KEY_NAME + "=" + name, null) > 0;
}
or
public boolean deleteTitle(String name)
{
return db.delete(DATABASE_TABLE, KEY_NAME + "=?", new String[]{name}) > 0;
}
...
What's wrong with foreign keys?
...documented
Reasons not to use Foreign Keys:
you are making the DB work extra on every CRUD operation because it has to check FK consistency. This can be a big cost if you have a lot of churn
by enforcing relationships, FKs specify an order in which you have to add/delete things, which can lead ...
How to remove all of the data in a table using Django
...
Inside a manager:
def delete_everything(self):
Reporter.objects.all().delete()
def drop_table(self):
cursor = connection.cursor()
table_name = self.model._meta.db_table
sql = "DROP TABLE %s;" % (table_name, )
cursor.execute(sql)
...
How to add test coverage to a private constructor?
...of coverage is to give you a level of confidence, and to suggest areas for extra testing. Artificially calling an otherwise unused constructor doesn't help with either of those points.
– Jon Skeet
Dec 23 '10 at 20:54
...
领域驱动设计系列（五）:事件驱动之异步事件 - 更多技术 - 清泛网 - 专注C/...
...void Handle(TEvent e);
}
public class HeadedEvent:Event
{
public string Name { get; set; }
}
public class GuoJiZhangMotherEventHandler : IEventHandler<HeadedEvent>
{
public void Handle(HeadedEvent e)
{
Console.WriteLine(e.Name+", Are you kidding me?");
}
}
...
How to hide action bar before activity is created, and then show it again?
... super.onPostResume();
getActionBar().hide();
but it may need some extra logic to check if this is the first showing of the Activity.
The idea is to delay a little the hiding of the ActionBar. In a way we let the ActionBar be shown, but then hide it immediately. Thus we go beyond the first ...
Python function overloading
...
What you are asking for is called multiple dispatch. See Julia language examples which demonstrates different types of dispatches.
However, before looking at that, we'll first tackle why overloading is not really what you want in python.
Why Not Overl...
How to compare 2 files fast using .NET?
... if (first.Length != second.Length)
return false;
if (string.Equals(first.FullName, second.FullName, StringComparison.OrdinalIgnoreCase))
return true;
int iterations = (int)Math.Ceiling((double)first.Length / BYTES_TO_READ);
using (FileStream fs1 = ...
What's the best practice for primary keys in tables?
...
Just an extra comment on something that is often overlooked. Sometimes not using a surrogate key has benefits in the child tables. Let's say we have a design that allows you to run multiple companies within the one database (maybe it...