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Casting vs using the 'as' keyword in the CLR
...bject obj) cil managed
{
// Code size 22 (0x16)
.maxstack 8
IL_0000: ldarg.1
IL_0001: isinst MyClass
IL_0006: brfalse.s IL_0015
IL_0008: ldarg.1
IL_0009: castclass MyClass
IL_000e: pop
IL_000f: ldarg.1
IL_0010: call void [mscorlib]System.Console::WriteL...
MySQL DROP all tables, ignoring foreign keys
... your database like this:
SELECT concat('DROP TABLE IF EXISTS `', table_name, '`;')
FROM information_schema.tables
WHERE table_schema = 'MyDatabaseName';
Note 1: This does not execute the DROP statements, it just gives you a list of them. You will need to cut and paste the output into your SQL...
sqlalchemy: how to join several tables by one query?
...integer primary keys for everything, but whatever):
class User(Base):
__tablename__ = 'users'
email = Column(String, primary_key=True)
name = Column(String)
class Document(Base):
__tablename__ = "documents"
name = Column(String, primary_key=True)
author_email = Column(Strin...
Debugging Package Manager Console Update-Database Seed Method
...ext.Database.GetPendingMigrations() instead.
– stevie_c
Apr 27 '18 at 14:11
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android ellipsize multiline textview
...y of our travel guides, when displaying Suggestions: play.google.com/store/apps/…
– aleb
Apr 13 '12 at 14:22
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When saving, how can you check if a field has changed?
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Essentially, you want to override the __init__ method of models.Model so that you keep a copy of the original value. This makes it so that you don't have to do another DB lookup (which is always a good thing).
class Person(models.Model):
name = models.CharF...
ViewPager with Google Maps API v2: mysterious black view
... Great! It is not perfect, because sometimes while moving pager appears part of the black view. But now it not remains in screen any more. Thanks! (do you have any explanation for this hack?)
– Pepe
Dec 17 '12 at 11:35
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How to print without newline or space?
...ython 2.6 you can either import the print function from Python 3 using the __future__ module:
from __future__ import print_function
which allows you to use the Python 3 solution above.
However, note that the flush keyword is not available in the version of the print function imported from __futu...
Django - filtering on foreign key properties
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Asset.objects.filter( project__name__contains="Foo" )
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How to avoid having class data shared among instances?
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You want this:
class a:
def __init__(self):
self.list = []
Declaring the variables inside the class declaration makes them "class" members and not instance members. Declaring them inside the __init__ method makes sure that a new instance of th...