composite

I'm writing a simple 2D game engine using the HTML5 canvas. I've come to adding a lighting engine. Each light source has a radius value and an intensity value (0-1, eg 1 would be very bright). There's also an ambient light value that is used to light everything else in the world that isn't near a light source (0-1, eg 0.1 would be moonlight). The process of lighting is done on a separate canvas above the main canvas: For each light source, a radial gradient is drawn at that position with the same radius as the light source. The gradient is given two stops: the center is black with an alpha of

I am trying to find out if anyone has any experience or ideas of using MEF (Managed Extensible Framework (Microsoft's new plugin framework) with ASP.NET MVC. I need to create a standard ASP.NET MVC, which I have. But I need to offer additional functionality i.e. Views and Controllers, etc, depending on if I add a plugin. It doesn't need to be dynamically compiled i.e. source code... but a DLL that i put into the system.. Is there any way to dynamically load a DLL when the app starts, and then MERGE a VIEWS and CONTROLLERS with the main system? I don't know if i am on the right track here. Then

I've created composite indexes ( indices for you mathematical folk) on tables before with an assumption of how they worked. I was just curious if my assumption is correct or not. I assume that when you list the order of columns for the index, you are also specifying how the indexes will be grouped. For instance, if you have columns a , b , and c , and you specify the index in that same order a ASC , b ASC , and c ASC then the resultant index will essentially be many indexes for each "group" in a . Is this correct? If not, what will the resultant index actually look like? Composite indexes work

I'm executing the following query SELECT COUNT(*) FROM table WHERE field1='value' AND (field2 >= 1000 OR field3 >= 2000) There is one index over field1 and another composited over field2&field3. I see MySQL always selects the field1 index and then makes a join using the other two fields which is quite bad because it needs to join 146.000 rows. Suggestions on how to improve this? Thanks (EDIT AFTER TRYING SOLUTION PROPOSED) Based in the solution proposed I've seen this on Mysql when playing with this. SELECT COUNT(*) FROM (SELECT * FROM table WHERE columnA = value1 UNION SELECT * FROM table

I have this simple model of Author - Books and can't find a way to make firstName and lastName a composite key and use it in relation. Any ideas? from sqlalchemy import create_engine, ForeignKey, Column, String, Integer from sqlalchemy.orm import relationship, sessionmaker from sqlalchemy.ext.declarative import declarative_base Base = declarative_base() engine = create_engine('mssql://user:pass@library') engine.echo = True session = sessionmaker(engine)() class Author(Base): __tablename__ = 'authors' firstName = Column(String(20), primary_key=True) lastName = Column(String(20), primary_key