constraints

I have problem with unique rows in db table, now it is posible to do that: id | Name | LastName | City ------------------------------------- 1 | John | Moore | London 2 | John | Moore | London when i use UNIQUE attribute in all columns i have errors inserting second Moore even it is different Name :/ how use UNIQUE (or maybe INDEX?) to do something like that in my table in db: id | Name | LastName | City ------------------------------------- 1 | John | Moore | London 2 | Jake | Moore | London 3 | John | Keen | London 4 | John | Moore | London //but good error when inserting the same row Sorry

I believe using autoresizing for orientational changes would be good while managing the UI with Autolayout. So many programmers are recommending against both at the same time,But As far as I understand it should be fine. Because Autoresizingmask is easy to play with. I think autoresizing mask itself turns into constraints actually I believe translatesAutoresizingMaskIntoConstraints Correct me If I am wrong If its okay or not okay can some explain in depth why ? As far as I am aware it is absolutely alright to use both autolayout and autoresizingmasks together. What you don't want to do is add

I have a class that has a Generic type "G" In my class model i have public class DetailElement : ElementDefinition Let's say i have a method like this public void DoSomething<G>(G generic) where G : ElementDefinition { if (generic is DetailElement) { ((DetailElement)generic).DescEN = "Hello people"; //line 1 ////// ElementDefinition element = generic; ((DetailElement)element).DescEN = "Hello again"; //line 3 ////// (generic as DetailElement).DescEN = "Howdy"; //line 5 } else { //do other stuff } } Compiler reports one error in line 1: Cannot convert type 'G' to 'DetailElement' But line 3 works

Maybe someone can help me to solve a problem with Prolog or any constraint programming language. Imagine a table of projects (school projects where pupils do something with their mothers). Each project has one or more children participating. For each child we store its name and the name of its mother. But for each project there is only one cell that contains all mothers and one cell that contains all children. Both cells are not necessarily ordered in the same way. Example: +-----------+-----------+------------+ | | | | | Project | Parents | Children | | | | | +-----------+-----------+--------

I'm creating an ios IPad app that has a UITabBar control positioned at the bottom with 3 MenuItems in it. Normally, when I rotate the device, the tabbar will remain at the bottom in landscape. I'd like to have the TabBar rotate to the left side in Landscape mode, and become a vertical representation. I don't want to create a UIView with buttons if possible, because I'd like the same object to manage both, and I like the convenience of the normal TabBar. My Plan was to detect the device position, and use a UITransform to rotate the TabBar 90 degrees when in landscape. Let's ignore the icon and

I would like display a title and below a image in my view controller. My constraints are : the label can be at 50px of the top of the screen the label can have one or many rows the image can be at 50px of my label the image must have the width of the screen the scroll view must scroll depending on the size of all these elements I have a view controller with a scroll view : -view controller ---view ------scroll view ---------container view ------------label ------------image I want use storyboard and auto layout. I have succeeded to align the label correctly, but I am unable to display the