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A migration to add unique constraint to a combination of columns

What I need is a migration to apply unique constraint to a combination of columns. i.e. for a people table, a combination of first_name , last_Name and Dob should be unique. ...
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How to handle AccessViolationException

I am using a COM object (MODI) from within my .net application. The method I am calling throws a System.AccessViolationException, which is intercepted by Visual Studio. The odd thing is that I have wrapped my call in a try catch, which has handlers for AccessViolationException, COMException and ev...
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Difference between “module.exports” and “exports” in the CommonJs Module System

...ect with an exports property. exports is a plain JavaScript variable that happens to be set to module.exports. At the end of your file, node.js will basically 'return' module.exports to the require function. A simplified way to view a JS file in Node could be this: var module = { exports: {} }; var...
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What is the meaning of addToBackStack with null parameter?

...s another add() or remove()) and call addToBackStack(), then all changes applied before you call commit() are added to the back stack as a single transaction and the Back button will reverse them all together. The order in which you add changes to a FragmentTransaction doesn't matter, except...
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Always pass weak reference of self into block in ARC?

...in Objective-C. I currently use ARC and I have quite a lot of blocks in my app, currently always referring to self instead of its weak reference. May that be the cause of these blocks retaining self and keeping it from being dealloced ? The question is, should I always use a weak reference of ...
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What is the difference between __dirname and ./ in node.js?

... Is there any way to reference the working directory of the app with fs? For example, I'm trying to load a file from the working directory /movies, but since my module is in a file /custom_modules/, __dirname tries to grab the movie from , /custom_modules/movies –...
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What does “Document-oriented” vs. Key-Value mean when talking about MongoDB vs Cassandra?

...e page's data with a single query and are well suited for content oriented applications (which is why big sites like Facebook or Amazon like them). Other kinds of NoSQL databases include column-oriented stores, graph databases and even object databases. But this goes beyond the question. See also ...
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How do I make calls to a REST api using C#?

...equestHeaders.Accept.Add( new MediaTypeWithQualityHeaderValue("application/json")); // List data response. HttpResponseMessage response = client.GetAsync(urlParameters).Result; // Blocking call! Program will wait here until a response is received or a timeout oc...
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What is the X-REQUEST-ID http header?

...servers down the line, e.g. web server generates the id and forwards it to application server. – isapir Feb 5 '15 at 19:57 1 ...
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What does “Auto packing the repository for optimum performance” mean?

...invocation of git gc --auto. If you let Git finish repacking, this won't happen again for a while. It can indeed take a while, especially if you have a lot of large binary objects, but if it's triggering, then it's a sign that it will probably drastically reduce the amount of disk space taken by th...