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Observer Design Pattern vs “Listeners”
It seems to me that the Observer design pattern as described in GOF is really the same thing as Listeners found in various toolkits. Is there a difference between the concepts, or are Listeners and Observers really the same thing.
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Return 0 if field is null in MySQL
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Use IFNULL:
IFNULL(expr1, 0)
From the documentation:
If expr1 is not NULL, IFNULL() returns expr1; otherwise it returns expr2. IFNULL() returns a numeric or string value, depending on the context in which it is used.
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How to output messages to the Eclipse console when developing for Android
How can I print messages (like a flag) to the Eclipse console (or log) when developing and debugging an Android app
5 Answe...
How to add local jar files to a Maven project?
...istered under e.g → com.google.code
<artifact-id>: the artifact name for the file e.g → kaptcha
<version>: the version of the file e.g → 2.3
<packaging>: the packaging of the file e.g. → jar
Reference
Maven FAQ: I have a jar that I want to put into my local repository...
Why would one declare a Java interface method as abstract?
...e based on an existing class. The dialog box offered to create all the new methods of the new interface as "abstract" methods.
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Why does Google prepend while(1); to their JSON responses?
...as a URL like mail.google.com/json?action=inbox which returns the first 50 messages of your inbox in JSON format. Evil websites on other domains can't make AJAX requests to get this data due to the same-origin policy, but they can include the URL via a <script> tag. The URL is visited with you...
JSON Naming Convention (snake_case, camelCase or PascalCase) [closed]
...ted by underscore, aka snake_case , but can it be used PascalCase or camelCase as well?
7 Answers
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ModelState.AddModelError - How can I add an error that isn't for a property?
...ies, as usual you call:
ModelState.AddModelError(string key, string errorMessage);
but use an empty string for the key:
ModelState.AddModelError(string.Empty, "There is something wrong with Foo.");
The error message will present itself in the <%: Html.ValidationSummary() %> as you'd exp...
Visual Studio Disabling Missing XML Comment Warning
I have a project with over 500 Missing XML Comment warnings. I know I can remove the XML Comment feature, or paste empty comment snippets everywhere, but I'd prefer a generic solution where I can make one change that disables all warnings of this type.
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Get the current file name in gulp.src()
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I'm not sure how you want to use the file names, but one of these should help:
If you just want to see the names, you can use something like gulp-debug, which lists the details of the vinyl file. Insert this anywhere you want a list, like so:
var gulp = require('...