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Foreign key constraints: When to use ON UPDATE and ON DELETE
...atabase schema using MySQL Workbench, which is pretty cool because you can do diagrams and it converts them :P
3 Answers
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Why no love for SQL? [closed]
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This is partly subjective. So this is my opinion:
SQL has a pseudo-natural-language style. The inventors believed that they can create a language just like English and that database queries will be very simple. A terrible mistake. SQL is very hard to understand except in trivial cases.
S...
When should you branch?
...s:
Feature Branch: If a particular feature is disruptive enough that you don't want the entire development team to be affected in its early stages, you can create a branch on which to do this work.
Fixes Branch: While development continues on the main trunk, a fixes branch can be created to hold t...
Why doesn't Dijkstra's algorithm work for negative weight edges?
...nstraint on positive numbers - the above assumption is not true.
Since we do "know" each vertex which was "closed" is minimal - we can safely do the relaxation step - without "looking back". If we do need to "look back" - Bellman-Ford offers a recursive-like (DP) solution of doing so.
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How to define Gradle's home in IDEA?
... gradle script to print your GRADLE_HOME directory.
task getHomeDir {
doLast {
println gradle.gradleHomeDir
}
}
and name it build.gradle.
Then run it with:
gradle getHomeDir
If you installed with homebrew, use brew info gradle to find the base path (i.e. /usr/local/Cellar/grad...
Retrieving a List from a java.util.stream.Stream in Java 8
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What you are doing may be the simplest way, provided your stream stays sequential—otherwise you will have to put a call to sequential() before forEach.
[later edit: the reason the call to sequential() is necessary is that the code as ...
CSS: Change image src on img:hover
...With only html and css, its not posible to change the src of image. If you do replace the img tag with div tag, then you might be able to change the image that is set as the background as like
div {
background: url('http://dummyimage.com/100x100/000/fff');
}
div:hover {
background: url('ht...
Making git diff --stat show full file path
On doing git diff --stat some files are listed with full path from repository base but some files are listed as:
7 Answer...
SignalR: Why choose Hub vs. Persistent Connection?
...age type in the payload (see Raw sample) but hubs gives you the ability to do RPC over a connection (lets you call methods on on the client from the server and from the server to the client). Another big thing is model binding. Hubs allow you to pass strongly typed parameters to methods.
The examp...
How to create a simple map using JavaScript/JQuery [duplicate]
...plementation, read here for more info: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map
var map = new Object(); // or var map = {};
map[myKey1] = myObj1;
map[myKey2] = myObj2;
function get(k) {
return map[k];
}
//map[myKey1] == get(myKey1);
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