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Swapping column values in MySQL
...work:
UPDATE swap_test s1, swap_test s2 SET s1.x=s1.y, s1.y=s2.x WHERE s1.id=s2.id;
Essentially, the 1st table is the one getting updated and the 2nd one is used to pull the old data from.
Note that this approach requires a primary key to be present.
This is my test schema:
CREATE TABLE `swap_t...
Aligning a float:left div to center?
...
you may need to add vertical-align:middle while using display:inline-block.
– ibsenv
May 24 '15 at 10:59
...
Javascript/jQuery: Set Values (Selection) in a multiple Select
...lue='" + e + "']").prop("selected", true);
});
Working Example http://jsfiddle.net/McddQ/1/
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Is there a print_r or var_dump equivalent in Ruby / Ruby on Rails?
...1
updated_at: 2009-05-26 22:46:29.501245
current_login_ip: 127.0.0.1
id: "1"
current_login_at: 2009-05-24 20:20:46.627254
login_count: "1"
last_login_ip:
last_login_at:
login: admin
attributes_cache: {}
=> nil
>>
If you want to just preview some string contents, try us...
Biggest advantage to using ASP.Net MVC vs web forms
...of ASP.net MVC are:
Enables the full control over the rendered HTML.
Provides clean separation of concerns(SoC).
Enables Test Driven Development (TDD).
Easy integration with JavaScript frameworks.
Following the design of stateless nature of the web.
RESTful urls that enables SEO.
No ViewState and ...
Node / Express: EADDRINUSE, Address already in use - Kill server
... currently running stacks here and there) it makes no sense to put that inside the exit event...
On crash, do process.on('uncaughtException', ..) and on kill do process.on('SIGTERM', ..)
That being said, SIGTERM (default kill signal) lets the app clean up, while SIGKILL (immediate termination) won...
Why do some websites add “Slugs” to the end of URLs? [closed]
...ssing" I think the minority is extremely tiny.
– eyelidlessness
Jun 2 '09 at 15:59
4
@eyelidlessn...
Jackson - Deserialize using generic class
... the class as a parameter during runtime. Like this public <T> void deSerialize(Class<T> clazz { ObjectMapper mapper = new ObjectMapper(); mapper.readValue(jsonString, new TypeReference<Json<T>>() {}); }
– gnjago
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Show or hide element in React
... around with React.js for the first time and cannot find a way to show or hide something on a page via click event. I am not loading any other library to the page, so I am looking for some native way using the React library. This is what I have so far. I would like to show the results div when th...
Rails 4 - Strong Parameters - Nested Objects
... the other hand if you want nested of multiple objects then you wrap it inside a hash… like this
params.require(:foo).permit(:bar, {:baz => [:x, :y]})
Rails actually have pretty good documentation on this: http://api.rubyonrails.org/classes/ActionController/Parameters.html#method-i-permit
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