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MySQL OPTIMIZE all tables?
...ocked while OPTIMIZE is being performed, which can take a substantial time if the tables hold lots of data. So, during the time a table is being OPTIMIZE'd, no new records can be inserted or deleted. Generally, OPTIMIZE'ing all tables of a production system cannot be considered as a trivial operatio...
When do you use map vs flatMap in RxJava?
....subscribe(userInfo -> {
// get user info and you update ui now
});
As you see, in function flatMap applies, at first I get user id from Response then fetch user info. When two requests are finished, we can do our job such as updating UI or save data into database.
However...
Check if a value is an object in JavaScript
How do you check if a value is an object in JavaScript?
46 Answers
46
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When and why to 'return false' in JavaScript?
...
This is particularly good if you want an AJAX form that submits without reloading the page - but also works by submitting and reloading the page when javascript is not available.
– Dean Rather
May 13 '09 at 1:50
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How to display loading message when an iFrame is loading?
I have an iframe that loads a third party website which is extremely slow to load.
9 Answers
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CSS: Change image src on img:hover
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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: ...
Defining an array of anonymous objects in CoffeeScript
...h the last item ! See my example below..
– Dean Radcliffe
Oct 11 '13 at 19:41
1
@DeanRadcliffe It...
Installing PIL with pip
... of PIL.
https://pypi.python.org/pypi/Pillow/2.2.1
pip install Pillow
If you have both Pythons installed and want to install this for Python3:
python3 -m pip install Pillow
share
|
improve th...
How to get Twitter-Bootstrap navigation to show active link?
... understanding how Twitter Bootstrap does active links for the navigation. If I have a regular navigation like this (with ruby on rails linking):
...
When and why JPA entities should implement Serializable interface?
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This usually happens if you mix HQL and native SQL queries. In HQL, Hibernate maps the types you pass in to whatever the DB understands. When you run native SQL, then you must do the mapping yourself. If you don't, then the default mapping is to ...