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How do you pass arguments to define_method?
...t:
Summary article: https://blog.eq8.eu/til/metaprogramming-ruby-examples.html
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Is it possible to roll back CREATE TABLE and ALTER TABLE statements in major SQL databases?
...at transaction."
https://dev.mysql.com/doc/refman/5.7/en/implicit-commit.html
Tried a few different ways and it simply won't roll back..
Work around is to simply set a failure flag and do "drop table tblname" if one of the queries failed..
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Difference between Destroy and Delete
...ctiveRecord::Callbacks: api.rubyonrails.org/classes/ActiveRecord/Callbacks.html. One such callback is model#before_destroy which can be used to halt the final destroy() call under certain conditions.
– Todd
Mar 23 '16 at 14:39
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Django Cookies, how can I set them?
...rint(request.session['how_many_visits'])
return render(request, 'home.html', {})
If you keep visiting the page over and over, you'll see the value start incrementing up from 1 until you clear your cookies, visit on a new browser, go incognito, or do anything else that sidesteps Django's Sessi...
PDO MySQL: Use PDO::ATTR_EMULATE_PREPARES or not?
... it is cacheable..." dev.mysql.com/doc/refman/5.1/en/query-cache-in-select.html
– Andrew Ensley
May 4 '12 at 17:25
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What does the restrict keyword mean in C++?
... it does: https://gcc.gnu.org/onlinedocs/gcc-5.1.0/gcc/Restricted-Pointers.html with syntax:
int &__restrict__ rref
There is even a version for this of member functions:
void T::fn () __restrict__
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How can I decompress a gzip stream with zlib?
...ts = zlib.MAX_WBITS | 16
See documentation in http://www.zlib.net/manual.html#Advanced (section inflateInit2)
examples
test data:
>>> deflate_compress = zlib.compressobj(9, zlib.DEFLATED, -zlib.MAX_WBITS)
>>> zlib_compress = zlib.compressobj(9, zlib.DEFLATED, zlib.MAX_WBITS)
&...
Change color of PNG image via CSS?
... means multiplying both input colors together.
Note: This only works with HTML5 since this is using inline SVG. But I think you might be able to make this work with older browser by putting SVG in a separate file. I haven't tried that approach yet.
Here's the snippet:
<svg xmlns="http://www...
@RequestBody and @ResponseBody annotations in Spring
...rectly to the response body versus view resolution
and rendering with an HTML template.
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When do Java generics require
...to direct you to http://www.angelikalanger.com/GenericsFAQ/JavaGenericsFAQ.html -- she does an amazing job.
The basic idea is that you use
<T extends SomeClass>
when the actual parameter can be SomeClass or any subtype of it.
In your example,
Map<String, Class<? extends Serializabl...