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Hidden Features of MySQL
I've been working with Microsoft SQL Server with many years now but have only just recently started to use MySQL with my web applications, and I'm hungry for knowledge.
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What are the calling conventions for UNIX & Linux system calls (and user-space functions) on i386 an
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User-level applications use as integer registers for passing the
sequence %rdi, %rsi, %rdx, %rcx,
%r8 and %r9. The kernel interface uses %rdi, %rsi, %rdx, %r10, %r8 and %r9.
A system-call is done via the syscall instruction. This clobbers %rcx and %r11 as well as the %rax return v...
Generating v5 UUID. What is name and namespace?
...Name and namespace can be used to create a hierarchy of (very probably) unique UUIDs.
Roughly speaking, a type 3 or type 5 UUID is generated by hashing together a namespace identifier with a name. Type 3 UUIDs use MD5 and type 5 UUIDs use SHA1. Only 128-bits are available and 5 bits are used to spe...
How to “perfectly” override a dict?
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You can write an object that behaves like a dict quite easily with ABCs (Abstract Base Classes) from the collections.abc module. It even tells you if you missed a method, so below is the minimal version that shuts the ABC up.
from collections.abc import MutableMapping
c...
How can I sort arrays and data in PHP?
...ion takes two elements and must return 0 if these elements are considered equal, a value lower than 0 if the first value is lower and a value higher than 0 if the first value is higher. That's all that's needed:
function cmp(array $a, array $b) {
if ($a['foo'] < $b['foo']) {
return -1...
Monad in plain English? (For the OOP programmer with no FP background)
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UPDATE: This question was the subject of an immensely long blog series, which you can read at Monads — thanks for the great question!
In terms that an OOP programmer would understand (without any functional programming background), ...
Regular expression to match URLs in Java
...se at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License fo...
Fastest way to determine if an integer's square root is an integer
...m looking for the fastest way to determine if a long value is a perfect square (i.e. its square root is another integer):
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Objective-C categories in static library
...ches and experiments.
Problem was caused by (citation from apple Technical Q&A QA1490 https://developer.apple.com/library/content/qa/qa1490/_index.html):
Objective-C does not define linker
symbols for each function (or method,
in Objective-C) - instead, linker
symbols are only generated for eac...
Android studio: new project vs new module
... I would have thought these things would be left to the Module. If these questions are just so the appropriate support libs are added to the 'Project' then I understand, but I also see these same things when creating a new module. Quite confusing.
– Scott Naef
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