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Possible to do a MySQL foreign key to one of two possible tables?
..., you can designate which target table is referenced.
CREATE TABLE popular_places (
user_id INT NOT NULL,
place_id INT NOT NULL,
place_type VARCHAR(10) -- either 'states' or 'countries'
-- foreign key is not possible
);
There's no way to model Polymorphic Associations using SQL constraint...
What are the real-world strengths and weaknesses of the many frameworks based on backbone.js? [close
...yApp.module("MyModule", function(MyModule, MyApp, Backbone, Marionette, $, _){
// your module code goes here
});
(No blog post available for this, yet)
Incremental Use
This is one of the core philosophies that I bake in to every part of Marionette that I can: no "all-or-nothing" requirement ...
What characters can be used for up/down triangle (arrow without stem) for display in HTML?
...ler font.
More Unicode arrows are at:
http://en.wikipedia.org/wiki/Arrow_%28symbol%29#Arrows_in_Unicode
http://en.wikipedia.org/wiki/Geometric_Shapes
Lastly, these arrows are not ASCII, including ↑ and ↓: they are Unicode.
...
Python base64 data decode
...
import base64
coded_string = '''Q5YACgA...'''
base64.b64decode(coded_string)
worked for me. At the risk of pasting an offensively-long result, I got:
>>> base64.b64decode(coded_string)
2: 'C\x96\x00\n\x00\x00\x00\x00C\x96\x00\x1b\x0...
What is a correct mime type for docx, pptx etc?
...mage/vnd.fst", "fvt": "video/vnd.fvt", "fbs": "image/vnd.fastbidsheet", "fe_launch": "application/vnd.denovo.fcselayout-link", "f4v": "video/x-f4v", "flv": "video/x-flv", "fpx": "image/vnd.fpx", "npx": "image/vnd.net-fpx", "flx": "text/vnd.fmi.flexstor", "fli": "video/x-fli", "ftc": "application/vnd...
Socket 错误返回码详解 - C/C++ - 清泛网 - 专注C/C++及内核技术
...etwork is unreachable
WSAETIMEDOUT (10060) Connection timed out
WSAHOST_NOT_FOUND (11001) Host not found
WSASYSNOTREADY (10091) Network sub-system is unavailable
WSANOTINITIALISED (10093) WSAStartup() not performed
WSANO_DATA (11004) Valid name, no data of that type
WSANO_RECOVERY (11003...
What is move semantics?
...ng
{
char* data;
public:
string(const char* p)
{
size_t size = std::strlen(p) + 1;
data = new char[size];
std::memcpy(data, p, size);
}
Since we chose to manage the memory ourselves, we need to follow the rule of three. I am going to defer writing the assi...
List of All Locales and Their Short Codes?
...st handled by using MessageFormatter::formatMessage, or its one-off, msgfmt_format_message, as in msgfmt_format_message('ar-ye', '{0,date,medium}', array('2017-01-27)), which will produce ٢٧/٠١/٢٠١٧. For times, where using values stored as UTC, it is probably better to use the IntlDate...
【精心整理】【实用】visual C++中最常用的类与API函数 - C/C++ - 清泛网 -...
...rray类：该类支持动态的字节数组
CCmdUI类：该类仅用于ON_UPDATE_COMMAND_UI处理函数中
CColorDialog类：封装标准颜色对话框
CDC类：定义设备环境对象类
CDialog类：所有对话框（模态或非模态）的基类
CDocument类：提供用户定义的...
Is CSS Turing complete?
... none !important; }
<p><a href="http://en.wikipedia.org/wiki/Rule_110">Rule 110</a> in (webkit) CSS, proving Turing-completeness.</p>
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