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ERROR: Error 1005: Can't create table (errno: 121)
...un an ALTER TABLE with certain constraint names.
According to the docs at http://dev.mysql.com/doc/refman/5.7/en/innodb-troubleshooting-datadict.html , you can search for these orphan tables with:
SELECT * FROM INFORMATION_SCHEMA.INNODB_SYS_TABLES WHERE NAME LIKE '%#sql%';
The version I was work...
Call UrlHelper in models in ASP.NET MVC
...ul tip, in any ASP.NET application, you can get a reference of the current HttpContext
HttpContext.Current
which is derived from System.Web. Therefore, the following will work anywhere in an ASP.NET MVC application:
UrlHelper url = new UrlHelper(HttpContext.Current.Request.RequestContext);
url.A...
Passing parameters in rails redirect_to
...
You can't redirect with a POST. From the HTTP 1.1 docs under the 3xx definitions: "The action required MAY be carried out by the user agent without interaction with the user if and only if the method used in the second request is GET or HEAD." Expand on what you're...
Catch a thread's exception in the caller thread in Python
...ld thread, and it is in its own stack. One way I can think of right now to communicate this information to the parent thread is by using some sort of message passing, so you might look into that.
Try this on for size:
import sys
import threading
import Queue
class ExcThread(threading.Thread):
...
Rails 4 multiple image or file upload using carrierwave
...ke a look at CarrierWave's documentation, this is actually very easy now.
https://github.com/carrierwaveuploader/carrierwave/blob/master/README.md#multiple-file-uploads
I will use Product as the model I want to add the pictures, as an example.
Get the master branch Carrierwave and add it to your...
Calculate age given the birth date in the format YYYYMMDD
...y the most accurate, as it doesn't rely on the time of day.
Benchmarks: http://jsperf.com/birthday-calculation/15
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Struct like objects in Java
...ct), then it's appropriate to make the class's instance variables public.
http://www.oracle.com/technetwork/java/javase/documentation/codeconventions-137265.html#177
http://en.wikipedia.org/wiki/Plain_old_data_structure
http://docs.oracle.com/javase/1.3/docs/guide/collections/designfaq.html#28
...
How do I find the location of Python module sources?
...memodule.c
You can also find the latest Mercurial version on the web at
https://hg.python.org/cpython/file/tip/Modules/_datetimemodule.c
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腾讯Tencent开源框架介绍（持续更新） - 开源 & Github - 清泛网 - 专注C/C++及内核技术
...些探索，有类似需求的可以参考一下。GitHub：https: github com Tencent官网：https: openso 腾讯开源了很多自己内部久经考验的框架代码，这里对C++及大前端相关的开源框架进行一些探索，有类似需求的可以参考一下。
GitHub：https://g...
What is the difference between linear regression and logistic regression?
...an 0, or even bigger than
1, logistic regression was introduced.
Source: http://gerardnico.com/wiki/data_mining/simple_logistic_regression
Outcome
In linear regression, the outcome (dependent variable) is continuous.
It can have any one of an infinite number of possible values.
In logistic re...