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Ruby on Rails: How do I add a not null constraint to an existing column using a migration?
...eUploader: {
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Who is listening on a given TCP port on Mac OS X?
... -P flag is for displaying raw port numbers instead of resolved names like http, ftp or more esoteric service names like dpserve, socalia.
See the comments for more options.
For completeness, because frequently used together:
To kill the PID:
kill -9 <PID>
# kill -9 60401
...
What is Python buffer type for?
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How to log request and response body with Retrofit-Android?
...by Marcus Pöhls
Logging In Retrofit 2
Retrofit 2 completely relies on OkHttp for any network operation. Since OkHttp is a peer dependency of Retrofit 2, you won’t need to add an additional dependency once Retrofit 2 is released as a stable release.
OkHttp 2.6.0 ships with a logging interceptor...
Update statement with inner join on Oracle
...bonus_eligible = 'N') t
set t.bonus = 0;
See this link for more details.
http://geekswithblogs.net/WillSmith/archive/2008/06/18/oracle-update-with-join-again.aspx.
Also, ensure that there are primary keys on all the tables you are joining.
...
When should I use semicolons in SQL Server?
...rectly, it will be a requirement to use semicolons to end TSQL statements.
http://msdn.microsoft.com/en-us/library/ms143729%28v=sql.120%29.aspx
EDIT:
I found a plug-in for SSMS 2008R2 that will format your script and add the semicolons. I think it is still in beta though...
http://www.tsqltidy.com...
invalid byte sequence for encoding “UTF8”
...it from a different source, consult the list of character encodings here:
http://www.postgresql.org/docs/8.3/static/multibyte.html
If you're getting it from a Mac, you may have to run it through the "iconv" utility first to convert it from MacRoman to UTF-8.
...
What does void* mean and how to use it?
...
You can have a look at this article about pointers http://www.cplusplus.com/doc/tutorial/pointers/ and read the chapter : void pointers.
This also works for C language.
The void type of pointer is a special type of pointer. In C++, void
represents the absence of type, ...
Why does the CheckBoxFor render an additional input tag, and how can I get the value using the FormC
...
Have a look here:
http://forums.asp.net/t/1314753.aspx
This isn't a bug, and is in fact the same approach that both Ruby on
Rails and MonoRail use.
When you submit a form with a checkbox, the value is only posted if
the checkbox i...
Reading/parsing Excel (xls) files with Python
...
You can choose any one of them http://www.python-excel.org/
I would recommended python xlrd library.
install it using
pip install xlrd
import using
import xlrd
to open a workbook
workbook = xlrd.open_workbook('your_file_name.xlsx')
open sheet ...