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How to drop unique in MySQL?
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Note that you may not be able to drop a key like this if a foreign key to the email column exists (error 150) . To get this to work, drop the foreign key first, then drop the index, and recreate the foreign key afterwards. e.g ALTER TABLE fuinfo DROP foreign key fk_name_for_em...
What is the difference between attribute and property? [closed]
...s (and in normal English usage) the terms mean the same thing.
In the specific context of HTML / Javascript the terms get confused because the HTML representation of a DOM element has attributes (that being the term used in XML for the key/value pairs contained within a tag) but when represented a...
How to use SCNetworkReachability in Swift
...ue to changes in the Swift language, which made it a bit confusing. I have now rewritten it and removed everything which refers to Swift 1.x. The older code can
be found in the edit history if somebody needs it.)
This is how you would do it in Swift 2.0 (Xcode 7):
import SystemConfiguration
func ...
Wait for a process to finish
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Who would have known that tail would do this.
– ctrl-alt-delor
Jul 30 '17 at 15:06
8
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How can we generate getters and setters in Visual Studio?
...also has a feature that will generate a Property from a private variable.
If you right-click on a variable, in the context menu that pops up, click on the "Refactor" item, and then choose Encapsulate Field.... This will create a getter/setter property for a variable.
I'm not too big a fan of this ...
How to check if a table contains an element in Lua?
Is there a method for checking if a table contains a value ? I have my own (naive) function, but I was wondering if something "official" exists for that ? Or something more efficient...
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ruby 1.9: invalid byte sequence in UTF-8
...?)"/i) instead of nokogiri/hpricot (major speedup). The problem is that I now receive a lot of " invalid byte sequence in UTF-8 " errors.
From what I understood, the net/http library doesn't have any encoding specific options and the stuff that comes in is basically not properly tagged.
What ...
How do I check if a list is empty?
For example, if passed the following:
27 Answers
27
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Only read selected columns
...ep", "Oct", "Nov", "Dec"), class = "data.frame",
row.names = c(NA, -3L))
If the number of columns is not known beforehand, the utility function count.fields will read through the file and count the number of fields in each line.
## returns a vector equal to the number of lines in the file
count.f...
From inside of a Docker container, how do I connect to the localhost of the machine?
...ker host has the IP address 172.17.42.1 on the docker0 network interface.
Now start a new container and get a shell on it: docker run --rm -it ubuntu:trusty bash and within the container type ip addr show eth0 to discover how its main network interface is set up:
root@e77f6a1b3740:/# ip addr show ...