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Is there any performance gain in indexing a boolean field?
...e an index, if you have too many records it doesn't use the index anyways.
MySQL not using index when checking = 1 , but using it with = 0
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follo...
Logging uncaught exceptions in Python
...ere is the output with sys.excepthook as seen above:
$ python tb.py
ERROR:root:Unhandled exception: Traceback (most recent call last):
File "tb.py", line 11, in <module>
None()
TypeError: 'NoneType' object is not callable
Here is the output with the sys.excepthook commented out:
$ py...
Rails 2.3-style plugins and deprecation warnings running task in Heroku
...Engine
alias :not_silenced_initialize :initialize
def initialize(root)
ActiveSupport::Deprecation.silence{ self.send :not_silenced_initialize, root }
end
end
end
and require it in config/application.rb just after requiring Rails:
require 'rails/all'
require File.expand_path...
Importing files from different folder
...
If you run it from your root folder (ie. application folder), you are probably fine with sys.path.append('.') then importing the module by using from app2.some_folder.some_file import your_function. Alternatively what works for me is running python...
Permission denied (publickey) when SSH Access to Amazon EC2 instance [closed]
...r admin on some Debians, according to Bogdan Kulbida's answer)(can also be root, fedora, see below)
Trying to connect the wrong host. Is that the right host you are trying to log in to?
Note that 1. will also happen if you have messed up the /home/<username>/.ssh/authorized_keys file on you...
Applications are expected to have a root view controller at the end of application launch
... see the layout from a storyboard make sure you got rid of the code in you root delegate function "application didFinishLaunchingWithOptions..." that's pointed at in main.m and only have "return YES;" in it.
– Olivier de Jonge
Jun 26 '14 at 11:01
...
Fragment over another fragment issue
...ayoutInflater inflater,ViewGroup container,Bundle savedInstance){
View root = somehowCreateView();
/*here is an implementation*/
root.setOnTouchListener(new View.OnTouchListener() {
public boolean onTouch(View v, MotionEvent event) {
return true;
}
});
...
What column type/length should I use for storing a Bcrypt hashed password in a Database?
...spectively.
As you use the 2a format, you’ll need 60 bytes. And thus for MySQL I’ll recommend to use the CHAR(60) BINARYor BINARY(60) (see The _bin and binary Collations for information about the difference).
CHAR is not binary safe and equality does not depend solely on the byte value but on th...
Get absolute path of initially run script
...script str_replace( basename(__FILE__) , '',str_replace($_SERVER["DOCUMENT_ROOT"],'',str_replace('\\','/',__FILE__ ) ) ) === /folder1/folder2/
– Salem
Jul 3 '16 at 3:36
2
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How do I list all the columns in a table?
...
For MySQL, use:
DESCRIBE name_of_table;
This also works for Oracle as long as you are using SQL*Plus, or Oracle's SQL Developer.
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