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Preserve HTML font-size when iPhone orientation changes from portrait to landscape
...y:
html {
-webkit-text-size-adjust: 100%; /* Prevent font scaling in landscape while allowing user zoom */
}
The use of this property is described further in the Safari Web Content Guide.
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Trying to add adb to PATH variable OSX
I am trying to develop for android and I want to add the adb to my PATH so that I can launch it really easily. I have added directories before by for some reason adb does not want to be found. This is very frustrating. Has anyone else had this problem before?
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Remove all classes that begin with a certain string
... is on the div. I want to be able to clear all classes with a given prefix and then add a new one. If I want to remove all of the classes that begin with "bg", how do I do that? Something like this, but that actually works:
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Add a default value to a column through a migration
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I tried it on PostgreSQL and it updated previously created fields.
– Aboozar Rajabi
May 12 '16 at 6:31
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how to read System environment variable in Spring applicationContext
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-Dprop=... sets a java property in command line. You can read this property via System.getProperty("prop"). If you would like to read a OS property then use System.getenv("os-env-variable"). See javadoc: docs.oracle.com/javase/6/docs/api/java/lang/System.html
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Proxies with Python 'Requests' module
... specify different (or the same) proxie(s) for requests using http, https, and ftp protocols:
http_proxy = "http://10.10.1.10:3128"
https_proxy = "https://10.10.1.11:1080"
ftp_proxy = "ftp://10.10.1.10:3128"
proxyDict = {
"http" : http_proxy,
"https" : https_proxy...
'git status' shows changed files, but 'git diff' doesn't
I've had a look at all similar questions. However, I've double checked and something strange is definitely happening.
13 An...
What is the 'override' keyword in C++ used for? [duplicate]
...is real use of override , perhaps with an example would be easy to understand.
4 Answers
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MySQL SELECT only not null values
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You should use IS NOT NULL. (The comparison operators = and <> both give UNKNOWN with NULL on either side of the expression.)
SELECT *
FROM table
WHERE YourColumn IS NOT NULL;
Just for completeness I'll mention that in MySQL you can also negate the null safe equality op...
Is there a version control system for database structure changes?
...file, which has rules to increase the db version (such as adding a column) and rules to downgrade the version (such as removing a column). Each migration is numbered, and a table keeps track of your current db version.
To migrate up, you run a command called "db:migrate" which looks at your version...