大约有 23,000 项符合查询结果（耗时：0.0435秒） [XML]
How to pass in password to pg_dump?
I'm trying to create a cronjob to back up my database every night before something catastrophic happens. It looks like this command should meet my needs:
...
Convert float to double without losing precision
I have a primitive float and I need as a primitive double. Simply casting the float to double gives me weird extra precision. For example:
...
Creating a range of dates in Python
I want to create a list of dates, starting with today, and going back an arbitrary number of days, say, in my example 100 days. Is there a better way to do it than this?
...
How can I detect when an Android application is running in the emulator?
I would like to have my code run slightly differently when running on the emulator than when running on a device. ( For example , using 10.0.2.2 instead of a public URL to run against a development server automatically.) What is the best way to detect when an Android application is running in the em...
std::function vs template
Thanks to C++11 we received the std::function family of functor wrappers. Unfortunately, I keep hearing only bad things about these new additions. The most popular is that they are horribly slow. I tested it and they truly suck in comparison with templates.
...
Can I have onScrollListener for a ScrollView?
I am using a HorizontalScrollView in a layout and I need to identify the user have reached the start and end point of the scroll.
...
What is the equivalent of “none” in django templates?
I want to see if a field/variable is none within a Django template. What is the correct syntax for that?
7 Answers
...
Converting JSON String to Dictionary Not List
I am trying to pass in a JSON file and convert the data into a dictionary.
6 Answers
6...
Why is a round-trip conversion via a string not safe for a double?
Recently I have had to serialize a double into text, and then get it back. The value seems to not be equivalent:
3 Answers
...
Getting ssh to execute a command in the background on target machine
This is a follow-on question to the How do you use ssh in a shell script? question. If I want to execute a command on the remote machine that runs in the background on that machine, how do I get the ssh command to return? When I try to just include the ampersand (&) at the end of the command it ...