大约有 40,000 项符合查询结果（耗时：0.0473秒） [XML]
How to have an automatic timestamp in SQLite?
...
Just declare a default value for a field:
CREATE TABLE MyTable(
ID INTEGER PRIMARY KEY,
Name TEXT,
Other STUFF,
Timestamp DATETIME DEFAULT CURRENT_TIMESTAMP
);
However, if your INSERT command explicitly sets this field to N...
What’s the difference between “Array()” and “[]” while declaring a JavaScript array?
...ceeds the size of the stack, and it has to be re-created. So there can actually, depending on the use case, be a performance increase when using new Array() because you can prevent the overflow from happening.
As pointed out in this answer, new Array(5) will not actually add five undefined items to...
Which version of PostgreSQL am I running?
...e doesn't help, try find:
$ sudo find / -wholename '*/bin/postgres' 2>&- | xargs -i xargs -t '{}' -V # xargs is intentionally twice.
/usr/pgsql-9.6/bin/postgres -V
postgres (PostgreSQL) 9.6.1
Although postmaster can also be used instead of postgres, using postgres is preferable because p...
Is there any sed like utility for cmd.exe? [closed]
...ch slimmer.
GnuWin32 is another port that works.
Another alternative is AT&T Research's UWIN system.
MSYS from MinGw is yet another option.
Windows Subsystem for Linux is a most "native" option, but it's not installed on Windows by default; it has sed, grep etc. out of the box, though.
https://g...
Building a notification system [closed]
...r users on the site, I would tie them with nodejs + websockets client with php pushing update to nodejs for all listeners as change gets added.
share
answe...
What are the most-used vim commands/keypresses?
...rouble wading through the gargantuan lists of things you can do in VIM and all of the keypresses for them. I'm tired of hearing "You can use 'I' for inserting text, or 'a' for appending text after the character, or 'A' for appending text at the end of the line, or…" I can't imagine everyone uses a...
Was PreferenceFragment intentionally excluded from the compatibility package?
... contains deprecated methods (although these are used in the accompanying sample code), I looked at PreferenceFragement and the compatibility package to solve my woes.
...
How to redirect all HTTP requests to HTTPS
... http://www.example.com ) to HTTPS ( https://www.example.com ). I'm using PHP btw. Can I do this in .htaccess?
26 Answers
...
How do I check CPU and Memory Usage in Java?
...
If you are looking specifically for memory in JVM:
Runtime runtime = Runtime.getRuntime();
NumberFormat format = NumberFormat.getInstance();
StringBuilder sb = new StringBuilder();
long maxMemory = runtime.maxMemory();
long allocatedMemory = runtime...
SyntaxError: Non-ASCII character '\xa3' in file when function returns '£'
...
@plaes what about if it's on a variable? example by reading a file? I can't use uVariable, how I do it?
– Skizo-ozᴉʞS
Mar 3 '17 at 15:36
1
...