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Jackson serialization: ignore empty values (or null)
I'm currently using jackson 2.1.4 and I'm having some trouble ignoring fields when I'm converting an object to a JSON string.
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How to determine if a process runs inside lxc/Docker?
... way to determine if a process (script) runs inside an lxc container (~ Docker runtime)? I know that some programs are able to detect whether they run inside a virtual machine, is something similar available for lxc/docker?
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Factors in R: more than an annoyance?
... pain and I never use them. I always convert to characters. I feel oddly like I'm missing something.
7 Answers
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SQL: deleting tables with prefix
...)
AS statement FROM information_schema.tables
WHERE table_name LIKE 'myprefix_%';
This will generate a DROP statement which you can than copy and execute to drop the tables.
EDIT: A disclaimer here - the statement generated above will drop all tables in all databases with that prefix. I...
Java Date cut off time information
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jitter
51.4k1111 gold badges104104 silver badges118118 bronze badges
answered Dec 15 '09 at 15:58
cletuscletus
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Install an apk file from command prompt?
.... First I want to build after compiling all the .jar files to create an .apk file for an Android application without using Eclipse.
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How to extract the first two characters of a string in shell scripting?
... in-shell method is usually better if you're going to be doing it a lot (like 50,000 times per report as you mention) since there's no process creation overhead. All solutions which use external programs will suffer from that overhead.
If you also wanted to ensure a minimum length, you could pad it...
How can I connect to MySQL in Python 3 on Windows?
...g pymysql.install_as_MySQLdb()
https://pypi.python.org/pypi/cymysql
fork of pymysql with optional C speedups
https://pypi.python.org/pypi/mysqlclient
Django's recommended library.
Friendly fork of the original MySQLdb, hopes to merge back some day
The fastest implementation, as it is C based...
glob exclude pattern
... answered Mar 29 '16 at 21:32
KenlyKenly
13.8k55 gold badges3232 silver badges4949 bronze badges
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How to access command line arguments of the caller inside a function?
...e bash ref manual says this stuff is captured in BASH_ARGV,
although it talks about "the stack" a lot.
#!/bin/bash
function argv {
for a in ${BASH_ARGV[*]} ; do
echo -n "$a "
done
echo
}
function f {
echo f $1 $2 $3
echo -n f ; argv
}
function g {
echo g $1 $2 $3
...