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How to convert hashmap to JSON object in Java
How to convert or cast hashmap to JSON object in Java, and again convert JSON object to JSON string?
29 Answers
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Get the correct week number of a given date
...lly verified this to be correct for years 2012 to 2018 (assuming that epochconverter.com is correct). We should all rejoice this year that week 1 of 2018 actually started on the first of January for once!
– Aidan
Oct 21 '18 at 10:39
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How do I list all the columns in a table?
For the various popular database systems, how do you list all the columns in a table?
12 Answers
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Iterator Loop vs index loop [duplicate]
.... If your container's size is larger than INT_MAX then obviously you can't convert it to int and the code fails. long long would be safer (especially as it's finally standard). I will never create a vector with 2^63 elements but I might with 2^31.
– Steve Jessop
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How to include (source) R script in other scripts
...e, checks to see if the file has been loaded into the environment and uses sys.source to source the file if not.
Here's a quick and untested function (improvements welcome!):
include <- function(file, env) {
# ensure file and env are provided
if(missing(file) || missing(env))
stop("'fil...
How to check if any flags of a flag combination are set?
...T : struct
{
CheckIsEnum<T>(true);
long lValue = Convert.ToInt64(value);
long lFlag = Convert.ToInt64(flag);
return (lValue & lFlag) != 0;
}
public static IEnumerable<T> GetFlags<T>(this T value) where T : struct
{
CheckI...
Cannot find module cv2 when using OpenCV
I have installed OpenCV on the Occidentalis operating system (a variant of Raspbian) on a Raspberry Pi, using jayrambhia's script found here . It installed version 2.4.5.
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Generate a random number in the range 1 - 10
...: select (trunc(random() * 10) % 10) + 1
The output from trunc has to be converted to INTEGER. But it can be done without trunc. So it turns out to be simple.
select (random() * 9)::INTEGER + 1
Generates an INTEGER output in range [1, 10] i.e. both 1 & 10 inclusive.
For any number (floats)...
How can I return NULL from a generic method in C#?
... the problem with this is that if you're using this generic method to say, convert a Database object from DbNull to Int and it returns default(T) where T is an int, it'll return 0. If this number is actually meaningful, then you'd be passing around bad data in cases where that field was null. Or a b...
SQL Server principal “dbo” does not exist,
...r before this issue. Execute this command in your database to set owner to sysadmin account:
use [YourDatabaseName] EXEC sp_changedbowner 'sa'
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