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ConcurrentHashMap vs Synchronized HashMap
...e is no locking at the object level,The locking is at a much finer granularity. For a ConcurrentHashMap, the locks may be at a hashmap bucket level.
The effect of lower level locking is that you can have concurrent readers and writers which is not possible for synchronized collections. This leads t...
How to increase the vertical split window size in Vim
:vsplit (short form: :vs ) split the Vim viewport vertically. :30vs splits the viewport, making the new window 30 characters wide. Once this 30 char window is created, how would one change it's size to 31 or 29?
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JPA CascadeType.ALL does not delete orphans
I am having trouble deleting orphan nodes using JPA with the following mapping
11 Answers
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How to run Nginx within a Docker container without halting?
I have Nginx installed on a Docker container, and am trying to run it like this:
9 Answers
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Convert Rows to columns using 'Pivot' in SQL Server
... can use the PIVOT function to transform the data from rows into columns.
It sounds like you will need to use dynamic sql if the weeks are unknown but it is easier to see the correct code using a hard-coded version initially.
First up, here are some quick table definitions and data for use:
CREAT...
Test if a command outputs an empty string
...es – they output them. You can capture this output by using command substitution; e.g. $(ls -A). You can test for a non-empty string in Bash like this:
if [[ $(ls -A) ]]; then
echo "there are files"
else
echo "no files found"
fi
Note that I've used -A rather than -a, since it omits the ...
MySQL “between” clause not inclusive?
If I run a query with a between clause, it seems to exclude the ending value.
For example:
10 Answers
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How do I clear my local working directory in Git? [duplicate]
How can I clear my working directory in Git?
6 Answers
6
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How can I get the application's path in a .NET console application?
...System.Reflection.Assembly.GetExecutingAssembly().Location1
Combine that with System.IO.Path.GetDirectoryName if all you want is the directory.
1As per Mr.Mindor's comment:
System.Reflection.Assembly.GetExecutingAssembly().Location returns where the executing assembly is currently located, wh...
Forgot “git rebase --continue” and did “git commit”. How to fix?
I was rebasing code in git, I got some merge conflicts. I resolved the conflicts and did:
4 Answers
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