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What are the options for storing hierarchical data in a relational database? [closed]
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Columns: one for each lineage level, refers to all the parents up to the root, levels below the current items' level are set to 0 (or NULL)
There is a fixed limit to how deep the hierarchy can be
Cheap ancestors, descendants, level
Cheap insert, delete, move of the leaves
Expensive insert, delete,...
How to add a button to PreferenceScreen
...lass FilterActivity extends PreferenceActivity {
private LinearLayout rootView;
private LinearLayout buttonView;
private Button buttonDone;
private Button buttonRevert;
private ListView preferenceView;
private LinearLayout gradientView;
private ScrollView scrollRoot;
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Can Git hook scripts be managed along with the repository?
...p semi-automatically).
To do the symlink on *nix, all you need to do is:
root="$(pwd)"
ln -s "$root/hooks" "$root/.git/hooks"
use ln -sf if you're ready to overwrite what's in .git/hooks
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How do I 'svn add' all unversioned files to SVN?
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Actually that should be .\* or if svn root is on a different dir stuff\svn_root\*.
– Nux
Feb 12 '14 at 14:01
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Docker and securing passwords
...mands. (Of course, any user that has access to docker on the host also has root anyway.)
My preferred pattern is to use a wrapper script as the ENTRYPOINT or CMD. The wrapper script can first import secrets from an outside location in to the container at run time, then execute the application, prov...
How can I change Mac OS's default Java VM returned from /usr/libexec/java_home
...ust have Administrator privileges and execute the remove command either as root or by using the sudo(8) tool.
Navigate to /Library/Java/JavaVirtualMachines and remove the directory whose name matches the following format:*
/Library/Java/JavaVirtualMachines/jdk<major>.<minor>.&l...
Why so red? IntelliJ seems to think every declaration/method cannot be found/resolved
...want to try a maven->force reimport from within intellij on the project root
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mongoose vs mongodb (nodejs modules/extensions), which better? and why?
...oose's.
I'm coming from PHP world, there we had raw sql with depreciated mysql_ functions, then we got PDO - object orientated abstraction layer to communicate with sql. Or you can choose some heavy ORM like Doctrine to have similar stuff to mongoose on mongoDB. Objects with setter/getters/save me...
Node.js EACCES error when listening on most ports
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Running on your workstation
As a general rule, processes running without root privileges cannot bind to ports below 1024.
So try a higher port, or run with elevated privileges via sudo. You can downgrade privileges after you have bound to the low port using process.setgid and process.setuid.
Ru...
Where is Java Installed on Mac OS X?
... about inaccessible directories, get rid of the messages rather than using root privs unnecessarily. Using sudo all the time is a bad habit. Redirect stderr to /dev/null, like this: find / -name java 2> /dev/null
– Walter Underwood
Sep 26 '13 at 15:29
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