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Conveniently map between enum and int / String
...I always store constants as strings in my databases. (Actually, when using MySql, I store them as MySql enums!)
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Map enum in JPA with fixed values?
...nverter.
Create an enumerated class like so:
public enum NodeType {
ROOT("root-node"),
BRANCH("branch-node"),
LEAF("leaf-node");
private final String code;
private NodeType(String code) {
this.code = code;
}
public String getCode() {
return code;
...
How to use index in select statement?
...swer your specific question you have to specify the DB you are using.
For MySQL, you want to read the Index Hint Syntax documentation on how to do this
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Simulate delayed and dropped packets on Linux
...y to all packets going out of the local Ethernet.
# tc qdisc add dev eth0 root netem delay 100ms
Now a simple ping test to host on the local network should show an increase of 100 milliseconds. The delay is limited by the clock resolution of the kernel (Hz). On most 2.4 systems, the system cl...
What is the difference between JOIN and UNION?
... subsets it -- completely different operations. Trivial example of UNION:
mysql> SELECT 23 AS bah
-> UNION
-> SELECT 45 AS bah;
+-----+
| bah |
+-----+
| 23 |
| 45 |
+-----+
2 rows in set (0.00 sec)
similary trivial example of JOIN:
mysql> SELECT * FROM
-> (SELECT...
Emulator error: This AVD's configuration is missing a kernel file
...r the SDK files and will look something like:
emulator: found ANDROID_SDK_ROOT: C:\Program Files (x86)\Android\android-sdk
Make sure that location is correct.
In my case, ANDROID_SDK_ROOT was initially set incorrectly to my home directory. This is because I set it that way by blindly following t...
Permission denied on accessing host directory in Docker
...preferred solution is to start the container with an entrypoint running as root, fix the uid/gid of the user inside the container to match the host volume uid/gid, and then use gosu to drop from root to the container user to run the application inside the container. The important script for this is ...
Get Output From the logging Module in IPython Notebook
...y creating a
StreamHandler with a default Formatter and adding it to the root
logger. The functions debug(), info(), warning(), error() and
critical() will call basicConfig() automatically if no handlers are
defined for the root logger.
This function does nothing if the root logger alre...
Execute a terminal command from a Cocoa app
...n use this method like this:
NSString *output = runCommand(@"ps -A | grep mysql");
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How does RewriteBase work in .htaccess
...writeBase, Apache usually detects it correctly for paths under the DocumentRoot unless:
You are using Alias directives
You are using .htaccess rewrite rules to perform HTTP redirects (rather than just silent rewriting) to relative URLs
In these cases, you may find that you need to specify the Re...