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Add primary key to existing table
...y detail. Hope this answer can help other SQL beginner.
Reference:https://www.w3schools.com/sql/sql_primarykey.asp
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What does the red exclamation point icon in Eclipse mean?
...amation on my projects.
I got some more information from this guy:
http://www.mkyong.com/maven/how-to-configure-m2_repo-variable-in-eclipse-ide/
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Determine if ActiveRecord Object is New
...th=\"50\" height=\"18\" viewBox=\"0 0 50 18\" fill=\"none\" xmlns=\"http://www.w3.org/2000/svg\"\u003e\u003cpath d=\"M46.1709 9.17788C46.1709 8.26454 46.2665 7.94324 47.1084 7.58816C47.4091 7.46349 47.7169 7.36433 48.0099 7.26993C48.9099 6.97997 49.672 6.73443 49.672 5.93063C49.672 5.22043 48.9832 4...
Simple C example of doing an HTTP POST and consuming the response
...site.com 80 POST / "name=ARG1&value=ARG2" "Content-Type: application/x-www-form-urlencoded"
Here is the code:
#include <stdio.h> /* printf, sprintf */
#include <stdlib.h> /* exit, atoi, malloc, free */
#include <unistd.h> /* read, write, close */
#include <string.h> /*...
How to create PDFs in an Android app? [closed]
...is how to do it:
http://sourceforge.net/projects/itext/ (library)
http://www.vogella.de/articles/JavaPDF/article.html (tutorial)
http://tutorials.jenkov.com/java-itext/image.html (images tutorial)
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How to set a cookie for another domain
...ad user experience you can set an image on domain A.
<img src="http://www.example.com/cookie.php?val=123" style="display:none;">
And then on domain B that is example.com in cookie.php you'll have the following code:
<?php
setcookie('a', $_GET['val']);
?>
Hattip to Subin
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ruby convert array into function arguments
...th=\"50\" height=\"18\" viewBox=\"0 0 50 18\" fill=\"none\" xmlns=\"http://www.w3.org/2000/svg\"\u003e\u003cpath d=\"M46.1709 9.17788C46.1709 8.26454 46.2665 7.94324 47.1084 7.58816C47.4091 7.46349 47.7169 7.36433 48.0099 7.26993C48.9099 6.97997 49.672 6.73443 49.672 5.93063C49.672 5.22043 48.9832 4...
Warning - Build path specifies execution environment J2SE-1.4
...e, you should install the correct, old JDK. You can find them here: http://www.oracle.com/technetwork/java/archive-139210.html
If you then restart eclipse you can go into Window > Preferences > Java > Installed JREs > Execution Environments and set for in your case J2SE-1.4 the [perfect...
How to get everything after a certain character?
...th=\"50\" height=\"18\" viewBox=\"0 0 50 18\" fill=\"none\" xmlns=\"http://www.w3.org/2000/svg\"\u003e\u003cpath d=\"M46.1709 9.17788C46.1709 8.26454 46.2665 7.94324 47.1084 7.58816C47.4091 7.46349 47.7169 7.36433 48.0099 7.26993C48.9099 6.97997 49.672 6.73443 49.672 5.93063C49.672 5.22043 48.9832 4...
What are these ^M's that keep showing up in my files in emacs?
...issues-with-line-endings/
And more information you can find here:
https://www.jetbrains.com/help/idea/configuring-line-separators.html#d84378e48
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