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add column to mysql table if it does not exist
... number.
Another solution would be to just try the ALTER TABLE ADD COLUMN command. It should throw an error if the column already exists.
ERROR 1060 (42S21): Duplicate column name 'newcolumnname'
Catch the error and disregard it in your upgrade script.
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Best way to store password in database [closed]
...ssword, you hash the value (using the same hashing algorithm and salt) and compare it to the hashed value in the database.
So, while it is a good thing you are thinking about this and it is a good question, this is actually a duplicate of these questions (at least):
How to best store user informa...
Installing multiple instances of the same windows service on a server
...a to our client application and everything is going great. The client has come up with a fun configuration request that requires two instances of this service running on the same server and configured to point at separate databases.
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Allow user to select camera or gallery for image
...{
final Intent finalIntent = new Intent(camIntent);
finalIntent.setComponent(new ComponentName(res.activityInfo.packageName, res.activityInfo.name));
yourIntentsList.add(finalIntent);
}
List<ResolveInfo> listGall = packageManager.queryIntentActivities(gallIntent, 0);
for (ResolveI...
Deep Learning（深度学习）学习笔记整理系列之（三） - 大数据 & AI - 清泛...
..._Series_3Deep Learning（深度学习）学习笔记整理系列zouxy09@qq.comhttp: blog.csdn.net zouxy09作者：Zouxyversion 1.0 2013-04-08原文网址：h...Deep Learning（深度学习）学习笔记整理系列
zouxy09@qq.com
http://blog.csdn.net/zouxy09
作者：Zouxy
version 1.0 2013-04-...
Set element focus in angular way
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Should Gemfile.lock be included in .gitignore?
...te all the gem dependencies each time you deploy, etc.
From cowboycoded's comment below:
If you are working on a gem, then DO NOT check in your Gemfile.lock. If you are working on a Rails app, then DO check in your Gemfile.lock.
Here's a nice article explaining what the lock file is.
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Is there any reason for using WebGL instead of 2D Canvas for 2D games/apps?
...these skills are harder to find, production is slower (due to the size and complexity of such a code base), and therefore it costs more.
WebGL is faster and it has more capabilities. No doubt about that. It's a native 3D API that gives you full access to the rendering pipeline, code and effects are...
How to count certain elements in array?
...s most elegant. E.g. for me, making a function call per element to just to compare it to a value is not elegant.
– Felix Kling
May 25 '11 at 8:33
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Git status ignore line endings / identical files / windows & linux environment / dropbox / mled
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