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I need to generate uuid for my rails application. What are the options(gems) I have? [duplicate]
...dom.uuid #=> "1ca71cd6-08c4-4855-9381-2f41aeffe59c"
See other possible formats here.
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How to take backup of a single table in a MySQL database?
...sername> -h <db_host> -p db_name table_name > table_name.sql
For further reference:
http://www.abbeyworkshop.com/howto/lamp/MySQL_Export_Backup/index.html
Restore
mysql -u <user_name> -p db_name
mysql> source <full_path>/table_name.sql
or in one line
mysql -u user...
Add a reference column migration in Rails 4
...n users table), PLUS it will also add an index on the new column.
UPDATE [For Rails 4.2]
Rails can’t be trusted to maintain referential integrity; relational databases come to our rescue here. What that means is that we can add foreign key constraints at the database level itself and ensure that...
Display open transactions in MySQL
... FULL PROCESSLIST
See: http://dev.mysql.com/doc/refman/5.1/en/thread-information.html
It will not help you, because you cannot commit a transaction from a broken connection.
What happens when a connection breaks
From the MySQL docs: http://dev.mysql.com/doc/refman/5.0/en/mysql-tips.html
...
querySelector, wildcard element match?
...ment name match using querySelector or querySelectorAll ? I see support for wildcards in attribute queries but not for the elements themselves.
...
How to link to apps on the app store
...a store that allows the
user to purchase other media from the App Store. For example, your app
might display the store to allow the user to purchase another app.
From News and Announcement For Apple Developers.
Drive Customers Directly to Your App
on the App Store with iTunes Links
...
Custom Drawable for ProgressBar/ProgressDialog
...
I used the following for creating a custom progress bar.
File res/drawable/progress_bar_states.xml declares the colors of the different states:
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item android:...
MongoDB Aggregation: How to get total records count?
I have used aggregation for fetching records from mongodb.
13 Answers
13
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MySQL order by before group by
...ents about using a subquery to accurate return this data.
MySQL does not force you to GROUP BY every column that you include in the SELECT list. As a result, if you only GROUP BY one column but return 10 columns in total, there is no guarantee that the other column values which belong to the post...
Can we pass parameters to a view in SQL?
...c or a function, then I guess databases may not be able to give you that information.
– nagu
Nov 14 '16 at 6:27
If you...