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How to change default timezone for Active Record in Rails?
... as well. I have an inherited legacy PHP app that interacts with the same mysql database and stores all times as local; updating it to use UTC was not an option. What I had previously accomplished nothing: config.time_zone = 'Central Time (US & Canada)' config.active_record.default_timezone ...
Replacing Pandas or Numpy Nan with a None to use with MysqlDB
I am trying to write a Pandas dataframe (or can use a numpy array) to a mysql database using MysqlDB . MysqlDB doesn't seem understand 'nan' and my database throws out an error saying nan is not in the field list. I need to find a way to convert the 'nan' into a NoneType.
...
Disable ActiveRecord for Rails 4
...existing applications:
1. Remove database adapter gems from your Gemfile (mysql2, sqlite3, etc.)
2. Change your config/application.rb
Remove require 'rails/all line and require frameworks (among those available in your rails version, the list varies, do not just copy) you want to use, for example...
How to get ERD diagram for an existing database?
...L and Oracle, as I know they also support some other DBMS like PostgreSQL, MySQL, Sybase, DB2 and SQLite.
Steps:
Select Tools > DB > Reverse Database... from the toolbar of Visual
Paradigm
Keep the settings as is and click Next Select PostgreSQL as
driver and provide the driver file there....
Check if SQL Connection is Open or Closed
...
Here is what I'm using:
if (mySQLConnection.State != ConnectionState.Open)
{
mySQLConnection.Close();
mySQLConnection.Open();
}
The reason I'm not simply using:
if (mySQLConnection.State == ConnectionState.Closed)
{
mySQLConnection.Open()...
Ruby off the rails
... with the floor sensors and the lighting controllers. The system queries a MYSQL database for the media files to be displayed and then tells computers in the walls to play the media via UDP.
It's the most reliable part of the entire exhibit.
Ruby was used for the other major part of the exhibit, t...
How to get last N records with activerecord?
...e with first. In SQL the order isn't guaranteed unless you specify it, but MySQL is more forgiving.
– Ghoti
Jul 15 '12 at 10:56
5
...
Find document with array that contains a specific value
...
As someone new to Mongo coming from an RDBMS like MySQL, to find that such solutions work so simply without needing JOINs and additional tables makes me wonder why I haven't started on Mongo sooner. But that's not to say either DBMS is superior over the other - it depends on...
普通码农和CTO之间的差距，就是这7点了 - 杂谈 - 清泛网 - 专注C/C++及内核技术
...要以为名气大就不会被干掉，被干掉OpenSolaris、OpenOffice、Mysql个个历史悠久，名气大。）
那么究竟什么是“技术”？答案：数据结构、操作系统、计算机体系结构、数据库原理、编译器工作原理、软件工程方法论等。我们的所...
How to format a java.sql Timestamp for displaying?
...
If you're using MySQL and want the database itself to perform the conversion, use this:
DATE_FORMAT(date,format)
If you prefer to format using Java, use this:
java.text.SimpleDateFormat
SimpleDateFormat dateFormat = new SimpleDateFormat(...