If you want to find the location of your log file in Postgres, you'll need to hop into a Psql session.. psql dbname Then it's as simple as running.. show data_directory ; Which will output the data directory, in my case.. /Users/sea...

If you're working with SQLAlchemy, the best database driver for Python, and want to see only SQL syntax errors, you need to use the StatementError exception class. On it, is an attribute `orig`, that contains just the SQL syntax error... and not any data...

Here is some code just in case you want to look at and query the queries hitting your MySQL database. Enter this from the mysql client console. mysql> SET GLOBAL log_output = 'TABLE' mysql> SET GLOBAL general_log = 'ON'; mysql> select event_ti...

To import a CSV file into SQLite is easy. sqlite3 my.db .mode csv .import path/to/file.csv name_of_table And done.

You can write reusable scripts with Postgres by taking advantage of named variables. A named variable starts with a `:` in your sql script. Here is an example select :a_number You can then use this statement with `psql` and the `--variable` fl...

Here is a code snippet that demonstrates how to set up a __ManyToMany through__ relationship in Django. In Rails, the equivalent would be called a __has_many through__ association. If you set the __through__ argument on the ManyToManyField, Django wil...

When running raw SQL queries in Django you must include a primary key otherwise an invalid query exception is raised. Normally this is fine but when running more complex queries a primary key may not be available or even make sense. There is a simple ...

Here is a little snippet that will return new signups (or new records) for today select id, email, created_at::date date from signups where email not in (select distinct email from signups where created_at < current_date)

I spent a few hours digging around my file system using `find` and `grep` hunting for my SQLite database that the iPhone Simulator was using for my React Native project. And no luck. But I found a simple solution was to use `react-native log-ios` and ...

Here are a few snippets for cross database queries. It's important to note that you must be explicit in enumerating the columns and types you are querying. Otherwise, things will probably not work as expected. -- enable extension create extension db...

If you run into this error when trying to create a user in mysql, chances are you already have this user account created. create user 'someuser'@'localhost' identified by 'somepassword'; ERROR 1396 (HY000): Operation CREATE USER failed for 'someuser...

This query and pattern will return urls in text all within a single SQL query. select substring(column_name from '.*://([^/]*)') as domain_name from table_name; And here it is in a larger query, say for retrieving page view counts for referrers. ...

If you have an string of numbers like "1,2,3" and you want to turn it into an array of integers you need to cast it into an integer array type. "{1,2,3}"::int[] This is commonly used together when grabbing a set using the ANY clause. sele...

Make a directory ( it can anywhere ) called baks/mysql mkdir -p /baks/mysql Create a file (it can be anywhere) called /root/mysql_backups.sh and put this script in it #!/bin/bash # modify the following to suit your environment export DB...

Short and sweet. Here all the commands I run in this order to set up a brand new box. It usually takes about 10 - 15 minutes on a 256 MB RAM instance. Compiling Ruby Enterprise Edition, which is super easy, will take the most amount of time. It will seem ...

Remember to include the host declaration in the database.yml file when you deploy to Dreamhost. Dreamhost does not use "localhost" which is typically the default setting when using the mysql adapter and developing locally or even on a small site. At lea...

I wrote a review for Joseph Thibault's Moodle News on extension development for Moodle. The book is quite good and I think an essential resource for anyone wanting to develop in Moodle. The book focuses on plugin development, but it will also give you an ...

Workshop Dog is a free events calendar for dog training workshops and group lessons. Users can list their training workshops as well as create a business profile. Jobs may be posted to the site for a small fee. Events that are created are distributed to...

Active Record find methods for selecting range from http://charlesmaxwood.com/notes-from-reading-activerecordbase/ Student.find(:all, :conditions => { :grade => 9..12 }) return a range Student.find(:all, :conditions => { :grade => [9,11,12] }) will retu...

Output .sql file for MySQL but without the drop table syntax before table name use the --skip-add-drop-table flag mysqldump -u root -p database_name --skip-add-drop-table --skip-lock-tables > database_name.sql

If you want to insert a datetime that matches the default mysql datetime type format use this date('Y-m-d H:i:s');

MySQL doesn't support having two columns with time stamping on both initialization and/or on updating at the same time. It would be nice to be able to do *this* where the created_at column gets the current_timestamp on initialization and the updated_at ge...

I ran into the same problem when installing mysql gem for Rails development. This fix worked for me http://seanbehan.com/programming/fixing-mysql-for-rails-2-2-development-on-mac-os-x/ The same thing works with the data objects gem. Just specify the path...

Oh what trouble Rails 2.2 and MySQL (on Mac OS X) can be. Rails, as of version >= 2.2, no longer comes bundled with the MySQL adapter. This means you'll need to install it yourself, but it appears that the gem for installing it is also broken. This will ...

Here is a quick way to put the contents of a database table into a simple text file. This could be handy if for example, you just want to grab some emails and pop the results into a simple csv file. Your sql statement can be as creative as sql allows. All...

Sample Ruby on Rails database config file for connecting to mysql. production: adapter: mysql encoding: utf8 reconnect: false database: db_production pool: 5 username: db_user password: db_password #socket: /tmp/mysql.sock #this may vary ...

mysql driver is no longer bundled w/ rails. you'll need to install it yourself w/ sudo gem install mysql however, on ubuntu (heron) this won't work. issue these commands first sudo apt-get install libmysql-ruby libmysqlclient-dev if libmysqlclient-dev...

Here are a list of commands to get up and running with Apache2 with Phussion Passenger for Rails, PHP5, MySQL5, Ruby on Rails with Gems, and the source control software Git. I think that this is a pretty ideal environment for a development box and even pr...