JRuby 上 Rails 的 ActiveRecord 数据库 gem 是什么

Question

When running rails on JRUBY , database adapters have two different gems.

1. Sql Server : sqlserver gem Vs activerecord-sqlserver-adapter gem
2. Mysql : jdbcmysql gem vs activerecord-jdbcmysql-adapter gem
3. Sqlite3 : jdbcsqlite3 gem Vs activerecord-jdbcsqlite3-adapter gem
4. Postgresql : jdbcpostgresql gem Vs activerecord-jdbcpostgresql-adapter gem
5. jdbc : jdbc gem vs activerecord-jdbc-adapter gem

So question is, What is the difference between jdbcpostgresql and its long form activerecord-jdbcpostgresql-adapter gem?

Answer 1

jdbcpostgresql = Java Database Connectivity for postgresql database

activerecord-jdbcpostgresql-adapter = a postgresql database adapter for Rails ActiveRecord to allow it to be used with JRuby.

JDBC (Java Database Connectivity)

ActiveRecord-JDBC-Adapter (AR-JDBC) is a database adapter for Rails' ActiveRecord component that can be used with JRuby. It allows use of virtually any JDBC-compliant database with your JRuby on Rails application.

Answer 2

i don't know the difference but i use the following in rails 3+ apps with jruby and postgres for the Gemfile

gem 'activerecord-jdbcpostgresql-adapter'
gem 'jruby-openssl'

see also the README file - https://github.com/jruby/activerecord-jdbc-adapter