ruby-on-rails - JRuby/基本 PostgreSQL 连接

Question

因此我可以将此 gem 用于事件记录:https://github.com/jruby/activerecord-jdbc-adapter

但是，我想在 JRuby 上使用以下代码连接到遗留数据库并运行一些手动查询，我该如何使用 JRuby/Rails 4.0.0？

require 'pg'
conn = PGconn.connect("192.168.0.2", 5432, '', '', "mydb", "postgres", "password")

Answer 1

The docs提出一些类似的建议:

# connection setup
ActiveRecord::Base.establish_connection(
  :adapter => 'jdbc',
  :driver => 'org.postgresql.Driver',
  :url => 'jdbc:postgresql:sample_db;create=true'
)

或者

ActiveRecord::Base.establish_connection(
  adapter: 'postgresql',
  database: 'db/my-database'
)

这是假设您正在使用 JDBC 和 appropriate configuration .为此，我建议看看 Postgres' documentation .

那里提供的示例是用 Java 编写的:

String url = "jdbc:postgresql://localhost/test";
Properties props = new Properties();
props.setProperty("user","fred");
props.setProperty("password","secret");
props.setProperty("ssl","true");
Connection conn = DriverManager.getConnection(url, props);

String url = "jdbc:postgresql://localhost/test?user=fred&password=secret&ssl=true";
Connection conn = DriverManager.getConnection(url);

...但我会按照这些思路滚动:

ActiveRecord::Base.establish_connection(
  :adapter => 'jdbc',
  :driver => 'org.postgresql.Driver',
  :url => 'jdbc:postgresql:sample_db;create=true'
  :user => 'myuser'
  :password => 's3cret!'
)

或者，有 JRuby-PG

问候，