无法使用gem“pg”从我的Ruby脚本连接到Postgres(pg)数据库(这不是rails,只是纯粹的ruby)

时间:2013-09-08 15:55:24

标签: ruby postgresql rubygems database-connection pg

我为我的Mac OSX机器下载了postgres.app。我有一个rails应用程序已连接并使用postgres应用程序附带的postgres数据库。

现在我正在编写一个纯Ruby测试脚本(Not Rails,纯Ruby,甚至不是Active Record)来尝试连接到postgres数据库实例。这些是我设置它的步骤

 1) ran this command on the terminal:
    gem install pg -- --with-pg-config=/Applications/Postgres.app/Contents/MacOS/bin/pg_config

 2) Added this code to the test script:

   #!/usr/bin/env ruby
   #encoding: utf-8
   require "pg"


    @conn = PG.connect(
    :dbname => 'oData',
    :user => 'am',
    :password => '')

    @conn.exec("CREATE TABLE programs (id serial NOT NULL, name character varying(255);");

我从这个link

得到了这个

当我运行此脚本时,出现以下错误:

   /Users/am/.rvm/gems/ruby-2.0.0-p247/gems/pg-0.16.0/lib/pg.rb:38:in `initialize': could 
    not connect to server: No such file or directory (PG::ConnectionBad)
Is the server running locally and accepting
connections on Unix domain socket "/var/pgsql_socket/.s.PGSQL.5432"?

我的调试工作:

  My postgres.app is up and running. 

  I looked at the pg gem [documentation][2] and my syntax seemed OK.

  The location of my postgres DB is entered in my bash script like so
   PATH="/Applications/Postgres.app/Contents/MacOS/bin:$PATH"

不确定下一步该怎么做。任何帮助将不胜感激,谢谢。

3 个答案:

答案 0 :(得分:0)

你确定postgres正在监听套接字吗?你确定用户名和密码是对的吗?

我倾向于尝试像

这样的东西
require 'pg'

puts PG::Connection.ping(:dbname => 'oData',:user => 'am',:password => '')
puts "trying with tcp"
puts PG::Connection.ping(:dbname => 'oData',:user => 'am',:password => '', :port => 5432)

答案 1 :(得分:0)

我使用活动记录gem来使连接正常工作,这很好

答案 2 :(得分:0)

连接设置适合我。

但该代码应该看起来像

  

@ conn.exec(“CREATE TABLE程序(id serial NOT NULL,name   字符(255))“)