如何将Ruby连接到Postgresql？

Question

我尝试将 ruby 连接到 postgres，但无法连接，它显示错误

"uninitialized constant PGconn"

。

require "pg"
conn = PGconn.connect("localhost", 5432, "", "", "test1")
res = conn.exec("select * from a;")

Answer 1

PGConn 错了，postgres gem

pg

现在正在使用

PG

。

示例：

require 'pg' 
conn = PG.connect( dbname: 'sales' ) 
conn.exec( "SELECT * FROM pg_stat_activity" ) do |result| 
    result.each do |row| 
        puts row.values_at('procpid', 'usename', 'current_query')
    end
end

Answer 2

或者：

require 'pg'

pg_connection = PG::Connection.new(host: 'localhost', user: 'postgres', password: 'postgres')

Connection.new

文档。