我使用 SQL Server 作为 Rails 项目的数据库。我正在尝试创建一些模型以用于第 3 方数据库,并且只想从此数据库中读取。所以我创建了一个我想为其创建对象的表的视图,然后我想将我的活动记录模型指向它。但是,在 Rails 控制台中,我没有得到预期的结果。返回一些正确信息的唯一示例是当我count
对对象执行 a 时,如下面的示例 3 所示。
我正在使用以下 gem 连接到我的 SQL Server:
gem 'tiny_tds'
gem 'activerecord-sqlserver-adapter'
我也安装了 freetds-dev 0.91-6build1
示例 1
2.2.2 :004 > Game.all
Game Load (268.7ms) EXEC sp_executesql N'SELECT [games].* FROM [games]'
=> #<ActiveRecord::Relation [#<Game >, #<Game >, #<Game >, #<Game >, #<Game >, #<Game >, #<Game >, #<Game >, #<Game >, #<Game >, ...]>
示例 2
2.2.2 :001 > Game.first
SQL (1.1ms) USE [Incoming]
Game Load (1.8ms) EXEC sp_executesql N'SELECT [games].* FROM [games] OFFSET 0 ROWS FETCH NEXT 1 ROWS ONLY'
TinyTds::Error: Incorrect syntax near '0'.: EXEC sp_executesql N'SELECT [games].* FROM [games] OFFSET 0 ROWS FETCH NEXT 1 ROWS ONLY'
ActiveRecord::StatementInvalid: TinyTds::Error: Incorrect syntax near '0'.: EXEC sp_executesql N'SELECT [games].* FROM [games] OFFSET 0 ROWS FETCH NEXT 1 ROWS ONLY'
from /home/daveomcd/.rvm/gems/ruby-2.2.2/gems/activerecord-sqlserver-adapter-4.2.3/lib/active_record/connection_adapters/sqlserver/database_statements.rb:336:in `each'
...
...
示例 3
2.2.2 :008 > Game.count
(4.7ms) EXEC sp_executesql N'SELECT COUNT(*) FROM [games]'
=> 12541
传入模型.rb
class IncomingModel < ActiveRecord::Base
self.abstract_class = true
self.table_name_prefix = "Incoming.dbo."
establish_connection "incoming_#{Rails.env}".to_sym
end
游戏模型.rb
class Game < IncomingModel
self.table_name = 'games'
end
数据库.yml
incoming_development:
<<: *default
adapter: sqlserver
host: games-data
port: 1433
database: Incoming
username: ****
password: ****
pool: 5
timeout: 15000