0

我有两个表，一个与我的 rails 应用程序无关，另一个invtypes与items我的应用程序关联。

表invtypes有 20.000 条记录，我需要移动到items表中。

现在我的第一次尝试是简单地对 invtypes 进行 ActiveRecord 查询以获取所有条目，然后遍历每个条目并Item通过实例化新的Item model添加属性然后调用来创建一个新条目model.save

然而，这也做了验证和其他一些减慢的事情，使这个任务执行了 30 分钟，Rails Console因为我会这样做几次，我不能让它这么慢。

所以我的第二个想法是用普通的旧查询 no Models 尝试这个，但是现在这给出了一个错误：

  ←[1m←[35m (27.0ms)←[0m  INSERT INTO items (typeID, name, description, volume, price, created_at, updated_at) VALUES (0, '#System', '', 0.0, 0.0, '20
13-03-29 04:06:27 +0100', '2013-03-29 04:06:27 +0100');
ActiveRecord::StatementInvalid: Mysql2::Error: Incorrect datetime value: '2013-03-29 04:06:27 +0100' for column 'created_at' at row 1: INSERT INTO ite
ms (typeID, name, description, volume, price, created_at, updated_at) VALUES (0, '#System', '', 0.0, 0.0, '2013-03-29 04:06:27 +0100', '2013-03-29 04:
06:27 +0100');
        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-3.2.1/lib/active_record/connection_adapters/abstract_mysql_adapter.rb:2
33:in `query'
        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-3.2.1/lib/active_record/connection_adapters/abstract_mysql_adapter.rb:2
33:in `block in execute'
        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-3.2.1/lib/active_record/connection_adapters/abstract_adapter.rb:280:in
`block in log'
        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activesupport-3.2.1/lib/active_support/notifications/instrumenter.rb:20:in `instrume
nt'
        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-3.2.1/lib/active_record/connection_adapters/abstract_adapter.rb:275:in
`log'
        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-3.2.1/lib/active_record/connection_adapters/abstract_mysql_adapter.rb:2
33:in `execute'
        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-3.2.1/lib/active_record/connection_adapters/mysql2_adapter.rb:214:in `e
xecute'
        from (irb):21:in `block in irb_binding'
        from (irb):19:in `each'
        from (irb):19
        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/railties-3.2.1/lib/rails/commands/console.rb:47:in `start'
        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/railties-3.2.1/lib/rails/commands/console.rb:8:in `start'
        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/railties-3.2.1/lib/rails/commands.rb:41:in `<top (required)>'
        from script/rails:6:in `require'

由于时间.now

result = ActiveRecord::Base.connection.select_all( "SELECT * FROM invtypes" )
time = Time.now
result.each do |row|
 sql = "INSERT INTO items (typeID, name, description, volume, price, created_at, updated_at) VALUES (#{row["typeID"]}, '#{row["typeName"]}', '#{row["description"]}', #{row["volume"]}, #{row["basePrice"]}, '#{time}', '#{time}');"
 ActiveRecord::Base.connection.execute(sql)
end

我如何使用 Ruby/Rails 来解决这个问题，或者我应该用 Java 编写应用程序吗？C 来执行这个查询？

只执行 10 行然后抛出：

        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-3.2.1/lib/active_record/connection_adapters/abstract_mysql_adapter.rb:2
33:in `query'
        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-3.2.1/lib/active_record/connection_adapters/abstract_mysql_adapter.rb:2
33:in `block in execute'
        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-3.2.1/lib/active_record/connection_adapters/abstract_adapter.rb:280:in
`block in log'
        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activesupport-3.2.1/lib/active_support/notifications/instrumenter.rb:20:in `instrume
nt'
        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-3.2.1/lib/active_record/connection_adapters/abstract_adapter.rb:275:in
`log'
        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-3.2.1/lib/active_record/connection_adapters/abstract_mysql_adapter.rb:2
33:in `execute'
        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-3.2.1/lib/active_record/connection_adapters/mysql2_adapter.rb:214:in `e
xecute'
        from (irb):7:in `block in irb_binding'
        from (irb):4:in `each'
        from (irb):4
        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/railties-3.2.1/lib/rails/commands/console.rb:47:in `start'
        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/railties-3.2.1/lib/rails/commands/console.rb:8:in `start'
        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/railties-3.2.1/lib/rails/commands.rb:41:in `<top (required)>'
        from script/rails:6:in `require'
        from script/rails:6:in `<main>'
4

2 回答 2

0

循环中的 SQL 查询和插入很慢。尝试使用INSERT..SELECT，该命令将插入您使用第二条语句选择的所有行。我不知道您使用的是什么数据库，但例如，如果您使用的是 MySQL，您可以查看语句的文档。

于 2013-03-29T12:03:12.080 回答
0

你可以试试这个：

time = Time.now.to_formatted_s(:db)
于 2013-03-29T11:53:22.487 回答