Question

我正在尝试将我的sqlite3数据库迁移到Postgresql（我正在关注Railscasts＃342，但我正在使用ubuntu）。在我的rake db:create:all数据库上aperitime_development之后，我启动了带有Taps的Sinatra服务器（推送mi sqlite3 db），但是当我尝试做的时候

taps pull postgres://willy:piero@localhost/aperitime_development http://willy:ciao@localhost:5000'

数据不会复制到postgres db上，并且控制台无法正常终止：

Receiving schema
Schema:          0% |                                          | ETA:  --:--:--
Schema:         25% |==========                                | ETA:  00:00:07
Schema:         50% |=====================                     | ETA:  00:00:03
Schema:         75% |===============================           | ETA:  00:00:01
Schema:        100% |==========================================| Time: 00:00:04
Receiving data
4 tables, 800 records
/usr/lib/ruby/gems/1.9.1/gems/sequel-3.20.0/lib/sequel/adapters/postgres.rb:175:in 'async_exec': PG::Error: ERROR:  integer out of range (Sequel::DatabaseError)
from /usr/lib/ruby/gems/1.9.1/gems/sequel-3.20.0/lib/sequel/adapters/postgres.rb:175:in `block (2 levels) in execute'
from /usr/lib/ruby/gems/1.9.1/gems/sequel-3.20.0/lib/sequel/database/logging.rb:28:in `log_yield'
from /usr/lib/ruby/gems/1.9.1/gems/sequel-3.20.0/lib/sequel/adapters/postgres.rb:175:in `block in execute'
from /usr/lib/ruby/gems/1.9.1/gems/sequel-3.20.0/lib/sequel/adapters/postgres.rb:158:in `check_disconnect_errors'
from /usr/lib/ruby/gems/1.9.1/gems/sequel-3.20.0/lib/sequel/adapters/postgres.rb:175:in `execute'

和错误继续。

任何想法？

那是我的database.yml

development:
adapter: postgresql
encoding: unicode
database: aperitime_development
pool: 5
username: willy
password: piero

test:
adapter: postgresql
encoding: unicode
database: aperitime_test
pool: 5
username: willy
password: piero

这是我的schema.rb

ActiveRecord::Schema.define(:version => 20120630154954) do

create_table "locals", :force => true do |t|
t.string   "nome"
t.string   "indirizzo"
t.text     "descrizione"
t.integer  "Tel", :limit => 8
t.integer  "voto"
t.string   "mappa"
t.datetime "created_at",  :null => false
t.datetime "updated_at",  :null => false
end

create_table "users", :force => true do |t|
t.string   "nome"
t.string   "email"
t.datetime "created_at",                         :null => false
t.datetime "updated_at",                         :null => false
t.string   "password_digest"
t.string   "remember_token"
t.boolean  "admin",           :default => false
end

add_index "users", ["email"], :name => "index_users_on_email", :unique => true
add_index "users", ["remember_token"], :name => "index_users_on_remember_token"

end

Answer 1

当您声明时，这是您迁移中的神奇咒语柱：

create_table :example do |t|  
 t.integer :field, :limit => 8 
end

在

：limit =＆gt;在这种情况下，8是魔术，因为postgres只签名   当你说整数时，4字节整数。这使用8字节签名   整数。
     保罗鲁贝尔

Answer 2

Tel列设置为整数，一些数据溢出postgresql的整数类型通常我看到电话号码存储为数据库中的字符串。因为在某些时候你可能需要一个不能作为int工作的扩展或类似的东西。

要在posgresql中将现有表从整数更改为字符，请使用以下内容创建迁移。

def up 
    execute <<-SQL
        ALTER TABLE locals ALTER COLUMN Tel type character varying(255)
    SQL
end

这应该将列类型更改为rails默认字符串表示形式。它还应该转换现有的整数。但一定要测试。

通过点击错误拉入Sqlite3到Postgresql的迁移

2 个答案: