ROR項目中連接多個數據庫的方法, abstract_class, establish_connection

ROR項目中連接多個數據庫的方法
如何連結到舊系統的資料庫
legacy_development:<br /># ...<br />legacy_test:<br /># ...<br />legacy_production:<br /># ...<br />#就算是連到不同的database 也可以根據environment 而變<br />class LegacyClient < ActiveRecord::Base<br /> establish_connection "legacy_#{RAILS_ENV}"<br />end<br />

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The self.abstract_class = true statements tell ActiveRecord that the LegacyDb classes cannot be instantiated themselves; since they represent database connections,they are not backed by concrete tables in the database

<br />class LegacyDb < ActiveRecord::Base<br />self.abstract_class = true<br />establish_connection "legacy_#{RAILS_ENV}"<br />end<br />class LegacyClient < LegacyDb<br />end