Installing Rails

在windows 直接用installRails安裝

查詢版本
ruby -v, rails -v


更新版本
C:\rails_apps> gem update rails --include-dependencies
C:\rails_apps> gem cleanup
app> rake rails:update


Rails和database的階層關係

• Ruby Programming
• Ruby database adapter , Each database library have its own database-specific API, Ruby database adapter hide these differences
• Database driver , Ruby library connect low-level database API to the high-level world of ruby programming
• Database engine