MongoDB一對多儲存

一個針對於顧客和其多個地址關係建模的一個例子

分別使用正常化(引用)和非正常化(內嵌)儲存：

1、正常化儲存：

(在一個正常化的資料模型中， address 文檔包含一個對父文檔 patron 的引用)：

{   _id: "joe",   name: "Joe Bookreader"}{   patron_id: "joe",   street: "123 Fake Street",   city: "Faketon",   state: "MA",   zip: "12345"}{   patron_id: "joe",   street: "1 Some Other Street",   city: "Boston",   state: "MA",   zip: "12345"}

2、非正常化儲存：

(把 address 資料直接內嵌到 patron 文檔裡面)

{   _id: "joe",   name: "Joe Bookreader",   addresses: [                {                  street: "123 Fake Street",                  city: "Faketon",                  state: "MA",                  zip: "12345"                },                {                  street: "1 Some Other Street",                  city: "Boston",                  state: "MA",                  zip: "12345"                }              ] }