MongoDB資料存放區建模

MongoDB常用資料建模方式：1)文檔關係建模，2)樹結構建模

模型：
|-- 1、文檔關係建模
| |-- 1)內嵌文檔模型
| |-- 2)內嵌文檔模型 
|-- 2、樹結構建模
|-- 1)父文檔引用
|-- 2)子文檔引用 
|-- 3)祖先數組
|-- 4)物化路徑 
|-- 5)嵌套集合 

以下記錄了常用的建模及每一種模型的具體相關範例程式碼： 一、文檔關係建模：
1)內嵌文檔模型

{   _id: "joe",   name: "Joe Bookreader",   address: {              street: "123 Fake Street",              city: "Faketon",              state: "MA",              zip: "12345"            }}

2)文檔引用模型

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

二、樹結構建模

樹形業務結構圖：

(註：引用自mongodb中文官網圖)

1)父文檔引用

db.categories.insert( { _id: "MongoDB", parent: "Databases" } )db.categories.insert( { _id: "dbm", parent: "Databases" } )db.categories.insert( { _id: "Databases", parent: "Programming" } )db.categories.insert( { _id: "Languages", parent: "Programming" } )db.categories.insert( { _id: "Programming", parent: "Books" } )db.categories.insert( { _id: "Books", parent: null } )

2)子文檔引用

db.categories.insert( { _id: "MongoDB", children: [] } )db.categories.insert( { _id: "dbm", children: [] } )db.categories.insert( { _id: "Databases", children: [ "MongoDB", "dbm" ] } )db.categories.insert( { _id: "Languages", children: [] } )db.categories.insert( { _id: "Programming", children: [ "Databases", "Languages" ] } )db.categories.insert( { _id: "Books", children: [ "Programming" ] } )

3)祖先數組

db.categories.insert( { _id: "MongoDB", ancestors: [ "Books", "Programming", "Databases" ], parent: "Databases" } )db.categories.insert( { _id: "dbm", ancestors: [ "Books", "Programming", "Databases" ], parent: "Databases" } )db.categories.insert( { _id: "Databases", ancestors: [ "Books", "Programming" ], parent: "Programming" } )db.categories.insert( { _id: "Languages", ancestors: [ "Books", "Programming" ], parent: "Programming" } )db.categories.insert( { _id: "Programming", ancestors: [ "Books" ], parent: "Books" } )db.categories.insert( { _id: "Books", ancestors: [ ], parent: null } )

4)物化路徑

db.categories.insert( { _id: "Books", path: null } )db.categories.insert( { _id: "Programming", path: ",Books," } )db.categories.insert( { _id: "Databases", path: ",Books,Programming," } )db.categories.insert( { _id: "Languages", path: ",Books,Programming," } )db.categories.insert( { _id: "MongoDB", path: ",Books,Programming,Databases," } )db.categories.insert( { _id: "dbm", path: ",Books,Programming,Databases," } )

5)嵌套集合

db.categories.insert( { _id: "Books", parent: 0, left: 1, right: 12 } )db.categories.insert( { _id: "Programming", parent: "Books", left: 2, right: 11 } )db.categories.insert( { _id: "Languages", parent: "Programming", left: 3, right: 4 } )db.categories.insert( { _id: "Databases", parent: "Programming", left: 5, right: 10 } )db.categories.insert( { _id: "MongoDB", parent: "Databases", left: 6, right: 7 } )db.categories.insert( { _id: "dbm", parent: "Databases", left: 8, right: 9 } )