haoman 发表于 2017-12-15 15:40:05

MongoDB学习第三篇

  一、shell操作mongodb
  1.新增一条数据 :db.collection.insertOne(‘json对象’)
  eg:
  

db.inventory.insertOne(  { item:
"canvas", qty: 100, tags: ["cotton"],>
)  

  2.新增多条数据 :db.collection.insertMany(‘json数组’)
  eg:
  

db.inventory.insertMany([  { item:
"journal", qty: 25, tags: ["blank", "red"],>{ item: "mat", qty: 85, tags: ["gray"],>{ item: "mousepad", qty: 25, tags: ["gel", "blue"],>
])  

  3.新增一条或多条数据: db.collection.insert('数据')
  eg:
  

db.inventory.insert(  { item:
"canvas", qty: 100, tags: ["cotton"],>
)  

  一、python操作mongodb(pymongo模块)
  1.导入模块并连接数据库
  

import pymongo  

  
# 获取链接
  
connect
=pymongo.MongoClient("127.0.0.1",27017)  

  
# 获取数据库
  
db_Malcolm
= connect.malcolm  

  
# 获取表
  
collection
= db_Malcolm.malcolm  

  2.insert操作
  1)插入一条记录
  

db.inventory.insert_one(  {
"item": "canvas","qty": 100,"tags": ["cotton"],"size": {"h": 28, "w": 35.5, "uom": "cm"}})  

  2)插入多条记录
  

db.inventory.insert_many([  {
"item": "journal","qty": 25,"tags": ["blank", "red"],"size": {"h": 14, "w": 21, "uom": "cm"}},  {
"item": "mat","qty": 85,"tags": ["gray"],"size": {"h": 27.9, "w": 35.5, "uom": "cm"}},  {
"item": "mousepad","qty": 25,"tags": ["gel", "blue"],"size": {"h": 19, "w": 22.85, "uom": "cm"}}])  

  3)新增一条或多条记录
  

collection.insert({"name":"Malcolm","age":34,"address":"台湾 台北","role":"programmer"})   

  一、java操作mongodb
  java需要导入mongodb-driver-3.4.2.jar 和 mongo-java-driver-3.4.2.jar 包
  1.插入一个document:
  

Document canvas = new Document("item", "canvas")  .append(
"qty", 100)  .append(
"tags", singletonList("cotton"));  

  
Document>= new Document("h", 28)  .append(
"w", 35.5)  .append(
"uom", "cm");  
canvas.put(
"size",>

  
collection.insertOne(canvas);
  

  2.插入多个document:
  

Document journal = new Document("item", "journal")  .append(
"qty", 25)  .append(
"tags", asList("blank", "red"));  

  
Document journalSize
= new Document("h", 14)  .append(
"w", 21)  .append(
"uom", "cm");  
journal.put(
"size", journalSize);  

  
Document mat
= new Document("item", "mat")  .append(
"qty", 85)  .append(
"tags", singletonList("gray"));  

  
Document matSize
= new Document("h", 27.9)  .append(
"w", 35.5)  .append(
"uom", "cm");  
mat.put(
"size", matSize);  

  
Document mousePad
= new Document("item", "mousePad")  .append(
"qty", 25)  .append(
"tags", asList("gel", "blue"));  

  
Document mousePadSize
= new Document("h", 19)  .append(
"w", 22.85)  .append(
"uom", "cm");  
mousePad.put(
"size", mousePadSize);  

  
collection.insertMany(asList(journal, mat, mousePad));
  

  Insert操作:
  1.如果collection不存在,会自动创建此collection
  2._id 字段:在MongoDB中,每一个存储到collection中的记录称之为文档。 每一个文档都需要把唯一的 _id 字段当做主键。如果插入的文档没有 _id字段,系统会自动创建。
  3.在MongoDB中,所有的写操作在单文档级别都是自动提交的,
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