MongoDB创建数据库和集合实例（多种方法创建）

加粗样式

1. 查看数据库
   使用 show dbs
2. 创建教材的library数据库
   Use library
3. 在library数据集中增加集合和文档
   使用多种方法实现对media集合中插入文档，具体数据如下：

方法1：定义变量，使用insert（）或者insertOne()当变量为参数

var document=(
{Type:"book",
Title:"Definitive Guide to MongoDB 3rd ed.,The",
ISBN:"978-1-4842-1183-0",
Publisher:"Apress",
Author:["Hows, David","Plugger,Eelco","Membrey,Peter","Hawkins,Tim"]
}
)
db.media.insert(document)

方法2：记录直接作为函数参数

db.media.insert(
{Type:"CD",
Artist:"Nirvana",
Title:"Nevemind`",
Tracklist:[
{Track:"1",
 Title:"Smells like Teen Spirit",
 Length:"5:02"
},
{Track:"2",
 Title:"In Bloom",
 Length:"4:15"
}
]
}）

方法3：使用高级语言的循环实现一次性插入多条记录

var document=[
  {Type:"book",
Title:"Definitive Guide to MongoDB 3rd ed.,The",
ISBN:"978-1-4842-1183-0",
Publisher:"Apress",
Author:["Hows, David","Plugger,Eelco","Membrey,Peter","Hawkins,Tim"]},
{Type:"CD",
Artist:"Nirvana",
Title:"Nevemind`",
Tracklist:[
 {Track:"1",
 Title:"Smells like Teen Spirit",
 Length:"5:02"},
{Track:"2",
 Title:"In Bloom",
 Length:"4:15"}
              ] }];
for(var i = 0;i<document.length;i++){
	db.media.insert(document[i])
}

方法4：使用insertMany（）函数一次性插入多行文档

db.media.insertMany([
  {Type:"book",
Title:"Definitive Guide to MongoDB 3rd ed.,The",
ISBN:"978-1-4842-1183-0",
Publisher:"Apress",
Author:["Hows, David","Plugger,Eelco","Membrey,Peter","Hawkins,Tim"]},
{Type:"CD",
Artist:"Nirvana",
Title:"Nevemind`",
Tracklist:[
 {Track:"1",
 Title:"Smells like Teen Spirit",
 Length:"5:02"},
{Track:"2",
 Title:"In Bloom",
 Length:"4:15"}] );

4. 查看集合中的文档数据
   db.media.find()
   和db.media.count()
5. 文档数据的删除
   db.media.remove({})
6. 集合的删除
   db.media.drop()
7. 数据库的删除
   在当前操作的焦点数据库下使用db.dropDatabase()