MongoDB实现增删改查

db..insert()
db.students.insert({name:"唐僧",age:60,gender:"M"})

db.students.insert([{name:"猪八戒",age:53,gender:"M"},{name:"沙僧",age:50,gender:"M"}])

db.students.insert({_id:"001",name:"白骨精",age:60,gender:"W"})

db.students.insertOne({_id:"002",name:"铁扇公主 ",age:60,gender:"W"})

db.students.insertMany([{_id:"004",name:"牛魔王",age:60,gender:"M"},{_id:"005",name:"红孩儿",age:60,gender:"M"}])

db.students.find();
db.students.find({});

db.students.find({_id:"002"});

db.students.find({_id:"002",name:"刘德华"});

db.students.find({_id:"002"}).count(); ----查看查询的文档的数量

db.students.find({_id:"002"}).length();

db.students.findOne({name:"aideHua"});

db.students.update({_id:"004"},{$set:{age:180}})

db.students.update({_id:"004"},{$set:{age:880}},{multi:true})

db.students.updateMany({_id:"004"},{$set:{age:180}})

db.students.updateOne({_id:"004"},{$set:{age:180}})

db.students.remove({name:"Liming"})

db.students.remove({name:"Liming"},true)

db.students.remove()；//报错

db.students.remove({});

db.students.drop();

db.students.deleteOne({name:"Liming"})

db.students.deleteMany({name:"Liming"})