CURD

insert

db.collection.insertOne()
db.collection.insertMany()

db.fruits.insertOne({name:"apple"})
db.fruits.insertMany([
{name:"apple"},
{name:"pear"}
])

find

单条件查询：db.movies.find({"year":1997})
多条件与查询：
db.movies.find({"year":1997,"type":"action"}) 或 db.movies.find({$and:[{"year":1997}, {"type":"action"}]})
多条件或查询：
db.movies.find({$or:[{"year":1997},{"type":"action"}]})
正则表达式查询：
db.movies.find({"title":/^B/})

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