show collectionsdb.createCollection("mycollection")db.createCollection("mycol", {capped:true,autoIndexID:true,size:6142800,max:10000})db.mycollection.drop()
CRUD
# insertdb.test.insert({"name":"mongodb"})db.test.insert({"name":"mongodb3.4"})# removedb.test.remove({"name":"mongodb"})# updatedb.test.update({"name":"mongodb3.4"}, {$set:{"name":"MongoDB3.4"}})# finddb.test.find()db.test.find().PRetty()# 等于db.test.find({"name":"MongoDB"})# 小于 age < 50db.test.find({"age":{$lt:50}})# 小于或等于 age <= 50db.test.find({"age":{$lte:50}})# 大于 age > 50db.test.find({"age":{$gt:50}})# 大于或等于 age >= 50db.test.find({"age":{$gte:50}})# 不等于 age != 50db.test.find({"age":{$ne:50}})
