张波的技术积累

产品表: { _id: new ObjectId("4c4b1476238d3b4dd5003981"), slug:"wheel-barrow-9092", sku: "9092", name:"Extra Large Wheel Barrow", description: "Heavy duty wheelbarrow...", details: { weight: 47, weight_u

package com.mongodb; import java.net.UnknownHostException; import com.mongodb.util.JSON; public class Test1 { public static void main(String[] args) throws UnknownHostException { Mongo mongo

Sql Mongodb SELECT * FROM users Db.users.find() SELECT a,b FROM users Db.users.find({},{a:1,b:1}) SELECT * FROM users WHERE age=33 Db.users.find({age:33}