08

插入张瓜赵四

db.Person.insert({"name":"张瓜","age":10})WriteResult({"nInserted":1})

db.Person.insert({"name":"赵四","age":20})WriteResult({"nInserted":1})

查询张瓜

> db.Person.find({"name":"张瓜"}){"_id":ObjectId("5617275737a5aa2cafdb4b84"),"name":"张瓜","age":10}>

查询所有信息

db.Person.find()

{"_id":ObjectId("5617277b37a5aa2cafdb4b85"),"name":"赵四","age":20}{"_id":ObjectId("56172d069d1af21ad1f769c7"),"name":"张瓜","age":40}

改张瓜年龄

db.Person.update({"name":"张瓜"}, {"name":"张瓜","age":40})WriteResult({"nMatched":1,"nUpserted":0,"nModified":1})

查询张瓜此时年龄变成40

db.Person.find({"name":"张瓜"})                                          {"_id":ObjectId("56172d069d1af21ad1f769c7"),"name":"张瓜","age":40}

删除

db.Person.remove({"name":"张瓜"})WriteResult({"nRemoved":1})>

db.Person.find()

此时已删除张瓜，显示赵四信息

{"_id":ObjectId("5617277b37a5aa2cafdb4b85"),"name":"赵四","age":20}