测试数据库,库名mydb,集合名student
{"_id":{"$oid":"5d29fd151dfa24b300966f35"},"id":{"$numberLong":"1"},"name":"小红","score":80,"interest":"足球","grade":1}
{"_id":{"$oid":"5d29fd151dfa24b300966f36"},"id":{"$numberLong":"2"},"name":"小华","score":88,"interest":"篮球","grade":1}
{"_id":{"$oid":"5d29fd151dfa24b300966f37"},"id":{"$numberLong":"3"},"name":"小明","score":90,"interest":"羽毛球","grade":2}
{"_id":{"$oid":"5d29fd151dfa24b300966f38"},"id":{"$numberLong":"4"},"name":"小李","score":85,"interest":"乒乓球","grade":2}
{"_id":{"$oid":"5d29fd151dfa24b300966f39"},"id":{"$numberLong":"5"},"name":"小花","score":95,"interest":"象棋","grade":2}
{"_id":{"$oid":"5d29fd151dfa24b300966f3a"},"id":{"$numberLong":"6"},"name":"小爱","score":87,"interest":"羽毛球","grade":3}
{"_id":{"$oid":"5d29fd151dfa24b300966f3b"},"id":{"$numberLong":"7"},"name":"小冰","score":80,"interest":"乒乓球","grade":3}
{"_id":{"$oid":"5d29fd151dfa24b300966f3c"},"id":{"$numberLong":"8"},"name":"小张","score":92,"interest":"跑步","grade":4}
{"_id":{"$oid":"5d29fd151dfa24b300966f3d"},"id":{"$numberLong":"9"},"name":"小绿","score":77,"interest":"书法","grade":5}
{"_id":{"$oid":"5d29fd151dfa24b300966f3e"},"id":{"$numberLong":"10"},"name":"小纯","score":82,"interest":"钓鱼","grade":5}
{"_id":{"$oid":"5d29fd151dfa24b300966f3f"},"id":{"$numberLong":"11"},"name":"小紫","score":88,"interest":"品茶","grade":1}
{"_id":{"$oid":"5d29fd151dfa24b300966f40"},"id":{"$numberLong":"12"},"name":"小伟","score":98,"interest":"围棋","grade":2}