MongoDB常用增删改查操作

#统计条数
db.wx_user_info.find().count();

#批量创建
var arr=[ ];
for (var i=1;i<=2;i++){

arr.push({"className":"com.chinaums.netpay.db.mongo.entity.WxUserInfo","nickName":i,"headImgUrl":"http://wx.qlogo.cn/mmopen/PiajxSqBRaEK7sBfOCpicSdyTMFa1P5KgxwlGMBDwql7KVicNwcnLq8ZvKibCbVejdWG2U07uzu8XVfeGGqAF9fdmw/0","userInfoJson":"{\"subscribe\":1,\"openid\":\"oOUAZvzBVqreZIl4bjPvJCTQVz5A\",\"nickname\":\"羊爱上狼11\",\"sex\":2,\"language\":\"zh_CN\",\"city\":\"武汉\",\"province\":\"湖北\",\"country\":\"中国\",\"headimgurl\":\"http:\\/\\/wx.qlogo.cn\\/mmopen\\/PiajxSqBRaEK7sBfOCpicSdyTMFa1P5KgxwlGMBDwql7KVicNwcnLq8ZvKibCbVejdWG2U07uzu8XVfeGGqAF9fdmw\\/0\",\"subscribe_time\":1476250814,\"remark\":\"\",\"groupid\":0,\"tagid_list\":[]}"});
}
db.wx_user_info.insert(arr);

#修改
for (var i=2;i>=1;i--){
    db.wx_user_info.update({"nickName":i},{"$set":{"nickName":i+1}})
}

#删除
for (var i=2;i>=1;i--){
    db.wx_user_info.remove({"nickName":i})
}

#单条查询
db.getCollection('wx_user_info').find({nickName:2.0})

#倒序查询
db.dx_user_info.find().sort({"nickName","$i"})