pymongo基础：常用操作

跟表添加或更新某个字段

res = await SS_ClassRoom.update_one(
            {
                "$and": [
                    {"Class_Room_Uid": self.Class_Room_Uid},
                    {"Rucode": self.Rucode}
                ]
            }, 
            {   "$set": { 
                    "LoginStatus": ConstStatusLogout  # 0 未登录 1 登录
                }
            }
        )

在表中插入文档

newRecord = {
    "StudentMid": p["StudentMid"],
    "StudentGroupMid": p["StudentGroupMid"],
    "AttendenceType": p["AttendenceType"], #1.正常 2.迟到 3.请假 4.旷课
    "Lessons": p["Lessons"],
    "Subject": p["Subject"],
    "PublicClass": p["PublicClass"],
    "PunchDateTime": datetime.strptime(p["PunchDateTime"], "%Y-%m-%d %H:%M:%S"),
    "CreateDateTime": datetime.utcnow()
}
# 插入处理
try:
    oldRecord = await SS_AttendenceLog.find_one(filter=dupRecodFilter, sort=[('Created_Time', -1)])
    delRes = await SS_AttendenceLog.delete_many(filter=dupRecodFilter)
    newRes = await SS_AttendenceLog.insert_one(newRecord)
except Exception as ex:
    self.resData["failed"].append(p)
    continue

MongoDB的upsert状态判断和pymongo使用方法

在mongo中，有一个命令非常的方便，就是upsert，顾名思义就是update+insert的作用

根据条件判断有无记录，有的话就更新记录，没有的话就插入一条记录

upsert的使用方法：

 db.user.insert({"name":"user1", "age":12, "sex":"male"})
 db.user.insert({"name":"user2", "age":13, "sex":"male"})
 db.user.insert({"name":"user3", "age":14, "sex":"male"})

查询

db.user.find()

{ "_id" : ObjectId("54c75876662ee1617463f0a3"), "name" : "user1", "age" : 12, "sex" : "male" }
{ "_id" : ObjectId("54c75880662ee1617463f0a4"), "name" : "user2", "age" : 13, "sex" : "male" }
{ "_id" : ObjectId("54c7588d662ee1617463f0a5"), "name" : "user3", "age" : 14, "sex" : "male" }

　　

更新

db.user.update({"name":"user1"}, {"$set":{"age":21}}, {"upsert":"true"})
db.user.find()

查需结果

{ "_id" : ObjectId("54c75876662ee1617463f0a3"), "name" : "user1", "age" : 21, "sex" : "male" }
{ "_id" : ObjectId("54c75880662ee1617463f0a4"), "name" : "user2", "age" : 13, "sex" : "male" }
{ "_id" : ObjectId("54c7588d662ee1617463f0a5"), "name" : "user3", "age" : 14, "sex" : "male" }　　

　　

# 判断如果找到，就更新，没找到就执行插入的操作（这里因为找到了user1，所以只是更新，不会执行$setOneInsert这条语句）

db.user.update({"name":"user1"}, {"$set":{"age":21}, "$setOnInsert":{"sex":"female"}}, {"upsert":"true"})

db.user.find()

　　

{ "_id" : ObjectId("54c75876662ee1617463f0a3"), "name" : "user1", "age" : 21, "sex" : "male" }
{ "_id" : ObjectId("54c75880662ee1617463f0a4"), "name" : "user2", "age" : 13, "sex" : "male" }
{ "_id" : ObjectId("54c7588d662ee1617463f0a5"), "name" : "user3", "age" : 14, "sex" : "male" }

＃这里执行的的是插入的操作，因为没有找到user4

db.user.update({"name":"user4"}, {"$set":{"age":21}, "$setOnInsert":{"sex":"female"}}, {"upsert":"true"})

db.user.find()

　　

查询结果

{ "_id" : ObjectId("54c75876662ee1617463f0a3"), "name" : "user1", "age" : 21, "sex" : "male" }
{ "_id" : ObjectId("54c75880662ee1617463f0a4"), "name" : "user2", "age" : 13, "sex" : "male" }
{ "_id" : ObjectId("54c7588d662ee1617463f0a5"), "name" : "user3", "age" : 14, "sex" : "male" }
{ "_id" : ObjectId("54c75a07478a805237d087c3"), "name" : "user4", "age" : 21, "sex" : "female" }

在一个数据库中全额插入一个字段，默认的类型为int 

db.SS_School.update({},{$set: {"AttendenceType":NumberInt(1)}},{multi: true})

在mongod中使用正则进行检索 

 db.getCollection('SS_School').find({$or:[{"SchoolName":{$regex:"网络"},"SchoolId":{$regex:"340"}}]})

        if SearchFiled:
            _fiter = {"$or": [{"SchoolName": {'$regex': SearchFiled}}, {"SchoolId": {'$regex': SearchFiled}},], 'AttendenceType': 1}
            count = await School.count(filter=_fiter)
            SchoolRes = await School.find(filter=_fiter,per_page=per_page, page=page)
        else:
            _fiter = {"AttendenceType": 1}
            SchoolRes = await School.find(filter=_fiter, per_page=per_page, page=page)
            count = await School.count(filter=_fiter)

在同一个主机下，把Mongo中的一个数据库里的表复制到另一个数据库中

db.<collection_name>.find().forEach(function(d){ db.getSiblingDB('<new_database>')['<collection_name>'].insert(d); });

修改mongo中的字段名

 db.getCollection('character').update({},{$rename:{"desc":"DESC"}},false,true)

删除表中的一个字段

db.User.update({},{$unset:{'address':''}},false, true)