使用pymongo按时间范围查询mongodb

Question

需要对数据库mongodb执行查询，从而按时间范围生成一组结果。我用的是pymongo。我的查询如下：

query = {"$and": [
                     {"id_node": id_node}
                     {"port": port},
                     {"datetime": {"$gte": self.hourBegin}}
                     {"datetime": {"$lte": self.now}}
                     ]}
listResults = db.mycollection.find (query)

我也尝试过这样做：

query = {"id_node": int(id_node)
                     "port": port,
                     "datetime": {"$gte": self.hourBegin, "$lte": self.now}}
listResults = db.mycollection.find (query)

但结果总是空洞的。在mongodb中直接测试，但结果为空。我确信数据库中有我正在研究的时间范围内的数据。

可能取得的成果清单：

{ "_id" : ObjectId("543618c6e7b9914c35266128"), "lab" : "2", "port" : "A1", "id_node" : 1, "datetime" : ISODate("2014-09-26T18:28:04Z"), "valor" : "22.00", "sensor" : "2" }
{ "_id" : ObjectId("543618c6e7b9914c35266129"), "lab" : "2", "port" : "A0", "id_node" : 1, "datetime" : ISODate("2014-09-26T18:28:04Z"), "valor" : "0", "sensor" : "1" }
{ "_id" : ObjectId("543618c6e7b9914c3526612c"), "lab" : "2", "port" : "A1", "id_node" : 1, "datetime" : ISODate("2014-09-26T18:28:06Z"), "valor" : "22.00", "sensor" : "2" }
{ "_id" : ObjectId("543618c6e7b9914c3526612d"), "lab" : "2", "port" : "A0", "id_node" : 1, "datetime" : ISODate("2014-09-26T18:28:06Z"), "valor" : "0", "sensor" : "1" }
{ "_id" : ObjectId("543618c7e7b9914c35266130"), "lab" : "2", "port" : "A1", "id_node" : 1, "datetime" : ISODate("2014-09-26T18:28:08Z"), "valor" : "22.00", "sensor" : "2" }
{ "_id" : ObjectId("543618c7e7b9914c35266131"), "lab" : "2", "port" : "A0", "id_node" : 1, "datetime" : ISODate("2014-09-26T18:28:08Z"), "valor" : "0", "sensor" : "1" }
{ "_id" : ObjectId("543618c7e7b9914c35266134"), "lab" : "2", "port" : "A1", "id_node" : 1, "datetime" : ISODate("2014-09-26T18:28:10Z"), "valor" : "22.00", "sensor" : "2" }
{ "_id" : ObjectId("543618c7e7b9914c35266135"), "lab" : "2", "port" : "A0", "id_node" : 1, "datetime" : ISODate("2014-09-26T18:28:10Z"), "valor" : "0", "sensor" : "1" }
{ "_id" : ObjectId("543618c7e7b9914c35266138"), "lab" : "2", "port" : "A1", "id_node" : 1, "datetime" : ISODate("2014-09-26T18:28:12Z"), "valor" : "22.00", "sensor" : "2" }
{ "_id" : ObjectId("543618c7e7b9914c35266139"), "lab" : "2", "port" : "A0", "id_node" : 1, "datetime" : ISODate("2014-09-26T18:28:12Z"), "valor" : "0", "sensor" : "1" }

Answer 1

我访问http://www.querymongo.com/，然后像在MySQL中一样创建一个查询，然后返回一个mongodb查询。就像这样：

#MySQL Query
SELECT * FROM inoshare WHERE id_nome = 1 AND port = 1 AND datetime > 'hourBegin' AND datetime <= 'NOW()';

而回报：

db.inoshare.find({
"id_nome": 1,
"port": 1,
"datetime": {
    "$gt": "hourBegin",
    "$lte": "NOW()"
}
});

然后将变量替换为“hourBegin”和“NOW()”。谢谢大家。