需要对数据库mongodb执行查询,从而按时间范围生成一组结果。我正在使用pymongo。我的查询如下:
query = {"$and": [
{"id_node": id_node}
{"port": port},
{"datetime": {"$gte": self.hourBegin}}
{"datetime": {"$lte": self.now}}
]}
listResults = db.mycollection.find (query)
我也尝试过这种方式:
query = {"id_node": int(id_node)
"port": port,
"datetime": {"$gte": self.hourBegin, "$lte": self.now}}
listResults = db.mycollection.find (query)
但结果总是空的。直接在mongodb中测试但结果为空。我确信数据存在于数据库中,其中包含我正在研究的时间范围。
可能结果列表:
{ "_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" }
答案 0 :(得分:4)
我访问http://www.querymongo.com/,然后创建一个查询,好像它在MySQL中,然后必须返回一个mongodb查询。像这样:
#MySQL Query
SELECT * FROM inoshare WHERE id_nome = 1 AND port = 1 AND datetime > 'hourBegin' AND datetime <= 'NOW()';
回归:
db.inoshare.find({
"id_nome": 1,
"port": 1,
"datetime": {
"$gt": "hourBegin",
"$lte": "NOW()"
}
});
然后将'hourBegin'和'NOW()'替换为变量。 谢谢所有人。