[英]Rmongo query function giving error
我正在嘗試使用Rmongo庫在R中連接mongodb。但是查詢功能給我錯誤。
> chn = mongoDbConnect("marketing_db", host = 'localhost', port = 27017)
> print(dbShowCollections(chn))
character(0)
> results = dbGetQuery(chn, marketing_data, {}, 0, 5)
Error in dbGetQuery(chn, marketing_data, { :
object 'marketing_data' not found
> results = dbGetQuery(chn, "marketing_data", {}, 0, 5)
Error in (function (classes, fdef, mtable) :
unable to find an inherited method for function ‘dbGetQuery’ for signature ‘"RMongo", "character", "NULL", "numeric", "numeric"’
> results = dbGetQuery(chn, "marketing_data", query = {}, skip = 0, limit = 5)
Error in (function (classes, fdef, mtable) :
unable to find an inherited method for function ‘dbGetQuery’ for signature ‘"RMongo", "character", "NULL", "numeric", "numeric"’
在我的mongodb中,marketing_db是db,marketing_data是集合
下面是mongo控制台的輸出:
> show dbs
admin 0.000GB
config 0.000GB
local 0.000GB
marketing_db 0.001GB
myblogs 0.000GB
test 0.003GB
> use marketing_db
switched to db marketing_db
> show collections
marketing_data
> db.marketing_data.count()
7414
> db.marketing_data.find().pretty().limit(1)
{
"_id" : ObjectId("5b1d65c6cc6e576297462cdc"),
"custAge" : 55,
"profession" : "admin.",
"marital" : "single"
}
我正在Windows 3.4.3和MongoDB 3.6.5中使用R
請幫助解決此錯誤。
嘗試將查詢json作為字符串傳遞:
results = dbGetQuery(chn, "marketing_data", "{}", 0, 5)
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