mongdb "errmsg" : "exception: 'out' has to be a string or an object"
解决"errmsg" : "exception: 'out' has to be a string or an object"
map=function (){ for(var key in this){ emit(key, {count:1}); }}
reduce=function (key, emits){ total=0; for(var i in emits){ total+=emits[i].count; } return{"count":total}; }
?
> r=db.runCommand({"mapreduce":"users", "map":map,"reduce":reduce})
{
"errmsg" : "exception: 'out' has to be a string or an object",
"code" : 13606,
"ok" : 0
?
}
在mongodb-src-r2.4.5版本中需要指定out才能正常查询数据
> r=db.runCommand({"mapreduce":"users", "map":map,"reduce":reduce,"out":"sss"})
{
"result" : "sss",
"timeMillis" : 6,
"counts" : {
"input" : 3,
"emit" : 12,
"reduce" : 4,
"output" : 4
},
"ok" : 1
}
?
