1
我是MongoDB的新手。我在loginCollection.aggregate
得到一个错误,指出:类型MongoCollection <Document>中的方法聚合(List <?extends Bson>)不适用于参数(BasicDBObject)
在类型MongoCollection的方法汇总(表)不适用的参数(BasicDBObject)
以下是我的代码片段。提前致谢。
public MonthlyLoginCount monthlyLoginCount() {
MonthlyLoginCount monthlyLoginCount = new MonthlyLoginCount();
Map<String, Long> map = new HashMap<String, Long>();
MongoClient mongo = new MongoClient(dataSource, 27017);
MongoCollection<Document> loginCollection = mongo.getDatabase(mongoDataBase).getCollection(loginDetailsCollection);
AggregationOutput logincount = loginCollection.aggregate(new BasicDBObject("$group",
new BasicDBObject("_id", "$email_id").append("value", new BasicDBObject("$push", "$value"))));
Iterator<DBObject> results = logincount.results().iterator();
while (results.hasNext()) {
try {
Object str = results.next().get("_id");
long count = loginCollection.count(new BasicDBObject("email_id", str.toString()));
System.out.println("email id:: " + str.toString() + " count: " + count);
map.put(str.toString(), count);
} catch (Exception e) {
e.printStackTrace();
}
}
mongo.close();
monthlyLoginCount.setMap(map);
return monthlyLoginCount;
}