我很难将MongoDB聚合查询转换为Java。我能够在Mongo shell中获得结果,但不能在Java中获得结果......
db.intentAnalysisPojo.aggregate(
{"$match": { "threadId": "f5683604-9fc8-40dd-9b7b-a1ef8e3bdb02"} },
{ "$group": {
"_id":"$question",
"answer": { "$first": "$answer" },
"intent": { "$first": "$intent" },
"wdsAns1":{"$first": "$wdsAns1"},
"wdsAns2":{"$first": "$wdsAns2"},
"wdsAns3":{"$first": "$wdsAns3"},
}},
{ "$sort" : { "intent" : 1}}
);
我尝试过这个Java代码,但它没有用......
Document firstGroup = new Document("$group",
new Document("_id", "$question")
.append("$first", "$answer")
.append("$first", "$intent")
.append("$first", "$wdsAns1")
.append("$first", "$wdsAns2")
.append("$first", "$wdsAns3"));
AggregationOperation match = Aggregation.match(Criteria.where("threadId").is(uuid));
AggregationOperation group = Aggregation.group(firstGroup.toJson());
AggregationOperation sort = Aggregation.sort(Sort.Direction.ASC, "intent");
由于
答案 0 :(得分:0)
在您的问题中,MongoDB Java驱动程序等效于MongoDB shell命令:
MongoClient mongoClient = ...;
MongoCollection<Document> collection = mongoClient.getDatabase("...").getCollection("...");
List<Document> documents = collection.aggregate(Arrays.asList(
// {"$match": { "threadId": "f5683604-9fc8-40dd-9b7b-a1ef8e3bdb02"} }
Aggregates.match(new Document("threadId", "f5683604-9fc8-40dd-9b7b-a1ef8e3bdb02")),
// { "$group": { "_id":"$question", "answer": { "$first": "$answer" }, "intent": { "$first": "$intent" }, "wdsAns1":{"$first": "$wdsAns1"}, "wdsAns2":{"$first": "$wdsAns2"}, "wdsAns3":{"$first": "$wdsAns3"} }}
new Document("$group",
new Document("_id", "$question")
.append("answer", new Document("$first", "$answer"))
.append("intent", new Document("$first", "$intent"))
.append("wdsAns1", new Document("$first", "$wdsAns1"))
.append("wdsAns2", new Document("$first", "$wdsAns2"))
.append("wdsAns3", new Document("$first", "$wdsAns3"))
),
// { "$sort" : { "intent" : 1} }
Aggregates.sort(new Document("$sort", new Document("intent", new BsonInt32(1)))))
).into(new ArrayList<>());
for (Document document : documents) {
logger.info("{}", document.toJson());
}
注意:
new Document("$group", ...)
惯用法而不是Aggregates.group()
实用程序来帮助澄清shell命令与Java等效项之间的转换。