[英]How to execute queries with both AND and OR clauses in MongoDB with Java?
I want to execute query in MongoDB 3.2 with Java Driver 3.2, which contains both $and
and $or
clauses at the same time.我想使用 Java Driver 3.2 在 MongoDB 3.2 中执行查询,它同时包含
$and
和$or
子句。
With the reference , I tried the following approach:通过参考,我尝试了以下方法:
List<Document> criteria1 = new ArrayList<>();
List<Document> criteria2 = new ArrayList<>();
criteria1.add(new Document("fetchStatus", new Document("$gte", FetchStatus.PROCESSED_NLP.getID())));
criteria1.add(new Document("fetchStatus", new Document("$lte", fetchStatusParam)));
criteria1.add(new Document("episodeID", new Document("$in", episodeIDs)));
criteria2.add(new Document("fetchStatus", new Document("$eq", PROCESSED_FETCH.getID())));
criteria2.add(new Document("isFullTextRet", new Document("$eq", false)));
BasicDBList or = new BasicDBList();
or.add(criteria1);
or.add(criteria2);
DBObject query = new BasicDBObject("$or", or);
ArrayList<Document> results = dbC_Coll.find(query).into(new ArrayList<>());
Where the criteria1
and criteria2
should be connected with $or
while within criteria1
clause the $and
should be applied.如果
criteria1
和criteria2
应该与$or
连接,而在criteria1
子句中$and
应该应用$and
。
The problem is that in MongoDB Java Driver 3.2 there is such no method and I get the Cannot resolve method find(com.mongodb.DBObject)
error.问题是在 MongoDB Java Driver 3.2 中没有这样的方法,我得到了
Cannot resolve method find(com.mongodb.DBObject)
错误。
My question:我的问题:
How can I compose a query such as (A && B) || (X && Y)
如何编写查询,例如
(A && B) || (X && Y)
(A && B) || (X && Y)
in MongoDB Java Driver 3.2? (A && B) || (X && Y)
在 MongoDB Java Driver 3.2 中?
Personally, I find it far less confusing to construct the object sequences just like U would with a JSON structure to enhance readability.就我个人而言,我发现像 U 一样使用 JSON 结构构建对象序列以增强可读性,并没有那么令人困惑。 But it's still just
Document()
wherever you see {}
and List
wherever you see []
:但它仍然只是
Document()
无论你在哪里看到{}
和List
无论你在哪里看到[]
:
Document query = new Document(
"$or", Arrays.asList(
// First document in $or
new Document(
"fetchStatus",
new Document( "$gte", FetchStatus.PROCESSED_NLP.getID() )
.append("$lte", fetchStatusParam)
)
.append("episodeID", new Document( "$in", episodeIDs)),
// Second document in $or
new Document("fetchStatus", PROCESSED_FETCH.getID())
.append("isFullTextRet", false)
)
);
Which is basically the same as:这与以下内容基本相同:
{
"$or": [
{
"fetchStatus": {
"$gte": FetchStatus.PROCESS_NLP.getID(),
"$lte": fetchStatusParam
},
"episodeID": { "$in": episodeIDs }
},
{
"fetchStatus": PROCESSED_FETCH.getID(),
"isFullTextRet": false
}
]
}
Also there is no need for "explicit" $eq
operators, since "equals" is actually the default meaning of a value assignment in a query property anyway.也不需要“显式”
$eq
运算符,因为“等于”实际上是查询属性中值分配的默认含义。
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