带$ in的mongodb聚合查询的Java代码 [英] Java code for mongodb aggregation query with $in

问题描述

我是mongodb的新手，下面需要使用Java中的等效代码

I am new to mongodb and need an equivalent code in java for the below

db.asset.aggregate([{
            $unwind : '$asset'
        }, {
            $match : {
                'asset.status' : {
                    $in : ['1', '2', '3']
                },
                'asset.siteid' : {
                    $in : ['123']
                }
            }
        }
    ]).pretty()

我尝试了以下操作，但没有帮助

I tried the following but it didn't help-out

    DBObject unwind = new BasicDBObject("$unwind", "$dp.asset");
    DBObject match  = BasicDBObjectBuilder.start().push("$match")
                  .push("dp.asset.status").add("$in", ['ACTIVE', 'LIMITEDUSE', 'OPERATING'])
                  .push("dp.asset.siteid").add("$in", ['BEDFORD']).get();

    AggregationOutput aggr = collection.aggregate(Arrays.asList(unwind, match));

注意:我正在使用mongodb 3.4.1

推荐答案

不确定传递数组值时为什么要使用单引号.

Not sure why you are using single quotes while passing the array value.

传递值的正确语法是

 DBObject match  = BasicDBObjectBuilder.start().push("$match")
             .push("$dp.asset.status").add("$in", Arrays.asList("ACTIVE", "LIMITEDUSE", "OPERATING"))
             .push("$dp.asset.siteid").add("$in", Arrays.asList("BEDFORD")).get();

或

DBObject match  = BasicDBObjectBuilder.start().push("$match")
             .push("$dp.asset.status").add("$in", new String[]{"ACTIVE", "LIMITEDUSE", "OPERATING"})
             .push("$dp.asset.siteid").add("$in", new String[]{"BEDFORD"}).get();

对于3.x驱动程序，您应该使用文档.

For 3.x drivers, you should be using Document.

Document unwind = new Document("$unwind", "$dp.asset");
Document match  = new Document("$match", new Document("$dp.asset.status", new Document("$in", new String[]{"ACTIVE", "LIMITEDUSE", "OPERATING"})).
             append("$dp.asset.siteid", new Document("$in", new String[]{"BEDFORD"})));

Mongo查询代码.

Code for Mongo Query.

 Document unwind = new Document("$unwind", "$asset");
 Document match  = new Document("$match", new Document("$asset.status", new Document("$in", new String[]{"1", "2", "3"})).
         append("$asset.siteid", new Document("$in", new String[]{"123"})));

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