與geoQuery不同的值工作在蒙戈，但不是在春天

雖然這部作品在蒙戈：與geoQuery不同的值工作在蒙戈，但不是在春天

> db.collection.distinct("key", {"position":{$geoWithin:{$box: [[-6.8, 36.7], [-0.5, 43.8]]}}}) 
> [ "A", "B" ]

在春天返回一個錯誤

Criteria criteria = Criteria.where("position").within(box); 
     Query query = new Query(); 
     query.addCriteria(criteria); 
List<String> result = mongoOperations.getCollection("collection") 
       .distinct("key", query.getQueryObject());

java.lang.IllegalArgumentException異常：不能序列類org.springframework.data.mongodb.core.query.GeoCommand at org.bson.BasicBSONEncoder._putObjectField（BasicBSONEncoder.java:299）〜[mongo-java-driver-2.14.3.jar：na] at org.bson .BasicBSONEncoder.putObject（BasicBSONEncoder.java:194）〜[mongo-jav a-driver-2.14.3.jar：na] at org.bson.BasicBSONEncoder._putObjectField（BasicBSONEncoder.java:255）〜[mongo-java-driver-2.14.3.jar：na] at org.bson。 BasicBSONEncoder.putObject（BasicBSONEncoder.java:194）〜[mongo-java-driver-2.14.3.jar：na] at org.bson.BasicBSONEncoder._putObjectField（BasicBSONEncoder.java:255）〜[mongo-java-driver- 2.14.3.jar：na] at org.bson.BasicBSONEncoder.putObject（BasicBSONEncoder.java:194）〜[mongo-java-driver-2.14.3.jar：na] at org.bson.BasicBSONEncoder.putObject（基本BSONEncoder.java:136）〜[mongo-java-driver-2.14.3.jar：na] at com.mongodb.DefaultDBEncoder.writeObject（DefaultDBEncoder.java:36）〜[mongo-java-driver-2.14.3。 jar：na] at com.mongodb.OutMessage.putObject（OutMessage.java:289）〜[mongo-java-driver-2.14.3.jar：na] 在com.mongodb.OutMessage.writeQuery（OutMessage.java:211）〜[mongo-java-driver-2.14.3.jar：na] at com.mongodb.OutMessage.query（OutMessage.java:86）〜[mongo -java-driver-2.14.3.jar：na]

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2017-10-16 pama

我無法使@Christoph Strobl代碼甚至編譯！

我終於用蒙戈-Java的應用程序，以獲得不同的值：

MongoClient mongoClient = new MongoClient(); 
    MongoDatabase database = mongoClient.getDatabase(dbName); 
    MongoCollection<org.bson.Document> collection = database.getCollection(COLLECTION); 
    Bson query = Filters.geoWithinBox("position", 
      x1, y1, x2, y2); 

    DistinctIterable<String> resultList = collection.distinct("key", query, String.class); 

    Set resultSet = new HashSet(); 
    resultList.forEach(new Block<String>() { 
     @Override 
     public void apply(final String result) { 
      resultSet.add(result); 
     } 
    }); 

    return resultSet;

來源

2017-12-23 21:56:21 pama

我確實看到需要通過集合的操作直接通過MongoDB Java驅動程序API。但Query.getQueryObject()不能直接與底層驅動程序一起使用，因爲它由QueryMapper轉換。現在，您可以嘗試自行完成映射。

QueryMapper mapper = new QueryMapper(mongoOperations.getConverter()); 
org.bson.Document mappedQuery = mapper.getMappedObject(query.getQueryObject(), Optional.empty()); 

List<String> result = template.getCollection("collection") 
    .distinct("key", mappedQuery, String.class) 
    .into(new ArrayList<>());

還有DATAMONGO-1761（韌仍處於打開狀態）尋求爲distinct支持添加到MongoOperations。

來源

2017-10-24 08:47:01

與geoQuery不同的值工作在蒙戈，但不是在春天

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