Java MongoDB基本操作（查询、删除、更新等）

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MongoDB中的数据

{
    "_id": ObjectId("57c43caed4c63d7e39b5dc48"),
    "name": "张三",
    "age": 15,
    "arr": [1,2,3],
    "arrObj":[{
        "field1":"value1",
        "field2":"value2"
    }]
}
{
    "_id": ObjectId("67c43caed4c63d7e39b5dc57"),
    "name": "李四",
    "age": 16,
    "arr": [4,5,6]
}

DBCollection的获取

MongoTemplate template;
DBCollection collection = template.getDb().getCollection("colectionName");

查询

1.根据ObjectId

BasicDBObject query = new BasicDBObject("_id", new ObjectId("67c43caed4c63d7e39b5dc57"));
collection.find(query);    

2.in查询

    ArrayList<ObjectId> objectIds = new ArrayList<>();
    objectIds.add(new ObjectId("67c43caed4c63d7e39b5dc57"));
    objectIds.add(new ObjectId("6