我正在寻找一种方法来改变数组中只有1个整数的值。 我不想获取整个数组，更改值并将其重新放回，因为另一个线程可以更改整数的值。
[
{
"row 1": [
0,
0,
0,
0,
0
],
"row 2": [
0,
0,
0,
0,
0
],
"row 3": [
0,
0,
0,
0,
0
],
"row 4": [
0,
0,
0,
0,
0
],
"row 5": [
0,
0,
0,
0,
0
],
"row 6": [
0,
0,
0,
0,
0
],
"row 7": [
0,
0,
0,
0,
0
],
"row 8": [
0,
0,
0,
0,
0
]
}
]
这是“showInstance”文档中的“席位”文档，“showInstance”文档位于“show”文档中。
这是展示文件
{
"_id": 1,
"name": "Great rock show",
"description": "The party will roll all night long during the North American WorldWired tour as we’re psyched to announce that award-winning DJ and producer Mix Master Mike will be spinning some of your favorite (and ours!) hard rock and metal tracks throughout the evening at all of the stadium dates this summer. A pioneer in the hip-hop and DJ communities, you’ll be able to catch his skillful, hard-hitting scratch work once the doors open each night and between acts before we hit the stage.",
"band_id": 3,
"instances": [
{
"_id": {
"$oid": "58cea4779f3489310471b7db"
},
"date": {
"$date": "2017-04-07T15:00:00.000Z"
},
"price": 140,
"theater_id": 3,
"seats": [
{
"row 1": [
0,
0,
0,
0,
0
],
"row 2": [
0,
0,
0,
0,
0
],
"row 3": [
0,
0,
0,
0,
0
],
"row 4": [
0,
0,
0,
0,
0
],
"row 5": [
0,
0,
0,
0,
0
],
"row 6": [
0,
0,
0,
0,
0
],
"row 7": [
0,
0,
0,
0,
0
],
"row 8": [
0,
0,
0,
0,
0
]
}
]
},
{
"_id": {
"$oid": "58cea4779f3489310471b7dc"
},
"date": {
"$date": "2017-05-04T15:00:00.000Z"
},
"price": 758,
"theater_id": 5,
"seats": [
{
"row 1": [
0,
0,
0,
0,
0,
0
],
"row 2": [
0,
0,
0,
0,
0,
0
],
"row 3": [
0,
0,
0,
0,
0,
0
],
"row 4": [
0,
0,
0,
0,
0,
0
],
"row 5": [
0,
0,
0,
0,
0,
0
],
"row 6": [
0,
0,
0,
0,
0,
0
],
"row 7": [
0,
0,
0,
0,
0,
0
],
"row 8": [
0,
0,
0,
0,
0,
0
],
"row 9": [
0,
0,
0,
0,
0,
0
],
"row 10": [
0,
0,
0,
0,
0,
0
]
}
]
},
{
"_id": {
"$oid": "58cea4779f3489310471b7dd"
},
"date": {
"$date": "2017-05-23T15:00:00.000Z"
},
"price": 634,
"theater_id": 9,
"seats": [
{
"row 1": [
0,
0,
0,
0,
0
],
"row 2": [
0,
0,
0,
0,
0
],
"row 3": [
0,
0,
0,
0,
0
],
"row 4": [
0,
0,
0,
0,
0
]
}
]
},
{
"_id": {
"$oid": "58cea4779f3489310471b7de"
},
"date": {
"$date": "2017-06-02T15:00:00.000Z"
},
"price": 398,
"theater_id": 3,
"seats": [
{
"row 1": [
0,
0,
0,
0,
0
],
"row 2": [
0,
0,
0,
0,
0
],
"row 3": [
0,
0,
0,
0,
0
],
"row 4": [
0,
0,
0,
0,
0
],
"row 5": [
0,
0,
0,
0,
0
],
"row 6": [
0,
0,
0,
0,
0
],
"row 7": [
0,
0,
0,
0,
0
],
"row 8": [
0,
0,
0,
0,
0
]
}
]
},
{
"_id": {
"$oid": "58cea4779f3489310471b7df"
},
"date": {
"$date": "2017-06-29T15:00:00.000Z"
},
"price": 36,
"theater_id": 9,
"seats": [
{
"row 1": [
0,
0,
0,
0,
0
],
"row 2": [
0,
0,
0,
0,
0
],
"row 3": [
0,
0,
0,
0,
0
],
"row 4": [
0,
0,
0,
0,
0
]
}
]
},
{
"_id": {
"$oid": "58cea4779f3489310471b7e0"
},
"date": {
"$date": "2017-08-08T15:00:00.000Z"
},
"price": 377,
"theater_id": 11,
"seats": [
{
"row 1": [
0,
0,
0,
0,
0,
0,
0,
0,
0,
0
],
"row 2": [
0,
0,
0,
0,
0,
0,
0,
0,
0,
0
],
"row 3": [
0,
0,
0,
0,
0,
0,
0,
0,
0,
0
],
"row 4": [
0,
0,
0,
0,
0,
0,
0,
0,
0,
0
],
"row 5": [
0,
0,
0,
0,
0,
0,
0,
0,
0,
0
],
"row 6": [
0,
0,
0,
0,
0,
0,
0,
0,
0,
0
],
"row 7": [
0,
0,
0,
0,
0,
0,
0,
0,
0,
0
],
"row 8": [
0,
0,
0,
0,
0,
0,
0,
0,
0,
0
],
"row 9": [
0,
0,
0,
0,
0,
0,
0,
0,
0,
0
],
"row 10": [
0,
0,
0,
0,
0,
0,
0,
0,
0,
0
]
}
]
},
{
"_id": {
"$oid": "58cea4779f3489310471b7e1"
},
"date": {
"$date": "2017-08-28T15:00:00.000Z"
},
"price": 885,
"theater_id": 12,
"seats": [
{
"row 1": [
0,
0,
0,
0,
0,
0,
0
],
"row 2": [
0,
0,
0,
0,
0,
0,
0
],
"row 3": [
0,
0,
0,
0,
0,
0,
0
],
"row 4": [
0,
0,
0,
0,
0,
0,
0
],
"row 5": [
0,
0,
0,
0,
0,
0,
0
],
"row 6": [
0,
0,
0,
0,
0,
0,
0
],
"row 7": [
0,
0,
0,
0,
0,
0,
0
],
"row 8": [
0,
0,
0,
0,
0,
0,
0
],
"row 9": [
0,
0,
0,
0,
0,
0,
0
],
"row 10": [
0,
0,
0,
0,
0,
0,
0
],
"row 11": [
0,
0,
0,
0,
0,
0,
0
],
"row 12": [
0,
0,
0,
0,
0,
0,
0
]
}
]
},
{
"_id": {
"$oid": "58cea4779f3489310471b7e2"
},
"date": {
"$date": "2017-09-26T15:00:00.000Z"
},
"price": 853,
"theater_id": 3,
"seats": [
{
"row 1": [
0,
0,
0,
0,
0
],
"row 2": [
0,
0,
0,
0,
0
],
"row 3": [
0,
0,
0,
0,
0
],
"row 4": [
0,
0,
0,
0,
0
],
"row 5": [
0,
0,
0,
0,
0
],
"row 6": [
0,
0,
0,
0,
0
],
"row 7": [
0,
0,
0,
0,
0
],
"row 8": [
0,
0,
0,
0,
0
]
}
]
}
],
}
}
}
答案 0 :(得分：0)
如果您知道元素位置，则可以使用它来更新值，例如
BasicDBObject setQuery = new BasicDBObject("$set", new BasicDBObject("instances.$.seats.0.row 1.0", 1));
collection.update(someSearchQuery, setQuery);
<强>更新
以下是查询和更新的示例：
DBCollection collection = db.getCollection("shows");
BasicDBObject query = new BasicDBObject("_id", 1);
query.put("instances._id", new ObjectId("58cea4779f3489310471b7db"));
BasicDBObject setQuery = new BasicDBObject("$set", new BasicDBObject("instances.$.seats.0.row 1.0", 1));
collection.update(query, setQuery);
Mongo查询
db.seats.update({"_id":1,"instances._id": ObjectId("58cea4779f3489310471b7db")}, {$set : {"instances.$.seats.0.row 1.0" : 100}})
上面的查询应该将“row 1”元素更新为100，我也更新了java exaple。