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[英]How to perform a bulk update of documents with multiple filters in MongoDB 3 with Java
[英]How to perform a bulk update of documents in MongoDB with Java?
我正在使用 MongoDB 3.2 和 MongoDB Java 驅動程序 3.2。 我有一個包含數百個更新文檔的數組,這些文檔現在應該保存/存儲在 MongoDB 中。 為了做到這一點,我遍歷數組並為該數組中的每個文檔調用updateOne()
方法。
現在,我想通過批量更新重新實現這個邏輯。 我試圖在 MongoDB 3.2 中使用 MongoDB Java Driver 3.2 找到批量更新的示例。
我試過這個代碼:
MongoClient mongo = new MongoClient("localhost", 27017);
DB db = (DB) mongo.getDB("test1");
DBCollection collection = db.getCollection("collection");
BulkWriteOperation builder = collection.initializeUnorderedBulkOperation();
builder.find(new BasicDBObject("_id", 1001)).upsert()
.replaceOne(new BasicDBObject("_id", 1001).append("author", "newName"));
builder.execute();
但似乎這種方法基於過時的 MongoDB Java Driver,例如 2.4,並使用了不推薦使用的方法。
我的問題:
如何使用 MongoDB Java Driver 3.2 對 MongoDB 3.2 中的文檔執行批量更新?
使用新的bulkWrite()
API 手冊中的示例,考慮以下包含以下文檔的測試集合:
{ "_id" : 1, "char" : "Brisbane", "class" : "monk", "lvl" : 4 },
{ "_id" : 2, "char" : "Eldon", "class" : "alchemist", "lvl" : 3 },
{ "_id" : 3, "char" : "Meldane", "class" : "ranger", "lvl" : 3 }
以下bulkWrite()
對characters
集合執行多項操作:
蒙戈外殼:
try {
db.characters.bulkWrite([
{
insertOne:{
"document":{
"_id" : 4, "char" : "Dithras", "class" : "barbarian", "lvl" : 4
}
}
},
{
insertOne:{
"document": {
"_id" : 5, "char" : "Taeln", "class" : "fighter", "lvl" : 3
}
}
},
{
updateOne: {
"filter" : { "char" : "Eldon" },
"update" : { $set : { "status" : "Critical Injury" } }
}
},
{
deleteOne: { "filter" : { "char" : "Brisbane"} }
},
{
replaceOne: {
"filter" : { "char" : "Meldane" },
"replacement" : { "char" : "Tanys", "class" : "oracle", "lvl" : 4 }
}
}
]);
}
catch (e) { print(e); }
打印輸出:
{
"acknowledged" : true,
"deletedCount" : 1,
"insertedCount" : 2,
"matchedCount" : 2,
"upsertedCount" : 0,
"insertedIds" : {
"0" : 4,
"1" : 5
},
"upsertedIds" : {
}
}
等效的 Java 3.2 實現如下:
MongoCollection<Document> collection = db.getCollection("characters");
List<WriteModel<Document>> writes = new ArrayList<WriteModel<Document>>();
writes.add(
new InsertOneModel<Document>(
new Document("_id", 4)
.append("char", "Dithras")
.append("class", "barbarian")
.append("lvl", 3)
)
);
writes.add(
new InsertOneModel<Document>(
new Document("_id", 5)
.append("char", "Taeln")
.append("class", "fighter")
.append("lvl", 4)
)
);
writes.add(
new UpdateOneModel<Document>(
new Document("char", "Eldon"), // filter
new Document("$set", new Document("status", "Critical Injury")) // update
)
);
writes.add(new DeleteOneModel<Document>(new Document("char", "Brisbane")));
writes.add(
new ReplaceOneModel<Document>(
new Document("char", "Meldane"),
new Document("char", "Tanys")
.append("class", "oracle")
.append("lvl", 4)
)
);
BulkWriteResult bulkWriteResult = collection.bulkWrite(writes);
對於您的問題,請使用replaceOne()
方法,這將實現為
MongoCollection<Document> collection = db.getCollection("collection");
List<WriteModel<Document>> writes = Arrays.<WriteModel<Document>>asList(
new ReplaceOneModel<Document>(
new Document("_id", 1001), // filter
new Document("author", "newName"), // update
new UpdateOptions().upsert(true) // options
)
);
BulkWriteResult bulkWriteResult = collection.bulkWrite(writes);
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