如何使用Java在MongoDB中执行文档的批量更新
我正在使用MongoDB 3.2和MongoDB
Java驱动程序3.2。我有一个包含数百个更新文档的数组,这些文档现在应该保存/存储在MongoDB中。为了做到这一点,我遍历数组,并为该数组中的每个文档调用updateOne()
方法。
现在,我想通过批量更新重新实现此逻辑。我尝试在使用MongoDB Java驱动程序3.2的MongoDB 3.2中找到批量更新的示例。
我尝试了这段代码:
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();
但是,似乎这种方法基于过时的MongoDB Java驱动程序(例如2.4),并使用了不赞成使用的方法。
如何使用MongoDB Java Driver 3.2在MongoDB 3.2中执行文档的批量更新?
回答:
使用新 API 手册中的示例,考虑以下包含以下文档的测试集合:
{ "_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 对characters
集合执行多项操作:
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" : { $set : { "status" : "Critical Injury" } }
}
},
{
deleteOne: { "filter" : { "char" : "Brisbane"} }
},
{
replaceOne: {
"filter" : { "char" : "Meldane" },
"replacement" : { "char" : "Tanys", "class" : "oracle", "lvl" : 4 }
}
}
]);
}
catch (e) { print(e); }
打印输出:
{ "acknowledged" : true,
"deletedCount" : 1,
"insertedCount" : 2,
"matchedCount" : 2,
"upsertedCount" : 0,
"insertedIds" : {
"0" : 4,
"1" : 5
},
"upsertedIds" : {
}
}
等效的Java 3.2实现如下:
MongoCollection<Document> collection = db.getCollection("characters");List<WriteModel<Document>> writes = new ArrayList<WriteModel<Document>>();
writes.add(
new InsertOneModel<Document>(
new Document("_id", 4)
.append("char", "Dithras")
.append("class", "barbarian")
.append("lvl", 3)
)
);
writes.add(
new InsertOneModel<Document>(
new Document("_id", 5)
.append("char", "Taeln")
.append("class", "fighter")
.append("lvl", 4)
)
);
writes.add(
new UpdateOneModel<Document>(
new Document("char", "Eldon"), // filter
new Document("$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);
对于您的问题,请使用
方法,并将其实现为
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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