使用 MongoDB Java 3.0 驱动程序批量更新

Question

在 MongoDB Java 驱动程序的早期版本中，运行查询并对结果进行无序批量更新插入，我们所做的只是：

BulkWriteOperation bulk = dbCollection.initializeUnorderedBulkOperation();
    bulk.find(searchQuery).upsert().update(new BasicDBObject("$set", getDbObjectModel()));

但是在第 3 版中，引入了 Bson 文档支持和 MongoCollection.bulkWrite() 方法，如何做到这一点？

我试过了：

List<WriteModel<Document>> documentList = new ArrayList<>();

collection.bulkWrite(documentList, new BulkWriteOptions().ordered(false));

但是，我需要更新插入功能。

谢谢。

Answer 1

您仍然可以使用所有功能，只是 BulkWrites 现在具有不同的语法：

    MongoCollection<Document> collection = db.getCollection("sample");

    List<WriteModel<Document>> updates = Arrays.<WriteModel<Document>>asList(
        new UpdateOneModel<Document>(
                new Document(),                   // find part
                new Document("$set",1),           // update part
                new UpdateOptions().upsert(true)  // options like upsert
        )
    );

    BulkWriteResult bulkWriteResult = collection.bulkWrite(updates);

因此您使用 UpdateOneModel ( or for many if you want ) and set the UpdateOptions 作为构造函数的第三个参数。

需要一些时间来适应，但它基本上只是使用与其他地方相同的语法构建 "Lists"。我想这是改变的主要原因。

Answer 2

如果你想要一些东西 findAndModifyElseCreate(); 这意味着如果文档存在则更新它，否则创建它并插入数据然后请按照此操作。

BasicDBObject insertInCaseDocumentNotFound = new BasicDBObject();


insertInCaseDocumentNotFound.put("field1", "value1");
insertInCaseDocumentNotFound.put("date", new Date());


MongoCollection<BasicDBObject> table = db.getCollection("collectionName",BasicDBObject.class);

BasicDBObject updateObject = new BasicDBObject();

updateObject.append("$setOnInsert", new BasicDBObject());
updateObject.append("$set", new BasicDBObject("date",new Date());

List<WriteModel<BasicDBObject>> updates = Arrays.<WriteModel<BasicDBObject>> asList(
                new UpdateOneModel<BasicDBObject>(new BasicDBObject("search_name", alert.getString("search_name")), // query for which we need to apply

                        updateObject, // update the document in case it is found
                        new UpdateOptions().upsert(true) // upsert to insert new data in case document is not found
        ));
table.bulkWrite(updates);

Answer 3

这是使用最新 API 的示例..

for (Long entityId : entityIDs) {

    //Finder doc
    Document filterDocument = new Document();
    filterDocument.append("_id", entityId);

    //Update doc
    Document updateDocument = new Document();
    Document setDocument = new Document();
    setDocument.append("name", "xyz");
    setDocument.append("role", "abc");

    updateDocument.append("$set", setDocument);

    //Update option
    UpdateOptions updateOptions = new UpdateOptions();
    updateOptions.upsert(true); //if true, will create a new doc in case of unmatched find
    updateOptions.bypassDocumentValidation(true); //set true/false

    //Prepare list of Updates
    updateDocuments.add(
            new UpdateOneModel<Document>(
                    filterDocument,
                    updateDocument,
                    updateOptions));

}

//Bulk write options
BulkWriteOptions bulkWriteOptions = new BulkWriteOptions();
bulkWriteOptions.ordered(false);
bulkWriteOptions.bypassDocumentValidation(true);

MongoCollection<Document> mongoCollection = mongoDB.getCollection("myCollection");

BulkWriteResult bulkWriteResult = null;
try {
    //Perform bulk update
    bulkWriteResult = mongoCollection.bulkWrite(updateDocuments,
            bulkWriteOptions);
} catch (BulkWriteException e) {
    //Handle bulkwrite exception
    List<BulkWriteError> bulkWriteErrors = e.getWriteErrors();
    for (BulkWriteError bulkWriteError : bulkWriteErrors) {
        int failedIndex = bulkWriteError.getIndex();
        Long failedEntityId = entityIDs.get(failedIndex);
        System.out.println("Failed record: " + failedEntityId);
        //handle rollback
    }
}

int rowsUpdated = bulkWriteResult.getModifiedCount();

详细信息位于：https://ashutosh-srivastav-mongodb.blogspot.in/2017/09/mongodb-bulkwrite-java-api.html

使用 MongoDB Java 3.0 驱动程序批量更新

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