Mongodb 通过 _id 更新一个文档(无效的 BSON 字段名称 _id)

/**
 * Replace a document in the collection according to the specified arguments.
 *
 * @param filter      the query filter to apply the the replace operation
 * @param replacement the replacement document
 * @return the result of the replace one operation
 * @throws com.mongodb.MongoWriteException        if the write failed due some other failure specific to the replace command
 * @throws com.mongodb.MongoWriteConcernException if the write failed due being unable to fulfil the write concern
 * @throws com.mongodb.MongoException             if the write failed due some other failure
 * @mongodb.driver.manual tutorial/modify-documents/#replace-the-document Replace
 */
UpdateResult replaceOne(Bson filter, TDocument replacement);

对你来说应该比

/**
 * Update a single document in the collection according to the specified arguments.
 *
 * @param filter a document describing the query filter, which may not be null.
 * @param update a document describing the update, which may not be null. The update to apply must include only update operators.
 * @return the result of the update one operation
 * @throws com.mongodb.MongoWriteException        if the write failed due some other failure specific to the update command
 * @throws com.mongodb.MongoWriteConcernException if the write failed due being unable to fulfil the write concern
 * @throws com.mongodb.MongoException             if the write failed due some other failure
 * @mongodb.driver.manual tutorial/modify-documents/ Updates
 * @mongodb.driver.manual reference/operator/update/ Update Operators
 */
UpdateResult updateOne(Bson filter, Bson update);

我分享文档的原因是为了引出两个重要的条款-

1. updateOne个readds-The update to apply must include only update operators，如果你像mapToMongoDocumentEntry方法那样生成一个，那么更新现有文档的_id不是一个好主意，而是用一个替换文档.
2. 由于mapToMongoDocumentEntry返回的是整个文档，而不仅仅是属性，所以您实际上需要的是整个文档替换，而不是更新它的字段.

另外，请注意，您可以使用上述两种方法，并使用额外的参数UpdateOptions重载，该参数可以提供对文档upsert、bypass等的支持.