如果可用，在cloudant中更新文档的最佳方法是什么，或者使用Java cloudant API插入文档

Question

参考blog我可以批量上传文件。我的问题是很少有文件已经存在于cloudant中。所以建议的方法是失败的。如果文档不存在于cloudant中，请建议如何处理批量添加，否则如果docuemnts存在则更新bluk update。

Answer 1

以下代码对我有用：

 public void upsert(List<JsonObject> bulkData,String dbName)
{
    if (bulkData == null) {
        return;
    }

    if(bulkData.isEmpty()){
        return;
    }
    if(null==dbName || dbName.length() <1){
        return;
    }

    int totalDocumentsToSave = 0;
    int totalDocumentToInsert = 0;
    int totalDocumentToUpdate = 0;
    int totalUpdatesFailed=0;
    int totalInsertsFailed =0;

    totalDocumentsToSave = bulkData.size();


    Database db = client.database(dbName, false);

        try {
            for (JsonObject aDoc : bulkData) {
                 if (aDoc.get("_id") != null) {
                     String _id= aDoc.get("_id").getAsString();

                     if(db.contains(_id))
                     {
                         try
                         {
                             Map<String, String>    aDocOnCloudant = db.getAllDocsRequestBuilder()
                                       .keys(_id)
                                       .includeDocs(true)
                                       .build()
                                       .getResponse()
                                       .getIdsAndRevs();

                                String _revId = aDocOnCloudant.get(_id);
                                aDoc.addProperty("_rev", _revId);
                                db.update(aDoc);
                                totalDocumentToUpdate++;
                         }
                         catch(Exception e)
                         {
                            totalUpdatesFailed++; 
                         }

                     }
                     else
                     {
                         try
                         {
                         db.save(aDoc);
                         totalDocumentsToSave++;
                         }
                         catch(Exception e)
                         {
                             totalInsertsFailed++;
                         }
                     }
                 }
            }

            db.ensureFullCommit();

}
        catch(Exception e){

        }

        String log = " .Number of Documents to Save: " + totalDocumentsToSave +
                     " .Number of Documents inserted: " + totalDocumentToInsert +
                     " .Number of Documents to Updated: " + totalDocumentToUpdate +
                     " .Failed Inserts: " + totalInsertsFailed +
                     " .Failed Updates: " + totalUpdatesFailed +
                     " .Cloudant full commit completed";
        System.out.println(log);

}