如何根据hashkey删除Amazon Dynamodb中的记录？

Question

我想通过hashkey从aws dynamodb表中删除所有项目。我在互联网上看到很多关于它的讨论，但没有实际的代码示例，我所有的尝试都失败了。

我在这里做错了什么或者是否还有更好的应用？

List<Document> results = null; 
var client = new AmazonDynamoDBClient("myamazonkey", "myamazonsecret"); 
var table = Table.LoadTable(client, "mytable"); 

var search = table.Query(new Primitive("hashkey"), new RangeFilter()); 
do { 
results = search.GetNextSet(); 
search.Matches.Clear(); 
foreach (var r in results) 
        { 
         client.DeleteItem(new DeleteItemRequest() 
          { 
           Key = new Key() { HashKeyElement = new AttributeValue() { S = "hashkey"}, RangeKeyElement = new AttributeValue() { N = r["range-key"].AsString() } } 
          }); 
        } 
} while(results.Count > 0); 

Answer 1

使用AWS批处理写入功能解决问题。我把我的产品分成25批，但我认为这个API可能需要多达100个。

List<Document> results = null; 
var client = new AmazonDynamoDBClient("myamazonkey", "myamazonsecret"); 
var table = Table.LoadTable(client, "mytable"); 
var batchWrite = table.CreateBatchWrite(); 
var batchCount = 0; 

var search = table.Query(new Primitive("hashkey"), new RangeFilter()); 
do { 
    results = search.GetNextSet(); 
    search.Matches.Clear(); 
    foreach (var document in results) 
    { 
    batchWrite.AddItemToDelete(document); 
    batchCount++; 
    if (batchCount%25 == 0) 
    { 
     batchCount = 0; 
     try 
     { 
     batchWrite.Execute(); 
     } 
     catch (Exception exception) 
     { 
     Console.WriteLine("Encountered an Amazon Exception {0}", exception); 
     } 

     batchWrite = table.CreateBatchWrite(); 
    } 
    } 
    if (batchCount > 0) batchWrite.Execute(); 
    } 
} while(results.Count > 0);