如需與 Amazon Timestream for LiveAnalytics 類似的功能，請考慮使用 Amazon Timestream for InfluxDB。它提供簡化的資料擷取和單一位數毫秒查詢回應時間，以進行即時分析。[在這裡](https://docs.aws.amazon.com//timestream/latest/developerguide/timestream-for-influxdb.html)進一步了解。

本文為英文版的機器翻譯版本，如內容有任何歧義或不一致之處，概以英文版為準。

# 取消查詢
<a name="code-samples.cancel-query"></a>

您可以使用下列程式碼片段來取消查詢。

**注意**  
這些程式碼片段是以 [GitHub](https://github.com/awslabs/amazon-timestream-tools/blob/master/sample_apps) 上的完整範例應用程式為基礎。如需如何開始使用範例應用程式的詳細資訊，請參閱[範例應用程式](sample-apps.md)。

------
#### [  Java  ]

```
    public void cancelQuery() {
        System.out.println("Starting query: " + SELECT_ALL_QUERY);
        QueryRequest queryRequest = new QueryRequest();
        queryRequest.setQueryString(SELECT_ALL_QUERY);
        QueryResult queryResult = queryClient.query(queryRequest);
 
        System.out.println("Cancelling the query: " + SELECT_ALL_QUERY);
        final CancelQueryRequest cancelQueryRequest = new CancelQueryRequest();
        cancelQueryRequest.setQueryId(queryResult.getQueryId());
        try {
            queryClient.cancelQuery(cancelQueryRequest);
            System.out.println("Query has been successfully cancelled");
        } catch (Exception e) {
            System.out.println("Could not cancel the query: " + SELECT_ALL_QUERY + " = " + e);
        }
    }
```

------
#### [  Java v2  ]

```
    public void cancelQuery() {
        System.out.println("Starting query: " + SELECT_ALL_QUERY);
        QueryRequest queryRequest = QueryRequest.builder().queryString(SELECT_ALL_QUERY).build();
        QueryResponse queryResponse = timestreamQueryClient.query(queryRequest);

        System.out.println("Cancelling the query: " + SELECT_ALL_QUERY);
        final CancelQueryRequest cancelQueryRequest = CancelQueryRequest.builder()
                .queryId(queryResponse.queryId()).build();
        try {
            timestreamQueryClient.cancelQuery(cancelQueryRequest);
            System.out.println("Query has been successfully cancelled");
        } catch (Exception e) {
            System.out.println("Could not cancel the query: " + SELECT_ALL_QUERY + " = " + e);
        }
    }
```

------
#### [  Go  ]

```
cancelQueryInput := &timestreamquery.CancelQueryInput{
      QueryId: aws.String(*queryOutput.QueryId),
  }

  fmt.Println("Submitting cancellation for the query")
  fmt.Println(cancelQueryInput)

  // submit the query
  cancelQueryOutput, err := querySvc.CancelQuery(cancelQueryInput)

  if err != nil {
      fmt.Println("Error:")
      fmt.Println(err)
  } else {
    fmt.Println("Query has been cancelled successfully")
    fmt.Println(cancelQueryOutput)
  }
```

------
#### [  Python  ]

```
    def cancel_query(self):
        print("Starting query: " + self.SELECT_ALL)
        result = self.client.query(QueryString=self.SELECT_ALL)
        print("Cancelling query: " + self.SELECT_ALL)
        try:
            self.client.cancel_query(QueryId=result['QueryId'])
            print("Query has been successfully cancelled")
        except Exception as err:
            print("Cancelling query failed:", err)
```

------
#### [  Node.js  ]

下列程式碼片段使用適用於 JavaScript V2 樣式的 AWS SDK。它以 [Node.js 範例應用程式為基礎，Amazon Timestream for LiveAnalytics 應用程式為 GitHub](https://github.com/awslabs/amazon-timestream-tools/tree/mainline/sample_apps/js)。

```
async function tryCancelQuery() { 
    const params = { 
        QueryString: SELECT_ALL_QUERY 
    }; 
    console.log(`Running query: ${SELECT_ALL_QUERY}`); 
  
    await queryClient.query(params).promise() 
        .then( 
            async (response) => { 
                await cancelQuery(response.QueryId); 
            }, 
            (err) => { 
                console.error("Error while executing select all query:", err); 
            }); 
} 
  
async function cancelQuery(queryId) { 
    const cancelParams = { 
        QueryId: queryId 
    }; 
    console.log(`Sending cancellation for query: ${SELECT_ALL_QUERY}`); 
    await queryClient.cancelQuery(cancelParams).promise() 
        .then( 
            (response) => { 
                console.log("Query has been cancelled successfully"); 
            }, 
            (err) => { 
                console.error("Error while cancelling select all:", err); 
            }); 
}
```

------
#### [  .NET  ]

```
        public async Task CancelQuery()
        {
            Console.WriteLine("Starting query: " + SELECT_ALL_QUERY);
            QueryRequest queryRequest = new QueryRequest();
            queryRequest.QueryString = SELECT_ALL_QUERY;
            QueryResponse queryResponse = await queryClient.QueryAsync(queryRequest);

            Console.WriteLine("Cancelling query: " + SELECT_ALL_QUERY);
            CancelQueryRequest cancelQueryRequest = new CancelQueryRequest();
            cancelQueryRequest.QueryId = queryResponse.QueryId;

            try
            {
                await queryClient.CancelQueryAsync(cancelQueryRequest);
                Console.WriteLine("Query has been successfully cancelled.");
            } catch(Exception e)
            {
                Console.WriteLine("Could not cancel the query: " + SELECT_ALL_QUERY + " = " + e);
            }
        }
```

------