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# `GetAssetPropertyValue`与 Amazon SDK 或 CLI 配合使用
`GetAssetPropertyValue`

以下代码示例演示如何使用 `GetAssetPropertyValue`。

------
#### [ CLI ]

**Amazon CLI**  
**检索资产属性的当前值**  
以下 `get-asset-property-value` 示例检索风电涡轮机资产的当前总功率。  

```
aws iotsitewise get-asset-property-value \
    --asset-id a1b2c3d4-5678-90ab-cdef-33333EXAMPLE \
    --property-id a1b2c3d4-5678-90ab-cdef-66666EXAMPLE
```
输出：  

```
{
    "propertyValue": {
        "value": {
            "doubleValue": 6890.8677520453875
        },
        "timestamp": {
            "timeInSeconds": 1580853000,
            "offsetInNanos": 0
        },
        "quality": "GOOD"
    }
}
```
有关更多信息，请参阅《物*Amazon 联网 SiteWise 用户指南》*中的[查询当前资产属性值](https://docs.amazonaws.cn/iot-sitewise/latest/userguide/query-industrial-data.html#current-values)。  
+  有关 API 的详细信息，请参阅*Amazon CLI 命令参考[GetAssetPropertyValue](https://awscli.amazonaws.com/v2/documentation/api/latest/reference/iotsitewise/get-asset-property-value.html)*中的。

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

**适用于 Java 的 SDK 2.x**  
 还有更多相关信息 GitHub。在 [Amazon 代码示例存储库](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/javav2/example_code/iotsitewise#code-examples)中查找完整示例，了解如何进行设置和运行。

```
    /**
     * Fetches the value of an asset property.
     *
     * @param propId  the ID of the asset property to fetch.
     * @param assetId the ID of the asset to fetch the property value for.
     * @return a {@link CompletableFuture} that represents a {@link Double} result. The calling code can attach
     *         callbacks, then handle the result or exception by calling {@link CompletableFuture#join()} or
     *         {@link CompletableFuture#get()}.
     *         <p>
     *         If any completion stage in this method throws an exception, the method logs the exception cause and keeps
     *         it available to the calling code as a {@link CompletionException}. By calling
     *         {@link CompletionException#getCause()}, the calling code can access the original exception.
     */
    public CompletableFuture<Double> getAssetPropValueAsync(String propId, String assetId) {
        GetAssetPropertyValueRequest assetPropertyValueRequest = GetAssetPropertyValueRequest.builder()
                .propertyId(propId)
                .assetId(assetId)
                .build();

        return getAsyncClient().getAssetPropertyValue(assetPropertyValueRequest)
                .handle((response, exception) -> {
                    if (exception != null) {
                        logger.error("Error occurred while fetching property value: {}.", exception.getCause().getMessage());
                        throw (CompletionException) exception;
                    }
                    return response.propertyValue().value().doubleValue();
                });
    }
```
+  有关 API 的详细信息，请参阅 *Amazon SDK for Java 2.x API 参考[GetAssetPropertyValue](https://docs.amazonaws.cn/goto/SdkForJavaV2/iotsitewise-2019-12-02/GetAssetPropertyValue)*中的。

------
#### [ JavaScript ]

**适用于 JavaScript (v3) 的软件开发工具包**  
 还有更多相关信息 GitHub。在 [Amazon 代码示例存储库](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/javascriptv3/example_code/iotsitewise#code-examples)中查找完整示例，了解如何进行设置和运行。

```
import {
  GetAssetPropertyValueCommand,
  IoTSiteWiseClient,
} from "@aws-sdk/client-iotsitewise";
import { parseArgs } from "node:util";

/**
 * Describe an asset property value.
 * @param {{ entryId : string }}
 */
export const main = async ({ entryId }) => {
  const client = new IoTSiteWiseClient({});
  try {
    const result = await client.send(
      new GetAssetPropertyValueCommand({
        entryId: entryId, // The ID of the Gateway to describe.
      }),
    );
    console.log("Asset property information retrieved successfully.");
    return result;
  } catch (caught) {
    if (caught instanceof Error && caught.name === "ResourceNotFound") {
      console.warn(
        `${caught.message}. The asset property entry could not be found. Please check the entry id.`,
      );
    } else {
      throw caught;
    }
  }
};
```
+  有关 API 的详细信息，请参阅 *适用于 JavaScript 的 Amazon SDK API 参考[GetAssetPropertyValue](https://docs.amazonaws.cn/AWSJavaScriptSDK/v3/latest/client/iotsitewise/command/GetAssetPropertyValueCommand)*中的。

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

**适用于 Python 的 SDK（Boto3）**  
 还有更多相关信息 GitHub。在 [Amazon 代码示例存储库](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/python/example_code/iotsitewise#code-examples)中查找完整示例，了解如何进行设置和运行。

```
class IoTSitewiseWrapper:
    """Encapsulates AWS IoT SiteWise actions using the client interface."""

    def __init__(self, iotsitewise_client: client) -> None:
        """
        Initializes the IoTSitewiseWrapper with an AWS IoT SiteWise client.

        :param iotsitewise_client: A Boto3 AWS IoT SiteWise client. This client provides low-level
                           access to AWS IoT SiteWise services.
        """
        self.iotsitewise_client = iotsitewise_client
        self.entry_id = 0 # Incremented to generate unique entry IDs for batch_put_asset_property_value.

    @classmethod
    def from_client(cls) -> "IoTSitewiseWrapper":
        """
        Creates an IoTSitewiseWrapper instance with a default AWS IoT SiteWise client.

        :return: An instance of IoTSitewiseWrapper initialized with the default AWS IoT SiteWise client.
        """
        iotsitewise_client = boto3.client("iotsitewise")
        return cls(iotsitewise_client)


    def get_asset_property_value(
        self, asset_id: str, property_id: str
    ) -> Dict[str, Any]:
        """
        Gets the value of an AWS IoT SiteWise Asset Property.

        :param asset_id: The ID of the asset.
        :param property_id: The ID of the property.
        :return: A dictionary containing the value of the property.
        """
        try:
            response = self.iotsitewise_client.get_asset_property_value(
                assetId=asset_id, propertyId=property_id
            )
            return response["propertyValue"]
        except ClientError as err:
            if err.response["Error"]["Code"] == "ResourceNotFoundException":
                logger.error(
                    "Asset %s or property %s does not exist.", asset_id, property_id
                )
            else:
                logger.error(
                    "Error getting asset property value. Here's why %s",
                    err.response["Error"]["Message"],
                )
            raise
```
+  有关 API 的详细信息，请参阅适用[GetAssetPropertyValue](https://docs.amazonaws.cn/goto/boto3/iotsitewise-2019-12-02/GetAssetPropertyValue)于 *Python 的Amazon SDK (Boto3) API 参考*。

------
#### [ SAP ABAP ]

**适用于 SAP ABAP 的 SDK**  
 还有更多相关信息 GitHub。在 [Amazon 代码示例存储库](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/sap-abap/services/ios#code-examples)中查找完整示例，了解如何进行设置和运行。

```
    TRY.
        oo_result = lo_ios->getassetpropertyvalue(
          iv_assetid = iv_asset_id
          iv_propertyid = iv_property_id
        ). " oo_result is returned for testing purposes. "
        MESSAGE 'Retrieved asset property value.' TYPE 'I'.
      CATCH /aws1/cx_iosresourcenotfoundex.
        MESSAGE 'Asset or property does not exist.' TYPE 'E'.
    ENDTRY.
```
+  有关 API 的详细信息，请参阅适用[GetAssetPropertyValue](https://docs.amazonaws.cn/sdk-for-sap-abap/v1/api/latest/index.html)于 S *AP 的Amazon SDK ABAP API 参考*。

------

有关 S Amazon DK 开发者指南和代码示例的完整列表，请参阅[将此服务与 Amazon SDK 配合使用](sdk-general-information-section.md)。本主题还包括有关入门的信息以及有关先前的 SDK 版本的详细信息。