Query Resources by Tag

Function

This API is used by an application to query resources with specific tags. Currently, only devices can be tagged.

Debugging

You can debug this API through automatic authentication in API Explorer or use the SDK sample code generated by API Explorer.

URI

POST /v5/iot/{project_id}/tags/query-resources

**Table 1** Path Parameters
Parameter	Mandatory	Type	Description
project_id	Yes	String	Parameter description: project ID. For details about how to obtain the project ID, see Obtaining a Project ID.

**Table 2** Query Parameters
Parameter	Mandatory	Type	Description
limit	No	Integer	Parameter description: number of records to display on each page. Value: The value is an integer ranging from 1 to 50. The default value is 10.
marker	No	String	Parameter description: ID of the last record in the previous query. The value is returned by the platform during the previous query. Records are queried in descending order of record IDs (the marker value). A newer record will have a larger ID. If marker is specified, only the records whose IDs are smaller than marker are queried. If marker is not specified, the query starts from the record with the largest ID, that is, the latest record. If all data needs to be queried in sequence, this parameter must be filled with the value of marker returned in the last query response each time. Value: The value is a string of 24 hexadecimal characters. The default value is ffffffffffffffffffffffff.
offset	No	Integer	Parameter description: If offset is set to N, the query starts from the N+1 record after the last record in the previous query. If offset is set to 0, the output starts from the first record after the last record in the previous query. To ensure API performance, you can use this parameter together with marker to turn pages. For example, if there are 50 records on each page, you can directly specify offset to jump to the specified page within page 1 and 11. If you want to view records displayed on pages 12 to 22, you need to use the marker value returned on page 11 as the marker value for the next query. Value: The value is an integer ranging from 0 to 500. The default value is 0.

Request Parameters

**Table 3** Request header parameters
Parameter	Mandatory	Type	Description
X-Auth-Token	No	String	Parameter description: user token. You can obtain the token by calling the IAM API Obtaining a User Token Through Password Authentication. X-Subject-Token in the response header returned by the API is the desired user token. For details about how to obtain the token, see Token Authentication.
Instance-Id	No	String	Parameter description: instance ID. Unique identifier of each instance in the physical multi-tenant scenario. Mandatory for professional editions and recommended in other cases. Log in to the IoTDA console and choose Overview in the navigation pane to view the instance ID. For details, see Viewing Instance Details.

**Table 4** Request body parameters
Parameter	Mandatory	Type	Description
resource_type	Yes	String	Parameter description: type of resources to query. Currently, only devices are supported.
tags	Yes	Array of TagV5DTO objects	Parameter description: tag list. Specify tag key-value pairs. If multiple tags are specified, resources with any of the specified tags are returned.

**Table 5** TagV5DTO
Parameter	Mandatory	Type	Description
tag_key	Yes	String	Parameter description: tag key, which is unique for a resource. If the specified key already exists, the value of the existing tag is overwritten. If the specified key does not exist, a new tag is added. Value: The value can contain a maximum of 64 characters. Only letters, digits, underscores (_), periods (.), and hyphens (-) are allowed.
tag_value	No	String	Parameter description: tag value. Value: The value can contain a maximum of 128 characters. Only letters, digits, underscores (_), periods (.), and hyphens (-) are allowed.

Response Parameters

Status code: 200

**Table 6** Response body parameters
Parameter	Type	Description
resources	Array of ResourceDTO objects	Resource list.
page	Page object	Pagination information of the query results.

**Table 7** ResourceDTO
Parameter	Type	Description
resource_id	String	Resource ID. For example, if resource_type is set to device, set this parameter to the device ID.

**Table 8** Page
Parameter	Type	Description
count	Long	Total number of records that meet the query conditions.
marker	String	ID of the last record in this query, which can be used in the next query.

Example Requests

Queries devices bound to a specified tag.

POST https://{endpoint}/v5/iot/{project_id}/tags/query-resources

{
  "resource_type" : "device",
  "tags" : [ {
    "tag_key" : "testTagName",
    "tag_value" : "testTagValue"
  } ]
}

Example Responses

Status code: 200

{
  "resources" : [ {
    "resource_id" : "d4922d8a"
  } ],
  "page" : {
    "count" : 10,
    "marker" : "5c90fa7d3c4e4405e8525079"
  }
}

Status Codes

Status Code	Description
200	OK
400	Bad Request
403	Forbidden
404	Not Found
500	Internal Server Error

Error Codes

See Error Codes.

Parent topic: Tag Management

Previous topic: Unbind Tags

Next topic: Instance Management

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