Querying Resources by Tag

Description

This API is used to query the specified DB instances by tag.

Restrictions

A maximum of 20 tags can be added to a DB instance. The tag key must be unique.

URI

• URI format

  POST https://{Endpoint}/v3/{project_id}/instances/action

• URI example

  https://dds.ap-southeast-1.myhuaweicloud.com/v3/0549b4a43100d4f32f51c01c2fe4acdb/instances/action

Requests

• Parameter description

  Table 2 Parameter description

  Name	Type	Mandatory	Description
  offset	String	No	The index position. The query starts from the next piece of data indexed by this parameter. If action is set to count, this parameter is not transferred. If action is set to filter, this parameter must be a positive integer. The default value is 0, indicating that the query starts from the first piece of data.
  limit	String	No	The number of resources to be queried. If action is set to count, this parameter is not transferred. If action is set to filter, the value range is from 1 to 100. If this parameter is not transferred, the first 100 DB instances are queried by default.
  action	String	Yes	The operation identifier. If action is set to filter, instances are queried by tag filtering criteria. If action is set to count, only the total number of records is returned.
  matches	Array of objects	No	The search field. If the value is left blank, the query is not based on the instance name or instance ID. If the value is not empty, see Table 4.
  tags	Array of objects	No	The included tags. Each tag contains a maximum of 20 keys. For more information, see Table 3.

  Table 3 tags field data structure description

  Name	Type	Mandatory	Description
  key	String	Yes	The tag key. It contains a maximum of 36 Unicode characters. key cannot be empty, an empty string, or spaces. Before using key, delete spaces of single-byte character (SBC) before and after the value. NOTE: The character set of this parameter is not verified in the search process.
  values	Array of strings	Yes	Lists the tag values. Each value contains a maximum of 43 Unicode characters and cannot contain spaces. Before using values, delete SBC spaces before and after the value. If the values are null, it indicates querying any value. The values are in OR relationship.

  Table 4 matches field description

  Name	Type	Mandatory	Description
  key	String	Yes	The query criteria. The value can be instance_name or instance_id, indicating that the query is based on the instance name or instance ID.
  value	String	Yes	The name or ID of the DB instance to be matched. You can call the API for querying DB instances to obtain the DB instance name or ID. If you do not have an instance, you can call the API used for creating an instance.

• Request example

  Query specified DB instances by tag.

  {
    "offset": "100",
    "limit": "100",
    "action": "filter",
    "matches": [
      {
        "key": "instance_name",
        "value": "test-single"
      }
    ],
    "tags": [
      {
        "key": "key1",
        "values": [
          "value1",
          "value2"
        ]
      }
    ]
  }

  Query the total number of resources.

  {
    "action": "count",
    "tags": [
      {
        "key": "key1",
        "values": [
          "value1",
          "value2"
        ]
      },
      {
        "key": "key2",
        "values": [
          "value1",
          "value2"
        ]
      }
    ],
    "matches": [
      {
        "key": "instance_name",
        "value": "test-single"
      },
       {
        "key": "instance_id",
        "value": "958693039f284d6ebfb177375711072ein02"
      }
    ]
  }

Responses

• Parameter description

  Table 5 Parameter description

  Name	Type	Description
  instances	Array of objects	The instance list. For details, see Table 6.
  total_count	Integer	The total number of queried records.

  Table 6 instance field data structure description

  Name	Type	Description
  instance_id	String	The instance ID, which can be obtained by calling the API for querying instances. If you do not have an instance, you can call the API used for creating an instance.
  instance_name	String	The DB instance name.
  tags	Array of objects	The tag list. If there is no tag in the list, tags is taken as an empty array. For more information, see Table 7.

  Table 7 tags field data structure description

  Name	Type	Description
  key	String	The tag key. The value contains 36 Unicode characters and cannot be blank. Character set: 0-9, A-Z, a-z, "_", and "-".
  value	String	The tag value. The value contains a maximum of 43 Unicode characters and can also be an empty string. Character set: 0-9, A-Z, a-z, "_", "." and "-".

• Response example

  Return specified DB instances by tag.

  {
    "instances": [
      {
        "instance_id": "2acbf2223caf3bac3c33c6153423c3ccin02",
        "instance_name": "test-single",
        "tags": [
          {
            "key": "key1",
            "value": "value1"
          },
          {
            "key": "key2",
            "value": "value1"
          }
        ]
      }
    ]
  }

  Number of returned records.

  {
    "total_count": 4
  }

Status Code

For more information, see Status Code.

Error Code

For more information, see Error Code.