Querying Resources by Tag

Function

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

Constraints

A maximum of 10 tags can be added to a DB instance. The tag key must be unique.

URI

URI format
POST /v3/{project_id}/instances/action

Parameter description

**Table 1** Parameter description
Name	Mandatory	Description
project_id	Yes	Specifies the project ID of a tenant in a region.

Requests

Parameter description

**Table 2** Parameter description
Name	Mandatory	Type	Description
offset	No	String	Specifies 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	No	String	Specifies 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	Yes	String	Specifies 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	No	Array of objects	Specifies 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	No	Array of objects	Specifies the included tags. Each tag contains a maximum of 10 keys. For more information, see Table 3.

**Table 3** tags field data structure description
Name	Mandatory	Type	Description
key	Yes	String	Specifies 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	Yes	Array of strings	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	Mandatory	Type	Description
key	Yes	String	Specifies 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	Yes	String	Specifies the name or ID of the DB instance to be matched.

Request header

POST https://DDS endpoint/v3/{project_id}/instances/action

Example request

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	Indicates the instance list.
total_count	Integer	Indicates the total number of queried records.

**Table 6** instance field data structure description
Name	Type	Description
instance_id	String	Indicates the DB instance ID.
instance_name	String	Indicates the DB instance name.
tags	Array of objects	Indicates 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	Indicates the tag key. The value contains 36 Unicode characters and cannot be blank. Character set: 0-9, A-Z, a-z, "_", and "-".
value	String	Indicates 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.