GetColumn-阿里云帮助中心

Operation description

DataWorks Basic Edition or a higher edition is required.

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Test

RAM authorization

The table below describes the authorization required to call this API. You can define it in a Resource Access Management (RAM) policy. The table's columns are detailed below:

Action: The actions can be used in the Action element of RAM permission policy statements to grant permissions to perform the operation.
API: The API that you can call to perform the action.
Access level: The predefined level of access granted for each API. Valid values: create, list, get, update, and delete.
Resource type: The type of the resource that supports authorization to perform the action. It indicates if the action supports resource-level permission. The specified resource must be compatible with the action. Otherwise, the policy will be ineffective.
- For APIs with resource-level permissions, required resource types are marked with an asterisk (*). Specify the corresponding Alibaba Cloud Resource Name (ARN) in the Resource element of the policy.
- For APIs without resource-level permissions, it is shown as All Resources. Use an asterisk (*) in the Resource element of the policy.
Condition key: The condition keys defined by the service. The key allows for granular control, applying to either actions alone or actions associated with specific resources. In addition to service-specific condition keys, Alibaba Cloud provides a set of common condition keys applicable across all RAM-supported services.
Dependent action: The dependent actions required to run the action. To complete the action, the RAM user or the RAM role must have the permissions to perform all dependent actions.

Action

Access level

Resource type

Condition key

Dependent action

dataworks:GetColumn

get

*All Resource

*

None

Request parameters

Parameter	Type	Required	Description	Example
Id	string	Yes	The ID. You can refer to the response of the ListColumns operation and the description of concepts related to metadata entities. The format: `${EntityType}:${Instance ID or escaped URL}:${Catalog identifier}:${Database name}:${Schema name}:${Table name}:${Column name}`. Use empty strings as placeholders for levels that do not exist. Note For the MaxCompute and DLF types, use an empty string as the placeholder for the instance ID. For MaxCompute, the database name refers to the MaxCompute project name. If the project has schema enabled, you must specify the schema name. Otherwise, use an empty string as the placeholder for the schema name. Note The catalog identifier of the StarRocks is the catalog name, and the catalog identifier of the DLF type is the catalog ID. Other types do not support catalog levels. Use empty strings as placeholders. Examples of common ID formats `maxcompute-column:::project_name:[schema_name]:table_name:column_name` `dlf-column::catalog_id:database_name::table_name:column_name` `hms-column:instance_id::database_name::table_name:column_name` `holo-column:instance_id::database_name:schema_name:table_name:column_name` `mysql-column:(instance_id\|encoded_jdbc_url)::database_name::table_name:column_name` Note `instance_id`: the ID of the instance, which is required when the data source is registered in instance mode. `encoded_jdbc_url`: The URL-encoded JDBC connection string, which is required when the data source is registered via a connection string. `catalog_id`: The DLF catalog ID. `project_name`: The MaxCompute project name. `database_name`: The database name. `schema_name`: The schema name. For the MaxCompute type, this is required only if the project has enabled schema; otherwise, use an empty string as a placeholder. `table_name`: The table name. `column_name`: The field name.	maxcompute-column:::project_name:[schema_name]:table_name:column_name

Response elements

Element	Type	Description	Example
	object	The response.
RequestId	string	The request ID.	D1E2E5BC-xxxx-xxxx-xxxx-xxxxxx
Success	boolean	Indicates whether the request succeeded.	true
Column	Column	The columns in the table.

Examples

Success response

JSON format

{
  "RequestId": "D1E2E5BC-xxxx-xxxx-xxxx-xxxxxx",
  "Success": true,
  "Column": {
    "Id": "maxcompute-column:123456::test_project:default:test_tbl:col1",
    "Name": "col1",
    "Comment": "字段1",
    "TableId": "maxcompute-table:123456::test_project:default:test_tbl",
    "Position": 1,
    "Type": "bigint",
    "PrimaryKey": false,
    "PartitionKey": false,
    "ForeignKey": false,
    "BusinessMetadata": {
      "Description": "字段1的业务描述",
      "CustomAttributes": {
        "key": [
          "张三"
        ]
      }
    }
  }
}

Error codes

See Error Codes for a complete list.

Release notes

See Release Notes for a complete list.