IoTDB Website

July 10, 2023About 6 min

IoTDB's RESTful services can be used for query, write, and management operations, using the OpenAPI standard to define interfaces and generate frameworks.

Enable RESTful Services

RESTful services are disabled by default.

Developer
Find the IoTDBrestServiceConfig class under org.apache.iotdb.db.conf.rest in the sever module, and modify enableRestService=true.
User
Find the conf/iotdb.rest.properties file under the IoTDB installation directory and set enable_rest_service to true to enable the module.
```
enable_rest_service=true
```

Authentication

Except the liveness probe API /ping, RESTful services use the basic authentication. Each URL request needs to carry 'Authorization': 'Basic ' + base64.encode(username + ':' + password).

The username used in the following examples is: root, and password is: root.

And the authorization header is

Authorization: Basic cm9vdDpyb290

If a user authorized with incorrect username or password, the following error is returned:
HTTP Status Code：401
HTTP response body:
```
{
  "code": 600,
  "message": "WRONG_LOGIN_PASSWORD_ERROR"
}
```
If the Authorization header is missing，the following error is returned:
HTTP Status Code：401
HTTP response body:
```
{
  "code": 603,
  "message": "UNINITIALIZED_AUTH_ERROR"
}
```

Interface

ping

The /ping API can be used for service liveness probing.

Request method: GET

Request path: http://ip:port/ping

The user name used in the example is: root, password: root

Example request:

$ curl http://127.0.0.1:18080/ping

Response status codes:

200: The service is alive.
503: The service cannot accept any requests now.

Response parameters:

parameter name	parameter type	parameter describe
code	integer	status code
message	string	message

Sample response:

With HTTP status code 200:

{
  "code": 200,
  "message": "SUCCESS_STATUS"
}

With HTTP status code 503:

{
  "code": 500,
  "message": "thrift service is unavailable"
}

/ping can be accessed without authorization.

query

The query interface can be used to handle data queries and metadata queries.

Request method: POST

Request header: application/json

Request path: http://ip:port/rest/v1/query

Parameter Description:

parameter name	parameter type	required	parameter description
sql	string	yes
rowLimit	integer	no	The maximum number of rows in the result set that can be returned by a query. If this parameter is not set, the `rest_query_default_row_size_limit` of the configuration file will be used as the default value. When the number of rows in the returned result set exceeds the limit, the status code `411` will be returned.

Response parameters:

parameter name	parameter type	parameter description
expressions	array	Array of result set column names for data query, `null` for metadata query
columnNames	array	Array of column names for metadata query result set, `null` for data query
timestamps	array	Timestamp column, `null` for metadata query
values	array	A two-dimensional array, the first dimension has the same length as the result set column name array, and the second dimension array represents a column of the result set

Examples:

Tip: Statements like select * from root.xx.** are not recommended because those statements may cause OOM.

Expression query

curl -H "Content-Type:application/json" -H "Authorization:Basic cm9vdDpyb290" -X POST --data '{"sql":"select s3, s4, s3 + 1 from root.sg27 limit 2"}' http://127.0.0.1:18080/rest/v1/query

{
  "expressions": [
    "root.sg27.s3",
    "root.sg27.s4",
    "root.sg27.s3 + 1"
  ],
  "columnNames": null,
  "timestamps": [
    1635232143960,
    1635232153960
  ],
  "values": [
    [
      11,
      null
    ],
    [
      false,
      true
    ],
    [
      12.0,
      null
    ]
  ]
}

Show child paths

curl -H "Content-Type:application/json" -H "Authorization:Basic cm9vdDpyb290" -X POST --data '{"sql":"show child paths root"}' http://127.0.0.1:18080/rest/v1/query

{
  "expressions": null,
  "columnNames": [
    "child paths"
  ],
  "timestamps": null,
  "values": [
    [
      "root.sg27",
      "root.sg28"
    ]
  ]
}

Show child nodes

curl -H "Content-Type:application/json" -H "Authorization:Basic cm9vdDpyb290" -X POST --data '{"sql":"show child nodes root"}' http://127.0.0.1:18080/rest/v1/query

{
  "expressions": null,
  "columnNames": [
    "child nodes"
  ],
  "timestamps": null,
  "values": [
    [
      "sg27",
      "sg28"
    ]
  ]
}

Show all ttl

curl -H "Content-Type:application/json" -H "Authorization:Basic cm9vdDpyb290" -X POST --data '{"sql":"show all ttl"}' http://127.0.0.1:18080/rest/v1/query

{
  "expressions": null,
  "columnNames": [
    "database",
    "ttl"
  ],
  "timestamps": null,
  "values": [
    [
      "root.sg27",
      "root.sg28"
    ],
    [
      null,
      null
    ]
  ]
}

Show ttl

curl -H "Content-Type:application/json" -H "Authorization:Basic cm9vdDpyb290" -X POST --data '{"sql":"show ttl on root.sg27"}' http://127.0.0.1:18080/rest/v1/query

{
  "expressions": null,
  "columnNames": [
    "database",
    "ttl"
  ],
  "timestamps": null,
  "values": [
    [
      "root.sg27"
    ],
    [
      null
    ]
  ]
}

Show functions

curl -H "Content-Type:application/json" -H "Authorization:Basic cm9vdDpyb290" -X POST --data '{"sql":"show functions"}' http://127.0.0.1:18080/rest/v1/query

{
  "expressions": null,
  "columnNames": [
    "function name",
    "function type",
    "class name (UDF)"
  ],
  "timestamps": null,
  "values": [
    [
      "ABS",
      "ACOS",
      "ASIN",
       ...
    ],
    [
      "built-in UDTF",
      "built-in UDTF",
      "built-in UDTF",
      ...
    ],
    [
      "org.apache.iotdb.db.query.udf.builtin.UDTFAbs",
      "org.apache.iotdb.db.query.udf.builtin.UDTFAcos",
      "org.apache.iotdb.db.query.udf.builtin.UDTFAsin",
      ...
    ]
  ]
}

Show timeseries

curl -H "Content-Type:application/json" -H "Authorization:Basic cm9vdDpyb290" -X POST --data '{"sql":"show timeseries"}' http://127.0.0.1:18080/rest/v1/query

{
  "expressions": null,
  "columnNames": [
    "timeseries",
    "alias",
    "database",
    "dataType",
    "encoding",
    "compression",
    "tags",
    "attributes"
  ],
  "timestamps": null,
  "values": [
    [
      "root.sg27.s3",
      "root.sg27.s4",
      "root.sg28.s3",
      "root.sg28.s4"
    ],
    [
      null,
      null,
      null,
      null
    ],
    [
      "root.sg27",
      "root.sg27",
      "root.sg28",
      "root.sg28"
    ],
    [
      "INT32",
      "BOOLEAN",
      "INT32",
      "BOOLEAN"
    ],
    [
      "RLE",
      "RLE",
      "RLE",
      "RLE"
    ],
    [
      "SNAPPY",
      "SNAPPY",
      "SNAPPY",
      "SNAPPY"
    ],
    [
      null,
      null,
      null,
      null
    ],
    [
      null,
      null,
      null,
      null
    ]
  ]
}

Show latest timeseries

curl -H "Content-Type:application/json" -H "Authorization:Basic cm9vdDpyb290" -X POST --data '{"sql":"show latest timeseries"}' http://127.0.0.1:18080/rest/v1/query

{
  "expressions": null,
  "columnNames": [
    "timeseries",
    "alias",
    "database",
    "dataType",
    "encoding",
    "compression",
    "tags",
    "attributes"
  ],
  "timestamps": null,
  "values": [
    [
      "root.sg28.s4",
      "root.sg27.s4",
      "root.sg28.s3",
      "root.sg27.s3"
    ],
    [
      null,
      null,
      null,
      null
    ],
    [
      "root.sg28",
      "root.sg27",
      "root.sg28",
      "root.sg27"
    ],
    [
      "BOOLEAN",
      "BOOLEAN",
      "INT32",
      "INT32"
    ],
    [
      "RLE",
      "RLE",
      "RLE",
      "RLE"
    ],
    [
      "SNAPPY",
      "SNAPPY",
      "SNAPPY",
      "SNAPPY"
    ],
    [
      null,
      null,
      null,
      null
    ],
    [
      null,
      null,
      null,
      null
    ]
  ]
}

Count timeseries

curl -H "Content-Type:application/json" -H "Authorization:Basic cm9vdDpyb290" -X POST --data '{"sql":"count timeseries root.**"}' http://127.0.0.1:18080/rest/v1/query

{
  "expressions": null,
  "columnNames": [
    "count"
  ],
  "timestamps": null,
  "values": [
    [
      4
    ]
  ]
}

Count nodes

curl -H "Content-Type:application/json" -H "Authorization:Basic cm9vdDpyb290" -X POST --data '{"sql":"count nodes root.** level=2"}' http://127.0.0.1:18080/rest/v1/query

{
  "expressions": null,
  "columnNames": [
    "count"
  ],
  "timestamps": null,
  "values": [
    [
      4
    ]
  ]
}

Show devices

curl -H "Content-Type:application/json" -H "Authorization:Basic cm9vdDpyb290" -X POST --data '{"sql":"show devices"}' http://127.0.0.1:18080/rest/v1/query

{
  "expressions": null,
  "columnNames": [
    "devices",
    "isAligned"
  ],
  "timestamps": null,
  "values": [
    [
      "root.sg27",
      "root.sg28"
    ],
    [
      "false",
      "false"
    ]
  ]
}

Show devices with database

curl -H "Content-Type:application/json" -H "Authorization:Basic cm9vdDpyb290" -X POST --data '{"sql":"show devices with database"}' http://127.0.0.1:18080/rest/v1/query

{
  "expressions": null,
  "columnNames": [
    "devices",
    "database",
    "isAligned"
  ],
  "timestamps": null,
  "values": [
    [
      "root.sg27",
      "root.sg28"
    ],
    [
      "root.sg27",
      "root.sg28"
    ],
    [
      "false",
      "false"
    ]
  ]
}

List user

curl -H "Content-Type:application/json" -H "Authorization:Basic cm9vdDpyb290" -X POST --data '{"sql":"list user"}' http://127.0.0.1:18080/rest/v1/query

{
  "expressions": null,
  "columnNames": [
    "user"
  ],
  "timestamps": null,
  "values": [
    [
      "root"
    ]
  ]
}

Aggregation

curl -H "Content-Type:application/json" -H "Authorization:Basic cm9vdDpyb290" -X POST --data '{"sql":"select count(*) from root.sg27"}' http://127.0.0.1:18080/rest/v1/query

{
  "expressions": [
    "count(root.sg27.s3)",
    "count(root.sg27.s4)"
  ],
  "columnNames": null,
  "timestamps": [
    0
  ],
  "values": [
    [
      1
    ],
    [
      2
    ]
  ]
}

Group by level

curl -H "Content-Type:application/json" -H "Authorization:Basic cm9vdDpyb290" -X POST --data '{"sql":"select count(*) from root.** group by level = 1"}' http://127.0.0.1:18080/rest/v1/query

{
  "expressions": null,
  "columnNames": [
    "count(root.sg27.*)",
    "count(root.sg28.*)"
  ],
  "timestamps": null,
  "values": [
    [
      3
    ],
    [
      3
    ]
  ]
}

Group by

curl -H "Content-Type:application/json" -H "Authorization:Basic cm9vdDpyb290" -X POST --data '{"sql":"select count(*) from root.sg27 group by([1635232143960,1635232153960),1s)"}' http://127.0.0.1:18080/rest/v1/query

{
  "expressions": [
    "count(root.sg27.s3)",
    "count(root.sg27.s4)"
  ],
  "columnNames": null,
  "timestamps": [
    1635232143960,
    1635232144960,
    1635232145960,
    1635232146960,
    1635232147960,
    1635232148960,
    1635232149960,
    1635232150960,
    1635232151960,
    1635232152960
  ],
  "values": [
    [
      1,
      0,
      0,
      0,
      0,
      0,
      0,
      0,
      0,
      0
    ],
    [
      1,
      0,
      0,
      0,
      0,
      0,
      0,
      0,
      0,
      0
    ]
  ]
}

Last

curl -H "Content-Type:application/json"  -H "Authorization:Basic cm9vdDpyb290" -X POST --data '{"sql":"select last s3 from root.sg27"}' http://127.0.0.1:18080/rest/v1/query

{
  "expressions": null,
  "columnNames": [
    "timeseries",
    "value",
    "dataType"
  ],
  "timestamps": [
    1635232143960
  ],
  "values": [
    [
      "root.sg27.s3"
    ],
    [
      "11"
    ],
    [
      "INT32"
    ]
  ]
}

Disable align

curl -H "Content-Type:application/json" -H "Authorization:Basic cm9vdDpyb290" -X POST --data '{"sql":"select * from root.sg27 disable align"}' http://127.0.0.1:18080/rest/v1/query

{
  "code": 407,
  "message": "disable align clauses are not supported."
}

Align by device

curl -H "Content-Type:application/json" -H "Authorization:Basic cm9vdDpyb290" -X POST --data '{"sql":"select count(s3) from root.sg27 align by device"}' http://127.0.0.1:18080/rest/v1/query

{
  "code": 407,
  "message": "align by device clauses are not supported."
}

Select into

curl -H "Content-Type:application/json" -H "Authorization:Basic cm9vdDpyb290" -X POST --data '{"sql":"select s3, s4 into root.sg29.s1, root.sg29.s2 from root.sg27"}' http://127.0.0.1:18080/rest/v1/query

{
  "code": 407,
  "message": "select into clauses are not supported."
}

nonQuery

Request method: POST

Request header: application/json

Request path: http://ip:port/rest/v1/nonQuery

Parameter Description:

parameter name	parameter type	parameter describe
sql	string	query content

Example request:

curl -H "Content-Type:application/json" -H "Authorization:Basic cm9vdDpyb290" -X POST --data '{"sql":"CREATE DATABASE root.ln"}' http://127.0.0.1:18080/rest/v1/nonQuery

Response parameters:

parameter name	parameter type	parameter describe
code	integer	status code
message	string	message

Sample response:

{
  "code": 200,
  "message": "SUCCESS_STATUS"
}

insertTablet

Request method: POST

Request header: application/json

Request path: http://ip:port/rest/v1/insertTablet

Parameter Description:

parameter name	parameter type	is required	parameter describe
timestamps	array	yes	Time column
measurements	array	yes	The name of the measuring point
dataTypes	array	yes	The data type
values	array	yes	Value columns, the values in each column can be `null`
isAligned	boolean	yes	Whether to align the timeseries
deviceId	string	yes	Device name

Example request:

curl -H "Content-Type:application/json" -H "Authorization:Basic cm9vdDpyb290" -X POST --data '{"timestamps":[1635232143960,1635232153960],"measurements":["s3","s4"],"dataTypes":["INT32","BOOLEAN"],"values":[[11,null],[false,true]],"isAligned":false,"deviceId":"root.sg27"}' http://127.0.0.1:18080/rest/v1/insertTablet

Sample response:

parameter name	parameter type	parameter describe
code	integer	status code
message	string	message

Sample response:

{
  "code": 200,
  "message": "SUCCESS_STATUS"
}

Configuration

The configuration is located in 'iotdb-rest.properties'.

Set 'enable_rest_service' to 'true' to enable the module, and 'false' to disable the module. By default, this value is' false '.

enable_rest_service=true

This parameter is valid only when 'enable_REST_service =true'. Set 'rest_service_port' to a number (1025 to 65535) to customize the REST service socket port. By default, the value is 18080.

rest_service_port=18080

Set 'enable_swagger' to 'true' to display rest service interface information through swagger, and 'false' to do not display the rest service interface information through the swagger. By default, this value is' false '.

enable_swagger=false

The maximum number of rows in the result set that can be returned by a query. When the number of rows in the returned result set exceeds the limit, the status code 411 is returned.

rest_query_default_row_size_limit=10000

Expiration time for caching customer login information (used to speed up user authentication, in seconds, 8 hours by default)

cache_expire=28800

Maximum number of users stored in the cache (default: 100)

cache_max_num=100

Initial cache size (default: 10)

cache_init_num=10

REST Service whether to enable SSL configuration, set 'enable_https' to' true 'to enable the module, and set' false 'to disable the module. By default, this value is' false '.

enable_https=false

keyStore location path (optional)

key_store_path=

keyStore password (optional)

key_store_pwd=

trustStore location path (optional)

trust_store_path=

trustStore password (optional)

trust_store_pwd=

SSL timeout period, in seconds

idle_timeout=5000