Query Query

yaml
type: "io.kestra.plugin.jdbc.duckdb.Query"

Query a local DuckDb.

Examples

Execute a query that reads a csv, and outputs another csv.

yaml
id: query-duckdb
namespace: dev
tasks:
  - id: http_download
    type: io.kestra.plugin.fs.http.Download
    uri: "https://raw.githubusercontent.com/kestra-io/datasets/main/csv/orders.csv"
  - id: query
    type: io.kestra.plugin.jdbc.duckdb.Query
    url: 'jdbc:duckdb:'
    timeZoneId: Europe/Paris
    sql: |-
      CREATE TABLE new_tbl AS SELECT * FROM read_csv_auto('{{ workingDir }}/in.csv', header=True);

      COPY (SELECT order_id, customer_name FROM new_tbl) TO '{{ outputFiles.out }}' (HEADER, DELIMITER ',');
    inputFiles:
      in.csv: "{{ outputs.http_download.uri }}"
    outputFiles:
       - out

Properties

url

  • Type: string
  • Dynamic: ✔️
  • Required: ✔️
  • Default: jdbc:duckdb:

The JDBC URL to connect to the database. The default value, jdbc:duckdb:, will use a local in-memory database. Set this property when connecting to a persisted database instance, for example jdbc:duckdb:md:my_database?motherduck_token=<my_token> to connect to MotherDuck.

autoCommit

  • Type: boolean
  • Dynamic:
  • Required:
  • Default: true

Whether autocommit is enabled. Sets this connection's auto-commit mode to the given state. If a connection is in auto-commit mode, then all its SQL statements will be executed and committed as individual transactions. Otherwise, its SQL statements are grouped into transactions that are terminated by a call to either the method commit or the method rollback. By default, new connections are in auto-commit mode except when you are using store property in which case the auto-commit will be disabled.

fetch

  • Type: boolean
  • Dynamic:
  • Required:
  • Default: false

Whether to fetch the data from the query result to the task output. This parameter is evaluated after fetchOne and store.

fetchOne

  • Type: boolean
  • Dynamic:
  • Required:
  • Default: false

Whether to fetch only one data row from the query result to the task output. This parameter is evaluated before store and fetch.

fetchSize

  • Type: integer
  • Dynamic:
  • Required:
  • Default: 10000

Number of rows that should be fetched. Gives the JDBC driver a hint as to the number of rows that should be fetched from the database when more rows are needed for this ResultSet object. If the fetch size specified is zero, the JDBC driver ignores the value and is free to make its own best guess as to what the fetch size should be. Ignored if autoCommit is false.

inputFiles

  • Type: object
  • SubType: string
  • Dynamic: ✔️
  • Required:

Input files to be loaded from DuckDb. Describe a files map that will be written and usable by DuckDb. You can reach files using a workingDir variable, example: SELECT * FROM read_csv_auto('{{ workingDir }}/myfile.csv');

outputFiles

  • Type: array
  • SubType: string
  • Dynamic:
  • Required:

Output file list that will be uploaded to internal storage. List of keys that will generate temporary files. On the SQL query, you can just use a variable named outputFiles.key for the corresponding file. If you add a file with ["first"], you can use the special vars COPY tbl TO '{{ outputFiles.first }}' (HEADER, DELIMITER ','); and use this file in others tasks using .

password

  • Type: string
  • Dynamic: ✔️
  • Required:

The database user's password.

sql

  • Type: string
  • Dynamic: ✔️
  • Required:

The SQL query to run.

store

  • Type: boolean
  • Dynamic:
  • Required:
  • Default: false

Whether to fetch data row(s) from the query result to a file in internal storage. File will be saved as Amazon Ion (text format). See Amazon Ion documentation This parameter is evaluated after fetchOne but before fetch.

timeZoneId

  • Type: string
  • Dynamic:
  • Required:

The time zone id to use for date/time manipulation. Default value is the worker's default time zone id.

username

  • Type: string
  • Dynamic: ✔️
  • Required:

The database user.

Outputs

outputFiles

  • Type: object
  • SubType: string
  • Dynamic:
  • Required:

The output files' URI in Kestra's internal storage.

row

  • Type: object
  • Dynamic:
  • Required:

Map containing the first row of fetched data. Only populated if fetchOne parameter is set to true.

rows

  • Type: array
  • SubType: object
  • Dynamic:
  • Required:

List of map containing rows of fetched data. Only populated if fetch parameter is set to true.

size

  • Type: integer
  • Dynamic:
  • Required:

The number of rows fetched. Only populated if store or fetch parameter is set to true.

uri

  • Type: string
  • Dynamic:
  • Required:
  • Format: uri

The URI of the result file on Kestra's internal storage (.ion file / Amazon Ion formatted text file). Only populated if store is set to true.