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ODBC driver

The ClickHouse ODBC driver provides a standards-compliant interface for connecting ODBC-compatible applications to ClickHouse. It implements the ODBC API and enables applications, BI tools, and scripting environments to execute SQL queries, retrieve results, and interact with ClickHouse through familiar mechanisms.

The driver communicates with the ClickHouse server using the HTTP protocol, which is the primary protocol supported across all ClickHouse deployments. This allows the driver to operate consistently in diverse environments, including local installations, cloud-managed services, and environments where only HTTP-based access is available.

The source code of the driver is available in the ClickHouse-ODBC GitHub Repository.

Note

For better compatibility we strongly recommend to update your ClickHouse server to version 24.11 or later.

Note

This driver is under active development. Some ODBC features may not yet be fully implemented. The current version focuses on providing essential connectivity and core ODBC functionality, with additional features planned for future releases.

Your feedback is highly valuable and helps guide the prioritization of new features and improvements. If you encounter limitations, missing functionality, or unexpected behavior, please share your observations or feature requests through the issue tracker at https://github.com/ClickHouse/clickhouse-odbc/issues

Installation on Windows​

You can find the latest version of the driver at https://github.com/ClickHouse/clickhouse-odbc/releases/latest. From there you can download and execute the MSI installer and follow simple installation steps.

Testing​

You can test the driver by running this simple PowerShell script. Copy the text below, set your URL, user, password and paste the text into your PowerShell command prompt — after running $reader.GetValue(0)it should show your ClickHouse server version.

$url = "http://127.0.0.1:8123/"
$user = "default"
$password = ""
$conn = New-Object System.Data.Odbc.OdbcConnection("`
    Driver={ClickHouse ODBC Driver (Unicode)};`
    Url=$url;`
    Username=$username;`
    Password=$password")
$conn.Open()
$cmd = $conn.CreateCommand()
$cmd.CommandText = "select version()"
$reader = $cmd.ExecuteReader()
$reader.Read()
$reader.GetValue(0)
$reader.Close()
$conn.Close()

Configuration parameters​

The parameters below represent the most commonly used settings for establishing a connection with the ClickHouse ODBC driver. They cover essential authentication, connection behavior, and data-handling options. A full list of supported parameters is available in the project’s GitHub page https://github.com/ClickHouse/clickhouse-odbc.

  • Url Specifies the full HTTP(S) endpoint of the ClickHouse server. This includes the protocol, host, port, and optional path.
  • Username The username used for authentication with the ClickHouse server.
  • Password The password associated with the specified username. If not provided, the driver connects without password authentication.
  • Database The default database to use for the connection.
  • Timeout The maximum time (in seconds) the driver waits for a server response before aborting the request.
  • ClientName A custom identifier sent to the ClickHouse server as part of the client metadata. Useful for tracing or distinguishing traffic from different applications. This parameter will be a part of the User-Agent header in the HTTP requests produced by the driver.
  • Compression Enables or disables HTTP compression for request and response payloads. When enabled, it can reduce bandwidth usage and improve performance for large result sets.

Here are some examples of the full connection string passed to the driver to setup a connection.

  • A ClickHouse server locally installed on WSL instance
Driver={ClickHouse ODBC Driver (Unicode)};Url=http://localhost:8123//;Username=default
  • A ClickHouse Cloud instance.
Driver={ClickHouse ODBC Driver (Unicode)};Url=https://you-instance-url.gcp.clickhouse.cloud:8443/;Username=default;Password=your-password

Microsoft Power BI Integration​

You can use the ODBC driver to connect Microsoft Power BI to a ClickHouse server. Power BI provides two connection options: the generic ODBC connector and the ClickHouse connector, both included in standard Power BI installations.

Both connectors rely on ODBC internally, but they differ in capabilities:

  • ClickHouse Connector (recommended) Uses ODBC under the hood but supports DirectQuery mode. In this mode, Power BI automatically generates SQL queries and retrieves only the data required for each visualization or filter operation.

  • ODBC Connector Supports only Import mode. Power BI executes the user-provided query (or selects the entire table) and imports the full result set into Power BI. Subsequent refreshes re-import the entire dataset.

Choose the connector based on your use case: DirectQuery for interactive dashboards with large datasets, or Import mode when you need full local copies of the data.

For more information on integrating Microsoft Power BI with ClickHouse, see the ClickHouse documentation page on Power BI integration.