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How to Connect Applications to Your Deployment

Reviewed on 03 June 2025 • Published on 03 June 2025

This page explains how to connect yourself or your applications to your Data Warehouse for ClickHouse® deployment using the Scaleway console.

To connect your deployment with BI tools, refer to the dedicated documentation.

Before you startLink to this anchor

To complete the actions presented below, you must have:

A Scaleway account logged into the console
Owner status or IAM permissions allowing you to perform actions in the intended Organization
Signed up to the private beta and received a confirmation email.
Created a Data Warehouse deployment

Click ClickHouse® under Data & Analytics on the side menu. The Data Warehouse deployment page displays.
Click the name of the Data Warehouse deployment you want to connect to. The overview tab of the deployment displays.
Click the Actions button in the top-right corner of the page. A drop-down menu displays.
Select Connect using frameworks. The connection wizard displays.

Note
To connect your deployment with BI tools, refer to the dedicated documentation.

Select your preferred framework:

Protocols

Select the appropriate protocol, then run the displayed command in a terminal. Remember to replace the placeholders with the appropriate values, and to specify the correct path to the certificate file.

clickhouse client \
--host <YOUR_DEPLOYMENT_ID>.dtwh.<REGION>.scw.cloud \
--port 9440 \
--secure \
--user scwadmin \
--password '<PASSWORD>'

  mysql -h <YOUR_DEPLOYMENT_ID>.dtwh.<REGION>.scw.cloud \
  -P 9004 \
  -u scwadmin \
  --password='<PASSWORD>' -e "SELECT 1;"

Note

MySQL connection is exposed publicly. Use ClickHouse® CLI for a secure connection.

echo 'SELECT 1' | curl 'https://scwadmin:<PASSWORD>@<YOUR_DEPLOYMENT_ID>.dtwh.<REGION>.scw.cloud:443' -d @-

Note

curl only works with SQL queries, and does not allow direct connection to your Data Warehouse for ClickHouse® deployment.

Languages

Select the desired language, then run the code displayed to create a file that connects to your deployment, and run queries programmatically. Remember to replace the placeholders with the appropriate values, and to specify the correct path to the certificate file.

pip install clickhouse-connect
cat <<EOF >clickhouse.py
import clickhouse_connect
client = clickhouse_connect.get_client(
    host="<YOUR_DEPLOYMENT_ID>.dtwh.<REGION>.scw.cloud",
    port=443,
    username="scwadmin",
    password="<PASSWORD>",
)
query_result = client.query("SELECT 1")
print(query_result.result_set)
EOF
python clickhouse.py

mkdir ClickHouse-go
cd ClickHouse-go
go mod init ClickHouse-go
cat <<EOF >main.go
package main
import (
      "context"
      "fmt"
      "log"
      "github.com/ClickHouse/clickhouse-go/v2"
)
func main() {
      conn, err := clickhouse.Open(&clickhouse.Options{
          Addr: []string{"f133556f-8578-486f-be7f-49f7da08b728.dtwh.fr-par.scw.cloud:9440"},
          Auth: clickhouse.Auth{
              Database: "default",
              Username: "scwadmin",
              Password: "PASSWORD",
          },
      })
      if err != nil {
          log.Fatal(err)
      }
      defer conn.Close()
      ctx := context.Background()
      var result string
      if err := conn.QueryRow(ctx, "SELECT 1").Scan(&result); err != nil {
          log.Fatal(err)
      }
      fmt.Println(result)
}
EOF
go run .

npm i @clickhouse/client
cat <<EOF >clickhouse.js
import { createClient } from '@clickhouse/client'
void (async () => {
  const client = createClient({
    url: 'https://f133556f-8578-486f-be7f-49f7da08b728.dtwh.fr-par.scw.cloud:443',
    username: 'scwadmin',
    password: 'PASSWORD'
  })
  const rows = await client.query({
    query: 'SELECT 1',
    format: 'JSONEachRow',
  })
  console.info(await rows.json())
  await client.close()
})()
EOF
node clickhouse.js

cat <<EOF >pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"
    xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
    <modelVersion>4.0.0</modelVersion>
    <groupId>clickhouse-java</groupId>
    <artifactId>clickhouse-java</artifactId>
    <version>1.0.0</version>
    <packaging>jar</packaging>
    <dependencies>
        <dependency>
            <groupId>com.clickhouse</groupId>
            <artifactId>clickhouse-jdbc</artifactId>
            <version>0.7.2</version>
        </dependency>
    </dependencies>
</project>
EOF
mkdir -p src/main/java
cat <<EOF >src/main/java/Main.java
import java.sql.*;
import java.lang.ClassNotFoundException;
public class Main {
  public static void main(String[] args) throws SQLException, ClassNotFoundException {
    Class.forName("com.clickhouse.jdbc.ClickHouseDriver");
    String url = "jdbc:ch://scwadmin:PASSWORD@f133556f-8578-486f-be7f-49f7da08b728.dtwh.fr-par.scw.cloud:443/default?ssl=true";
    try (Connection con = DriverManager.getConnection(url); Statement stmt = con.createStatement()) {
      ResultSet result_set = stmt.executeQuery("SELECT 1 AS one");
      while (result_set.next()) {
        System.out.println(result_set.getInt("one"));
      }
    }
  }
}
EOF
mvn clean compile
mvn exec:java -Dexec.mainClass=Main

You are now connected to your Data Warehouse for ClickHouse® deployment using the administrator account.