Connect ChistaDATA DBaaS ClickHouse Cluster with Java

Database as a Service (DBaaS) is a managed service offered by the cloud that allows access to databases without the demand for physical hardware setup, software installation, or database setup. The ChistaDATA DBaaS Platform for ClickHouse is aimed at providing fast, reliable, and functional solutions for users.

In this blog post, we would like to explain, with examples, how to connect to the ClickHouse cluster created in ChistaDATA DBaaS with JAVA.

Prerequisites

To connect to ClickHouse via Java, you can use the official ClickHouse JDBC driver, which provides a JDBC-compliant interface for accessing ClickHouse. Here are the prerequisites and steps to get started:

• Java Development Kit (JDK) installed on your system
• ClickHouse server installed and running
• ClickHouse JDBC driver jar file

Steps

1. Download the ClickHouse JDBC driver jar file from the official website: https://clickhouse.com/docs/en/interfaces/jdbc
2. Add the JDBC driver jar file to your Java project’s classpath.
3. Import the necessary JDBC classes in your Java code:

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

4. Create a connection to the ClickHouse server using the DriverManager class:

First Login ChistaDATA Cloud. Enter your ClickHouse Cluster. On the right panel, you will see “Connect” button. Click on it and you will see your cloud login informations.

Replace “localhost” with the IP address or hostname of your ClickHouse server, and “default” with the name of the ClickHouse database you want to connect to.

String url = "jdbc:clickhouse://localhost:9440/default";
String user = "your_username";
String password = "your_password";
Connection connection = DriverManager.getConnection(url, user, password);

5. Create a statement object to execute SQL queries on the ClickHouse database:

Statement statement = connection.createStatement();

6. Execute SQL queries using the statement object:

ResultSet resultSet = statement.executeQuery("SELECT * FROM my_table");
while (resultSet.next()) {
  // Process the query results
}

7. Close the statement and connection objects when you are done:

resultSet.close();
statement.close();
connection.close();

That’s it! With these steps, you should be able to connect to ClickHouse via Java and execute SQL queries.

In this blog, we talked about the DBaaS concept, the ChistaDATA DBaaS Portal, and connecting from Java to ClickHouse with explanations and examples. Please visit here to find various connection examples and FAQs.