Connect an application YSQL

• YSQL
• YCQL

• YugabyteDB JDBC Smart Driver
• YugabyteDB R2DBC Smart Driver
• PostgreSQL JDBC Driver
• Vert.x Pg Client

YugabyteDB JDBC Smart Driver is a JDBC driver for YSQL built on the PostgreSQL JDBC driver, with additional connection load balancing features.

For Java applications, the JDBC driver provides database connectivity through the standard JDBC application program interface (APIs) available on the Java platform.

CRUD operations

The following sections demonstrate how to perform common tasks required for Java application development.

To start building your application, make sure you have met the prerequisites.

Step 1: Set up the client dependencies

Maven dependency

If you are using Maven, add the following to your pom.xml of your project.

<dependency>
  <groupId>com.yugabyte</groupId>
  <artifactId>jdbc-yugabytedb</artifactId>
  <version>42.7.3-yb-1</version>
</dependency>

<!-- https://mvnrepository.com/artifact/com.zaxxer/HikariCP -->
<dependency>
  <groupId>com.zaxxer</groupId>
  <artifactId>HikariCP</artifactId>
  <version>5.0.1</version>
</dependency>

Note that v4 of HikariCP is required because the YugabyteDB JDBC Driver requires Java 8.

Install the added dependency using mvn install.

Gradle dependency

If you are using Gradle, add the following dependencies to your build.gradle file:

implementation 'com.yugabyte:jdbc-yugabytedb:42.7.3-yb-1'
implementation 'com.zaxxer:HikariCP:5.0.1'

Step 2: Set up the database connection

After setting up the dependencies, implement the Java client application using the YugabyteDB JDBC driver to connect to your YugabyteDB cluster and run queries on the sample data.

Set up the driver properties to configure the credentials and SSL certificates for connecting to your cluster. Java applications can connect to and query the YugabyteDB database using the java.sql.DriverManager class. All the JDBC interfaces required for working with YugabyteDB database are part of the java.sql.* package.

Use the DriverManager.getConnection method to obtain the connection object for the YugabyteDB database, which can then be used to perform DDL and DML operations against the database.

The following table describes the connection parameters required to connect, including smart driver parameters for uniform and topology load balancing.

In v42.7.3-yb-1 and later, the load-balance property supports the following additional properties: any (alias for 'true'), only-primary, only-rr, prefer-primary, and prefer-rr. See Node type-aware load balancing.

The following is an example JDBC URL for connecting to YugabyteDB:

jdbc:yugabytedb://hostname:port/database?user=yugabyte&password=yugabyte&load-balance=true& \
    yb-servers-refresh-interval=240& \
    topology-keys=cloud.region.zone1,cloud.region.zone2

After the driver establishes the initial connection, it fetches the list of available servers from the cluster, and load balances subsequent connection requests across these servers.

Use multiple addresses

You can specify multiple hosts in the connection string to provide alternative options during the initial connection in case the primary address fails.

Delimit the addresses using commas, as follows:

jdbc:yugabytedb://hostname1:port,hostname2:port,hostname3:port/database?user=yugabyte&password=yugabyte&load-balance=true& \
    topology-keys=cloud.region.zone1,cloud.region.zone2

The hosts are only used during the initial connection attempt. If the first host is down when the driver is connecting, the driver attempts to connect to the next host in the string, and so on.

Use SSL

The following table describes the connection parameters required to connect using SSL.

The following is an example JDBC URL for connecting to a YugabyteDB cluster with SSL encryption enabled.

jdbc:yugabytedb://hostname:port/database?user=yugabyte&password=yugabyte&load-balance=true& \
    ssl=true&sslmode=verify-full&sslrootcert=~/.postgresql/root.crt

If you created a cluster on YugabyteDB Aeon, use the cluster credentials and download the SSL Root certificate.

To use load balancing and SSL mode verify-full with a cluster in YugabyteDB Aeon, you need to provide the additional sslhostnameverifier parameter, set to com.yugabyte.ysql.YBManagedHostnameVerifier. (Available in driver version 42.3.5-yb-2 or later. For previous versions of the driver, use verify-ca.)

Step 3: Write your application

Create a new Java class called QuickStartApp.java in the base package directory of your project as follows:

touch ./src/main/java/com/yugabyte/QuickStartApp.java

Copy the following code to set up a YugabyteDB table and query the table contents from the Java client. Be sure to replace the connection string yburl with credentials of your cluster and SSL certificate if required.

package com.yugabyte;

import com.zaxxer.hikari.HikariConfig;
import com.zaxxer.hikari.HikariDataSource;

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

public class QuickStartApp {
  public static void main(String[] args) throws ClassNotFoundException, SQLException {
    Class.forName("com.yugabyte.Driver");
    String yburl = "jdbc:yugabytedb://127.0.0.1:5433/yugabyte?user=yugabyte&password=yugabyte&load-balance=true";
    // If you have a read replica cluster and want to balance
    // connections across only read replica nodes,
    // set the load-balance property to 'only-rr' as follows:
    // String yburl = "jdbc:yugabytedb://127.0.0.1:5433/yugabyte?user=yugabyte&password=yugabyte&load-balance=only-rr";
    Connection conn = DriverManager.getConnection(yburl);
    Statement stmt = conn.createStatement();
    try {
        System.out.println("Connected to the YugabyteDB Cluster successfully.");
        stmt.execute("DROP TABLE IF EXISTS employee");
        stmt.execute("CREATE TABLE IF NOT EXISTS employee" +
                    "  (id int primary key, name varchar, age int, language text)");
        System.out.println("Created table employee");

        String insertStr = "INSERT INTO employee VALUES (1, 'John', 35, 'Java')";
        stmt.execute(insertStr);
        System.out.println("EXEC: " + insertStr);

        ResultSet rs = stmt.executeQuery("select * from employee");
        while (rs.next()) {
          System.out.println(String.format("Query returned: name = %s, age = %s, language = %s",
                                          rs.getString(2), rs.getString(3), rs.getString(4)));
        }
    } catch (SQLException e) {
      System.err.println(e.getMessage());
    }
  }
}

Run the application

Run the project QuickStartApp.java using the following command:

mvn -q package exec:java -DskipTests -Dexec.mainClass=com.yugabyte.QuickStartApp

You should see output similar to the following:

Connected to the YugabyteDB Cluster successfully.
Created table employee
Inserted data: INSERT INTO employee (id, name, age, language) VALUES (1, 'John', 35, 'Java');
Query returned: name=John, age=35, language: Java

If you receive no output or an error, check the parameters in the connection string.

Learn more

• YugabyteDB smart drivers for YSQL
• Smart Driver architecture
• Develop Spring Boot applications using the YugabyteDB JDBC Driver