you can use the PostgreSQL JDBC driver,

you can use the PostgreSQL JDBC driver,

this a basic implementation for connecting to a sql database:

```java

package com.springboot.server.authenticationservice.repository;

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.SQLException;

import org.springframework.beans.factory.annotation.Value;

import org.springframework.context.annotation.Bean;

import org.springframework.context.annotation.Configuration;

@Configuration

public class PostgreSQLConnection {

@Value("${spring.datasource.url}")

private String dbUrl;

@Value("${spring.datasource.username}")

private String dbUsername;

@Value("${spring.datasource.password}")

private String dbPassword;

@Bean

public Connection getConnection() throws SQLException {

return DriverManager.getConnection(dbUrl, dbUsername, dbPassword);

}

}

```