Heroku - what change in code to use postgresql instead mysql - mysql

Question

I prepared website in Spring/Maven with use of MySQL db, Tomcat. I decided to use Heroku free account, because I have domain, db and Java in one place. Problem is that Heroku uses postgresql for free but mysql is payable. I would like to ask you help and explanation clearly what I should change in my application's code(pom.xml, hibernate.properties etc) to use postgresql instead of mysql. Below I show files I think should be changed. Do I have to add any new files? I beg your indulgence.
***POM.XML***
jdbc.driver.class.name =com.mysql.jdbc.Driver
jdbc.url =jdbc:mysql://localhost:3306/web_users?useSSL=false&characterEncoding=UTF-8
jdbc.user.name =root
jdbc.password =root
hibernate.hbm2ddl.auto =update
hibernate.show_sql =true
hibernate.format_sql =true
hibernate.generate_statistics=false
***HibernateConfig.java***
#Configuration
#PropertySource(value = {"classpath:hibernate.properties"})
#EnableJpaRepositories(basePackages = "com.website.dao")
public class HibernateConfig {
#Autowired
private Environment environment;
// 1. create DataSource
#Bean
public DataSource dataSource() {
DriverManagerDataSource dataSource = new DriverManagerDataSource();
dataSource.setDriverClassName(environment.getRequiredProperty("jdbc.driver.class.name"));
dataSource.setPassword(environment.getRequiredProperty("jdbc.password"));
dataSource.setUsername(environment.getRequiredProperty("jdbc.user.name"));
dataSource.setUrl(environment.getRequiredProperty("jdbc.url"));
return dataSource;
}
// 2. EntityManagerFactory
#Bean
public EntityManagerFactory entityManagerFactory() {
HibernateJpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();
Properties properties = new Properties();
properties.put("hibernate.hbm2ddl.auto", environment.getProperty("hibernate.hbm2ddl.auto"));
properties.put("hibernate.show_sql", environment.getProperty("hibernate.show_sql"));
properties.put("hibernate.format_sql", environment.getProperty("hibernate.format_sql"));
properties.put("hibernate.generate_statistics", environment.getProperty("hibernate.generate_statistics"));
LocalContainerEntityManagerFactoryBean factoryBean = new LocalContainerEntityManagerFactoryBean();
factoryBean.setPackagesToScan("com.website.model");
factoryBean.setJpaVendorAdapter(vendorAdapter);
factoryBean.setJpaProperties(properties);
factoryBean.setDataSource(dataSource());
factoryBean.afterPropertiesSet();
return factoryBean.getObject();
}