how to use entity manager in spring data jpa code example

Example 1: spring boot entitymanager example

entityManager.getTransaction().begin();
		entityManager.remove(emp);
		entityManager.getTransaction().commit();

Example 2: spring boot hibernate entitymanager

<persistence xmlns="http://xmlns.jcp.org/xml/ns/persistence"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence
             http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd"
	version="2.1">
 
	<persistence-unit name="persistence">
		<description>JPA Entity Manager</description>
		<provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
 
		<properties>
			<property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver" />
			<property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost:3306/test" />
			<property name="hibernate.hbm2ddl.auto" value="update" />
			<property name="javax.persistence.jdbc.user" value="root" />
			<property name="javax.persistence.jdbc.password" value="root" />
			<property name="hibernate.show_sql" value="true" />
		</properties>
 
	</persistence-unit>
 
</persistence>