trabajando en usuarios

src/main/java/com/imprimelibros/erp/users/RoleDaoImpl.java

@@ -0,0 +1,33 @@
+package com.imprimelibros.erp.users;
+
+import jakarta.persistence.EntityManager;
+import jakarta.persistence.TypedQuery;
+import org.springframework.stereotype.Repository;
+
+@Repository
+public class RoleDaoImpl implements RoleDao {
+
+	private EntityManager entityManager;
+
+	public RoleDaoImpl(EntityManager theEntityManager) {
+		entityManager = theEntityManager;
+	}
+
+	@Override
+	public Role findRoleByName(String theRoleName) {
+
+		// retrieve/read from database using name
+		TypedQuery<Role> theQuery = entityManager.createQuery("from Role where name=:roleName", Role.class);
+		theQuery.setParameter("roleName", theRoleName);
+		
+		Role theRole = null;
+		
+		try {
+			theRole = theQuery.getSingleResult();
+		} catch (Exception e) {
+			theRole = null;
+		}
+		
+		return theRole;
+	}
+}