diff --git a/src/main/java/xyz/danielcortes/framework/BaseRepository.java b/src/main/java/xyz/danielcortes/framework/BaseRepository.java
new file mode 100644
index 0000000..de3c765
--- /dev/null
+++ b/src/main/java/xyz/danielcortes/framework/BaseRepository.java
@@ -0,0 +1,52 @@
+package xyz.danielcortes.framework;
+
+import javax.persistence.EntityManager;
+import javax.persistence.PersistenceException;
+
+public abstract class BaseRepository<E> {
+
+  protected EntityManager em;
+
+  public BaseRepository() {
+    this.em = PersistenceManager.getEntityManager();
+  }
+
+  public void save(E entity) {
+    em.getTransaction().begin();
+
+    try {
+      em.persist(entity);
+    } catch (PersistenceException e) {
+      e.printStackTrace();
+      em.getTransaction().rollback();
+    }
+
+    em.getTransaction().commit();
+  }
+
+  public void update(E entity) {
+    em.getTransaction().begin();
+
+    try {
+      em.merge(entity);
+    } catch (PersistenceException e) {
+      e.printStackTrace();
+      em.getTransaction().rollback();
+    }
+
+    em.getTransaction().commit();
+  }
+
+  public void delete(E entity) {
+    em.getTransaction().begin();
+
+    try {
+      em.remove(entity);
+    } catch (PersistenceException e) {
+      e.printStackTrace();
+      em.getTransaction().rollback();
+    }
+
+    em.getTransaction().commit();
+  }
+}
diff --git a/src/main/java/xyz/danielcortes/repository/AutorRepository.java b/src/main/java/xyz/danielcortes/repository/AutorRepository.java
index 962c128..ec41f5a 100644
--- a/src/main/java/xyz/danielcortes/repository/AutorRepository.java
+++ b/src/main/java/xyz/danielcortes/repository/AutorRepository.java
@@ -1,22 +1,14 @@
 package xyz.danielcortes.repository;
 
 import java.util.List;
-import javax.persistence.EntityManager;
-import javax.persistence.PersistenceException;
 import javax.persistence.TypedQuery;
 import javax.persistence.criteria.CriteriaBuilder;
 import javax.persistence.criteria.CriteriaQuery;
 import javax.persistence.criteria.Root;
-import xyz.danielcortes.framework.PersistenceManager;
+import xyz.danielcortes.framework.BaseRepository;
 import xyz.danielcortes.models.Autor;
 
-public class AutorRepository {
-
-  private EntityManager em;
-
-  public AutorRepository() {
-    this.em = PersistenceManager.getEntityManager();
-  }
+public class AutorRepository extends BaseRepository<Autor> {
 
   public List<Autor> getAll() {
     TypedQuery<Autor> query = em.createQuery("SELECT a FROM Autor a", Autor.class);
@@ -36,41 +28,4 @@ public class AutorRepository {
     );
     return em.createQuery(query).getResultList();
   }
-
-  public void save(Autor autor) {
-    em.getTransaction().begin();
-
-    try {
-      em.persist(autor);
-    } catch (PersistenceException e) {
-      e.printStackTrace();
-    }
-
-    em.getTransaction().commit();
-  }
-
-  public void update(Autor autor) {
-    em.getTransaction().begin();
-
-    try {
-      em.merge(autor);
-    } catch (PersistenceException e) {
-      e.printStackTrace();
-    }
-
-    em.getTransaction().commit();
-  }
-
-  public void delete(Autor autor) {
-    em.getTransaction().begin();
-
-    try {
-      em.remove(autor);
-    } catch (PersistenceException e) {
-      e.printStackTrace();
-    }
-
-    em.getTransaction().commit();
-  }
-
 }
diff --git a/src/main/java/xyz/danielcortes/repository/CategoriaRepository.java b/src/main/java/xyz/danielcortes/repository/CategoriaRepository.java
index f1b063a..c0855f1 100644
--- a/src/main/java/xyz/danielcortes/repository/CategoriaRepository.java
+++ b/src/main/java/xyz/danielcortes/repository/CategoriaRepository.java
@@ -1,22 +1,14 @@
 package xyz.danielcortes.repository;
 
 import java.util.List;
-import javax.persistence.EntityManager;
-import javax.persistence.PersistenceException;
 import javax.persistence.TypedQuery;
 import javax.persistence.criteria.CriteriaBuilder;
 import javax.persistence.criteria.CriteriaQuery;
 import javax.persistence.criteria.Root;
-import xyz.danielcortes.framework.PersistenceManager;
+import xyz.danielcortes.framework.BaseRepository;
 import xyz.danielcortes.models.Categoria;
 
-public class CategoriaRepository {
-
-  private EntityManager em;
-
-  public CategoriaRepository() {
-    this.em = PersistenceManager.getEntityManager();
-  }
+public class CategoriaRepository extends BaseRepository<Categoria> {
 
   public List<Categoria> getAll() {
     TypedQuery<Categoria> query = em.createQuery("SELECT c from Categoria  c", Categoria.class);
@@ -32,41 +24,4 @@ public class CategoriaRepository {
     );
     return em.createQuery(query).getResultList();
   }
-
-  public void save(Categoria categoria) {
-    em.getTransaction().begin();
-
-    try {
-      em.persist(categoria);
-    } catch (
-        PersistenceException e) {
-      e.printStackTrace();
-    }
-
-    em.getTransaction().commit();
-  }
-
-  public void update(Categoria categoria) {
-    em.getTransaction().begin();
-
-    try {
-      em.merge(categoria);
-    } catch (PersistenceException e) {
-      e.printStackTrace();
-    }
-
-    em.getTransaction().commit();
-  }
-
-  public void delete(Categoria categoria) {
-    em.getTransaction().begin();
-
-    try {
-      em.remove(categoria);
-    } catch (PersistenceException e) {
-      e.printStackTrace();
-    }
-
-    em.getTransaction().commit();
-  }
 }
diff --git a/src/main/java/xyz/danielcortes/repository/EditorialRepository.java b/src/main/java/xyz/danielcortes/repository/EditorialRepository.java
index 02dd4c7..f72448f 100644
--- a/src/main/java/xyz/danielcortes/repository/EditorialRepository.java
+++ b/src/main/java/xyz/danielcortes/repository/EditorialRepository.java
@@ -1,22 +1,14 @@
 package xyz.danielcortes.repository;
 
 import java.util.List;
-import javax.persistence.EntityManager;
-import javax.persistence.PersistenceException;
 import javax.persistence.TypedQuery;
 import javax.persistence.criteria.CriteriaBuilder;
 import javax.persistence.criteria.CriteriaQuery;
 import javax.persistence.criteria.Root;
-import xyz.danielcortes.framework.PersistenceManager;
+import xyz.danielcortes.framework.BaseRepository;
 import xyz.danielcortes.models.Editorial;
 
-public class EditorialRepository {
-
-  private EntityManager em;
-
-  public EditorialRepository() {
-    this.em = PersistenceManager.getEntityManager();
-  }
+public class EditorialRepository extends BaseRepository<Editorial> {
 
   public List<Editorial> getAll() {
     TypedQuery<Editorial> query = em.createQuery("SELECT e FROM Editorial e", Editorial.class);
@@ -32,42 +24,4 @@ public class EditorialRepository {
     );
     return em.createQuery(query).getResultList();
   }
-
-  public void save(Editorial editorial) {
-    em.getTransaction().begin();
-
-    try {
-      em.persist(editorial);
-    } catch (
-        PersistenceException e) {
-      e.printStackTrace();
-    }
-
-    em.getTransaction().commit();
-  }
-
-  public void update(Editorial editorial) {
-    em.getTransaction().begin();
-
-    try{
-    em.merge(editorial);
-
-    } catch (PersistenceException e) {
-      e.printStackTrace();
-    }
-
-    em.getTransaction().commit();
-  }
-
-  public void delete(Editorial editorial) {
-    em.getTransaction().begin();
-
-    try{
-    em.remove(editorial);
-    } catch (PersistenceException e) {
-      e.printStackTrace();
-    }
-
-    em.getTransaction().commit();
-  }
 }
diff --git a/src/main/java/xyz/danielcortes/repository/EjemplarRepository.java b/src/main/java/xyz/danielcortes/repository/EjemplarRepository.java
index f9c2337..9e7e6d7 100644
--- a/src/main/java/xyz/danielcortes/repository/EjemplarRepository.java
+++ b/src/main/java/xyz/danielcortes/repository/EjemplarRepository.java
@@ -1,23 +1,15 @@
 package xyz.danielcortes.repository;
 
 import java.util.List;
-import javax.persistence.EntityManager;
-import javax.persistence.PersistenceException;
 import javax.persistence.Query;
 import javax.persistence.TypedQuery;
 import javax.persistence.criteria.CriteriaBuilder;
 import javax.persistence.criteria.CriteriaQuery;
 import javax.persistence.criteria.Root;
-import xyz.danielcortes.framework.PersistenceManager;
+import xyz.danielcortes.framework.BaseRepository;
 import xyz.danielcortes.models.Ejemplar;
 
-public class EjemplarRepository {
-
-  private EntityManager em;
-
-  public EjemplarRepository() {
-    this.em = PersistenceManager.getEntityManager();
-  }
+public class EjemplarRepository extends BaseRepository<Ejemplar> {
 
   public List<Ejemplar> getAll() {
     TypedQuery<Ejemplar> query = em.createQuery("SELECT e FROM Ejemplar e", Ejemplar.class);
@@ -37,36 +29,6 @@ public class EjemplarRepository {
     return em.createQuery(query).getResultList();
   }
 
-  public void save(Ejemplar ejemplar) {
-    em.getTransaction().begin();
-    try {
-      em.persist(ejemplar);
-    } catch (PersistenceException e) {
-      e.printStackTrace();
-    }
-    em.getTransaction().commit();
-  }
-
-  public void update(Ejemplar ejemplar) {
-    em.getTransaction().begin();
-    try {
-      em.merge(ejemplar);
-    } catch (PersistenceException e) {
-      e.printStackTrace();
-    }
-    em.getTransaction().commit();
-  }
-
-  public void delete(Ejemplar ejemplar) {
-    em.getTransaction().begin();
-    try {
-      em.remove(ejemplar);
-    } catch (PersistenceException e) {
-      e.printStackTrace();
-    }
-    em.getTransaction().commit();
-  }
-
   public boolean exists(String serie, Integer libro_id) {
     Query query = em.createQuery("SELECT count(e) FROM Ejemplar e WHERE serie = :serie and libro.id = :libro_id");
     query.setParameter("serie", serie);
diff --git a/src/main/java/xyz/danielcortes/repository/EstadoRepository.java b/src/main/java/xyz/danielcortes/repository/EstadoRepository.java
index 4bd31f8..fc87b75 100644
--- a/src/main/java/xyz/danielcortes/repository/EstadoRepository.java
+++ b/src/main/java/xyz/danielcortes/repository/EstadoRepository.java
@@ -1,19 +1,11 @@
 package xyz.danielcortes.repository;
 
 import java.util.List;
-import javax.persistence.EntityManager;
-import javax.persistence.PersistenceException;
 import javax.persistence.TypedQuery;
-import xyz.danielcortes.framework.PersistenceManager;
+import xyz.danielcortes.framework.BaseRepository;
 import xyz.danielcortes.models.Estado;
 
-public class EstadoRepository {
-
-  private EntityManager em;
-
-  public EstadoRepository() {
-    this.em = PersistenceManager.getEntityManager();
-  }
+public class EstadoRepository extends BaseRepository<Estado> {
 
   public List<Estado> getAll() {
     TypedQuery<Estado> query = em.createQuery("SELECT e FROM Estado e", Estado.class);
@@ -25,42 +17,4 @@ public class EstadoRepository {
     query.setParameter("nombre", nombre);
     return query.getSingleResult();
   }
-
-  public void save(Estado estado) {
-    em.getTransaction().begin();
-
-    try {
-      em.persist(estado);
-    } catch (PersistenceException e) {
-      e.printStackTrace();
-    }
-
-    em.getTransaction().commit();
-  }
-
-  public void update(Estado estado) {
-    em.getTransaction().begin();
-
-    try {
-      em.merge(estado);
-    } catch (PersistenceException e) {
-      e.printStackTrace();
-    }
-
-    em.getTransaction().commit();
-  }
-
-  public void delete(Estado estado) {
-    em.getTransaction().begin();
-
-    try {
-      em.remove(estado);
-
-    } catch (PersistenceException e) {
-      e.printStackTrace();
-    }
-
-    em.getTransaction().commit();
-  }
-
 }
diff --git a/src/main/java/xyz/danielcortes/repository/IdiomaRepository.java b/src/main/java/xyz/danielcortes/repository/IdiomaRepository.java
index 0fafe2b..bf31b7c 100644
--- a/src/main/java/xyz/danielcortes/repository/IdiomaRepository.java
+++ b/src/main/java/xyz/danielcortes/repository/IdiomaRepository.java
@@ -1,22 +1,14 @@
 package xyz.danielcortes.repository;
 
 import java.util.List;
-import javax.persistence.EntityManager;
-import javax.persistence.PersistenceException;
 import javax.persistence.TypedQuery;
 import javax.persistence.criteria.CriteriaBuilder;
 import javax.persistence.criteria.CriteriaQuery;
 import javax.persistence.criteria.Root;
-import xyz.danielcortes.framework.PersistenceManager;
+import xyz.danielcortes.framework.BaseRepository;
 import xyz.danielcortes.models.Idioma;
 
-public class IdiomaRepository {
-
-  private EntityManager em;
-
-  public IdiomaRepository() {
-    this.em = PersistenceManager.getEntityManager();
-  }
+public class IdiomaRepository extends BaseRepository<Idioma> {
 
   public List<Idioma> getAll() {
     TypedQuery<Idioma> query = em.createQuery("SELECT i FROM Idioma i", Idioma.class);
@@ -34,41 +26,4 @@ public class IdiomaRepository {
     );
     return em.createQuery(query).getResultList();
   }
-
-  public void save(Idioma idioma) {
-    em.getTransaction().begin();
-
-    try {
-      em.persist(idioma);
-    } catch (PersistenceException e) {
-      e.printStackTrace();
-    }
-
-    em.getTransaction().commit();
-  }
-
-  public void update(Idioma idioma) {
-    em.getTransaction().begin();
-
-    try {
-      em.merge(idioma);
-    } catch (PersistenceException e) {
-      e.printStackTrace();
-    }
-
-    em.getTransaction().commit();
-  }
-
-  public void delete(Idioma idioma) {
-    em.getTransaction().begin();
-
-    try {
-      em.remove(idioma);
-    } catch (PersistenceException e) {
-      e.printStackTrace();
-    }
-
-    em.getTransaction().commit();
-  }
-
 }
diff --git a/src/main/java/xyz/danielcortes/repository/LibroRepository.java b/src/main/java/xyz/danielcortes/repository/LibroRepository.java
index b8a5a34..67e3e17 100644
--- a/src/main/java/xyz/danielcortes/repository/LibroRepository.java
+++ b/src/main/java/xyz/danielcortes/repository/LibroRepository.java
@@ -1,22 +1,14 @@
 package xyz.danielcortes.repository;
 
 import java.util.List;
-import javax.persistence.EntityManager;
-import javax.persistence.PersistenceException;
 import javax.persistence.TypedQuery;
 import javax.persistence.criteria.CriteriaBuilder;
 import javax.persistence.criteria.CriteriaQuery;
 import javax.persistence.criteria.Root;
-import xyz.danielcortes.framework.PersistenceManager;
+import xyz.danielcortes.framework.BaseRepository;
 import xyz.danielcortes.models.Libro;
 
-public class LibroRepository {
-
-  private EntityManager em;
-
-  public LibroRepository() {
-    this.em = PersistenceManager.getEntityManager();
-  }
+public class LibroRepository extends BaseRepository<Libro> {
 
   public List<Libro> getAll() {
     TypedQuery<Libro> query = em.createQuery("SELECT l FROM Libro l", Libro.class);
@@ -36,42 +28,4 @@ public class LibroRepository {
     );
     return em.createQuery(query).getResultList();
   }
-
-  public void save(Libro libro) {
-    em.getTransaction().begin();
-
-    try {
-      em.persist(libro);
-    } catch (
-        PersistenceException e) {
-      e.printStackTrace();
-    }
-
-    em.getTransaction().commit();
-  }
-
-  public void update(Libro libro) {
-    em.getTransaction().begin();
-
-    try {
-      em.merge(libro);
-    } catch (PersistenceException e) {
-      e.printStackTrace();
-    }
-
-    em.getTransaction().commit();
-  }
-
-  public void delete(Libro libro) {
-    em.getTransaction().begin();
-
-    try {
-      em.remove(libro);
-    } catch (PersistenceException e) {
-      e.printStackTrace();
-    }
-
-    em.getTransaction().commit();
-  }
-
 }