diff --git a/build/classes/library/Book.class b/build/classes/library/Book.class
index 0ec99b5..b3c5974 100644
Binary files a/build/classes/library/Book.class and b/build/classes/library/Book.class differ
diff --git a/src/library/Book.java b/src/library/Book.java
index d54b5af..449818c 100644
--- a/src/library/Book.java
+++ b/src/library/Book.java
@@ -13,13 +13,13 @@ public class Book extends Item{
    Book(){
       //nothing to do   
     }
-   Book(int id, String n, String an, String asn, int y, String isbn, String p){
+   Book(int id, String n, String an, String asn, int y, String isbn, String p, String c){
        this.setId(id);
        this.setName(n);
        this.authorName = an;
        this.authorSurname = asn;
        this.setYear(y);
-       this.setCategory("NULL");
+       this.setCategory(c);
        this.ISBN = isbn;
        this.publishing = p;
    }
diff --git a/src/library/Database.java b/src/library/Database.java
index 90aba20..3300bd3 100644
--- a/src/library/Database.java
+++ b/src/library/Database.java
@@ -20,7 +20,7 @@ import javax.swing.JOptionPane;
 public class Database {
     
     public static final String DRIVER = "org.sqlite.JDBC";
-    public static final String DB_URL = "jdbc:sqlite:biblioteka.db";
+    public static final String DB_URL = "jdbc:sqlite:biblioteka.db"; // ścieżka do bazy
  
     private Connection conn;
     private Statement stat;
@@ -53,59 +53,46 @@ public class Database {
             stat.execute(createAlbums);
             stat.execute(createMovies);
         } catch (SQLException e) {
-            System.err.println("Blad przy tworzeniu tabeli");
+            JOptionPane.showMessageDialog(null, "Błąd przy tworzeniu tabel bazy danych.", "Error:", JOptionPane.INFORMATION_MESSAGE);
             return false;
         }
         return true;
     }
 
  
-    public List<Book> selectCzytelnicy() {
+    public List<Book> selectBooks() {
         List<Book> books = new LinkedList<Book>();
         try {
             ResultSet result = stat.executeQuery("SELECT * FROM books");
-            int id;
-            String imie, nazwisko, pesel;
+            int id, year;
+            String name, authorName, authorSurname, isbn, category, publishing;
             while(result.next()) {
-                id = result.getInt("id_czytelnika");
-                imie = result.getString("imie");
-                nazwisko = result.getString("nazwisko");
-                pesel = result.getString("pesel");
-                books.add(new books(id, imie, nazwisko, pesel));
+                id = result.getInt("id");
+                year = result.getInt("year");
+                name = result.getString("name");
+                authorName = result.getString("author_name");
+                authorSurname = result.getString("author_surname");
+                publishing = result.getString("publishing");
+                isbn = result.getString("isbn");
+                category = result.getString("category");
+           
+                books.add(new Book(id, name, authorName, authorSurname, year, isbn, publishing, category));
             }
         } catch (SQLException e) {
             JOptionPane.showMessageDialog(null, "Błąd przy odczycie z bazy.", "Error:", JOptionPane.INFORMATION_MESSAGE);
         }
-        return czytelnicy;
-    }
- 
-    public List<Ksiazka> selectKsiazki() {
-        List<Ksiazka> ksiazki = new LinkedList<Ksiazka>();
-        try {
-            ResultSet result = stat.executeQuery("SELECT * FROM ksiazki");
-            int id;
-            String tytul, autor;
-            while(result.next()) {
-                id = result.getInt("id_ksiazki");
-                tytul = result.getString("tytul");
-                autor = result.getString("autor");
-                ksiazki.add(new Ksiazka(id, tytul, autor));
-            }
-        } catch (SQLException e) {
-            e.printStackTrace();
-            return null;
-        }
-        return ksiazki;
+        return books;
     }
+
+    
  
     public void closeConnection() {
         try {
             conn.close();
         } catch (SQLException e) {
-            System.err.println("Problem z zamknieciem polaczenia");
+            JOptionPane.showMessageDialog(null, "Problem z zamknięciem połączenia.", "Error:", JOptionPane.INFORMATION_MESSAGE);
             e.printStackTrace();
         }
     }
 }
     
-}