Correccion de cosas .w. No estoy seguro que e hecho

src/danielcortes/xyz/models/documentos/MysqlDocumentosDAO.java

@@ -203,4 +203,24 @@ public class MysqlDocumentosDAO extends DocumentosDAO {
         return updates > 0;
     }
 
+    @Override
+    public int getTotalDocumentos(Caja caja) {
+        int total = 0;
+        try {
+            Connection conn = connectionHolder.getConnection();
+            PreparedStatement ps = conn.prepareStatement("select cheques + tarjetas from documentos where caja_id = ?");
+            ps.setInt(1, caja.getId());
+
+            ResultSet rs = ps.executeQuery();
+            rs.next();
+            total = rs.getInt(1);
+
+            rs.close();
+            ps.close();
+            conn.close();
+        } catch (SQLException e) {
+            e.printStackTrace();
+        }
+        return total;
+    }
 }