added invoice and order collection

src/main/java/com/bib/essensbestellungsverwaltung/Database.java

@@ -119,6 +119,7 @@ public class Database {
                 food2 integer,
                 dessert1 integer,
                 dessert2 integer,
+                issent integer DEFAULT '0',
                 FOREIGN KEY(food1) REFERENCES food(id),
                 FOREIGN KEY(food2) REFERENCES food(id),
                 FOREIGN KEY(dessert1) REFERENCES food(id),
@@ -396,6 +397,38 @@ public class Database {
                 }
                 sb.append(");");
             }
+            case "count" -> {
+                sb = new StringBuilder("SELECT COUNT(*) FROM ");
+                sb.append(table);
+                sb.append(" WHERE ");
+                sb.append(header[0]);
+                sb.append(" = ");
+                sb.append(values[0]);
+                for(int i = 1; i < header.length; i++){
+                    sb.append(" AND ");
+                    sb.append(header[i]);
+                    sb.append(" = ");
+                    sb.append(values[i]);
+                }
+            }
+            case "update" -> {
+                sb = new StringBuilder("UPDATE ");
+                sb.append(table);
+                sb.append(" SET ");
+                sb.append(header[1]);
+                sb.append(" = ");
+                sb.append(values[1]);
+                for(int i = 2; i < header.length; i++){
+                    sb.append(", ");
+                    sb.append(header[i]);
+                    sb.append(" = ");
+                    sb.append(values[i]);
+                }
+                sb.append(" WHERE ");
+                sb.append(header[0]);
+                sb.append(" = ");
+                sb.append(values[0]);
+            }
         }
         sql = sb.toString();
         return sql;
@@ -475,4 +508,25 @@ public class Database {
         }
         return data;
     }
+
+    protected static int count(String table,String[] header,String[] values){
+        String sql = queryBuilder("count",table,header,values);
+        try(Connection conn = connect()) {
+            PreparedStatement ps = conn.prepareStatement(sql);
+            ResultSet rs = ps.executeQuery();
+            return rs.getInt(1);
+        }catch (SQLException e){
+            return -1;
+        }
+    }
+
+    protected static int update(String table,String[] header,String[] values){
+        try(Connection conn = connect()) {
+            String sql = queryBuilder("update",table,header,values);
+            PreparedStatement ps = conn.prepareStatement(sql);
+            return ps.executeUpdate();
+        }catch (SQLException e){
+            return  -1;
+        }
+    }
 }