started adding comments, restructured Database class

src/main/java/de/srsoftware/widerhall/data/User.java

@@ -19,6 +19,8 @@ public class User {
     private static final HashMap<String,User> users = new HashMap<>();
     public static final int PERMISSION_ADMIN = 1;
     public static final int PERMISSION_CREATE_LISTS = 2;
+    public static final String SALT = "salt";
+    public static final String HASHED_PASS = "hashedPassword";
 
     private String email, salt, hashedPass, name;
     private int permissions;
@@ -56,7 +58,12 @@ public class User {
 
     public void addPermission(int newPermission) throws SQLException {
         permissions |= newPermission;
-        Database.open().update(TABLE_NAME).set(PERMISSIONS,permissions).where(EMAIL,email()).run();
+        Database.open()
+                .update(TABLE_NAME)
+                .set(PERMISSIONS,permissions)
+                .where(EMAIL,email())
+                .compile()
+                .run();
     }
 
 
@@ -81,12 +88,12 @@ public class User {
                 .append(HASHED_PASS).append(" ").append(VARCHAR)
 
                 .append(");");
-        Database.open().query(sql).run();
+        Database.open().query(sql).compile().run();
     }
 
     public void dropPermission(int newPermission) throws SQLException {
         permissions ^= (permissions & newPermission);
-        Database.open().update(TABLE_NAME).set(PERMISSIONS,permissions).run();
+        Database.open().update(TABLE_NAME).set(PERMISSIONS,permissions).compile().run();
     }
 
     public boolean hashPermission(int permission){
@@ -102,7 +109,7 @@ public class User {
         var userList = new ArrayList<User>();
         var query = Database.open().select(TABLE_NAME);
         if (emails != null && !emails.isEmpty()) query.where(EMAIL,emails);
-        var rs = query.exec();
+        var rs = query.compile().exec();
         while (rs.next()) userList.add(User.from(rs));
         return userList;
     }
@@ -124,6 +131,7 @@ public class User {
         ResultSet rs = Database.open()
                 .select(TABLE_NAME)
                 .where(EMAIL,email)
+                .compile()
                 .exec();
         try {
             if (rs.next()) {
@@ -145,7 +153,7 @@ public class User {
 
 
     public static boolean noUsers() throws SQLException {
-        var rs = Database.open().select(TABLE_NAME,"count(*)").exec();
+        var rs = Database.open().select(TABLE_NAME,"count(*)").compile().exec();
         try {
             if (rs.next()) {
                 return rs.getInt(1) < 1;
@@ -175,6 +183,7 @@ public class User {
         if (hashedPass != null) values.put(HASHED_PASS,hashedPass);
         Database.open().insertInto(TABLE_NAME)
                 .values(values)
+                .compile()
                 .run();
         return this;
     }