started adding comments, restructured Database class

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

@@ -32,7 +32,7 @@ public class ListMember {
     }
 
     public static User confirm(String token) throws SQLException {
-        var rs = Database.open().select(TABLE_NAME).where(TOKEN,token).exec();
+        var rs = Database.open().select(TABLE_NAME).where(TOKEN,token).compile().exec();
         if (rs.next()){
             var lm = new ListMember(rs.getString(LIST_EMAIL),rs.getString(USER_EMAIL),rs.getInt(STATE),rs.getString(TOKEN));
             rs.close();
@@ -45,6 +45,7 @@ public class ListMember {
                         .set(STATE, newState) //drop confirmation state, set subscriber state
                         .where(LIST_EMAIL,lm.listEmail)
                         .where(USER_EMAIL,lm.userEmail)
+                        .compile()
                         .run();
             }
             return user;
@@ -70,7 +71,7 @@ public class ListMember {
                 .append(STATE).append(" ").append(INT).append(", ")
                 .append(TOKEN).append(" ").append(VARCHAR).append(", ")
                 .append("PRIMARY KEY (").append(LIST_EMAIL).append(", ").append(USER_EMAIL).append("));");
-        Database.open().query(sql).run();
+        Database.open().query(sql).compile().run();
     }
 
     public boolean hasState(int testState) {
@@ -83,7 +84,7 @@ public class ListMember {
         try {
             var request = Database.open().select(TABLE_NAME, LIST_EMAIL, STATE+" & "+STATE_OWNER+" as "+STATE);
             if (!user.hashPermission(User.PERMISSION_ADMIN)) request = request.where(USER_EMAIL, user.email()).where(STATE, STATE_OWNER);
-            var rs = request.exec();
+            var rs = request.compile().exec();
             while (rs.next()) list.add(rs.getString(LIST_EMAIL));
         } catch (SQLException e) {
             LOG.warn("Listing memberships lists failed: ",e);
@@ -97,6 +98,7 @@ public class ListMember {
                 .select(TABLE_NAME)
                 .where(LIST_EMAIL,list.email())
                 .where(USER_EMAIL,user.email())
+                .compile()
                 .exec();
         try {
             if (rs.next()) {
@@ -115,6 +117,7 @@ public class ListMember {
         var rs = Database.open()
                 .select(TABLE_NAME)
                 .where(LIST_EMAIL,listEmail)
+                .compile()
                 .exec();
         var temp = new HashMap<String,Integer>();
         while (rs.next()) temp.put(rs.getString(USER_EMAIL),rs.getInt(STATE));
@@ -139,7 +142,7 @@ public class ListMember {
         vals.put(USER_EMAIL,userEmail);
         vals.put(STATE,state);
         if (token != null) vals.put(TOKEN,token);
-        Database.open().insertInto(TABLE_NAME).values(vals).run();
+        Database.open().insertInto(TABLE_NAME).values(vals).compile().run();
         return this;
     }
 
@@ -152,6 +155,7 @@ public class ListMember {
         var rs = db.select(TABLE_NAME)
                 .where(LIST_EMAIL,list.email())
                 .where(USER_EMAIL,user.email())
+                .compile()
                 .exec();
         while (rs.next()){
             int state = Util.unset(rs.getInt(STATE),STATE_SUBSCRIBER,STATE_AWAITING_CONFIRMATION);
@@ -159,12 +163,14 @@ public class ListMember {
                 db.deleteFrom(TABLE_NAME)
                         .where(LIST_EMAIL,list.email())
                         .where(USER_EMAIL,user.email())
+                        .compile()
                         .run();
             } else { // update entry: whitdraw subscription
                 db.update(TABLE_NAME)
                         .set(STATE,state)
                         .where(LIST_EMAIL,list.email())
                         .where(USER_EMAIL,user.email())
+                        .compile()
                         .run();
             }
         }