Выпадающее меню с тремя кнопками

lib/db.dart

@@ -41,7 +41,8 @@ class SqliteHelper {
     Map session = {
       columnMerchantID: merchantID,
       columnPosID: posID,
-      columnToken: token
+      columnToken: token,
+      columnDocID: 0
     };
 
     return db.insert(tableSession, session);
@@ -49,12 +50,16 @@ class SqliteHelper {
 
   Future<String> getToken() async {
     Map session = await _getSession();
-    return session != null ? session[columnToken] : null;
+    String token = session != null ? session[columnToken] : null;
+    print('token: {$token}');
+    return token;
   }
 
   Future<String> getMerchantID() async {
     Map session = await _getSession();
-    return session != null ? session[columnMerchantID] : null;
+    String merchantID = session != null ? session[columnMerchantID] : null;
+    print('token: {$merchantID}');
+    return merchantID;
   }
 
   Future<String> getPosID() async {
@@ -62,6 +67,14 @@ class SqliteHelper {
     return session != null ? session[columnPosID] : new DateTime.now().millisecondsSinceEpoch.toString();
   }
 
+  Future<int> getDocID() async {
+    Map session = await _getSession();
+    int docID = session != null ? session[columnDocID] : 0;
+    db.update(tableSession, {columnDocID: docID + 1});
+    print('docid: {$docID}');
+    return docID;
+  }
+
   Future<Map> _getSession() async {
 
     List<Map> maps = await db.query(tableSession, columns: null);