Add DEBUG messages to get methods. Fix the income and asset tables not existing if db upgrade is not run.

lib/db.dart

@@ -3,6 +3,7 @@
 // SQLite
 import 'dart:io';
 import 'dart:async';
+import 'package:flutter/material.dart';
 import 'package:path/path.dart';
 import 'package:path_provider/path_provider.dart';
 import 'package:sqflite/sqflite.dart';
@@ -34,6 +35,26 @@ class DatabaseHelper {
   }
 
   Future _onCreate(Database db, int version) async {
+    debugPrint(
+      "_onCreate(): version=$version",
+    );
+    _createExpense(db);
+    _createIncome(db);
+    _createAsset(db);
+  }
+
+  Future _onUpgrade(Database db, int previousVersion, int newVersion) async {
+    debugPrint(
+      "_onUpgrade(): previousVersion=$previousVersion, newVersion=$newVersion",
+    );
+    // Added in DB version 2.
+    if (previousVersion < 2 && newVersion >= 2) {
+      _createIncome(db);
+      _createAsset(db);
+    }
+  }
+
+  void _createExpense(Database db) async {
     await db.execute("""
       CREATE TABLE expense
         ( id INTEGER PRIMARY KEY
@@ -41,41 +62,45 @@ class DatabaseHelper {
         , cost DOUBLE NOT NULL
         , frequency TEXT NOT NULL
         , description TEXT
-      )
-      """);
+      )""");
   }
 
-  Future _onUpgrade(Database db, int previousVersion, int newVersion) async {
-    // Added in DB version 2.
-    if (previousVersion < 2 && newVersion >= 2) {
-      await db.execute("""
-        CREATE TABLE income
-          ( id INTEGER PRIMARY KEY
-          , name TEXT NOT NULL UNIQUE
-          , revenue DOUBLE NOT NULL
-          , frequency TEXT NOT NULL
-          , description TEXT
-        )
-        """);
-      await db.execute("""
-        CREATE TABLE asset
-          ( id INTEGER PRIMARY KEY
-          , name TEXT NOT NULL UNIQUE
-          , amount DOUBLE NOT NULL
-          , description TEXT
-        )
-        """);
-    }
+  void _createIncome(Database db) async {
+    await db.execute("""
+      CREATE TABLE income
+        ( id INTEGER PRIMARY KEY
+        , name TEXT NOT NULL UNIQUE
+        , revenue DOUBLE NOT NULL
+        , frequency TEXT NOT NULL
+        , description TEXT
+      )""");
+  }
+
+  void _createAsset(Database db) async {
+    await db.execute("""
+      CREATE TABLE asset
+        ( id INTEGER PRIMARY KEY
+        , name TEXT NOT NULL UNIQUE
+        , amount DOUBLE NOT NULL
+        , description TEXT
+      )""");
   }
 
   /// Expense Section
   ///
   Future<List<Expense>> getExpenses() async {
+    debugPrint("getExpenses(): Accessing db.");
     Database db = await instance.db;
+
+    debugPrint("getExpenses(): Querying table.");
     var expenses = await db.query("expense", orderBy: "name");
+
+    debugPrint("getExpenses(): Putting into object list.");
     List<Expense> expenseList = expenses.isNotEmpty
         ? expenses.map((c) => Expense.fromMap(c)).toList()
         : [];
+
+    debugPrint("getExpenses(): Returning!");
     return expenseList;
   }
 
@@ -121,11 +146,18 @@ class DatabaseHelper {
   /// Income Section
   ///
   Future<List<Income>> getIncomes() async {
+    debugPrint("getIncomes(): Accessing db.");
     Database db = await instance.db;
+
+    debugPrint("getIncomes(): Querying table.");
     var incomes = await db.query("income", orderBy: "name");
+
+    debugPrint("getIncomes(): Putting into object list.");
     List<Income> incomeList = incomes.isNotEmpty
         ? incomes.map((c) => Income.fromMap(c)).toList()
         : [];
+
+    debugPrint("getIncomes(): Returning!");
     return incomeList;
   }
 
@@ -169,10 +201,17 @@ class DatabaseHelper {
   ///
   /// Liquid Asset Section
   Future<List<Asset>> getAssets() async {
+    debugPrint("getAssets(): Accessing db.");
     Database db = await instance.db;
+
+    debugPrint("getAssets(): Querying table.");
     var assets = await db.query("asset", orderBy: "name");
+
+    debugPrint("getAssets(): Putting into object list.");
     List<Asset> assetList =
         assets.isNotEmpty ? assets.map((c) => Asset.fromMap(c)).toList() : [];
+
+    debugPrint("getAssets(): Returning!");
     return assetList;
   }