Flutter does not run Async function - flutter

Question

I am trying to get an async function _read() to run and the function does not pass the line:
Reading reading = await helper.queryReading(rowId); in this function:
_read() async {
DatabaseHelper helper = DatabaseHelper.instance;
int rowId = 1;
//lines above here executes
Reading reading = await helper.queryReading(rowId); //this is the line it stops on
// nothing below here is executed
if (reading == null) {
print('read row $rowId: empty');
} else {
print('read row $rowId: ${reading.reading}');
}
}
It is being called from the following function
class Profile {
Widget getScreen(){
print("Attempting to read db");
_read();
return Scaffold( ...)
Here is my helper class:
import 'dart:ffi';
import 'dart:io';
import 'package:ema/Readings.dart';
import 'package:path/path.dart';
import 'package:sqflite/sqflite.dart';
import 'package:path_provider/path_provider.dart';
//table structure
final String tableName = 'Readings';
final String databasecolumnId = '_id';
final String databaseReading = 'Reading';
final String databaseDate = 'Time';
class DatabaseHelper {
//This is the name of the database file on disk
static final _databaseName = "readings.db";
//handles versioning for databases
static final _databaseVersion = 1;
//makes a singleton classs
DatabaseHelper._privateConstructor();
static final DatabaseHelper instance = DatabaseHelper._privateConstructor();
//allows only one item to access the database
static Database _database;
Future<Database> get database async {
_database = await _initDatabase();
return database;
}
//this opens and creates the database
_initDatabase() async {
// The path_provider plugin gets the right directory for Android or iOS.
Directory documentsDirectory = await getApplicationDocumentsDirectory();
String path = join(documentsDirectory.path, _databaseName);
// Open the database. Can also add an onUpdate callback parameter.
return await openDatabase(path,
version: _databaseVersion,
onCreate: _onCreate);
}
//Creates the database
Future _onCreate(Database db, int version) async {
await db.execute(
'''
CREATE TABLE $tableName (
$databasecolumnId INTEGER PRIMARY KEY,
$databaseReading REAL NOT NULL,
$databaseDate INTERGER NOT NULL
)
'''
);
}
Future<int> insertReading(Reading reading) async {
Database db = await database;
int id = await db.insert(tableName, reading.toMap());
return id;
}
//gets reading
Future<Reading> queryReading(int id) async {
print("queryReading"); //gets here
Database db = await database;
print("Getting Db"); // not actually getting here
List<Map> maps = await db.query(tableName,
columns: [databasecolumnId, databaseReading, databaseDate],
where: '$databasecolumnId = ?',
whereArgs: [id]);
if (maps.length > 0) {
return Reading.fromMap(maps.first);
}
print('maps length : ${maps.length}');
return null;
}
}
Here is my Readings class:
class Reading {
int id;
double reading;
DateTime date;
//constructor
Reading({this.id, this.reading, this.date});
Map<String, dynamic> toMap() {
var map = <String, dynamic>{
databaseReading: reading,
databaseDate: date.millisecondsSinceEpoch,
};
if (id != null) {
map[databasecolumnId] = id;
}
return map;
}
//extracts a node object from the map obect
Reading.fromMap(Map<String, dynamic> map) {
id = map[databasecolumnId];
reading = map[databaseReading];
date = new DateTime.fromMillisecondsSinceEpoch(map [databaseDate]);
}
}

Answer 1

Turns out there was a deadlock in getting the database. By putting a lock on it it worked.
Here is the code to resolve it:
///declreation of the database
Database _database;
///Gets the database ensuring that there are no locks currently on the database
Future<Database> get database async {
if (_database != null) return _database;
_database = await _initDatabase();
return _database;
}