How to get SQFlite data date wise in flutter? - flutter

Question

I'm creating todo app in flutter. And I need to show Todos date wise. Like all Todos created today should shown under Today, all the tomorrow's Todos should shown under Tomorrow.
I have created my table like this:
database.execute("""
CREATE TABLE Todotable(
id INTEGER PRIMARY KEY AUTOINCREMENT,
taskName TEXT NOT NULL,
taskTag TEXT NOT NULL,
date TEXT NOT NULL,
isReminder INTEGER NOT NULL,
isCompleted INTEGER NOT NULL
)
""");
I don't know how to query SQFlite data date wise and format it like Today and Tomorrow. And show in section like today and tomorrow as shown in design.
Thanks for answers:)

Answer 1

for getting todos for tomorrow
//for tomorrow
String tomorrowDate= DateTime.now().add(Duration(days: 1)).toIso8601String();
var todosForTomrrow= await database
.rawQuery('SELECT * FROM Todotable WHERE date = ?', [tomorrowDate]);
//for today
String todayDate= DateTime.now().toIso8601String();
var todosForToday= await database
.rawQuery('SELECT * FROM Todotable WHERE date = ?', [todayDate]);
Date is converted and saved here in string format and date should converted to same format before inserting into the table like this

Answer 2

You can create DATETIME columns in sqflite.
Here is an example for a Weather table created in a sqflite database:
batch.execute('''
CREATE TABLE $tableWeather (
$weatherLocalization TEXT NOT NULL,
$weatherDate DATETIME NOT NULL,
$weatherHumidityPercentage REAL,
$weatherWindDegree REAL,
$weatherWindSpeed REAL,
$weatherPressureHPascal INTEGER,
$weatherTemperatureCelsius REAL,
$weatherDescription TEXT,
$weatherIconId TEXT,
PRIMARY KEY($weatherLocalization, $weatherDate));
''',);
You can create a Weather object as follows:
class Weather{
String localization;
DateTime date;
double humidityPercentage;
double windDegree;
double windSpeedMS;
int pressureHPascal;
double temperatureCelsius;
String description;
String iconId;
Weather({
#required this.localization,
#required this.date,
this.humidityPercentage,
this.windDegree,
this.windSpeedMS,
this.pressureHPascal,
this.temperatureCelsius,
this.description,
this.iconId
});
//to be used when inserting a row in the table
Map<String, dynamic> toMap() {
final map = new Map<String, dynamic>();
map["$weatherLocalization"] = localization;
map["$weatherDate"] = date.toString();
map["$weatherHumidityPercentage"] = humidityPercentage;
map["$weatherWindDegree"] = windDegree;
map["$weatherWindSpeed"] = windSpeedMS;
map["$weatherPressureHPascal"] = pressureHPascal;
map["$weatherTemperatureCelsius"] = temperatureCelsius;
map["$weatherDescription"] = description;
map["$weatherIconId"] = iconId;
return map;
}
//to be used when converting the row into object
factory WeatherOnDate.fromMap(Map<String, dynamic> data) => new WeatherOnDate(
localization: data["$weatherLocalization"],
date: DateTime.parse(data["$weatherDate"]),
humidityPercentage: data["$weatherHumidityPercentage"],
windDegree: data["$weatherWindDegree"],
windSpeedMS: data["$weatherWindSpeed"],
pressureHPascal: data["$weatherPressureHPascal"],
temperatureCelsius: data["$weatherTemperatureCelsius"],
description: data["$weatherDescription"],
iconId: data["$weatherIconId"]
);
}
Be careful to transform your DateTime attribute to a String or int as I did in the toMap() function.
Then, when you want to fetch a date you can do this:
Future<Weather> fetchWeatherOnDate(DateTime dateTime) async {
DatabaseHelper _databaseHelper = Injection.injector.get();
List<Map<String, dynamic>> weatherMaps = await _databaseHelper.db.rawQuery(
'SELECT * FROM $tableWeather WHERE DATE($weatherDate) = DATE(?)',
[dateTime.toString()]);
List<Weather> weathers= [];
for (final weatherMap in weatherMaps) {
weathers.add(Weather.fromMap(weatherMap));
}
if (weathers.isNotEmpty){
return weathers[0];
}
return null;
}
DateTime today = DateTime.now()
Weather weatherToday = fetchWeatherOnDate(today);
I think that it gives you a good idea of how to solve your problem :)

Answer 3

DateTime is not supported in Flutter SQLite package.
Check the information about supported SQLite types:
https://pub.dev/packages/sqflite#supported-sqlite-types
DateTime is not a supported SQLite type. Personally I store them as int (millisSinceEpoch) or string (iso8601)
We can use String or int as suggested from the package developer.
To work with a conditional selection of items of day in DB, perhaps a String is more convenient.
Personally, I prefer user formatter to get the search keyword, as shown below:
DateFormat formater = DateFormat('yyyyMMdd');
var today = formater.format(DateTime.now());
var tomorrow = formater.format(DateTime.now().add(const Duration(days: 1)));
To search in DB, I'd use a method like below:
Future<TodoList?> getTodoListByDay(String day) async {
final db = await database;
String sql =
"SELECT * FROM Todotable WHERE date = \'${day}\' ";
var res = await db.rawQuery(sql);
List<TodoList> objs = res.isNotEmpty
? res.map((c) => TodoList.fromMap(c)).toList()
: [];
return objs.isNotEmpty ? objs : null;
}
TodoList class could be generate from json, as I do with 'jsonToDartModel' package.
import 'dart:convert';
class TodoList {
int? id;
String? taskName;
String? taskTag;
String? date;
int? isReminder;
int? isCompleted;
TodoList({
this.id,
this.taskName,
this.taskTag,
this.date,
this.isReminder,
this.isCompleted,
});
factory TodoList.fromMap(Map<String, dynamic> data) => TodoList(
id: data['id'] as int?,
taskName: data['taskName'] as String?,
taskTag: data['taskTag'] as String?,
date: data['date'] as String?,
isReminder: data['isReminder'] as int?,
isCompleted: data['isCompleted'] as int?,
);
Map<String, dynamic> toMap() => {
'id': id,
'taskName': taskName,
'taskTag': taskTag,
'date': date,
'isReminder': isReminder,
'isCompleted': isCompleted,
};
/// `dart:convert`
///
/// Parses the string and returns the resulting Json object as [TodoList].
factory TodoList.fromJson(String data) {
return TodoList.fromMap(json.decode(data) as Map<String, dynamic>);
}
/// `dart:convert`
///
/// Converts [TodoList] to a JSON string.
String toJson() => json.encode(toMap());
}