How do I resolve a Sqlite Error (1) in Flutter? - flutter

Question

Im new to flutter and first time to work with sqlite database.
I have created a todo app that is linked to a Sqlite database. It has simple cards that i can add and it works fine. The problem is, I have a delete icon, but for some reason the cards do not delete when I press the delete icon. I get the following error message in the stack:
E/SQLiteLog(22653): (1) no such table: çustomerblueprint in "DELETE FROM çustomerblueprint WHERE id == ?"
E/flutter (22653): [ERROR:flutter/lib/ui/ui_dart_state.cc(209)] Unhandled Exception: DatabaseException(no such table: çustomerblueprint (code 1 SQLITE_ERROR[1]): , while compiling: DELETE FROM çustomerblueprint WHERE id == ?) sql 'DELETE FROM çustomerblueprint WHERE id == ?' args [1]
I have read for hours to try and fine a solution, but don't seem to get this one.
My code is:
Database Code
class CustomerBluePrint {
int? id;
final String title;
DateTime creationDate;
bool isChecked;
CustomerBluePrint({
this.id,
required this.title,
required this.creationDate,
required this.isChecked,
});
Map<String, dynamic> toMap() {
return {
'id': id,
'title': title,
'creationDate': creationDate.toString(),
'isChecked': isChecked ? 1 : 0,
};
}
#override
String toString() {
return 'CustomerBluePrint(id : $id, title : $title, creationDate : $creationDate, isChecked
: $isChecked )'; // , phone : $phone, mobile : $mobile, fax : $fax, email : $email, name :
$name)';
}
}
class DatabaseConnect {
Database? _database;
Future<Database> get database async {
final dbpath = await getDatabasesPath();
const dbname = 'customerblueprint.db';
final path = join(dbpath, dbname);
_database = await openDatabase(path, version: 1, onCreate: _createDB);
return _database!;
}
Future<void> _createDB(Database db, int version) async {
await db.execute('''
CREATE TABLE todo(
id INTEGER PRIMARY KEY AUTOINCREMENT,
title TEXT,
creationDate TEXT,
isChecked INTEGER
)
''');
}
Future<void> insertCustomerBluePrint(
CustomerBluePrint customerblueprint) async {
final db = await database;
await db.insert(
'customerblueprint',
customerblueprint.toMap(),
conflictAlgorithm: ConflictAlgorithm.replace,
);
}
Future<void> deleteCustomerBluePrint(
CustomerBluePrint customerblueprint) async {
final db = await database;
await db.delete(
'çustomerblueprint',
where: 'id == ?',
whereArgs: [customerblueprint.id],
);
}
Future<List<CustomerBluePrint>> getCustomerBluePrint() async {
final db = await database;
List<Map<String, dynamic>> items = await db.query(
'customerblueprint',
orderBy: 'id DESC',
);
return List.generate(
items.length,
(i) => CustomerBluePrint(
id: items[i]['id'],
title: items[i]['title'],
creationDate: DateTime.parse(items[i]['creationDate']),
isChecked: items[i]['isChecked'] == 1 ? true : false,
),
);
}
}
Customer List Code
import 'package:flutter/material.dart';
import 'library.dart';
import 'customer_card.dart';
class CustomerList extends StatelessWidget {
final Function insertFunction;
final Function deleteFunction;
final db = DatabaseConnect();
CustomerList(
{required this.insertFunction, required this.deleteFunction, Key? key})
: super(key: key);
#override
Widget build(BuildContext context) {
return Expanded(
child: FutureBuilder(
future: db.getCustomerBluePrint(),
initialData: const [],
builder: (BuildContext context, AsyncSnapshot<List> snapshot) {
var data = snapshot.data;
var datalength = data!.length;
return datalength == 0
? const Center(
child: Text('no data found'),
)
: ListView.builder(
itemCount: datalength,
itemBuilder: (context, i) => CustomerCard(
id: data[i].id,
title: data[i].title,
creationDate: data[i].creationDate,
isChecked: data[i].isChecked,
insertFunction: insertFunction,
deleteFunction: deleteFunction,
),
);
},
),
);
}
}
Customer Card Code
import 'package:flutter/material.dart';
import 'package:intl/intl.dart';
import 'library.dart';
class CustomerCard extends StatefulWidget {
final int id;
final String title;
final DateTime creationDate;
bool isChecked;
final Function insertFunction;
final Function deleteFunction;
CustomerCard(
{required this.id,
required this.title,
required this.creationDate,
required this.isChecked,
required this.insertFunction,
required this.deleteFunction,
Key? key})
: super(key: key);
#override
_CustomerCardState createState() => _CustomerCardState();
}
class _CustomerCardState extends State<CustomerCard> {
#override
Widget build(BuildContext context) {
var anotherCustomerBluePrint = CustomerBluePrint(
id: widget.id,
title: widget.title,
creationDate: widget.creationDate,
isChecked: widget.isChecked);
return Card(
child: Row(
children: [
Container(
margin: const EdgeInsets.symmetric(horizontal: 15, vertical: 10),
child: Checkbox(
value: widget.isChecked,
onChanged: (bool? value) {
setState(() {
widget.isChecked = value!;
});
anotherCustomerBluePrint.isChecked = value!;
widget.insertFunction(anotherCustomerBluePrint);
},
),
),
Expanded(
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Text(
widget.title,
style: const TextStyle(
fontWeight: FontWeight.bold,
fontSize: 18,
),
),
const SizedBox(height: 5),
Text(
DateFormat('dd MMM yyyy - hh:mm aaa')
.format(widget.creationDate),
style: const TextStyle(
fontSize: 16,
fontWeight: FontWeight.bold,
color: Color(0xFF8F8F8F),
),
)
],
),
),
IconButton(
onPressed: () {
widget.deleteFunction(anotherCustomerBluePrint);
},
icon: const Icon(Icons.close),
),
],
),
);
}
}
Customer Code
This is my Homepage
import 'package:flutter/material.dart';
import 'package:flutter/cupertino.dart';
import 'package:invoice_app/customer_profile.dart';
import 'customer_list.dart';
import 'library.dart';
class Customer extends StatefulWidget {
const Customer({Key? key}) : super(key: key);
#override
_CustomerState createState() => _CustomerState();
}
class _CustomerState extends State<Customer> {
var db = DatabaseConnect();
void addItem(CustomerBluePrint customerblueprint) async {
await db.insertCustomerBluePrint(customerblueprint);
setState(() {});
}
void deleteItem(CustomerBluePrint customerblueprint) async {
await db.deleteCustomerBluePrint(customerblueprint);
setState(() {
});
}
#override
Widget build(BuildContext context) {
return Scaffold(
backgroundColor: const Color(0xFFF5EBFF),
body: Column(
children: [
CustomerList(
insertFunction: addItem, deleteFunction: deleteItem),
CustomerProfile(
insertFunction: addItem
),
],
),
);
}
The deletefunction is suppose to delete an entry based on the 'id'assigned to it. Everything works fine, except I cannot delete a card (entry) as it throws the error.
Please help. Would really appreciate it.

Answer 1

Found your mistake take a look at Database Code and implementation of the method Future<void> deleteCustomerBluePrint(CustomerBluePrint customerblueprint) You have an error there. Your:
await db.delete(
'çustomerblueprint',
where: 'id == ?',
whereArgs: [customerblueprint.id],
);
Mine Repaired:
await db.delete(
'customerblueprint',
where: 'id == ?',
whereArgs: [customerblueprint.id],
);
An error in the word customerblueprint, you do not have the letter "c" there, you have some other sign.