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// Update the given Dog.
await db.update(
'dogs',
dog.toMap(),
// Ensure that the Dog has a matching id.
where: 'id = ?',
// Pass the Dog's id as a whereArg to prevent SQL injection.
whereArgs: [dog.id],
);
}
Future<void> deleteDog(int id) async {
// Get a reference to the database.
final db = await database;
// Remove the Dog from the database.
await db.delete(
'dogs',
// Use a `where` clause to delete a specific dog.
where: 'id = ?',
// Pass the Dog's id as a whereArg to prevent SQL injection.
whereArgs: [id],
);
}
// Create a Dog and add it to the dogs table
var fido = Dog(
id: 0,
name: 'Fido',
age: 35,
);
await insertDog(fido);
// Now, use the method above to retrieve all the dogs.
print(await dogs()); // Prints a list that include Fido.
// Update Fido's age and save it to the database.
fido = Dog(
id: fido.id,
name: fido.name,
age: fido.age + 7,
);
await updateDog(fido);
// Print the updated results.
print(await dogs()); // Prints Fido with age 42.
// Delete Fido from the database.
await deleteDog(fido.id);
// Print the list of dogs (empty).
print(await dogs());
}
class Dog {
final int id;
final String name;
final int age;
Dog({
required this.id,
required this.name,
required this.age,
});
// Convert a Dog into a Map. The keys must correspond to the names of the
// columns in the database.
Map<String, Object?> toMap() {
return {
'id': id,
'name': name,
'age': age,
};
}
// Implement toString to make it easier to see information about
// each dog when using the print statement.
@override
String toString() {
return 'Dog{id: $id, name: $name, age: $age}';
}
}<code_end>
<topic_end>
<topic_start>Firebase
<topic_end>
<topic_start>
Introduction
Firebase is a Backend-as-a-Service (BaaS) app development platform
that provides hosted backend services such as a realtime database,
cloud storage, authentication, crash reporting, machine learning,
remote configuration, and hosting for your static files.<topic_end>
<topic_start>
Flutter and Firebase resources
Firebase supports Flutter. To learn more,
check out the following resources.<topic_end>
<topic_start>
Documentation
<topic_end>
<topic_start>
Blog Posts
Use Firebase to host your Flutter app on the web<topic_end>
<topic_start>
Tutorials
Get to know Firebase for Flutter<topic_end>
<topic_start>
Flutter and Firebase community resources
The Flutter community created the following useful resources.<topic_end>
<topic_start>
Blog Posts
Building chat app with Flutter and Firebase<topic_end>
<topic_start>
Videos