delete query in sqlite flutter

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Arianna
25 Jun 2018
1// Get a location using getDatabasesPath
2var databasesPath = await getDatabasesPath();
3String path = join(databasesPath, 'demo.db');
4
5// Delete the database
6await deleteDatabase(path);
7
8// open the database
9Database database = await openDatabase(path, version: 1,
10    onCreate: (Database db, int version) async {
11  // When creating the db, create the table
12  await db.execute(
13      'CREATE TABLE Test (id INTEGER PRIMARY KEY, name TEXT, value INTEGER, num REAL)');
14});
15
16// Insert some records in a transaction
17await database.transaction((txn) async {
18  int id1 = await txn.rawInsert(
19      'INSERT INTO Test(name, value, num) VALUES("some name", 1234, 456.789)');
20  print('inserted1: $id1');
21  int id2 = await txn.rawInsert(
22      'INSERT INTO Test(name, value, num) VALUES(?, ?, ?)',
23      ['another name', 12345678, 3.1416]);
24  print('inserted2: $id2');
25});
26
27// Update some record
28int count = await database.rawUpdate(
29    'UPDATE Test SET name = ?, value = ? WHERE name = ?',
30    ['updated name', '9876', 'some name']);
31print('updated: $count');
32
33// Get the records
34List<Map> list = await database.rawQuery('SELECT * FROM Test');
35List<Map> expectedList = [
36  {'name': 'updated name', 'id': 1, 'value': 9876, 'num': 456.789},
37  {'name': 'another name', 'id': 2, 'value': 12345678, 'num': 3.1416}
38];
39print(list);
40print(expectedList);
41assert(const DeepCollectionEquality().equals(list, expectedList));
42
43// Count the records
44count = Sqflite
45    .firstIntValue(await database.rawQuery('SELECT COUNT(*) FROM Test'));
46assert(count == 2);
47
48// Delete a record
49count = await database
50    .rawDelete('DELETE FROM Test WHERE name = ?', ['another name']);
51assert(count == 1);
52
53// Close the database
54await database.close();
55
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