扑动:sqflite 插入 return 类型
flutter: sqflite insert return type
与 sqflite 中的每个数据库操作一样,插入操作也将是一个
异步函数,它将 return 一个 int 类型的 Future,作为
insert 方法将 return 插入的记录的 ID,但在我的例子中它不会 return 记录它的 ID return 像这样 (Instance of 'Future<int>')
。我想打印我记录的实际数值id。
这是我插入数据的代码:
Future<int> insert_into_Account(Account account) async {
int id = await db.insert(
'account',
account.toMapAccount(),
conflictAlgorithm: ConflictAlgorithm.replace,
);
return id;
}
// print data
Future testDb() async {
db = await openDb();
var id = insert_into_Account(Account(
name: 'maliha',
adress: 'eeee',
balance: 123,
issueDate: '333',
telphone: 'ddd',
type: 'eee',
));
List lists = await db.rawQuery('select * from account');
print(lists[0].toString());
print(id.toString());
}
结果是:
I/flutter (11306): {accountNumber: 5, name: maliha, telphone: ddd, address: eeee, issueDate: 333, balance: 123, image: null, type: eee}
I/flutter (11306): Instance of 'Future<int>'
insert_into_Account
returnFuture<int>
。获取id,在前面加上await
:
var id = await insert_into_Account(Account(
name: 'maliha',
adress: 'eeee',
balance: 123,
issueDate: '333',
telphone: 'ddd',
type: 'eee',
));
与 sqflite 中的每个数据库操作一样,插入操作也将是一个
异步函数,它将 return 一个 int 类型的 Future,作为
insert 方法将 return 插入的记录的 ID,但在我的例子中它不会 return 记录它的 ID return 像这样 (Instance of 'Future<int>')
。我想打印我记录的实际数值id。
这是我插入数据的代码:
Future<int> insert_into_Account(Account account) async {
int id = await db.insert(
'account',
account.toMapAccount(),
conflictAlgorithm: ConflictAlgorithm.replace,
);
return id;
}
// print data
Future testDb() async {
db = await openDb();
var id = insert_into_Account(Account(
name: 'maliha',
adress: 'eeee',
balance: 123,
issueDate: '333',
telphone: 'ddd',
type: 'eee',
));
List lists = await db.rawQuery('select * from account');
print(lists[0].toString());
print(id.toString());
}
结果是:
I/flutter (11306): {accountNumber: 5, name: maliha, telphone: ddd, address: eeee, issueDate: 333, balance: 123, image: null, type: eee}
I/flutter (11306): Instance of 'Future<int>'
insert_into_Account
returnFuture<int>
。获取id,在前面加上await
:
var id = await insert_into_Account(Account(
name: 'maliha',
adress: 'eeee',
balance: 123,
issueDate: '333',
telphone: 'ddd',
type: 'eee',
));