我正在尝试从Firestore获取数据,在调试打印中,将来它会工作,list获得数据,而在debugPrint长度是+,但是当我试图在另一个Widget列表中获取数据时,debugPrint长度是0。
model.dart
class BBModel extends Model {
int _counter = 10;
int get counter => _counter;
var db = dbBB;
List<BB> _bbs;
List<BB> get bbs => _bbs;
Future<List<
我有两张桌子。一个是会员信息,另一个是董事会信息。我想用名字显示“作者”和“查看者”,但我只能在“左联接”中显示其中一个
SELECT * FROM `table_a`
idx name
1 Admin
2 Superman
3 Ironman
4 Batman
SELECT * FROM `table_bbs`
idx writer title viewer
1 1 Hi All 0
2 1 hello 2
3 2 My name
grant all privileges on 'bbs' to 'userone'@'localhost' IDENTIFIED BY PASSWORD 'user2012';
它显示了ERROR 1064 (42000): You have an error in your SQL syntax; check the manual
我想添加一个用户userone并授予数据库bbs的所有权限。如何纠正它?
我试图在另一个子例程中调用一个子例程,并希望返回一些值。但是,它似乎没有返回任何值。我怎么把它写成函数呢?守则如下:
Sub tickersymbolchange()
Dim RSTA_ISIN, RSTA_Currency, RSTA_Ticker As String
For Each rng In r
ticker_wo_equity = Replace(rng.Value, " Equity", "")
Exchangecode = Right(ticker_wo_equity, 2)
Sel