我正在快速创建数据库,而在不知不觉中将active
添加到程序中。编译器现在显示“ Future not a type”,下面有红线。这是ref的代码:
~/.dartServer/.analysis-driver/
有人可以帮助删除import 'package:sqflite/sqflite.dart';
import 'package:path_provider/path_provider.dart';
import 'package:path/path.dart';
import 'dart:io';
class Db_Help{
static final _db_name="Work_tasks.db";
static final _db_version=1;
static final table="Work Table";
static final task_id="ID";
static final task="Task";
static final bool_check="Value";
static Database _database;
Db_Help._private_cons();
static final Db_Help instance=Db_Help._private_cons();
_initDatabase() async{
Directory docu_dir=await getApplicationDocumentsDirectory();
String path=join(docu_dir.path,_db_name);
return await openDatabase(path, version: _db_version, onCreate: _onCreate);
}
Future<Database> get database async{
if(_database!=null)
return _database;
_database=await _initDatabase();
return _database;
}
Future _onCreate(Database db, int version) async{
await db.execute('''
CREATE TABLE $table (
$task_id INTEGER PRIMARY KEY,
$task TEXT NOT NULL,
$bool_check INTEGER)
''');
}
Future<int> insert(Map<String,dynamic> row) async{
Database db= await instance.database;
return await db.insert(table, row);
}
}
(这可能是根本原因)吗?
我不知道该如何删除。
预先感谢:)
答案 0 :(得分:1)
您需要更改onCreate函数的返回类型。应该是空的,而不是未来。
void _onCreate(Database db, int version) async{
await db.execute('''
CREATE TABLE $table (
$task_id INTEGER PRIMARY KEY,
$task TEXT NOT NULL,
$bool_check INTEGER)
''');
}