flutter

Question

类型 'QueryRow' 不是类型 'String' 的子类型当我从 sqflite 检索数据时，我想将它添加到 widget

Future<List> getSpecificForm({String tableName, formId}) async { 
  final db = await database; 
  final List<Map<String, dynamic>> result = await db.rawQuery( 'SELECT * FROM $tableName WHERE id=? ORDER BY id DESC', [formId]); 
  return result; 
}

Answer 1

最后，我把函数改成这样：

Future<List> getSpecificForm({String tableName, formId}) async {
    final db = await database;
    final List<Map<String, dynamic>> result =  await db.rawQuery('SELECT * FROM $tableName WHERE id=?', [formId]);

    return List<Map<String, dynamic>>.generate(
        result.length, (index) => Map<String, dynamic>.from(result[index]),
        growable: true
    );
}

并且 returned 列表的 return 元素类型是 _InternalLinkedHashMap<String, dynamic>

flutter - 类型 'QueryRow' 不是类型 'String' 的子类型

flutter - type 'QueryRow' is not a subtype of type 'String'

dart

sqflite