flutter-类型＆＃x27; queryrow＆＃x27;不是类型的子类型＆＃x27; string＆＃x27;

发布于 2025-01-18 18:38:47 字数 355 浏览 0 评论 0原文

类型“QueryRow”不是类型“String”的子类型当我从 sqflite 检索数据时，我想将其添加到小部件

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; 
}

原文

type 'QueryRow' is not a subtype of type 'String'
when I retrieved data from sqflite, and I want to add it to 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; 
}

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眼中杀气 2025-01-25 18:38:47

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
    );
}

返回列表元素的返回类型为_InternalLinkedHashMap

Finally, I changed the function like this:

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
    );
}

and the return type of elements of the returned list is _InternalLinkedHashMap<String, dynamic>

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