无法在assets文件夹中创建.db文件

Question

我试图在assets文件夹中创建一个quizz.db文件，首先在数据文件夹中创建一个临时quizz.db，然后在其中创建表，然后将其复制到assets文件夹。通过调试代码，它显示该文件夹已创建。但我在资产文件夹中找不到它。这是代码，

#include <bb/cascades/Application>
#include <bb/cascades/QmlDocument>
#include <bb/cascades/AbstractPane>
#include <bb/data/SqlDataAccess>

using namespace bb::cascades;
using namespace bb::data;

SQLTest::SQLTest(bb::cascades::Application *app): QObject(app)
{
const QString fileName = QString("quizz.db");
QString dataFolder = QDir::homePath();
QString newFileName = dataFolder + "/" + fileName;
QTemporaryFile file(newFileName);

// Open the file that was created
if (file.open())
{
    // Create an SqlDataAccess object
    SqlDataAccess sda(newFileName);

    // Create a table called Employee in the database file
    sda.execute("CREATE TABLE Employee( firstName VARCHAR(50),lastName VARCHAR(50), salary INT);");

    // Insert employee records into the table
    sda.execute("INSERT INTO Employee (firstName, lastName, salary) VALUES (\"Mike\", \"Chepesky\", 42000);");
    sda.execute("INSERT INTO Employee (firstName, lastName, salary) VALUES (\"Westlee\", \"Barichak\", 55000);");
    sda.execute("INSERT INTO Employee (firstName, lastName, salary) VALUES (\"Ian\", \"Dundas\", 47000);");
    if(sda.hasError())
    {

    }
    else
        copyFileToAssetsFolder("quizz.db");
}
}

void SQLTest::copyFileToAssetsFolder(const QString fileName)
{
QString appFolder(QDir::homePath());
appFolder.chop(4);
QString originalFileName = appFolder + "app/native/assets/" + fileName;
QFile newFile(originalFileName);
// If I enable this `if` condition the code satisfies it and removes the quizz.db file and then it satisfies the next `if` condition and successfully copies the quizz.db file from `data` folder to `assets` folder.
/*if(newFile.exists())
    QDir().remove(originalFileName);*/
// this `if` condition is not satisfied. Which should mean the quizz.db file has been created on assets folder.
if (!newFile.exists())
{
    // If the file is not already in the assets folder, we copy it from the
    // data folder (read and write) to the assets folder (read only).
    QString dataFolder = QDir::homePath();
    QString newFileName = dataFolder + "/" + fileName;
    QFile originalFile(newFileName);

    if (originalFile.exists())
    {
        // Create sub folders if any creates the SQL folder for a file path like e.g. sql/quotesdb
        QFileInfo fileInfo(originalFileName);
        QDir().mkpath (fileInfo.dir().path());

        if(!originalFile.copy(originalFileName)) {
            qDebug() << "Failed to copy file to path: " << originalFileName;
        }
    } else {
        qDebug() << "Failed to copy file data base file does not exists.";
    }
}

// mSourceInDataFolder = newFileName;
}

如果我启用if函数的注释copyFileToAssetsFolder条件，它会删除资产文件夹中已创建的quizz.db文件（我无法找到）并进入下一个if条件并将data文件夹中创建的quizz.db复制到资产fodler。但无论如何我找不到assets文件夹中的quizz.db。我很快就需要帮助。感谢。

Answer 1

资产中的文件无法修改

Answer 2

似乎无法修改here中提到的资产文件夹现在我正在数据文件夹中创建我的db文件，因为它是可写的。