C++ SQLite 记录未更新

Question

我的C++ 应用程序中有一个SQLite 数据库设置，

Database::Database()
{
    /* Create SQL statement */
    std::string sample = "CREATE TABLE IF NOT EXISTS SAMPLES("
        "FAVORITE       INT     NOT NULL,"
        "FILENAME       TEXT    NOT NULL,"
        "SAMPLEPACK     TEXT    NOT NULL,"
        "CHANNELS       INT     NOT NULL,"
        "LENGTH         INT     NOT NULL,"
        "SAMPLERATE     INT     NOT NULL,"
        "BITRATE        INT     NOT NULL,"
        "BITSPERSAMPLE  INT     NOT NULL,"
        "PATH           TEXT    NOT NULL,"
        "TYPE           TEXT    NOT NULL);";

    try
    {
        rc = sqlite3_open("Samples.db", &DB);
        rc = sqlite3_exec(DB, sample.c_str(), NULL, 0, &ErrorMessage);

        if (rc != SQLITE_OK)
        {
            msgDialog = new wxMessageDialog(NULL, "Error! Cannot create table.", "Error", wxOK | wxICON_ERROR);
            msgDialog->ShowModal();
            sqlite3_free(ErrorMessage);
        }
        else
        {
            wxLogDebug("Table created successfully.");
        }

        sqlite3_close(DB);
    }
    catch (const std::exception &exception)
    {
        wxLogDebug(exception.what());
    }
}

我有一个向其中插入数据的函数，

void Database::InsertSample(int Favorite, std::string Filename,
                            std::string SamplePack, int Channels, int Length,
                            int SampleRate, int Bitrate, std::string Comment,
                            std::string Path, std::string Type)
{
    try
    {
        rc = sqlite3_open("Samples.db", &DB);

        std::string insert = "INSERT INTO SAMPLES (FAVORITE, FILENAME, SAMPLEPACK, CHANNELS, \
                              LENGTH, SAMPLERATE, BITRATE, BITSPERSAMPLE, PATH, TYPE) \
                              VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?);";

        rc = sqlite3_prepare_v2(DB, insert.c_str(), insert.size(), &stmt, NULL);

        rc = sqlite3_bind_int(stmt, 1, Favorite);
        rc = sqlite3_bind_text(stmt, 2, Filename.c_str(), Filename.size(), SQLITE_STATIC);
        rc = sqlite3_bind_text(stmt, 3, SamplePack.c_str(), SamplePack.size(), SQLITE_STATIC);
        rc = sqlite3_bind_int(stmt, 4, Channels);
        rc = sqlite3_bind_int(stmt, 5, Length);
        rc = sqlite3_bind_int(stmt, 6, SampleRate);
        rc = sqlite3_bind_int(stmt, 7, Bitrate);
        rc = sqlite3_bind_text(stmt, 8, Comment.c_str(), Comment.size(), SQLITE_STATIC);
        rc = sqlite3_bind_text(stmt, 9, Path.c_str(), Path.size(), SQLITE_STATIC);
        rc = sqlite3_bind_text(stmt, 10, Type.c_str(), Type.size(), SQLITE_STATIC);

        if (sqlite3_step(stmt) != SQLITE_DONE)
        {
            wxLogWarning("No data inserted.");
        }

        rc = sqlite3_finalize(stmt);

        if (rc != SQLITE_OK)
        {
            msgDialog = new wxMessageDialog(NULL, "Error! Cannot insert data into table.", "Error", wxOK | wxICON_ERROR);
            msgDialog->ShowModal();
            sqlite3_free(ErrorMessage);
        }
        else
        {
            wxLogInfo("Data inserted successfully. %s", ErrorMessage);
        }

        sqlite3_close(DB);
    }
    catch (const std::exception &exception)
    {
        wxLogDebug(exception.what());
    }
}

我这样称呼它，

            db.InsertSample(0, Filename.ToStdString(), Artist.to8Bit(true),
                            Channels, Length, SampleRate, Bitrate,
                            Comment.to8Bit(true), Path.ToStdString(), "Sample");

数据库工作正常，我还有其他删除和删除功能。但是今天我给它加了一列TYPE，并在里面插入了"Sample"，只是为了测试，还有这样的更新功能，

void Database::UpdateSampleType(std::string& filename, std::string type)
{
    try
    {
        rc = sqlite3_open("Samples.db", &DB);

        std::string select = "UPDATE SAMPLES SET TYPE = ? WHERE FILENAME = ?;";

        rc = sqlite3_prepare_v2(DB, select.c_str(), select.size(), &stmt, NULL);

        rc = sqlite3_bind_text(stmt, 1, type.c_str(), type.size(), SQLITE_STATIC);
        rc = sqlite3_bind_text(stmt, 2, filename.c_str(), filename.size(), SQLITE_STATIC);

        if (sqlite3_step(stmt) == SQLITE_ROW)
        {
            wxLogDebug("Record found, updating..");
        }

        rc = sqlite3_finalize(stmt);

        if (rc != SQLITE_OK)
        {
            msgDialog = new wxMessageDialog(NULL, "Error! Cannot update record.", "Error", wxOK | wxICON_ERROR);
            msgDialog->ShowModal();
            sqlite3_free(ErrorMessage);
        }
        else
        {
            wxLogDebug("Updated record successfully.");
        }

        sqlite3_close(DB);
    }
    catch (const std::exception &exception)
    {
        wxLogDebug(exception.what());
    }
}

我得到的输出为Updated record successfully，但如果我尝试在sqlitebrowser 中打开数据库，它仍然显示为Sample。

Answer 1

我发现了问题，我将路径作为参数传递，我在其中调用 UpdateSampleType() 而不是文件名。它现在可以工作了。