QSqlQuery problem

[MarkoSan]

Hi, I have the code:

QString CMerchandizeBrowser::getMerchandizeName(QString strPicPath)
{
    Q_ASSERT(strPicPath.size()>0);    // assertion test
    // use query
/*
    QSqlQuery useQuery("USE merchandize;");
    qDebug() << useQuery.lastError();    // debug
*/
    // query string;
    QString queryString("SELECT * FROM `eros`.`merchandize` WHERE PicPath=\"%1\";");
    queryString=queryString.arg(strPicPath);
    qDebug() << "queryString:" << queryString;    // debug
    QSqlQuery query(queryString);    // executes sql query
    //Q_ASSERT(query.value(iMerchandizeFieldNAME).toString().size()>0);    // assertion test
    qDebug() << query.lastError();    // debug: shows error
    qDebug() << query.value(iMerchandizeFieldNAME).toString();    // debug
    return(query.value(iMerchandizeFieldNAME).toString());    // returns merchandize name
}

QString CMerchandizeBrowser::getMerchandizeName(QString strPicPath)
{
    Q_ASSERT(strPicPath.size()>0);    // assertion test
    // use query
/*
    QSqlQuery useQuery("USE merchandize;");
    qDebug() << useQuery.lastError();    // debug
*/
    // query string;
    QString queryString("SELECT * FROM `eros`.`merchandize` WHERE PicPath=\"%1\";");
    queryString=queryString.arg(strPicPath);
    qDebug() << "queryString:" << queryString;    // debug
    QSqlQuery query(queryString);    // executes sql query
    //Q_ASSERT(query.value(iMerchandizeFieldNAME).toString().size()>0);    // assertion test
    qDebug() << query.lastError();    // debug: shows error
    qDebug() << query.value(iMerchandizeFieldNAME).toString();    // debug
    return(query.value(iMerchandizeFieldNAME).toString());    // returns merchandize name
}

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and after qDebug() << query.lastError() I get:

warning: QSqlError(-1, "", "")

warning: QSqlError(-1, "", "")

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The connection to database is ok, I've double checked. What is wrong, please help!