QSqlDatabase操作数据库sqlite3

static const char* DBName = "./test.db";
    QFileInfo file(DBName);
    if(file.exists() == false)
    {
        QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE");
        db.setDatabaseName(DBName); //设置数据库名

        if (!db.open())
        {
            qDebug("数据库不能打开");
            return -1;
        }

        QSqlQuery query;
        ///创建卡号数据库
        query.exec("CREATE TABLE tb_card(cardNum varchar(64) PRIMARY KEY, name varchar(64), job varchar(64))");
        query.clear();
     }

QSqlQuery query(dbConn);
    QString sqlStr;
    sqlStr.append("select * from tb_card");
    bool isSuccess = query.exec(sqlStr);

    QString cardNum, name, job;
    int i = 0;
    while(query.next()) //query.next()指向查找到的第一条记录，然后每次后移一条记录
    {
        cardNum.clear();
        name.clear();
        job.clear();
        cardNum.append(query.value(0).toString());
        name.append(query.value(1).toString());
        job.append(query.value(2).toString());
    }

QT       += core gui sql