qt连接数据库Sqlite

#include <QCoreApplication>
#include <QDebug>
#include <QSqlDatabase>
#include <QSqlQuery>
int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);
    QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE");
    db.setDatabaseName("student.db");
    if(!db.open())
    {
        qDebug() << "open err";
    }
    else
    {
        qDebug() << "database is ok";
    }
    QSqlQuery query(db);
    bool isok = query.exec("create table stud(id int primary key,name varchar(20))");
    query.exec("insert into stud values(111,‘liming‘)");
    query.exec("insert into stud values(102,‘li‘)");
    query.exec("insert into stud values(103,‘lisi‘)");
    query.exec("insert into stud values(105,‘zhangsan‘)");

    if(!isok)
    {
        qDebug() << "table err";
    }
    else
    {
        qDebug() << "table is ok";
    }

    query.exec("select * from stud");
    while(query.next())
    {
        qDebug() << "id:"<<query.value(0).toInt()<<"name:"<<query.value(1).toString();
    }
    return a.exec();
}