QT 读写sqllite数据库

#include <QtGui/QApplication>
#include "mainwindow.h"
#include "QTextCodec"
#include "QSqlDatabase"
#include "QSqlQuery"
#include "QVariant"
#include "QString"
#include "QMessageBox"

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    QTextCodec::setCodecForTr(QTextCodec::codecForName("utf8"));
    QTextCodec::setCodecForLocale(QTextCodec::codecForName("utf8"));
    QTextCodec::setCodecForCStrings(QTextCodec::codecForName("utf8"));

    MainWindow w;
    w.show();
   
    QSqlDatabase dbconn=QSqlDatabase::addDatabase("QSQLITE");    //添加数据库驱动
    dbconn.setDatabaseName("mytest.db");  //在工程目录新建一个mytest.db的文件
    if(!dbconn.open())
    {
        QMessageBox::information(NULL, "err", "no db");
    }
    QSqlQuery query;//以下执行相关QSL语句
    query.exec("create table student(id varchar,name varchar)");    //新建student表，id设置为主键，还有一个name项
    query.exec(QObject::tr("insert into student values(1,'第一个')"));
    query.exec(QObject::tr("insert into student values(2,'第二个')"));
    query.exec(QObject::tr("insert into student values(3,'Third')"));
    query.exec(QObject::tr("insert into student values(4,’Forth')"));
    query.exec(QObject::tr("insert into student values(5,'Fifth')"));
    query.exec(QObject::tr("insert into student values(6,'Sixth')"));
    query.exec("select id,name from student where id>=1");

    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
    {
        QString ele1=query.value(1).toString();
        QMessageBox::information(NULL, query.value(0).toString(), ele1);
    }
    query.exec(QObject::tr("drop student"));

    return a.exec();
}