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();
}