用如下代码测试连接数据库

用如下代码测试连接数据库并测试写入、读出数据是否成功，并测试数据是否乱码。

#include

#include

#include

#include

#include

int main(int argc, char **argv)

{

         QApplication app(argc, argv);

         QTextCodec::setCodecForTr(QTextCodec::codecForName("gbk")); //设置tr()编码。

         QSqlQueryModel *model;

         QTableView *table=new QTableView;

         QSqlDatabase db = QSqlDatabase::addDatabase("QMYSQL");

         db.setHostName("localhost");   //数据库服务器

         db.setDatabaseName("test");   //数据库名

         db.setUserName("root");      //登录名

         db.setPassword("123456");    //密码

         if(db.open())

         {

                   QMessageBox::information(0,QObject::tr("信息"),

QObject::tr("数据库连接成功"));

                   QSqlQuery query;

                   query.exec(QObject::tr("INSERT INTO bbb VALUES ('柯南')"));

query.exec("SELECT name FROM testTable");//name为属性名；

                                                                                             //testTable为表名

                   model=new QSqlQueryModel;

                   model->setQuery(query);

                   model->setHeaderData(0, Qt::Horizontal, QObject::tr("姓名"));

                   table->setModel(model);

                   table->show();

         }

         else

         {

                   // 数据库打开失败，显示数据库返回的失败信息

                   QMessageBox::critical(0,QObject::tr("出错"),db.lastError().text());

         }

         QApplication::connect(&app, SIGNAL(lastWindowClose()), &app, SLOT(quit()));

         return app.exec();

}

运行结果如下图：