Qt数据库sqlite

　　支持多种数据库，但大多都需要装驱动。qDebug() << QSqlDatabase::drivers();

    //添加数据库
    QSqlDatabase db=QSqlDatabase::addDatabase("QSQLITE");
    //连接数据
    db.setDatabaseName("../debug/Student"); //设定将要使用的数据库的名字
    //打开数据库
    if(!db.open())
    {
        QMessageBox::warning(this, "错误", db.lastError().text());
        return ;//打开失败
    }
    QSqlQuery query;
    query.exec("CREATE TABLE IF NOT EXISTS  people (id INTEGER PRIMARY KEY AUTOINCREMENT,"
                                       "name VARCHAR(20) NOT NULL,"
                                       "age INTEGER NULL)");
//    for (int i = 0; i< 3; ++i)
//    {
//        query.prepare("INSERT INTO people (id, name, age) VALUES (:id, :name, :age)");
//        query.bindValue(":name", QString("smith_%1").arg(i+1));
//        query.bindValue(":age", 20+i*5);
//        query.exec();
//    }
    if (query.exec("insert into people(id, name, age) values(2, 'lucy', 22);"))
    {
        qDebug()<<"insert success/n";
    }
    else{
        qDebug()<<"insert failed";
    }
    query.exec("SELECT id, name, age FROM people");
    while (query.next())//执行查找语句的结果
    {
        qDebug()<<"people:"<<query.value(0).toInt()<<"    name:"<<query.value(1).toString()<<"  age:"<<query.value(2).toInt();
    }
    db.close();