MySQL Database Connection Problem on Linux
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Hi All,
I'm using ubuntu 11.04 for Qt development. I've MySQL installed on my system and it contains a db named "test" which also has a table inside it.
@napster@panther ~ $ mysql --version
mysql Ver 14.14 Distrib 5.1.54, for debian-linux-gnu (i686) using readline 6.2@I've created a simple database application based on a video tutorial, and the code is shown below.
@#include <QtCore/QCoreApplication>
#include <QtSql>
#include <QtDebug>
int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);
QString servername = "localhost";
QString dbname = "test";
QString username = "root";
QString password = "toor";
QString dsn = QString("Server=%1;Database=%2;Uid=%3;Pwd=%4;").arg(servername,dbname,username,password);
QSqlDatabase db = QSqlDatabase::addDatabase("QMYSQL");
db.setConnectOptions();
db.setDatabaseName(dsn);
if(db.open()) {
qDebug() << "Opened!";
db.close();
}
else {
qDebug() << "Something went Wrong:" << db.lastError().text();
}
return a.exec();
}@I've also added a reference for the SQL usage to the project file.
@QT += sql@
But, when I run this application, I get the following error.
@Something went Wrong: "Access denied for user 'napster'@'localhost' (using password: NO) QMYSQL: Unable to connect" @
I've have double checked the all of the connection string variables and tried using both QMYSQL driver and QMYSQL3 driver. Also, the connection string is crafted from "here":http://www.connectionstrings.com/mysql. Can someone help me to find out what is wrong?
Thanks
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i see
'napster'@'localhost' (using password: NO) while you have already given a password!It seems there's a problem with your connection string. why don't you try simple connection options?
@db.setHostName("localhost");
db.setDatabaseName("test");
db.setUserName("root");
db.setPassword(rootPw);@ -
Hi mohsen,
Actually, I used that complex method of opening a db by following a video tutorial "here":http://www.youtube.com/watch?v=3XE2bKUAxfw. But, as you suggested, I've tried the simple connection options like your code, and it worked fine! Here is the complete code for my application.
@#include <QtCore/QCoreApplication>
#include <QtSql>
#include <QtDebug>
int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);
QSqlDatabase db = QSqlDatabase::addDatabase("QMYSQL3");
db.setConnectOptions();
db.setHostName("localhost");
db.setDatabaseName("test");
db.setUserName("root");
db.setPassword("toor");
if(db.open()) {
qDebug() << "Opened!";
db.close();
}
else {
qDebug() << "Something went Wrong:" << db.lastError().text();
}
return a.exec();
}@Thanks a lot mohsen!