[solved] MYSQL plugin is installed, but I can't connect to local database

[Pavlon]

Hi!I need to connect with my Qt application to a MySql database.

So I compiled MySql plugin for Qt, and put result file (libqsqlmysql.so) into QT's plugins directory. It seems to work.

I installed Xampp to run a local Mysql database, and i created a database named "Test". It seems to work.

I modified the example project in QT, "Masterdetail (Music Archive) to connect with local database. I modified only the "database.h" file like this:

@
#ifndef DATABASE_H
#define DATABASE_H

#include <QMessageBox>
#include <QSqlDatabase>
#include <QSqlError>
#include <QSqlQuery>

static bool createConnection()
{
QSqlDatabase db = QSqlDatabase::addDatabase("QMYSQL");
db.setHostName("localhost");
db.setDatabaseName("Test");
db.setUserName("root");
db.setPassword("123456");

if (!db.open()) {

   qDebug() << db.lastError();
   QMessageBox::critical(0, qApp->tr("Cannot open database"),
        qApp->tr("ERROR!.\n"
                 "This example needs SQLite support. Please read "
                 "the Qt SQL driver documentation for information how "
                 "to build it.\n\n"
                 "Click Cancel to exit."), QMessageBox::Cancel);
    return false;
}

@

I receive this error:
QSqlError(2002, "QMYSQL: Unable to connect", "Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2)")

Where am I wrong?thanks

O.S Ubuntu 10
QT.Qt Creator 2.0.1
Based on Qt 4.7.0 (32 bit)

[goetz]

Is your mysqld actually running?

Can you connect on the command line? Check with

@
mysql -u root -p -h localhost Test
@

[Pavlon]

I found the solution here: "Your text to link here...":http://developer.qt.nokia.com/forums/viewthread/1228/P135

In particular, I didn't have this folder " /var/run/mysqld"

so i typed
@sudo mkdir /var/run/mysqld
@
and then
@
sudo ln -s /opt/lampp/var/mysql/mysql.sock /var/run/mysqld/mysqld.sock
@
As explained in post, and after this it worked!

Thanks Volker for reply. Your command returns this message:

@
Program "mysql" can be found in this packages:

• mysql-client-core-5.1
• mysql-cluster-client-5.1
  Try: sudo apt-get install <SELECTED PACKAGE>
  @