Segmentation fault

[marcel]

Yes, but I was referring to the internal QSqlDatabase pointer. The one from MySqlConnect.

[MarkoSan]

Ok, just a second. Did you mean this chunk of code:

MySQLConnect::MySQLConnect(QString db_user, QString db_pass, QString db_name, QString host, QString type) {
 
  //connect to database
  QSqlDatabase db = QSqlDatabase::addDatabase(type);
  db.setHostName(host);
  db.setDatabaseName(db_name);
  db.setUserName(db_user);
  db.setPassword(db_pass);
 
  //get a pointer to a database connection
  m_pDatabase = &QSqlDatabase::database();
  Q_CHECK_PTR(m_pDatabase);
 
  //sql table model == read/write model --> navigate and modify individual sql tables
  m_pModel = new QSqlRelationalTableModel(this);
  Q_CHECK_PTR(m_pModel);
 
  //model->setTable(db_table);
  //all changes will be cached in the model until either submitAll() or revertAll() is called
  m_pModel->setEditStrategy(QSqlTableModel::OnManualSubmit);
 
  //populates the model with data from the table, using the specified filter and sort conditions
  //model->select();
}
 
//QSqlDatabase* MySQLConnect::m_pDatabase=0;
 
/*
//this function is called if a refresh button is clicked
void MySQLConnect::refresh_everything() {
        model->select();
}
 
void MySQLConnect::change_mysql() {
    //submits all pending changes to the mysql database
    model->submitAll();
}
*/

MySQLConnect::MySQLConnect(QString db_user, QString db_pass, QString db_name, QString host, QString type) {

  //connect to database
  QSqlDatabase db = QSqlDatabase::addDatabase(type);
  db.setHostName(host);
  db.setDatabaseName(db_name);
  db.setUserName(db_user);
  db.setPassword(db_pass);

  //get a pointer to a database connection
  m_pDatabase = &QSqlDatabase::database();
  Q_CHECK_PTR(m_pDatabase);

  //sql table model == read/write model --> navigate and modify individual sql tables
  m_pModel = new QSqlRelationalTableModel(this);
  Q_CHECK_PTR(m_pModel);

  //model->setTable(db_table);
  //all changes will be cached in the model until either submitAll() or revertAll() is called
  m_pModel->setEditStrategy(QSqlTableModel::OnManualSubmit);

  //populates the model with data from the table, using the specified filter and sort conditions
  //model->select();
}

//QSqlDatabase* MySQLConnect::m_pDatabase=0;

/*
//this function is called if a refresh button is clicked
void MySQLConnect::refresh_everything() {
        model->select();
}

void MySQLConnect::change_mysql() {
    //submits all pending changes to the mysql database
    model->submitAll();
}
*/

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[marcel]

Rewrite it like this:

MySQLConnect::MySQLConnect(QString db_user, QString db_pass, QString db_name, QString host, QString type) {
  //connect to database
  m_Database = QSqlDatabase::addDatabase(type);
  m_Database.setHostName(host);
  m_Database.setDatabaseName(db_name);
  m_Database.setUserName(db_user);
  m_Database.setPassword(db_pass);
  bool openedOK =  m_Database.open();
 
  m_pModel = new QSqlRelationalTableModel(this);
  Q_CHECK_PTR(m_pModel);
  m_pModel->setEditStrategy(QSqlTableModel::OnManualSubmit);
...
}

MySQLConnect::MySQLConnect(QString db_user, QString db_pass, QString db_name, QString host, QString type) {
  //connect to database
  m_Database = QSqlDatabase::addDatabase(type);
  m_Database.setHostName(host);
  m_Database.setDatabaseName(db_name);
  m_Database.setUserName(db_user);
  m_Database.setPassword(db_pass);
  bool openedOK =  m_Database.open();
   
  m_pModel = new QSqlRelationalTableModel(this);
  Q_CHECK_PTR(m_pModel);
  m_pModel->setEditStrategy(QSqlTableModel::OnManualSubmit);
...
}

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replace m_pDatabase with m_Database (not a pointer).