Hello again!

I have following code:

Qt Code: 
  1. CBrowserWindow::CBrowserWindow(QWidget *parent, MySQLConnect* pDataBase, QString sTableName)
  2.  : QWidget(parent)
  3. {
  4.   Q_CHECK_PTR(pDataBase); // if database connection is NULL, we have a big problem
  5.  
  6.   m_pModel=new QSqlRelationalTableModel(this);  // creates new model
  7.   Q_CHECK_PTR(m_pModel);  // checks for succesful creation
  8.   m_pModel->setTable(sTableName); // sets table name
  9.  
  10.   m_pColumnNames=new QStringList(); // creates new string list
  11.   Q_CHECK_PTR(m_pColumnNames);  // checks for succesful creation
  12.  
  13.   // fetches record
  14.   m_pTableRecord=new QSqlRecord(); // creates new record
  15.   Q_CHECK_PTR(m_pTableRecord);  // checks for susccesful creation
  16.   //m_pTableRecord=&pDataBase->m_pDatabase->record(sTableName); // fetches column names
  17.   m_pTableRecord=&pDataBase->m_pDatabase->record(sTableName); // fetches column names
  18.  
  19.  
  20.   if (!m_pTableRecord->isEmpty()) {
  21.     for (m_iIndex=0; m_iIndex<m_pTableRecord->count(); m_iIndex++) {
  22.       m_pColumnNames->append(m_pTableRecord->fieldName(m_iIndex));
  23.     }
  24.   } // if
  25.  
  26.   createBrowserContens(pDataBase, m_pColumnNames);  // creates browser controls
  27.  
  28.   delete m_pModel;  // deletes pModel;
  29.   delete m_pTableRecord;  // deletes m_pTableRecord
  30.   // just to be sure
  31.   m_pModel=0;
  32.   m_pTableRecord=0;
  33. }
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and in the line
Qt Code: 
  1. m_pTableRecord=&pDataBase->m_pDatabase->record(sTableName); // fetches column names
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I get segmentation fault. What I am trying to do is to dynamically fetch table column names from mysql database and then create table widget for record display. Why do I get segfault?

Here is class description:
Qt Code: 
  1. class CBrowserWindow : public QWidget
  2. {
  3.   Q_OBJECT
  4. public:
  5.     CBrowserWindow(QWidget *parent = 0, MySQLConnect* pDataBase=0, QString sTableName="");
  6.  
  7.     ~CBrowserWindow();
  8.  
  9. private:
  10.   QStringList* m_pColumnNames;  // column names for selected database
  11.  
  12. private:
  13.   // buttons
  14.   QPushButton* m_pButtonAdd;  // button for addition of record
  15.   QPushButton* m_pButtonChange; // button for change of record
  16.   QPushButton* m_pButtonDelete; // button for deletion of record
  17.   QPushButton* m_pButtonSelect; // button for selection of record
  18.  
  19. private:
  20.   // layouts
  21.   QHBoxLayout* m_pHorizLayout; // horizontal leyout
  22.   QVBoxLayout* m_pVertLayout; // vertical layout
  23.  
  24. private:
  25.   // mebmers needed for column idetification
  26.   QSqlRelationalTableModel* m_pModel; // pointer to pmodel
  27.   QSqlRecord* m_pTableRecord; // pointer to database record
  28.   QTableView* m_pView;  // pointer to view
  29.   QGridLayout* m_pGridLayout; // pointer to grid layout
  30.   quint16 m_iIndex; // index in for loops - this type is guaranteed to be 16-bit on all platforms supported by Qt
  31.  
  32. private:
  33.   // private methods
  34.   void createBrowserContens(MySQLConnect* pDatabase, QStringList* pColumnNames); // creates table on widget
  35. };
  36.  
  37. #endif
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