hi to all, I've centso7.5 and Qt 5.7 in VM. i am tryng to build a program having following code
problem is that when assigning a query value in to a QString variable, program crashes. how to solve it.
mine function is :-
-------------------
Qt Code: 
  1. product_record* product_record::product_search(int numb)
  2. {
  3.     QString sql = "select * from tableProductRecords where number = ?";
  4.     QSqlQuery qry;
  5.     qry.prepare(sql);
  6.  
  7.     qry.bindValue(0, numb);
  8.  
  9.     if(qry.exec())
  10.     {
  11.         if(qry.next())
  12.         {
  13.             this->name = qry.value(0).toString();// here program crashes
  14.             stock = qry.value(1).toInt();
  15.             rate = qry.value(2).toFloat();
  16.             number = qry.value(3).toInt();
  17.         }
  18.     }
  19.     return this;
  20. }
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this is mine header file :-
---------------------------------
Qt Code: 
  1. #ifndef PRODUCT_RECORD_H
  2. #define PRODUCT_RECORD_H
  3.  
  4. #include <QObject>
  5. #include <QString>
  6. #include <QSqlDatabase>
  7. #include <QSqlQuery>
  8. #include <QVariant>
  9. #include <QMessageBox>
  10. #include <QSqlError>
  11.  
  13.  
  14. class product_record : public QObject
  15. {
  16.     Q_OBJECT
  17.  
  18.    QString  name;
  19.     int      stock;
  20.     float    rate;
  21.     int      number;
  22.  
  23. public:
  24.     product_record();
  25.     ~product_record();
  26.  
  27.     product_record * product_search(int numb);
  28.     void product_modify(int no);
  29.  
  30. // getters and setters
  31.  
  32.     QString text_name();
  33.     int     text_stock();
  34.     float   text_rate();
  35.     int     text_number();
  36.  
  37.     void setText_name(QString *str);
  38.     void setText_stcok(int *i);
  39.     void setText_rate(float *f);
  40.     void setText_number(int *n);
  41. };
  42.  
  43. #endif // PRODUCT_RECORD_H
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