Refresh QDataTable

[shamik]

i opened the console and typed mysql
then mysql prompt appeared. do you mean this as mysql console??

now i typed the select query on that particular table. now the table is shown on the console.
keeping that open, i ran the exe of the project through which i want to change the database content. i made the changes from its GUI. but the sql table in the console showed the same result (it is obvious). to see the changes i have to write the query in the console again. then i can see the changes.

this is the case with the original project too. the qdatatable widget doesnt reflect the changes as it should be. but whenever i hide it and show other dialog and then again i hide the second dialog and show the original dialog with qdatatable widget then i can see the changes. (hiding and showing is implemented with the help of necessary functions inside the code like show(), hide() ).


if u call opening mysql from console which gives u mysql prompt like this-->
mysql>

then it is obvious that it wil show the changes in the database only if u write the query again after changing it from the GUI.

if u r talking of any other MYSQL console then please tell me how to open it and how to work on it. i'll try on that also.

[jacek]

but whenever i hide it and show other dialog and then again i hide the second dialog and show the original dialog with qdatatable widget then i can see the changes. (hiding and showing is implemented with the help of necessary functions inside the code like show(), hide() ).

Can you see the changes if you keep that QDataTable shown for more than 5 seconds (i.e. long enough for the timer to emit the signal)?

[shamik]

no.

no changes are seen in the qdatatable no matter howlong i keep the timer going on

[sunil.thaha]

It might be possible that the changes you make to the database from the client are not commited !!

So, You can try comitting the changes to database.
One more thing, Hope you are setting the interval as 3000 for 3 Sec

[shamik]

i have treid commiting the database after every record change but still it isnt working. the timer time can b anything, may be 3, 5, 7 sec etc. that is not a problem.
after the database is changed the timer may go on to even ticking 40 times still there is no change in the QDataTable.

even if the QDataTable is kept shown for say 5 mins then also there is no change in it. i.e. the updated values are not shown.

is there anything that v m missing ? i donno why does this simple one takes too much of time.
please help me

[jacek]

Can you see the changes if you update your database using the console (i.e. "mysql" program)?

[shamik]

No
cant see the changes in the QDataTable even if i change the database from mysql prompt :
mysql>

i dont understand what is the problems.??

[jacek]

Do you start any transactions before reading data from the database?

[shamik]

i dont use any trasactions
just start mysql and start reading data or execute the exe which does the same.

no complex things are done with mysql. just reading and writing the data. no transactions are used. no committing is done either.

this i think is an exceptional case of mine.

[jacek]

What happens if you set a new cursor instead of invoking refresh()?

[shamik]

i have temporarily solved the problem

what i used to do is i was loading a login dioalog from main. then from login dialog i used to load the edit dialog which contained the QDataTable and hide the login dialog.
but now what i m doing is instead of loading the login dialog from main, i m directly loading the edit dialog which contains QDataTable. now i can easily see the changes made to the database either from mysql prompt or from another project's GUI in current QDataTable without unloading and loading. i.e. now the refresh() and update() functions are working fine.

i think this is not the optimum solution but still it satisfies my requirements.

anyways,
thanks allllllloooooooot to all of you who have helped me so far and contributed in solving my problem.

but the original problem is still as it is.

hope the posts will continue in this thread so that the problem may not be risen by somebody else.

remember : together we can and we will make the difference.

[jacek]

what i used to do is i was loading a login dioalog from main. then from login dialog i used to load the edit dialog which contained the QDataTable and hide the login dialog.

In other words you had something like this?

int main(...) {
   QApplication app(...);
   ...
   LoginDialog dialog; // modal dialog
   dialog.exec(); // dialog shows the main window and exec() returns when user closes that window 
   ...
   return app.exec();
}

int main(...) {
   QApplication app(...);
   ...
   LoginDialog dialog; // modal dialog
   dialog.exec(); // dialog shows the main window and exec() returns when user closes that window 
   ...
   return app.exec();
}

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