Changes to the model is not applied to the database.

[redstoneleo]

After setting up a table model in the following code:
http://codepad.org/nAUt68p1

changes to the model is not applied to the database.

In eric python IDE(In other IDE may not found this error),after edited the data item,it shows the following error:
@
QSqlQuery::value: not positioned on a valid record
@

anyone can help me fix this problem ?thanks !