[PyQt] changes to the model is not applied to the database.

[iMath]

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 !
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