Problem in saving to database

Dear sir ,
I am using netbeans 6.1
My problem is that I am able to change the value of the JTable(connected to database) component by using jTable1.setValueAt(); but not the value of database.
Please tell me what to do If I have to save this modified value to database?
If I have to remove the row from Jtable the method jTable1.removeRowSelectionInterval(); only removes the selection but not deletes the row. Please tell how to do it?
And If I have to roll back the changes made to database then what to do for it?
regards
gaurav

Dear sir,
Please give me the direct link for the particular tutorila which I should read?
regards
gaurav

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