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erro nas colunas


failace
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 try {
         Class.forName("com.mysql.jdbc.Driver");
         Connection conn;
         conn = DriverManager.getConnection("jdbc:mysql://localhost/BD_Ligacao","root","");
         String query = "Update Setor Set Nome_Setor = ? WHERE Nome_Setor = ? ";
         PreparedStatement st = conn.prepareCall(query);
         String index;
         index = (String) JSetorTabela.getModel().getValueAt(JSetorTabela.getSelectedColumn(), 1);
         System.out.println(index);
         st.setString(1, JSetorCampo.getText());
         st.setString(2, index);
         st.executeUpdate();
        } catch (ClassNotFoundException ex) {
         System.out.println("Não foi possível encontrar a Classe");
       } catch (SQLException e) {
         System.out.println("Ocorreu um erro de SQL");

 

está funcionando mas n consigo escolher qual a linha q desejo ele so pega a primeira ou a segunda da tabela

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