[RESOLVIDO]Ajuda no insert

public class StopAtis {
    private static int i;
    private static int stringa1 ;
    private static int stringa2 ;
    private static int stringa3 ;
    private static String stringa4 = null;
    private static String stringa5 = null;
    private static int stringa6 ;
    private static int stringa7;
    private static int stringa8;

    /**
     * @param args the command line arguments
     */
	
	public static void main(String []args) throws BiffException, IOException, SQLException{
            
            System.out.println("Conectando ao Banco");
		
		Connection con = new ConnectionFactory().getConnection();
		
                GerarTxt gerarTxt = null;  
                
		Workbook workbook = Workbook.getWorkbook(new File("C:/teste/stop_atisciclo02345.xls"));
		
		Sheet sheet = workbook.getSheet(0);
		
		int linhas = sheet.getRows();
		
		for(i = 1; i < linhas; i++){
			Cell a1 = sheet.getCell(0,i);
			Cell b2 = sheet.getCell(1,i);
			Cell c3 = sheet.getCell(2,i);
			Cell d4 = sheet.getCell(3,i);
			Cell e5 = sheet.getCell(4,i);
			Cell f6 = sheet.getCell(5,i);
			Cell g7 = sheet.getCell(6,i);
			Cell h8 = sheet.getCell(7,i);
                        
				
			stringa1 = Integer.valueOf(a1.getContents());
			stringa2 = Integer.valueOf(b2.getContents());
			stringa3 = Integer.valueOf(c3.getContents());
			stringa4 = d4.getContents();
			stringa5 = e5.getContents();
			stringa6 = Integer.valueOf(f6.getContents());
			stringa7 = Integer.valueOf(g7.getContents());
			stringa8 = Integer.valueOf(h8.getContents());
			
			PreparedStatement st = con.prepareStatement("insert into rgd.stop_atis_daniel(cd_cliente,cd_conta,qtde,valor,motivo,conta,ciclo,terminal)"+"Values('"+stringa1+"','"+stringa2+"','"+stringa3+"','"+stringa4+"','"+stringa5+"','"+stringa6+"','"+stringa7+"','"+stringa8+"')");
                        st.executeUpdate();
                    
		
                        System.out.println("Importando!!!!");
		
		}
               
	}
	
}