关系管理系统:CustomerDaoimpl中添加用户代码update()

public void update(Customer c){
Connection conn = null;
PreparedStatement st = null;
ResultSet rs = null;
try{
conn = JdbcUtils.getConnection();
String sql = "update customer set name=?,gender=?,birthday=?,cellphone=?,email=?,preference=?,type=?,description=? where id=?";
st = conn.prepareStatement(sql);
st.setString(1, c.getName());
st.setString(2, c.getGender());
st.setDate(3, new java.sql.Date(c.getBirthday().getTime()));
st.setString(4, c.getCellphone());
st.setString(5, c.getEmail());
st.setString(6, c.getPreference());
st.setString(7, c.getType());
st.setString(8, c.getDescription());
st.setString(9, c.getId());

st.executeUpdate();
}catch (Exception e) {
throw new DaoException(e);
}finally{
JdbcUtils.release(conn, st, rs);
}