Problems with referencing to tables A1, A2 etc in appendix(with IEEEtran class)

Question

I'm trying to refer to some tables in the appendix of my paper, the following command have been used to number the tables as A1, A2 etc.:

\setcounter{table}{0}
\renewcommand{\thetable}{A\arabic{table}}

but when I use the \ref command for cross reference, It only shows table A, not Table A1 as I wanted, will someone help figure out why the reference goes wrong?

I'm using the IEEETran class, and whit the following code:

\appendix
\setcounter{table}{0}
\renewcommand{\thetable}{A\arabic{table}}


some text here and refer to Table \ref{tab:app-flexible}.


\begin{table}[!htbp]
\centering
\begin{threeparttable}
\label{tab:app-flexible}
\caption{Parameters balabala}
\begin{tabular}{cccc}
\toprule
table contents...
\bottomrule
\end{tabular}
\end{threeparttable}
\end{table}