如何在mysql表中自动链接上传

I have a form that uploads a file with other information to a database and displays it in a chart. Right now the chart only displays the file name and doesen't link it. If the file was called test1.pdf, how would I make it so on the chart it still says chart1.pdf but links it to the directory that the file is on?I have a form that uploads a file with other in