Is there a way to check if a db connection handle is still valid?

<p><font size="2">Hi there,</font><p><font size="2">Is there a way to check if a db connection handle is still
availble?My db program need to run forever and I found that if one insertion fails, the handle seems crashed. Then when
thenext insertion using the same handle will kill the whole program.</font><p><font size="2">Thanks in
advance!</font><p><fontsize="2">Andy </font>