jdbc知识

try
{
??????? con? =
??????? stmt =
??????? rs?? =
}
catch (Exception e)
{
}
finally
{?
?????? try
????? {??????
??????? if(rs != null)
??????? {
?????????? rs.close();
?????????? rs=null;

??????? }
??????? if(stat != null)
??????? {
?????????? stat.close();
?????????? stat=null;

??????? }
??????? if(conn != null)
??????? {
?????????? conn.close();
?????????? conn=null;

??????? }
?????? }catch(Exception ignor){??????? }
}