Pass a connection to a database inside of a parfor loop, within a function

I am trying to open and close a function within a parfor loop, within a function: lets look at an example:

a = 1;
conn = database(a,b,c,d,e,f,g)
function y = dosomething(conn,a)
close(conn)
    parfor i=1:10
        conn = database(a,b,c,d,e,f,g)  %or open(conn) or something???
        x(i) = somesubfun(conn,a+i);
        close(conn)
    end
y = x;