Websphere adapter for JDBC WESB 6.0.2

I have a table with two coloumns in its primary key, one string column
and an int column. In the event table in the object_ket column I need
to add both values. My question is what do I use to delimit the two
values and what do I need to do to differentiate between an int and a
string.

Also if you know, could you point me to where in the documentation you
saw it 'cause I can't see it.

Thanks for any help.