Orcl:query-database in transform

Hi,
Suppose I am assigning the result of following to a field EmpId on the right had side of the transformation.
orcl:query-database(concat("select empno from emp where empno=",/tns:Root-Element/tns:Data/:tns:Empno),false(),false(),"jdbc/DbConnection")
Couple questions.
1) Can I use the above result in any subsequent queries in transformation, say get salary for this EmpID?
2) I am also worried about performance with this, as it doesn't look like the Empno is passed as a bind variable.
3) Is it possible to get the above query into a variable to be able to reuse later?
Appreciate your help.
Thanks

1) You cannot use for subsequent queries in transformation. Every time you need to define this function....
2) Performance may be an issue if transaction load is higher. You can see the time it takes for transform activity on BPEL Console.
3) You should be able to. Just go to Expression Builder in Assign activity and write orcl and ctrl+space. You should be able to view the options. This may help you http://blogs.oracle.com/rammenon/2007/05/passing_bpel_variable_contents.html

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