How to pass parameters to query-database function [Solved]

Question

Dear All,
I'm working on a BPEL process which reads a file and the data is passes on
to a web service. In the transform activity to transform data from the source to the
web serivice parameters, I want to use the query-database function to check if
the value given in the file exists in the database. I have added a 'If' XSL construct
for this. Now when the query is static (given with hardcoded where clause), the
query-database function works fine. But I want to use one of the column in the
source variable in the SQL query I'm using in the query-database function.
i.e. If I give the query as below it is working:
<xsl:if test="orcl:query-database("select empno from emp
where empno='10'",.....) > 0">
I want to replace the hardcoded value 10 with the value from the source variable.
I'm not sure how this should be done. If I refer to the element directly in the XSL
it is not working. I've shown this below.
<xsl:if test="orcl:query-database("select empno from emp
where empno='/tns:Root-Element/tns:Data/:tns:Empno'",.....) > 0">
Something like above does not work. I'm not sure also if the syntax is correct. It
does not give any error, but the transformation does not happen.
Is there any way you can pass any input value as a parameter to the
query-database function?
Thanks in advance
-Ruban

Answer 1

Hi Dipal,
The concat works! Thank you very much for the help. I didn't try concat before.
I was using a alphanumeric field, so it was required to add one more concat
for enclosing the value with single quotes. For numerical fields, one concat would
be enough as you had shown.
My xsl looks like this now:
<xsl:if test="orcl:query-database(concat(concat("select empno from emp
where empno='",/tns:Root-Element/tns:Data/:tns:Empno),"'"),
false(),false(),"jdbc/DbConnection") > 0">
This works properly.
Regards,
-Ruban