Dynamic expression in interface

Hi All
Could someone share a way how to create dynamic expression in ODI interface. Eg. I have metadata and want to build case expression on its basis and use it in interface.
I have tried several possibilities:
1) Use Java program in mapping expression.
But during interface steps creation getJDBCConnection() method returns null for both SRC and DEST.
Is there is a way how to connect to database?
2) Generate expression in procedure and use it in interface
Is there is a way how to pass string from procedure to interface?
3) Use variable to generate expression
Pure SQL is not enough to generate my expression, I need cycles, ifs etc.
4) Use special IKM which replace some substitution symbols with generated expression.
Well if there is no other choise I'll pick this up but don't want to have additional special KM.
Could someone propose other solution or workaround for listed?
Many thanks in advance!
Oleg Ivanov

Dev -
I followed this thread and thought I'll try it in my end. Did the following.
1)Created a procedure and pasted your code (changed the table name to mine)
2)Created an interface and connected my source and target. In one of the target columns I put <@=result@>
3)created a package and brought procedure and interface.
When I executed the procedure ran successfully but failed at the interface level. I am getting the following error message.
17008 : null : java.sql.SQLException: Closed Connection
java.sql.SQLException: Closed Connection
 at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:125)
 at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:162)
 at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:227)
 at oracle.jdbc.driver.PhysicalConnection.prepareStatement(PhysicalConnection.java:753)
 at oracle.jdbc.driver.PhysicalConnection.prepareStatement(PhysicalConnection.java:670)
 at com.sunopsis.sql.SnpsQuery.a(SnpsQuery.java)
 at com.sunopsis.sql.SnpsQuery.a(SnpsQuery.java)
 at com.sunopsis.sql.SnpsQuery.updateExecStatement(SnpsQuery.java)
 at com.sunopsis.sql.SnpsQuery.executeQuery(SnpsQuery.java)
 at com.sunopsis.dwg.dbobj.SnpSessTaskSql.execCollOrders(SnpSessTaskSql.java)
 at com.sunopsis.dwg.dbobj.SnpSessTaskSql.treatTaskTrt(SnpSessTaskSql.java)
 at com.sunopsis.dwg.dbobj.SnpSessTaskSqlI.treatTaskTrt(SnpSessTaskSqlI.java)
 at com.sunopsis.dwg.dbobj.SnpSessTaskSql.treatTask(SnpSessTaskSql.java)
 at com.sunopsis.dwg.dbobj.SnpSessStep.treatSessStep(SnpSessStep.java)
 at com.sunopsis.dwg.dbobj.SnpSession.treatSession(SnpSession.java)
 at com.sunopsis.dwg.cmd.DwgCommandSession.treatCommand(DwgCommandSession.java)
 at com.sunopsis.dwg.cmd.DwgCommandBase.execute(DwgCommandBase.java)
 at com.sunopsis.dwg.cmd.e.j(e.java)
 at com.sunopsis.dwg.cmd.h.z(h.java)
 at com.sunopsis.dwg.cmd.e.run(e.java)
 at java.lang.Thread.run(Unknown Source)

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