What will be input for custom module developed for JDBC adapter

Question

Hi,
I have a scenario SQLDB -> Xi -> R3 .
Here I have added a custom module before callsapadapter module.
As I know the sequence of module calling will be as follows :
1. Standard jdbc adapter
2. custom module
3. callsapadapter
Standard jdbc adapter has a select query . After that what will be the input format for my custom module .Will it be the xml structure of my source Data type or will it be a resultset or will it be a inputstream(stream of xml fomat????).
And then in which format i need to generate the output format for CallSapAdapter.
Regards

Answer 1

Hello Moni,
SAP has a wonderful feature in ABAP. There are some Runtime Errors that you can <i>catch</i>. This is somewhat similar to the Exception Handling procedure in Java / C++. So here's how you go about it....
Sometimes there might some calculations that we do, multiplication , for example, where the result of the arithmetic operation is known only at run-time. And the recepient for this result may not always be of the right type to take the result. Consider the following code:
parameters a type i obligatory.
data : b type i,
       c type i.
b = 99999999.
** Assume that the user has entered 99999999 for the value of the parameter a.
c = a * b.    " 99999999 * 99999999 "
write c.
This program will certainly give a short dump saying that there was an arithmetic overflow. But we can actually avoid this Shor Dump and handle the situation quite elegantly. consider the following.
parameters a type i obligatory.
data : b type i,
       c type i.
b = 99999999.
CATCH SYSTEM-EXCEPTIONS ARITHMETIC_ERRORS = 1.
** Assume that the user has entered 99999999 for the value of the parameter a.
   c = a * b.    " 99999999 * 99999999 "
ENDCATCH.
if sy-subrc ne 0.
  write: 'There was an arithmetic overflow in the calculation.'
else.
  write c.
endif.
This way you can actually avoid the short dump and make the system set a value for sy-subrc. Based on the avlue of the sy-subrc, you can go ahead with further processing / error-handling, as the case may be.
Here, ARITHMETIC_EXCEPTIONS is called an <i>exception group</i>. For more information on what other run-time errors can be <i>caught</i>, and What the various exception groups contain, please refer to the online documentation for the CATCH statement.
Regards,
Anand Mandalika.