A description of the interface for a function module that is used for generic data extraction:
Importing Parameter
I_DSOURCE type SRSC_S_IF_SIMPLE-DSOURCE DataSource
I_INITFLAG type SRSC_S_IF_SIMPLE-INITFLAG Initialization call
I_MAXSIZE type SRSC_S_IF_SIMPLE-MAXSIZE package size
I_REQUNR type SRSC_S_IF_SIMPLE-REQUNR request number
Tables
I_T_SELECT type SRSC_S_IF_SIMPLE-T_SELECT
I_T_FIELDS type SRSC_S_IF_SIMPLE-T_SELECT
E_T_DATA
Exceptions
NO_MORE_DATA
ERROR_PASSED_TO_MESS_HANDLER
Details on Individual Parameters
This parameter is set to 'X' when the function module is called up for the first time, then to ' '.
This parameter contains the number of lines expected within a read call.
Extraction Process
The function module is called up again and again during an extraction process:
Only the request parameters are transferred to the module here. The module is as yet unable to transfer data.
The extractor returns the data typified with the extract structure in an interface table. The number of rows the system expected is determined in the request parameter (I_MAXSIZE).
The extractor returns the data enclosed within the first data package in a separate package with I_MAXSIZE rows.
Example
An example of a function module that meets these demands is RSAX_BIW_GET_DATA_SIMPLE. A simple way of creating a syntactically correct module is to copy it into its own function group and then to cope the rows of the top-include of function group RSAX (LRSAXTOP) into the top-include of its own function group. Afterwards, the copied function module must be adjusted to the individual requests.