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8. CALLing Functional Modules
Syntax:
CALL FUNCTION <module>
[EXPORTING f1 = a1 .... fn = an]
[IMPORTING f1 = a1 .... fn = an]
[CHANGING f1 = a1 .... fn = an]
[TABLES f1 = a1 .... fn = an]
[EXCEPTIONS e1 = r1 .... en = rn
Example:
CALL FUNCTION 'Z_DATE_CONVERSION'
EXPORTING STD_DATE = GEN_DATE
IMPORTING CH_DATE = NEW_DATE
9. List Events
TOP-Of-PAGE, END-OF-PAGE,
AT LINE-SELECTION, AT USER-COMMAND
These events are triggered by the ABAP runtime environment while a list is
being created or when a user performs an action on a list. The statement in
these blocks can format the list or process the user's request.
ABAP PERFORMANCE ISSUES.
ABAP/4 Optimization
Use the GET RUN TIME command to help evaluate performance. It's hard to know
whether that optimization technique REALLY helps unless you test it out. Using this
tool can help you know what is effective, under what kinds of conditions. The GET
RUN TIME has problems under multiple CPUs, so you should use it to test small
pieces of your program, rather than the whole program.
Avoid 'SELECT *', especially in tables that have a lot of fields. Use SELECT A B C
INTO instead, so that fields are only read if they are used. This can make a very big
difference.
Field-groups can be useful for multi-level sorting and displaying. However, they write
their data to the system's paging space, rather than to memory (internal tables use
memory). For this reason, field-groups are only appropriate for processing large lists
(e.g. over 50,000 records). If you have large lists, you should work with the systems
administrator to decide the maximum amount of RAM your program should use, and
from that, calculate how much space your lists will use. Then you can decide
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