LOOP - Extract
Short Reference
ABAP Syntax(Obsolete) LOOP.
...
ENDLOOP.
What does it do? The LOOP and ENDLOOP statements define a
loop around a statement block. The loop is passed for each row from the
extract dataset until it is exited
using one of the statements from the section Exit
Loops . In each loop pass, the LOOP statement assigns the
contents of the components from the current row of the extract dataset
to the data objects that make up the field group of the row. If the
extract dataset is not sorted, the order in which the rows are read is
the same in which they were appended using the
EXTRACT statement. If the extract dataset is sorted using
SORT , the read order is the same as the
sort order.
A LOOP loop also ends the process of structuring the extract
dataset. If you execute an EXTRACT statement after a LOOP
statement, an unhandleable exception is raised. In addition, you cannot
process the extract dataset using either LOOP or SORT
within a LOOP block. You cannot nest LOOP blocks that read
the extract dataset.
System Fields
sy-subrc Meaning
0The loop was run at least once.
4The loop was not run at all.
Latest notes: Do not confuse the statement LOOP on the extract
dataset with the statement LOOP AT for
internal tables.
In global classes, no field groups can be defined or edited. In
methods of local classes of programs other than class pools, the sta
tement LOOP can be used for field groups defined in these
methods.
Extracts are obsolete. Internal tables are
recommended instead.
Example ABAP Coding See Extracts, Processing
Runtime Exceptions Non-catchable Exceptions
Reason for error: Nested loop at an extracted dataset.
Runtime error: LOOP_WITHIN_LOOP
Documentation extract taken from SAP system, � Copyright SAP AG. All rights reserved