Technically, in the old scenario you should also be catching SUBRCs before moving into structures too. This is debatable I guess but my 2 cents: Sometimes ignoring an exception is OK, for instance if you just want to, in your case, display an empty cell. I was typing a comment but it's getting to long. Is there any way to improve the readability of these table expressions? Am I using them improperly? Since every individual read might need to fail or succeed individually this quickly balloons out of proportion: TRY. Which is both longer and makes any simple read logic look incredibly complex and hard to read. However, it fails to mention that if a table expression fails to find a line it will raise exception CX_SY_ITAB_LINE_NOT_FOUND, so really that notation should actually be: TRY. With a single-line lv_order = lt_aufk-aufnr. WHERE, and with all types of assignments to itab.An official SAP presentation discussing new ABAP programming features in NetWeaver 7.4 (CD261) makes a big deal about table expressions, replacing the old syntax to read from an internal table: READ TABLE lt_aufk INTO ls_aufk WITH KEY aedat = sy-datum. However,Īt runtime, a runtime error always occurs in the case of the replacement of the entire table body with Otherwise, the syntax check simply returns a warning for compatibility reasons. If this is statically discernible,Ī syntax error occurs in classes and for LOOPS with statically discernible Since this usually leads to unpredictable programīehavior, you cannot access the entire table body in change mode in a loop. The case if new rows were added to the table afterwards. The loop to be exited at the next loop pass in accordance with the rules described above. The replacement of the entire table body in a LOOP using this table causes In the case of loops on index tables or if using a sorted key, this affects sy-tabix in the subsequent loop pass, and sy-tabix is decreased accordingly. If you delete the current row or rows before the current row, the internal loop counter is decreasedīy one with each deleted row. This affects sy-tabix, which is also increased (in the subsequent loop pass in the case of loops on index tables or when using a sorted key). If you insert rows before the current row, the internal loop counter is increased by one with each inserted If you delete rows after the current row, the deleted rows will no longer be processed in the subsequent loop passes. If you insert rows after the current row, these new rows will be processed in the subsequent loop passes. In the case of loops on hashed tables and if using a hash key, the position depends on the insertion sequence. Is determined by the row numbers in the corresponding table index in the case of loops on index tables Have the following effects: The position of inserted or deleted rows with regard to the current row If you insert or delete rows in the statement block of a LOOP, this will The system fields sy-tfill and sy-tleng are also filled. LOOP AT does not modify sy-subrc.Īfter leaving the loop using ENDLOOP, sy-tabix is set to the value that it had before entering the loop and that applies for sy-subrc: sy-subrc LOOP AT sets the value of the system field sy-tabix to the row number of the current row in the relevant table index. System Fieldsĭuring each loop run for index tables, and when you are using a If no appropriate rows are found or if the internal table is blank, the loop is not run at all. Have been read or until it is exited with a statement. The loop continues to run until all the table rows that meet the cond condition In each loop pass, the system field sy-tabix contains the value 0. In the table, and by the sort sequence with the SORT statement. The rows are processed in the order in which they were inserted In each loop pass, the system field sy-tabix contains the row number of the current row in the primary table index. The rows are read by ascending row numbers in the If no explicit table key name is declared after USING KEY, the order in which the rows are read depends on the table type as follows: To exit processing of the statement block, you can use the statements described in the The statement block between LOOP and ENDLOOP is executed once for each row. You can either read all the rows or specify cond conditions to restrict which rows to read. The table key with which the loop is executed can be determined in cond. The output response result determines how and to where the row contents are read. The LOOP statement reads rows from the internal table itab sequentially. The LOOP and ENDLOOP statements define a loopĪround a statement block. Processing Statements for Internal Tables LOOP AT itab
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