Control loop statements

[Former Member]

Hello Gurus,

I always have the confusion while I am using the control loops statment with respective to fields I want to use control loops on.

data: begin of sample_tab occurs 0,

field1 like mara-matnr,

field2 like vbrp-vbeln,

field3 like maktx-maktl,

end of sample_tab.

Let's think that FIELD1 is the desired field that I want to apply the control loops statment logic on always. Please also let me know that what care that I have to take before the use of Control loop statement. Please explain following scenarios.

AT end of - field1 is first field in sample_tab?

- field2 is second field in sample_tab?

- field1 is first field in sample_tab and not

a key field of any db table.

- field1 is second field in sample_tab and not

a key field of any db table.

AT frist - field1 is first field in sample_tab?

- field2 is second field in sample_tab?

- field1 is first field in sample_tab and not

a key field of any db table?

- field1 is second field in sample_tab and not

a key field of any db table?

AT last - field1 is first field in sample_tab?

- field2 is second field in sample_tab?

- field1 is first field in sample_tab and not

a key field of any db table?

- field1 is second field in sample_tab and not

a key field of any db table?

on change of - field1 is first field in sample_tab?

- field2 is second field in sample_tab?

- field1 is first field in sample_tab and not

a key field of any db table?

- field1 is second field in sample_tab and not

a key field of any db table?

Thanks in advance.

SDN

[Former Member]

Hi,

Go through the link for control levels,

http://help.sap.com/saphelp_47x200/helpdata/en/fc/eb381a358411d1829f0000e829fbfe/content.htm

Regards,

Azaz Ali.

[abdul_hakim]

hi

before using the control loop statements you should sort the internal table by control break.

In your case you should sort your itab as <b>SORT SAMPLE_TAB BY FIELD1.</b>

Cheers,

Abdul Hakim

[aris_hidalgo]

Hi,

In order to properly use those statements, you should first sort your itab by field1. For example:

sort sample_tab by field1.

loop at sample_tab.

at end of field1.

write: / 'END'.

endat.

at first.

write: / 'This is the first record'.

endat.

at last.

write: / 'This is the last record'.

endat.

endloop.

Hope this helps...

P.S. Please award points for useful answers.

[former_member186741]

AT end of field1

- field1 is first field in sample_tab?

<b> will be processed whenever field1 changes </b>

AT end of field2

- field2 is second field in sample_tab?

<b> will be processed whenever field1 or field2 changes </b>

- field1 is first field in sample_tab and not

a key field of any db table.

<b> will be processed whenever field1 changes </b>

<b> being a key field is not relevant </b>

- field1 is second field in sample_tab and not

a key field of any db table.

<b> will be processed whenever field1 OR the first field changes </b>

<b> being a key field is not relevant </b>

AT frist - field1 is first field in sample_tab?

- field2 is second field in sample_tab?

- field1 is first field in sample_tab and not

a key field of any db table?

- field1 is second field in sample_tab and not

a key field of any db table?

<b> regardless of field values this code will be exected on the very FIRST pass of the loop</b>

AT last - field1 is first field in sample_tab?

- field2 is second field in sample_tab?

- field1 is first field in sample_tab and not

a key field of any db table?

- field1 is second field in sample_tab and not

a key field of any db table?

<b> regardless of field values this code will be exected on the very LAST pass of the loop</b>

on change of - field1 is first field in sample_tab?

- field2 is second field in sample_tab?

- field1 is first field in sample_tab and not

a key field of any db table?

- field1 is second field in sample_tab and not

a key field of any db table?

<b> do not use 'on change' this it is intended for 'selects' not loops. Instead use 'at new ..'. </b>

at new field1.

<b>This will be executed whenever the field1 value differs from the previous pass (or on the first pass).</b>

at new field2.

<b>This will be executed whenever the field1 OR field2 values differ from the previous pass (or on the first pass).</b>