topic Re: Read Statement in Application Development and Automation Discussions

Read Statement

Former Member — Thu, 27 Oct 2005 11:04:53 GMT

Hi All,

I am new to ABAP ,could any one explain me the READ statment,

1. Is it specific any internal table type

2. How is readind data different from using loop.

Thanks in advance.

Re: Read Statement

rainer_hbenthal — Thu, 27 Oct 2005 11:07:38 GMT

Why dont you use the online help? Just position the cursor on the keyword read and press F1, all your questions will be answered there.

Re: Read Statement

FredericGirod — Thu, 27 Oct 2005 11:12:36 GMT

Hi Aima,

when you use LOOP, you will read all the data of the table. When you use READ, you will read only one line of the table.

for example a loop can be replace by.

describe table it_data lines v_count.
do.
  v_countb = v_countb + 1.
  if v_countb gt v_count.
    exit
  endif.
  read table it_data index v_countb.
enddo.

(I didn't check the code)

Read allow condition of selection, but you must be sure that this condition will only answer one line. Or you will not be sure that the answer will be the good one.

Have a look of the transaction ABAPDOCU for all advanced documentation.

Regards

Frédéric

Re: Read Statement

Vinod_Chandran — Thu, 27 Oct 2005 11:13:54 GMT

Hi Aima,

READ is for reading record from any type of internal table using index or with fields.

LOOP statement will loop through the internal table record by record, based on the condition given if any.

Hope this is clear.

Cheers

Vinod

Re: Read Statement

Former Member — Thu, 27 Oct 2005 11:17:43 GMT

Hi,

Suppose, the records in an internal table(it_table) with field ID are

1 2 3 4 5.

if we say:

Read table it_table with key id = '3'.

the number of records processed will be only 3.

if we say :

loop at it_table where id = '3'.

endloop.

the number of records processed will be 5.

the number of records processed in case of both read and loop will be same if record is not found.

Re: Read Statement

jayanthi_jayaraman — Thu, 27 Oct 2005 11:18:17 GMT

Hi,

Using read statement,you can only read single record.

But using loop,you can read more than one record.

Re: Read Statement

Former Member — Thu, 27 Oct 2005 11:35:20 GMT

Hi ,Firstly thanq for all ur replies,

Is it possible to use read statement for checking a validity date,i mean every syntax of READ uses '=' while checking the condition but for me the validaity date lies between two fields and specifing the condition like

datab =< wa_st-datum and datbi >= wa_st-datum

this will work.

Thanks,

Re: Read Statement

FredericGirod — Thu, 27 Oct 2005 11:38:38 GMT

You have to use the loop statement with condition gt ge lt le .. (> >= < <= ) and to exit to the first line.

for example

loop at it_table where datab =< wa_st-datum and datbi >= wa_st-datum.
  exit.
endloop.
if sy-subrc eq space.
  ... had your code ...
endif.