topic Re: internal table when creating a class in Application Development and Automation Discussions

internal table when creating a class

Former Member — Tue, 05 Aug 2008 11:37:25 GMT

Hi everybody

im defining parameters when defining a class

one of the parameters is IT_MARA, of type MARA

Ive declared a method - SELECT_DATA, where the code is

SELECT * FROM MARA

INTO TABLE IT_MARA....

When activating it

Im getting the error - IT_MARA is not an internal table 'OCCURS n ' specification is missing

anybody knows how to solve that issue?

Re: internal table when creating a class

Former Member — Tue, 05 Aug 2008 11:39:56 GMT

data: IT_MARA type TABLE OF mara WITH HEADER LINE.

Re: internal table when creating a class

Former Member — Tue, 05 Aug 2008 11:45:52 GMT

Hi,

The declaration for internal table has to be like

IT_MARA TYPE TABLE OF MARA.

For classes, this much wont be sufficient. You need to declare the key for the table as well.

IT_MARA TYPE TABLE OF MARA WITH { DEFAULT KEY | key of your choice }.

Moreover it is not possible in OOABAP to declare internal tables with header line.

~Piyush Patil

Edited by: Piyush Patil on Aug 5, 2008 5:16 PM

Re: internal table when creating a class

Former Member — Tue, 05 Aug 2008 12:23:58 GMT

hmm ok, so how should I write it then?

anybody has any idea?

Re: internal table when creating a class

Former Member — Tue, 05 Aug 2008 12:42:19 GMT

hi,

Create a Work Area inside the class and use it as the Header for the internal table.

Regards

Sumit Agarwal

Re: internal table when creating a class

matt — Tue, 05 Aug 2008 12:46:36 GMT

Never use tables with header lines. It's bad programming.

In ABAP Objects and in non-ABAP Objects programs you should use the form:

DATA: mytab TYPE table_defn.

DATA: my_wa TYPE line_type.

E.g.

DATA: my_mara_tab TYPE HASHED TABLE OF mara WITH UNIQUE KEY matnr.
DATA: ls_mara TYPE mara.
FIELD-SYMBOLS: <ls_mara> TYPE mara.

LOOP AT my_mara_tab INTO ls_mara.
...
LOOP AT my_mara_tab ASSIGNING <ls_mara>,
...
READ TABLE my_mara_tab INTO ls_mara WITH TABLE KEY matnr = l_matnr

etc.

Get into the habit now!

Re: internal table when creating a class

former_member509072 — Tue, 05 Aug 2008 13:40:48 GMT

Hi Anjali,

I figure out you are having trouble passing an internal table out of a method of a class.

The error you get is because the parameter you have declared using TYPE MARA actually creates a line type and not an internal table in the signature of the method.

You have to declare the parameter with a 'table type' rather, and it will create an internal table.

You could use either a global table type or a local one.

Please have a look at the code below using a local table type for this problem:


CLASS a DEFINITION.
  PUBLIC SECTION.
    TYPES ty_mara TYPE TABLE OF mara.     "Local Table Type
    METHODS meth EXPORTING et_mara TYPE ty_mara.   "This makes an internal table
ENDCLASS. 


CLASS a IMPLEMENTATION.
  METHOD meth.
    SELECT * FROM mara INTO TABLE et_mara UP TO 10 ROWS.
  ENDMETHOD. 
ENDCLASS. 

START-OF-SELECTION.

  DATA lt_mara TYPE TABLE OF mara.
  DATA lr_a    TYPE REF TO a.

  CREATE OBJECT lr_a.
  CALL METHOD lr_a->meth
    IMPORTING
      et_mara = lt_mara.
  BREAK-POINT.

Re: internal table when creating a class

Former Member — Tue, 05 Aug 2008 14:02:32 GMT

Hi Anjali,

If you are working with global class

Using the push button Local Types

define the local type as

types : ty_mara type standard table of mara.

use the ty_mara in defining the parameter it will take as the table type

Define local work area for processing

Regards

Pavan

Re: internal table when creating a class

Former Member — Wed, 06 Aug 2008 11:47:46 GMT

Hi Pavan

can u describe me more in details plz?

im very new to OOP