ABAP Select data from SAP table MCMSEGADD4 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP MCMSEGADD4 table and store it within an internal table, including using the newer @DATA inline declaration methods. It also shows you various ways to process this data using ABAP work area, inline declaration or field symbols including executing all the relevant CONVERSION_EXIT routines specific to MCMSEGADD4. See here for more generic Select statement tips.

Sometimes data within SAP is stored within the database table in a different format to what it is displayed to the user. These input/output conversation FM routines are what translates the data between the two formats.

There is also a full declaration of the MCMSEGADD4 table where each field has a char/string type for you to simply copy and paste. This allows you to use processing that is only available to these field types such as the CONCATENATE statement.

DATA: IT_MCMSEGADD4 TYPE STANDARD TABLE OF MCMSEGADD4,
      WA_MCMSEGADD4 TYPE MCMSEGADD4,
      GD_STR TYPE STRING.

DATA: lo_typedescr type REF TO cl_abap_typedescr.
DATA: lv_fieldname type fieldname.

FIELD-SYMBOLS: <FIELD> TYPE any.
FIELD-SYMBOLS: <MCMSEGADD4> TYPE MCMSEGADD4.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_MCMSEGADD4.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM MCMSEGADD4
  INTO TABLE IT_MCMSEGADD4.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MCMSEGADD4
*  INTO TABLE @DATA(IT_MCMSEGADD42).
*--Further methods of using ABAP code to  select data from SAP database tables

*You can also declare the header/work area using the in-line DATA declaration method
READ TABLE IT_MCMSEGADD4 INDEX 1 INTO DATA(WA_MCMSEGADD42).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_MCMSEGADD4 ASSIGNING <MCMSEGADD4>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MCMSEGADD4>-SUPKZ = 1.
<MCMSEGADD4>-UPDKZ = 1.
<MCMSEGADD4>-XSTBW = 1.
<MCMSEGADD4>-NEUAUF_BEW = 1.
<MCMSEGADD4>-STGRP1 = 1.

ENDLOOP.

LOOP AT IT_MCMSEGADD4 INTO WA_MCMSEGADD4.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MCMSEGADD4-STGRP2, sy-vline,
  WA_MCMSEGADD4-STGRP3, sy-vline,
  WA_MCMSEGADD4-STGRP4, sy-vline,
  WA_MCMSEGADD4-UMLKZ, sy-vline,
  WA_MCMSEGADD4-RETKZ, sy-vline,
  WA_MCMSEGADD4-INVKZ, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MCMSEGADD4 you want to display...

  WRITE:/ sy-uline.
* Aternatively use generic code to Write field values (and NAME) to screen report
  DO.
    ASSIGN COMPONENT sy-index OF STRUCTURE wa_MCMSEGADD4 TO <field>.
    IF sy-subrc <> 0. EXIT. ENDIF.
    WRITE:/ 'Field Value', <field>, sy-vline.
    gd_str = <field> .
    lo_typedescr ?= CL_ABAP_DATADESCR=>DESCRIBE_BY_DATA( <field> ).
    lv_fieldname = lo_typedescr->GET_RELATIVE_NAME( ).
    WRITE:/ 'Field Name', lv_fieldname.
  ENDDO.

  
*Redo loop but convert all fields from internal to out value  
LOOP AT IT_MCMSEGADD4 INTO WA_MCMSEGADD4.


*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Convert all fields to display/output versions using conversion routines
  PERFORM convert_all_field_values CHANGING wa_EKKO.
	 
ENDLOOP.

  
*&---------------------------------------------------------------------*
*& Form convert_all_field_values
*&---------------------------------------------------------------------*
FORM convert_all_field_values CHANGING p_EKKO LIKE wa_EKKO.
DATA: ld_input(1000) TYPE c, ld_output(1000) TYPE C.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_MCMSEGADD4_STR, 
SUPKZ TYPE STRING,
UPDKZ TYPE STRING,
XSTBW TYPE STRING,
NEUAUF_BEW TYPE STRING,
STGRP1 TYPE STRING,
STGRP2 TYPE STRING,
STGRP3 TYPE STRING,
STGRP4 TYPE STRING,
UMLKZ TYPE STRING,
RETKZ TYPE STRING,
INVKZ TYPE STRING,
KORR TYPE STRING,
XUMBEW TYPE STRING,
XCHAR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MCMSEGADD4_STR type T_EKKO_STR.

DATA: ld_text TYPE string.

LOOP AT IT_EKKO INTO WA_EKKO.
  MOVE-CORRESPONDING wa_EKKO TO WA_EKKO_STR.
  CONCATENATE: sy-vline
WA_MCMSEGADD4_STR-SUPKZ sy-vline 
WA_MCMSEGADD4_STR-UPDKZ sy-vline 
WA_MCMSEGADD4_STR-XSTBW sy-vline 
WA_MCMSEGADD4_STR-NEUAUF_BEW sy-vline 
WA_MCMSEGADD4_STR-STGRP1 sy-vline 
WA_MCMSEGADD4_STR-STGRP2 sy-vline 
WA_MCMSEGADD4_STR-STGRP3 sy-vline 
WA_MCMSEGADD4_STR-STGRP4 sy-vline 
WA_MCMSEGADD4_STR-UMLKZ sy-vline 
WA_MCMSEGADD4_STR-RETKZ sy-vline 
WA_MCMSEGADD4_STR-INVKZ sy-vline 
WA_MCMSEGADD4_STR-KORR sy-vline 
WA_MCMSEGADD4_STR-XUMBEW sy-vline 
WA_MCMSEGADD4_STR-XCHAR sy-vline      INTO ld_text SEPARATED BY SPACE.

*Add any further fields from structure WA_EKKO_STR you want to CONCATENATE...
ENDLOOP.
ENDFORM.