ABAP Select data from SAP table MACID into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP MACID 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 MACID. 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 MACID 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_MACID TYPE STANDARD TABLE OF MACID,
      WA_MACID TYPE MACID,
      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: <MACID> TYPE MACID.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MACID
*  INTO TABLE @DATA(IT_MACID2).
*--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_MACID INDEX 1 INTO DATA(WA_MACID2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MACID>-MCONAME = 1.
<MACID>-MCID = 1.
<MACID>-FLAG1 = 1.
<MACID>-POOLTAB = 1.
<MACID>-TIMESTMP = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MACID-TABNO, sy-vline,
  WA_MACID-TTABNO, sy-vline,
  WA_MACID-FLDNO, sy-vline,
  WA_MACID-BPLNO, sy-vline,
  WA_MACID-BFLNO, sy-vline,
  WA_MACID-LRLG, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MACID 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_MACID 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_MACID INTO WA_MACID.


*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_MACID_STR, 
MCONAME TYPE STRING,
MCID TYPE STRING,
FLAG1 TYPE STRING,
POOLTAB TYPE STRING,
TIMESTMP TYPE STRING,
TABNO TYPE STRING,
TTABNO TYPE STRING,
FLDNO TYPE STRING,
BPLNO TYPE STRING,
BFLNO TYPE STRING,
LRLG TYPE STRING,
MCIDESC TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MACID_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_MACID_STR-MCONAME sy-vline 
WA_MACID_STR-MCID sy-vline 
WA_MACID_STR-FLAG1 sy-vline 
WA_MACID_STR-POOLTAB sy-vline 
WA_MACID_STR-TIMESTMP sy-vline 
WA_MACID_STR-TABNO sy-vline 
WA_MACID_STR-TTABNO sy-vline 
WA_MACID_STR-FLDNO sy-vline 
WA_MACID_STR-BPLNO sy-vline 
WA_MACID_STR-BFLNO sy-vline 
WA_MACID_STR-LRLG sy-vline 
WA_MACID_STR-MCIDESC sy-vline      INTO ld_text SEPARATED BY SPACE.

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