ABAP Select data from SAP table TMAC into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TMAC
*  INTO TABLE @DATA(IT_TMAC2).
*--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_TMAC INDEX 1 INTO DATA(WA_TMAC2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TMAC>-MCOB = 1.
<TMAC>-MCID = 1.
<TMAC>-SBID = 1.
<TMAC>-DLFLG = 1.
<TMAC>-EUFLG = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TMAC-UFLAG, sy-vline,
  WA_TMAC-DBTYP, sy-vline,
  WA_TMAC-TABN1, sy-vline,
  WA_TMAC-TABN2, sy-vline,
  WA_TMAC-TABN3, sy-vline,
  WA_TMAC-TABN4, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TMAC 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_TMAC 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_TMAC INTO WA_TMAC.


*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_TMAC_STR, 
MCOB TYPE STRING,
MCID TYPE STRING,
SBID TYPE STRING,
DLFLG TYPE STRING,
EUFLG TYPE STRING,
UFLAG TYPE STRING,
DBTYP TYPE STRING,
TABN1 TYPE STRING,
TABN2 TYPE STRING,
TABN3 TYPE STRING,
TABN4 TYPE STRING,
TABL1 TYPE STRING,
TABL2 TYPE STRING,
TABL3 TYPE STRING,
TABL4 TYPE STRING,
FLDDE TYPE STRING,
KEYDE TYPE STRING,
CONDE TYPE STRING,
VFLD1 TYPE STRING,
VFLD2 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TMAC_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_TMAC_STR-MCOB sy-vline 
WA_TMAC_STR-MCID sy-vline 
WA_TMAC_STR-SBID sy-vline 
WA_TMAC_STR-DLFLG sy-vline 
WA_TMAC_STR-EUFLG sy-vline 
WA_TMAC_STR-UFLAG sy-vline 
WA_TMAC_STR-DBTYP sy-vline 
WA_TMAC_STR-TABN1 sy-vline 
WA_TMAC_STR-TABN2 sy-vline 
WA_TMAC_STR-TABN3 sy-vline 
WA_TMAC_STR-TABN4 sy-vline 
WA_TMAC_STR-TABL1 sy-vline 
WA_TMAC_STR-TABL2 sy-vline 
WA_TMAC_STR-TABL3 sy-vline 
WA_TMAC_STR-TABL4 sy-vline 
WA_TMAC_STR-FLDDE sy-vline 
WA_TMAC_STR-KEYDE sy-vline 
WA_TMAC_STR-CONDE sy-vline 
WA_TMAC_STR-VFLD1 sy-vline 
WA_TMAC_STR-VFLD2 sy-vline      INTO ld_text SEPARATED BY SPACE.

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