ABAP Select data from SAP table DTAMCHL into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DTAMCHL
*  INTO TABLE @DATA(IT_DTAMCHL2).
*--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_DTAMCHL INDEX 1 INTO DATA(WA_DTAMCHL2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DTAMCHL>-L735 = 1.
<DTAMCHL>-L740 = 1.
<DTAMCHL>-L745 = 1.
<DTAMCHL>-L750 = 1.
<DTAMCHL>-L755 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DTAMCHL-L790, sy-vline,
  WA_DTAMCHL-L791, sy-vline,
  WA_DTAMCHL-L792, sy-vline,
  WA_DTAMCHL-L793, sy-vline,
  WA_DTAMCHL-L798, sy-vline,
  WA_DTAMCHL-L805, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DTAMCHL 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_DTAMCHL 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_DTAMCHL INTO WA_DTAMCHL.


*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_DTAMCHL_STR, 
L735 TYPE STRING,
L740 TYPE STRING,
L745 TYPE STRING,
L750 TYPE STRING,
L755 TYPE STRING,
L790 TYPE STRING,
L791 TYPE STRING,
L792 TYPE STRING,
L793 TYPE STRING,
L798 TYPE STRING,
L805 TYPE STRING,
L810 TYPE STRING,
L815 TYPE STRING,
L820 TYPE STRING,
L825 TYPE STRING,
XAVIS_REQ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DTAMCHL_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_DTAMCHL_STR-L735 sy-vline 
WA_DTAMCHL_STR-L740 sy-vline 
WA_DTAMCHL_STR-L745 sy-vline 
WA_DTAMCHL_STR-L750 sy-vline 
WA_DTAMCHL_STR-L755 sy-vline 
WA_DTAMCHL_STR-L790 sy-vline 
WA_DTAMCHL_STR-L791 sy-vline 
WA_DTAMCHL_STR-L792 sy-vline 
WA_DTAMCHL_STR-L793 sy-vline 
WA_DTAMCHL_STR-L798 sy-vline 
WA_DTAMCHL_STR-L805 sy-vline 
WA_DTAMCHL_STR-L810 sy-vline 
WA_DTAMCHL_STR-L815 sy-vline 
WA_DTAMCHL_STR-L820 sy-vline 
WA_DTAMCHL_STR-L825 sy-vline 
WA_DTAMCHL_STR-XAVIS_REQ sy-vline      INTO ld_text SEPARATED BY SPACE.

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