ABAP Select data from SAP table DTATCHM into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DTATCHM
*  INTO TABLE @DATA(IT_DTATCHM2).
*--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_DTATCHM INDEX 1 INTO DATA(WA_DTATCHM2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DTATCHM>-MHDR = 1.
<DTATCHM>-M900 = 1.
<DTATCHM>-M905 = 1.
<DTATCHM>-M910 = 1.
<DTATCHM>-M915 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DTATCHM-M920, sy-vline,
  WA_DTATCHM-M925, sy-vline,
  WA_DTATCHM-M930, sy-vline,
  WA_DTATCHM-M935, sy-vline,
  WA_DTATCHM-M940, sy-vline,
  WA_DTATCHM-M945, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DTATCHM 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_DTATCHM 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_DTATCHM INTO WA_DTATCHM.


*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_DTATCHM_STR, 
MHDR TYPE STRING,
M900 TYPE STRING,
M905 TYPE STRING,
M910 TYPE STRING,
M915 TYPE STRING,
M920 TYPE STRING,
M925 TYPE STRING,
M930 TYPE STRING,
M935 TYPE STRING,
M940 TYPE STRING,
M945 TYPE STRING,
M950 TYPE STRING,
M955 TYPE STRING,
M960 TYPE STRING,
M965 TYPE STRING,
M970 TYPE STRING,
M980 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DTATCHM_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_DTATCHM_STR-MHDR sy-vline 
WA_DTATCHM_STR-M900 sy-vline 
WA_DTATCHM_STR-M905 sy-vline 
WA_DTATCHM_STR-M910 sy-vline 
WA_DTATCHM_STR-M915 sy-vline 
WA_DTATCHM_STR-M920 sy-vline 
WA_DTATCHM_STR-M925 sy-vline 
WA_DTATCHM_STR-M930 sy-vline 
WA_DTATCHM_STR-M935 sy-vline 
WA_DTATCHM_STR-M940 sy-vline 
WA_DTATCHM_STR-M945 sy-vline 
WA_DTATCHM_STR-M950 sy-vline 
WA_DTATCHM_STR-M955 sy-vline 
WA_DTATCHM_STR-M960 sy-vline 
WA_DTATCHM_STR-M965 sy-vline 
WA_DTATCHM_STR-M970 sy-vline 
WA_DTATCHM_STR-M980 sy-vline      INTO ld_text SEPARATED BY SPACE.

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