ABAP Select data from SAP table DTAMCHF into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DTAMCHF
*  INTO TABLE @DATA(IT_DTAMCHF2).
*--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_DTAMCHF INDEX 1 INTO DATA(WA_DTAMCHF2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DTAMCHF>-F50A = 1.
<DTAMCHF>-F50C = 1.
<DTAMCHF>-F50E = 1.
<DTAMCHF>-F50G = 1.
<DTAMCHF>-F59D = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DTAMCHF-F59F, sy-vline,
  WA_DTAMCHF-F59H, sy-vline,
  WA_DTAMCHF-F59J, sy-vline,
  WA_DTAMCHF-F70A, sy-vline,
  WA_DTAMCHF-F70C, sy-vline,
  WA_DTAMCHF-F70E, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DTAMCHF 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_DTAMCHF 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_DTAMCHF INTO WA_DTAMCHF.


*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_DTAMCHF_STR, 
F50A TYPE STRING,
F50C TYPE STRING,
F50E TYPE STRING,
F50G TYPE STRING,
F59D TYPE STRING,
F59F TYPE STRING,
F59H TYPE STRING,
F59J TYPE STRING,
F70A TYPE STRING,
F70C TYPE STRING,
F70E TYPE STRING,
F70G TYPE STRING,
XAVIS_REQ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DTAMCHF_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_DTAMCHF_STR-F50A sy-vline 
WA_DTAMCHF_STR-F50C sy-vline 
WA_DTAMCHF_STR-F50E sy-vline 
WA_DTAMCHF_STR-F50G sy-vline 
WA_DTAMCHF_STR-F59D sy-vline 
WA_DTAMCHF_STR-F59F sy-vline 
WA_DTAMCHF_STR-F59H sy-vline 
WA_DTAMCHF_STR-F59J sy-vline 
WA_DTAMCHF_STR-F70A sy-vline 
WA_DTAMCHF_STR-F70C sy-vline 
WA_DTAMCHF_STR-F70E sy-vline 
WA_DTAMCHF_STR-F70G sy-vline 
WA_DTAMCHF_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.