ABAP Select data from SAP table DTAMCHD into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DTAMCHD
*  INTO TABLE @DATA(IT_DTAMCHD2).
*--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_DTAMCHD INDEX 1 INTO DATA(WA_DTAMCHD2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DTAMCHD>-D50A = 1.
<DTAMCHD>-D50C = 1.
<DTAMCHD>-D50E = 1.
<DTAMCHD>-D50G = 1.
<DTAMCHD>-D57E = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DTAMCHD-D57G, sy-vline,
  WA_DTAMCHD-D57I, sy-vline,
  WA_DTAMCHD-D57K, sy-vline,
  WA_DTAMCHD-D59D, sy-vline,
  WA_DTAMCHD-D59F, sy-vline,
  WA_DTAMCHD-D59H, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DTAMCHD 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_DTAMCHD 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_DTAMCHD INTO WA_DTAMCHD.


*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_DTAMCHD_STR, 
D50A TYPE STRING,
D50C TYPE STRING,
D50E TYPE STRING,
D50G TYPE STRING,
D57E TYPE STRING,
D57G TYPE STRING,
D57I TYPE STRING,
D57K TYPE STRING,
D59D TYPE STRING,
D59F TYPE STRING,
D59H TYPE STRING,
D59J TYPE STRING,
D70A TYPE STRING,
D70C TYPE STRING,
D70E TYPE STRING,
D70G TYPE STRING,
XAVIS_REQ TYPE STRING,
D72A TYPE STRING,
D72B TYPE STRING,
D72C TYPE STRING,
D72D TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DTAMCHD_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_DTAMCHD_STR-D50A sy-vline 
WA_DTAMCHD_STR-D50C sy-vline 
WA_DTAMCHD_STR-D50E sy-vline 
WA_DTAMCHD_STR-D50G sy-vline 
WA_DTAMCHD_STR-D57E sy-vline 
WA_DTAMCHD_STR-D57G sy-vline 
WA_DTAMCHD_STR-D57I sy-vline 
WA_DTAMCHD_STR-D57K sy-vline 
WA_DTAMCHD_STR-D59D sy-vline 
WA_DTAMCHD_STR-D59F sy-vline 
WA_DTAMCHD_STR-D59H sy-vline 
WA_DTAMCHD_STR-D59J sy-vline 
WA_DTAMCHD_STR-D70A sy-vline 
WA_DTAMCHD_STR-D70C sy-vline 
WA_DTAMCHD_STR-D70E sy-vline 
WA_DTAMCHD_STR-D70G sy-vline 
WA_DTAMCHD_STR-XAVIS_REQ sy-vline 
WA_DTAMCHD_STR-D72A sy-vline 
WA_DTAMCHD_STR-D72B sy-vline 
WA_DTAMCHD_STR-D72C sy-vline 
WA_DTAMCHD_STR-D72D sy-vline      INTO ld_text SEPARATED BY SPACE.

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