ABAP Select data from SAP table DTAMCHP into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DTAMCHP
*  INTO TABLE @DATA(IT_DTAMCHP2).
*--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_DTAMCHP INDEX 1 INTO DATA(WA_DTAMCHP2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DTAMCHP>-P735 = 1.
<DTAMCHP>-P740 = 1.
<DTAMCHP>-P745 = 1.
<DTAMCHP>-P750 = 1.
<DTAMCHP>-P760 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DTAMCHP-P765, sy-vline,
  WA_DTAMCHP-P770, sy-vline,
  WA_DTAMCHP-P775, sy-vline,
  WA_DTAMCHP-P790, sy-vline,
  WA_DTAMCHP-P793, sy-vline,
  WA_DTAMCHP-P794, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DTAMCHP 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_DTAMCHP 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_DTAMCHP INTO WA_DTAMCHP.


*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_DTAMCHP_STR, 
P735 TYPE STRING,
P740 TYPE STRING,
P745 TYPE STRING,
P750 TYPE STRING,
P760 TYPE STRING,
P765 TYPE STRING,
P770 TYPE STRING,
P775 TYPE STRING,
P790 TYPE STRING,
P793 TYPE STRING,
P794 TYPE STRING,
P795 TYPE STRING,
P805 TYPE STRING,
P810 TYPE STRING,
P815 TYPE STRING,
P820 TYPE STRING,
P825 TYPE STRING,
XAVIS_REQ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DTAMCHP_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_DTAMCHP_STR-P735 sy-vline 
WA_DTAMCHP_STR-P740 sy-vline 
WA_DTAMCHP_STR-P745 sy-vline 
WA_DTAMCHP_STR-P750 sy-vline 
WA_DTAMCHP_STR-P760 sy-vline 
WA_DTAMCHP_STR-P765 sy-vline 
WA_DTAMCHP_STR-P770 sy-vline 
WA_DTAMCHP_STR-P775 sy-vline 
WA_DTAMCHP_STR-P790 sy-vline 
WA_DTAMCHP_STR-P793 sy-vline 
WA_DTAMCHP_STR-P794 sy-vline 
WA_DTAMCHP_STR-P795 sy-vline 
WA_DTAMCHP_STR-P805 sy-vline 
WA_DTAMCHP_STR-P810 sy-vline 
WA_DTAMCHP_STR-P815 sy-vline 
WA_DTAMCHP_STR-P820 sy-vline 
WA_DTAMCHP_STR-P825 sy-vline 
WA_DTAMCHP_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.