ABAP Select data from SAP table DTAMCHK into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DTAMCHK
*  INTO TABLE @DATA(IT_DTAMCHK2).
*--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_DTAMCHK INDEX 1 INTO DATA(WA_DTAMCHK2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DTAMCHK>-K735 = 1.
<DTAMCHK>-K740 = 1.
<DTAMCHK>-K745 = 1.
<DTAMCHK>-K750 = 1.
<DTAMCHK>-K755 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DTAMCHK-K760, sy-vline,
  WA_DTAMCHK-K775, sy-vline,
  WA_DTAMCHK-K780, sy-vline,
  WA_DTAMCHK-K790, sy-vline,
  WA_DTAMCHK-K791, sy-vline,
  WA_DTAMCHK-K792, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DTAMCHK 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_DTAMCHK 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_DTAMCHK INTO WA_DTAMCHK.


*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_DTAMCHK_STR, 
K735 TYPE STRING,
K740 TYPE STRING,
K745 TYPE STRING,
K750 TYPE STRING,
K755 TYPE STRING,
K760 TYPE STRING,
K775 TYPE STRING,
K780 TYPE STRING,
K790 TYPE STRING,
K791 TYPE STRING,
K792 TYPE STRING,
K793 TYPE STRING,
K805 TYPE STRING,
K810 TYPE STRING,
K815 TYPE STRING,
K820 TYPE STRING,
K825 TYPE STRING,
XAVIS_REQ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DTAMCHK_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_DTAMCHK_STR-K735 sy-vline 
WA_DTAMCHK_STR-K740 sy-vline 
WA_DTAMCHK_STR-K745 sy-vline 
WA_DTAMCHK_STR-K750 sy-vline 
WA_DTAMCHK_STR-K755 sy-vline 
WA_DTAMCHK_STR-K760 sy-vline 
WA_DTAMCHK_STR-K775 sy-vline 
WA_DTAMCHK_STR-K780 sy-vline 
WA_DTAMCHK_STR-K790 sy-vline 
WA_DTAMCHK_STR-K791 sy-vline 
WA_DTAMCHK_STR-K792 sy-vline 
WA_DTAMCHK_STR-K793 sy-vline 
WA_DTAMCHK_STR-K805 sy-vline 
WA_DTAMCHK_STR-K810 sy-vline 
WA_DTAMCHK_STR-K815 sy-vline 
WA_DTAMCHK_STR-K820 sy-vline 
WA_DTAMCHK_STR-K825 sy-vline 
WA_DTAMCHK_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.