ABAP Select data from SAP table DTAMCHI into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DTAMCHI
*  INTO TABLE @DATA(IT_DTAMCHI2).
*--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_DTAMCHI INDEX 1 INTO DATA(WA_DTAMCHI2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DTAMCHI>-I735 = 1.
<DTAMCHI>-I740 = 1.
<DTAMCHI>-I745 = 1.
<DTAMCHI>-I750 = 1.
<DTAMCHI>-I755 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DTAMCHI-I760, sy-vline,
  WA_DTAMCHI-I765, sy-vline,
  WA_DTAMCHI-I770, sy-vline,
  WA_DTAMCHI-I775, sy-vline,
  WA_DTAMCHI-I780, sy-vline,
  WA_DTAMCHI-I790, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DTAMCHI 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_DTAMCHI 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_DTAMCHI INTO WA_DTAMCHI.


*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_DTAMCHI_STR, 
I735 TYPE STRING,
I740 TYPE STRING,
I745 TYPE STRING,
I750 TYPE STRING,
I755 TYPE STRING,
I760 TYPE STRING,
I765 TYPE STRING,
I770 TYPE STRING,
I775 TYPE STRING,
I780 TYPE STRING,
I790 TYPE STRING,
I791 TYPE STRING,
I792 TYPE STRING,
I793 TYPE STRING,
I798 TYPE STRING,
I805 TYPE STRING,
I810 TYPE STRING,
I815 TYPE STRING,
I820 TYPE STRING,
I825 TYPE STRING,
XAVIS_REQ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DTAMCHI_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_DTAMCHI_STR-I735 sy-vline 
WA_DTAMCHI_STR-I740 sy-vline 
WA_DTAMCHI_STR-I745 sy-vline 
WA_DTAMCHI_STR-I750 sy-vline 
WA_DTAMCHI_STR-I755 sy-vline 
WA_DTAMCHI_STR-I760 sy-vline 
WA_DTAMCHI_STR-I765 sy-vline 
WA_DTAMCHI_STR-I770 sy-vline 
WA_DTAMCHI_STR-I775 sy-vline 
WA_DTAMCHI_STR-I780 sy-vline 
WA_DTAMCHI_STR-I790 sy-vline 
WA_DTAMCHI_STR-I791 sy-vline 
WA_DTAMCHI_STR-I792 sy-vline 
WA_DTAMCHI_STR-I793 sy-vline 
WA_DTAMCHI_STR-I798 sy-vline 
WA_DTAMCHI_STR-I805 sy-vline 
WA_DTAMCHI_STR-I810 sy-vline 
WA_DTAMCHI_STR-I815 sy-vline 
WA_DTAMCHI_STR-I820 sy-vline 
WA_DTAMCHI_STR-I825 sy-vline 
WA_DTAMCHI_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.