ABAP Select data from SAP table DTADCHN into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DTADCHN
*  INTO TABLE @DATA(IT_DTADCHN2).
*--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_DTADCHN INDEX 1 INTO DATA(WA_DTADCHN2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DTADCHN>-N001 = 1.
<DTADCHN>-NHDR = 1.
<DTADCHN>-N155 = 1.
<DTADCHN>-N160 = 1.
<DTADCHN>-N165 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DTADCHN-N170, sy-vline,
  WA_DTADCHN-N175, sy-vline,
  WA_DTADCHN-N190, sy-vline,
  WA_DTADCHN-N192, sy-vline,
  WA_DTADCHN-N193, sy-vline,
  WA_DTADCHN-N195, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DTADCHN 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_DTADCHN 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_DTADCHN INTO WA_DTADCHN.


*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_DTADCHN_STR, 
N001 TYPE STRING,
NHDR TYPE STRING,
N155 TYPE STRING,
N160 TYPE STRING,
N165 TYPE STRING,
N170 TYPE STRING,
N175 TYPE STRING,
N190 TYPE STRING,
N192 TYPE STRING,
N193 TYPE STRING,
N195 TYPE STRING,
N200 TYPE STRING,
N215 TYPE STRING,
N232 TYPE STRING,
N235 TYPE STRING,
N236 TYPE STRING,
N237 TYPE STRING,
N255 TYPE STRING,
N260 TYPE STRING,
N315 TYPE STRING,
N320 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DTADCHN_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_DTADCHN_STR-N001 sy-vline 
WA_DTADCHN_STR-NHDR sy-vline 
WA_DTADCHN_STR-N155 sy-vline 
WA_DTADCHN_STR-N160 sy-vline 
WA_DTADCHN_STR-N165 sy-vline 
WA_DTADCHN_STR-N170 sy-vline 
WA_DTADCHN_STR-N175 sy-vline 
WA_DTADCHN_STR-N190 sy-vline 
WA_DTADCHN_STR-N192 sy-vline 
WA_DTADCHN_STR-N193 sy-vline 
WA_DTADCHN_STR-N195 sy-vline 
WA_DTADCHN_STR-N200 sy-vline 
WA_DTADCHN_STR-N215 sy-vline 
WA_DTADCHN_STR-N232 sy-vline 
WA_DTADCHN_STR-N235 sy-vline 
WA_DTADCHN_STR-N236 sy-vline 
WA_DTADCHN_STR-N237 sy-vline 
WA_DTADCHN_STR-N255 sy-vline 
WA_DTADCHN_STR-N260 sy-vline 
WA_DTADCHN_STR-N315 sy-vline 
WA_DTADCHN_STR-N320 sy-vline      INTO ld_text SEPARATED BY SPACE.

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