ABAP Select data from SAP table DISP_DOC into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DISP_DOC
*  INTO TABLE @DATA(IT_DISP_DOC2).
*--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_DISP_DOC INDEX 1 INTO DATA(WA_DISP_DOC2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DISP_DOC>-ACT = 1.
<DISP_DOC>-AID = 1.
<DISP_DOC>-ADID = 1.
<DISP_DOC>-OTI = 1.
<DISP_DOC>-OID = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DISP_DOC-WID, sy-vline,
  WA_DISP_DOC-WTI, sy-vline,
  WA_DISP_DOC-DTI, sy-vline,
  WA_DISP_DOC-DCL, sy-vline,
  WA_DISP_DOC-CTI, sy-vline,
  WA_DISP_DOC-CRTI, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DISP_DOC 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_DISP_DOC 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_DISP_DOC INTO WA_DISP_DOC.


*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_DISP_DOC_STR, 
ACT TYPE STRING,
AID TYPE STRING,
ADID TYPE STRING,
OTI TYPE STRING,
OID TYPE STRING,
WID TYPE STRING,
WTI TYPE STRING,
DTI TYPE STRING,
DCL TYPE STRING,
CTI TYPE STRING,
CRTI TYPE STRING,
URI TYPE STRING,
MARK TYPE STRING,
TBCL TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DISP_DOC_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_DISP_DOC_STR-ACT sy-vline 
WA_DISP_DOC_STR-AID sy-vline 
WA_DISP_DOC_STR-ADID sy-vline 
WA_DISP_DOC_STR-OTI sy-vline 
WA_DISP_DOC_STR-OID sy-vline 
WA_DISP_DOC_STR-WID sy-vline 
WA_DISP_DOC_STR-WTI sy-vline 
WA_DISP_DOC_STR-DTI sy-vline 
WA_DISP_DOC_STR-DCL sy-vline 
WA_DISP_DOC_STR-CTI sy-vline 
WA_DISP_DOC_STR-CRTI sy-vline 
WA_DISP_DOC_STR-URI sy-vline 
WA_DISP_DOC_STR-MARK sy-vline 
WA_DISP_DOC_STR-TBCL sy-vline      INTO ld_text SEPARATED BY SPACE.

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