ABAP Select data from SAP table ISA_DSPLAY_DOCUMENT into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ISA_DSPLAY_DOCUMENT
*  INTO TABLE @DATA(IT_ISA_DSPLAY_DOCUMENT2).
*--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_ISA_DSPLAY_DOCUMENT INDEX 1 INTO DATA(WA_ISA_DSPLAY_DOCUMENT2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ISA_DSPLAY_DOCUMENT>-SETTLEMENTDOCUMENT = 1.
<ISA_DSPLAY_DOCUMENT>-CONTROLLINGAREA = 1.
<ISA_DSPLAY_DOCUMENT>-VALUEDATE = 1.
<ISA_DSPLAY_DOCUMENT>-EXCHANGERATETYPE = 1.
<ISA_DSPLAY_DOCUMENT>-FISCALYEAR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ISA_DSPLAY_DOCUMENT-SETTLEMENTPERIOD, sy-vline,
  WA_ISA_DSPLAY_DOCUMENT-CREATIONDATE, sy-vline,
  WA_ISA_DSPLAY_DOCUMENT-ACCOUNTINGDOCCREATEDBYUSER, sy-vline,
  WA_ISA_DSPLAY_DOCUMENT-ISREVERSAL, sy-vline,
  WA_ISA_DSPLAY_DOCUMENT-CTRLGSETTLMTREVERSEDDOCUMENT, sy-vline,
  WA_ISA_DSPLAY_DOCUMENT-CTRLGSETTLMTREVERSALDOCUMENT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ISA_DSPLAY_DOCUMENT 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_ISA_DSPLAY_DOCUMENT 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_ISA_DSPLAY_DOCUMENT INTO WA_ISA_DSPLAY_DOCUMENT.


*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.

*Conversion exit ALPHA, internal->external for field SETTLEMENTDOCUMENT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_ISA_DSPLAY_DOCUMENT-SETTLEMENTDOCUMENT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ISA_DSPLAY_DOCUMENT-SETTLEMENTDOCUMENT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GJAHR, internal->external for field FISCALYEAR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_ISA_DSPLAY_DOCUMENT-FISCALYEAR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ISA_DSPLAY_DOCUMENT-FISCALYEAR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field CTRLGSETTLMTREVERSEDDOCUMENT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_ISA_DSPLAY_DOCUMENT-CTRLGSETTLMTREVERSEDDOCUMENT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ISA_DSPLAY_DOCUMENT-CTRLGSETTLMTREVERSEDDOCUMENT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field CTRLGSETTLMTREVERSALDOCUMENT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_ISA_DSPLAY_DOCUMENT-CTRLGSETTLMTREVERSALDOCUMENT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ISA_DSPLAY_DOCUMENT-CTRLGSETTLMTREVERSALDOCUMENT.
WRITE:/ 'New Value:', ld_input.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_ISA_DSPLAY_DOCUMENT_STR, 
SETTLEMENTDOCUMENT TYPE STRING,
CONTROLLINGAREA TYPE STRING,
VALUEDATE TYPE STRING,
EXCHANGERATETYPE TYPE STRING,
FISCALYEAR TYPE STRING,
SETTLEMENTPERIOD TYPE STRING,
CREATIONDATE TYPE STRING,
ACCOUNTINGDOCCREATEDBYUSER TYPE STRING,
ISREVERSAL TYPE STRING,
CTRLGSETTLMTREVERSEDDOCUMENT TYPE STRING,
CTRLGSETTLMTREVERSALDOCUMENT TYPE STRING,
CTRLGSETTLMTRVSLDOCCRTNDATE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ISA_DSPLAY_DOCUMENT_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_ISA_DSPLAY_DOCUMENT_STR-SETTLEMENTDOCUMENT sy-vline 
WA_ISA_DSPLAY_DOCUMENT_STR-CONTROLLINGAREA sy-vline 
WA_ISA_DSPLAY_DOCUMENT_STR-VALUEDATE sy-vline 
WA_ISA_DSPLAY_DOCUMENT_STR-EXCHANGERATETYPE sy-vline 
WA_ISA_DSPLAY_DOCUMENT_STR-FISCALYEAR sy-vline 
WA_ISA_DSPLAY_DOCUMENT_STR-SETTLEMENTPERIOD sy-vline 
WA_ISA_DSPLAY_DOCUMENT_STR-CREATIONDATE sy-vline 
WA_ISA_DSPLAY_DOCUMENT_STR-ACCOUNTINGDOCCREATEDBYUSER sy-vline 
WA_ISA_DSPLAY_DOCUMENT_STR-ISREVERSAL sy-vline 
WA_ISA_DSPLAY_DOCUMENT_STR-CTRLGSETTLMTREVERSEDDOCUMENT sy-vline 
WA_ISA_DSPLAY_DOCUMENT_STR-CTRLGSETTLMTREVERSALDOCUMENT sy-vline 
WA_ISA_DSPLAY_DOCUMENT_STR-CTRLGSETTLMTRVSLDOCCRTNDATE sy-vline      INTO ld_text SEPARATED BY SPACE.

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