ABAP Select data from SAP table ISSOMU_RELFORM_LIST into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ISSOMU_RELFORM_LIST
*  INTO TABLE @DATA(IT_ISSOMU_RELFORM_LIST2).
*--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_ISSOMU_RELFORM_LIST INDEX 1 INTO DATA(WA_ISSOMU_RELFORM_LIST2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ISSOMU_RELFORM_LIST>-KEY = 1.
<ISSOMU_RELFORM_LIST>-PARENT_KEY = 1.
<ISSOMU_RELFORM_LIST>-ROOT_KEY = 1.
<ISSOMU_RELFORM_LIST>-NAME = 1.
<ISSOMU_RELFORM_LIST>-DESCRIPTION = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ISSOMU_RELFORM_LIST-LOGO, sy-vline,
  WA_ISSOMU_RELFORM_LIST-MIMETYPE, sy-vline,
  WA_ISSOMU_RELFORM_LIST-FILESIZE, sy-vline,
  WA_ISSOMU_RELFORM_LIST-THUMBNAIL, sy-vline,
  WA_ISSOMU_RELFORM_LIST-CREATEDBY, sy-vline,
  WA_ISSOMU_RELFORM_LIST-CREATEDAT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ISSOMU_RELFORM_LIST 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_ISSOMU_RELFORM_LIST 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_ISSOMU_RELFORM_LIST INTO WA_ISSOMU_RELFORM_LIST.


*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_ISSOMU_RELFORM_LIST_STR, 
KEY TYPE STRING,
PARENT_KEY TYPE STRING,
ROOT_KEY TYPE STRING,
NAME TYPE STRING,
DESCRIPTION TYPE STRING,
LOGO TYPE STRING,
MIMETYPE TYPE STRING,
FILESIZE TYPE STRING,
THUMBNAIL TYPE STRING,
CREATEDBY TYPE STRING,
CREATEDAT TYPE STRING,
CHANGEDBY TYPE STRING,
CHANGEDAT TYPE STRING,
FORM_MASTER TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ISSOMU_RELFORM_LIST_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_ISSOMU_RELFORM_LIST_STR-KEY sy-vline 
WA_ISSOMU_RELFORM_LIST_STR-PARENT_KEY sy-vline 
WA_ISSOMU_RELFORM_LIST_STR-ROOT_KEY sy-vline 
WA_ISSOMU_RELFORM_LIST_STR-NAME sy-vline 
WA_ISSOMU_RELFORM_LIST_STR-DESCRIPTION sy-vline 
WA_ISSOMU_RELFORM_LIST_STR-LOGO sy-vline 
WA_ISSOMU_RELFORM_LIST_STR-MIMETYPE sy-vline 
WA_ISSOMU_RELFORM_LIST_STR-FILESIZE sy-vline 
WA_ISSOMU_RELFORM_LIST_STR-THUMBNAIL sy-vline 
WA_ISSOMU_RELFORM_LIST_STR-CREATEDBY sy-vline 
WA_ISSOMU_RELFORM_LIST_STR-CREATEDAT sy-vline 
WA_ISSOMU_RELFORM_LIST_STR-CHANGEDBY sy-vline 
WA_ISSOMU_RELFORM_LIST_STR-CHANGEDAT sy-vline 
WA_ISSOMU_RELFORM_LIST_STR-FORM_MASTER sy-vline      INTO ld_text SEPARATED BY SPACE.

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