ABAP Select data from SAP table DMC_RSREL into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DMC_RSREL
*  INTO TABLE @DATA(IT_DMC_RSREL2).
*--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_DMC_RSREL INDEX 1 INTO DATA(WA_DMC_RSREL2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DMC_RSREL>-GUID = 1.
<DMC_RSREL>-RSTRUCT = 1.
<DMC_RSREL>-SSTRUCT = 1.
<DMC_RSREL>-IDENT = 1.
<DMC_RSREL>-DESCR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DMC_RSREL-VERSIO, sy-vline,
  WA_DMC_RSREL-CHNAM, sy-vline,
  WA_DMC_RSREL-CHANGEDATE, sy-vline,
  WA_DMC_RSREL-AUTHOR, sy-vline,
  WA_DMC_RSREL-CREATEDATE, sy-vline,
  WA_DMC_RSREL-R_CARD, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DMC_RSREL 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_DMC_RSREL 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_DMC_RSREL INTO WA_DMC_RSREL.


*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_DMC_RSREL_STR, 
GUID TYPE STRING,
RSTRUCT TYPE STRING,
SSTRUCT TYPE STRING,
IDENT TYPE STRING,
DESCR TYPE STRING,
VERSIO TYPE STRING,
CHNAM TYPE STRING,
CHANGEDATE TYPE STRING,
AUTHOR TYPE STRING,
CREATEDATE TYPE STRING,
R_CARD TYPE STRING,
S_CARD TYPE STRING,
DPTYPE TYPE STRING,
PRIMREL TYPE STRING,
RELTYPE TYPE STRING,
CURRNUM TYPE STRING,
BOL TYPE STRING,
BOR TYPE STRING,
AL TYPE STRING,
EOR TYPE STRING,
EXTREL TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DMC_RSREL_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_DMC_RSREL_STR-GUID sy-vline 
WA_DMC_RSREL_STR-RSTRUCT sy-vline 
WA_DMC_RSREL_STR-SSTRUCT sy-vline 
WA_DMC_RSREL_STR-IDENT sy-vline 
WA_DMC_RSREL_STR-DESCR sy-vline 
WA_DMC_RSREL_STR-VERSIO sy-vline 
WA_DMC_RSREL_STR-CHNAM sy-vline 
WA_DMC_RSREL_STR-CHANGEDATE sy-vline 
WA_DMC_RSREL_STR-AUTHOR sy-vline 
WA_DMC_RSREL_STR-CREATEDATE sy-vline 
WA_DMC_RSREL_STR-R_CARD sy-vline 
WA_DMC_RSREL_STR-S_CARD sy-vline 
WA_DMC_RSREL_STR-DPTYPE sy-vline 
WA_DMC_RSREL_STR-PRIMREL sy-vline 
WA_DMC_RSREL_STR-RELTYPE sy-vline 
WA_DMC_RSREL_STR-CURRNUM sy-vline 
WA_DMC_RSREL_STR-BOL sy-vline 
WA_DMC_RSREL_STR-BOR sy-vline 
WA_DMC_RSREL_STR-AL sy-vline 
WA_DMC_RSREL_STR-EOR sy-vline 
WA_DMC_RSREL_STR-EXTREL sy-vline      INTO ld_text SEPARATED BY SPACE.

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