ABAP Select data from SAP table RERED_1 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RERED_1 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 RERED_1. 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 RERED_1 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_RERED_1 TYPE STANDARD TABLE OF RERED_1,
      WA_RERED_1 TYPE RERED_1,
      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: <RERED_1> TYPE RERED_1.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RERED_1.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RERED_1
  INTO TABLE IT_RERED_1.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RERED_1
*  INTO TABLE @DATA(IT_RERED_12).
*--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_RERED_1 INDEX 1 INTO DATA(WA_RERED_12).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RERED_1 ASSIGNING <RERED_1>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RERED_1>-POSNR = 1.
<RERED_1>-POSID = 1.
<RERED_1>-OBJNR = 1.
<RERED_1>-TXT50 = 1.
<RERED_1>-VARNT = 1.

ENDLOOP.

LOOP AT IT_RERED_1 INTO WA_RERED_1.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RERED_1-TXV50, sy-vline,
  WA_RERED_1-GJAHR, sy-vline,
  WA_RERED_1-ABUKRS, sy-vline,
  WA_RERED_1-ARCOMP, sy-vline,
  WA_RERED_1-VKOKRS, sy-vline,
  WA_RERED_1-VBUKRS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RERED_1 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_RERED_1 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_RERED_1 INTO WA_RERED_1.


*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 REQNR, internal->external for field POSNR
CALL FUNCTION 'CONVERSION_EXIT_REQNR_OUTPUT'
  EXPORTING
    input =                      WA_RERED_1-POSNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RERED_1-POSNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit REQID, internal->external for field POSID
CALL FUNCTION 'CONVERSION_EXIT_REQID_OUTPUT'
  EXPORTING
    input =                      WA_RERED_1-POSID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RERED_1-POSID.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field VARNT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RERED_1-VARNT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RERED_1-VARNT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GJAHR, internal->external for field GJAHR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_RERED_1-GJAHR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RERED_1-GJAHR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ARCOMP
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RERED_1-ARCOMP
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RERED_1-ARCOMP.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field VPRCTR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RERED_1-VPRCTR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RERED_1-VPRCTR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field VKOSTL
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RERED_1-VKOSTL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RERED_1-VKOSTL.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field VRCOMP
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RERED_1-VRCOMP
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RERED_1-VRCOMP.
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_RERED_1_STR, 
POSNR TYPE STRING,
POSID TYPE STRING,
OBJNR TYPE STRING,
TXT50 TYPE STRING,
VARNT TYPE STRING,
TXV50 TYPE STRING,
GJAHR TYPE STRING,
ABUKRS TYPE STRING,
ARCOMP TYPE STRING,
VKOKRS TYPE STRING,
VBUKRS TYPE STRING,
VGSBER TYPE STRING,
VPRCTR TYPE STRING,
VKOSTL TYPE STRING,
VRCOMP TYPE STRING,
KALNR TYPE STRING,
WAERS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RERED_1_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_RERED_1_STR-POSNR sy-vline 
WA_RERED_1_STR-POSID sy-vline 
WA_RERED_1_STR-OBJNR sy-vline 
WA_RERED_1_STR-TXT50 sy-vline 
WA_RERED_1_STR-VARNT sy-vline 
WA_RERED_1_STR-TXV50 sy-vline 
WA_RERED_1_STR-GJAHR sy-vline 
WA_RERED_1_STR-ABUKRS sy-vline 
WA_RERED_1_STR-ARCOMP sy-vline 
WA_RERED_1_STR-VKOKRS sy-vline 
WA_RERED_1_STR-VBUKRS sy-vline 
WA_RERED_1_STR-VGSBER sy-vline 
WA_RERED_1_STR-VPRCTR sy-vline 
WA_RERED_1_STR-VKOSTL sy-vline 
WA_RERED_1_STR-VRCOMP sy-vline 
WA_RERED_1_STR-KALNR sy-vline 
WA_RERED_1_STR-WAERS sy-vline      INTO ld_text SEPARATED BY SPACE.

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