ABAP Select data from SAP table RERED_2 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RERED_2 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_2. 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_2 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_2 TYPE STANDARD TABLE OF RERED_2,
      WA_RERED_2 TYPE RERED_2,
      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_2> TYPE RERED_2.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RERED_2.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RERED_2
  INTO TABLE IT_RERED_2.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RERED_2
*  INTO TABLE @DATA(IT_RERED_22).
*--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_2 INDEX 1 INTO DATA(WA_RERED_22).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RERED_2 ASSIGNING <RERED_2>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RERED_2>-WAERS_KOKRS = 1.
<RERED_2>-GESKOS_GE_VO = 1.
<RERED_2>-GESKOS_GE_NA = 1.
<RERED_2>-INVKOS_GE_VO = 1.
<RERED_2>-INVKOS_GE_NA = 1.

ENDLOOP.

LOOP AT IT_RERED_2 INTO WA_RERED_2.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RERED_2-GESKOS_JA_4_VO, sy-vline,
  WA_RERED_2-GESKOS_JA_4_NA, sy-vline,
  WA_RERED_2-INVKOS_JA_4_VO, sy-vline,
  WA_RERED_2-INVKOS_JA_4_NA, sy-vline,
  WA_RERED_2-GESKOS_JA_3_VO, sy-vline,
  WA_RERED_2-GESKOS_JA_3_NA, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RERED_2 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_2 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_2 INTO WA_RERED_2.


*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_RERED_2_STR, 
WAERS_KOKRS TYPE STRING,
GESKOS_GE_VO TYPE STRING,
GESKOS_GE_NA TYPE STRING,
INVKOS_GE_VO TYPE STRING,
INVKOS_GE_NA TYPE STRING,
GESKOS_JA_4_VO TYPE STRING,
GESKOS_JA_4_NA TYPE STRING,
INVKOS_JA_4_VO TYPE STRING,
INVKOS_JA_4_NA TYPE STRING,
GESKOS_JA_3_VO TYPE STRING,
GESKOS_JA_3_NA TYPE STRING,
INVKOS_JA_3_VO TYPE STRING,
INVKOS_JA_3_NA TYPE STRING,
GESKOS_JA_2_VO TYPE STRING,
GESKOS_JA_2_NA TYPE STRING,
INVKOS_JA_2_VO TYPE STRING,
INVKOS_JA_2_NA TYPE STRING,
GESKOS_JA_1_VO TYPE STRING,
GESKOS_JA_1_NA TYPE STRING,
INVKOS_JA_1_VO TYPE STRING,
INVKOS_JA_1_NA TYPE STRING,
GESKOS_JA0_VO TYPE STRING,
GESKOS_JA0_NA TYPE STRING,
INVKOS_JA0_VO TYPE STRING,
INVKOS_JA0_NA TYPE STRING,
GESKOS_JA1_VO TYPE STRING,
GESKOS_JA1_NA TYPE STRING,
INVKOS_JA1_VO TYPE STRING,
INVKOS_JA1_NA TYPE STRING,
GESKOS_JA2_VO TYPE STRING,
GESKOS_JA2_NA TYPE STRING,
INVKOS_JA2_VO TYPE STRING,
INVKOS_JA2_NA TYPE STRING,
GESKOS_JA3_VO TYPE STRING,
GESKOS_JA3_NA TYPE STRING,
INVKOS_JA3_VO TYPE STRING,
INVKOS_JA3_NA TYPE STRING,
GESKOS_JA4_VO TYPE STRING,
GESKOS_JA4_NA TYPE STRING,
INVKOS_JA4_VO TYPE STRING,
INVKOS_JA4_NA TYPE STRING,
GESKOS_JA5_VO TYPE STRING,
GESKOS_JA5_NA TYPE STRING,
INVKOS_JA5_VO TYPE STRING,
INVKOS_JA5_NA TYPE STRING,
GESKOS_JA6_VO TYPE STRING,
GESKOS_JA6_NA TYPE STRING,
INVKOS_JA6_VO TYPE STRING,
INVKOS_JA6_NA TYPE STRING,
GESKOS_JA7_VO TYPE STRING,
GESKOS_JA7_NA TYPE STRING,
INVKOS_JA7_VO TYPE STRING,
INVKOS_JA7_NA TYPE STRING,
GESKOS_JA8_VO TYPE STRING,
GESKOS_JA8_NA TYPE STRING,
INVKOS_JA8_VO TYPE STRING,
INVKOS_JA8_NA TYPE STRING,
GESKOS_JA9_VO TYPE STRING,
GESKOS_JA9_NA TYPE STRING,
INVKOS_JA9_VO TYPE STRING,
INVKOS_JA9_NA TYPE STRING,
GESKOS_JA10_VO TYPE STRING,
GESKOS_JA10_NA TYPE STRING,
INVKOS_JA10_VO TYPE STRING,
INVKOS_JA10_NA TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RERED_2_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_2_STR-WAERS_KOKRS sy-vline 
WA_RERED_2_STR-GESKOS_GE_VO sy-vline 
WA_RERED_2_STR-GESKOS_GE_NA sy-vline 
WA_RERED_2_STR-INVKOS_GE_VO sy-vline 
WA_RERED_2_STR-INVKOS_GE_NA sy-vline 
WA_RERED_2_STR-GESKOS_JA_4_VO sy-vline 
WA_RERED_2_STR-GESKOS_JA_4_NA sy-vline 
WA_RERED_2_STR-INVKOS_JA_4_VO sy-vline 
WA_RERED_2_STR-INVKOS_JA_4_NA sy-vline 
WA_RERED_2_STR-GESKOS_JA_3_VO sy-vline 
WA_RERED_2_STR-GESKOS_JA_3_NA sy-vline 
WA_RERED_2_STR-INVKOS_JA_3_VO sy-vline 
WA_RERED_2_STR-INVKOS_JA_3_NA sy-vline 
WA_RERED_2_STR-GESKOS_JA_2_VO sy-vline 
WA_RERED_2_STR-GESKOS_JA_2_NA sy-vline 
WA_RERED_2_STR-INVKOS_JA_2_VO sy-vline 
WA_RERED_2_STR-INVKOS_JA_2_NA sy-vline 
WA_RERED_2_STR-GESKOS_JA_1_VO sy-vline 
WA_RERED_2_STR-GESKOS_JA_1_NA sy-vline 
WA_RERED_2_STR-INVKOS_JA_1_VO sy-vline 
WA_RERED_2_STR-INVKOS_JA_1_NA sy-vline 
WA_RERED_2_STR-GESKOS_JA0_VO sy-vline 
WA_RERED_2_STR-GESKOS_JA0_NA sy-vline 
WA_RERED_2_STR-INVKOS_JA0_VO sy-vline 
WA_RERED_2_STR-INVKOS_JA0_NA sy-vline 
WA_RERED_2_STR-GESKOS_JA1_VO sy-vline 
WA_RERED_2_STR-GESKOS_JA1_NA sy-vline 
WA_RERED_2_STR-INVKOS_JA1_VO sy-vline 
WA_RERED_2_STR-INVKOS_JA1_NA sy-vline 
WA_RERED_2_STR-GESKOS_JA2_VO sy-vline 
WA_RERED_2_STR-GESKOS_JA2_NA sy-vline 
WA_RERED_2_STR-INVKOS_JA2_VO sy-vline 
WA_RERED_2_STR-INVKOS_JA2_NA sy-vline 
WA_RERED_2_STR-GESKOS_JA3_VO sy-vline 
WA_RERED_2_STR-GESKOS_JA3_NA sy-vline 
WA_RERED_2_STR-INVKOS_JA3_VO sy-vline 
WA_RERED_2_STR-INVKOS_JA3_NA sy-vline 
WA_RERED_2_STR-GESKOS_JA4_VO sy-vline 
WA_RERED_2_STR-GESKOS_JA4_NA sy-vline 
WA_RERED_2_STR-INVKOS_JA4_VO sy-vline 
WA_RERED_2_STR-INVKOS_JA4_NA sy-vline 
WA_RERED_2_STR-GESKOS_JA5_VO sy-vline 
WA_RERED_2_STR-GESKOS_JA5_NA sy-vline 
WA_RERED_2_STR-INVKOS_JA5_VO sy-vline 
WA_RERED_2_STR-INVKOS_JA5_NA sy-vline 
WA_RERED_2_STR-GESKOS_JA6_VO sy-vline 
WA_RERED_2_STR-GESKOS_JA6_NA sy-vline 
WA_RERED_2_STR-INVKOS_JA6_VO sy-vline 
WA_RERED_2_STR-INVKOS_JA6_NA sy-vline 
WA_RERED_2_STR-GESKOS_JA7_VO sy-vline 
WA_RERED_2_STR-GESKOS_JA7_NA sy-vline 
WA_RERED_2_STR-INVKOS_JA7_VO sy-vline 
WA_RERED_2_STR-INVKOS_JA7_NA sy-vline 
WA_RERED_2_STR-GESKOS_JA8_VO sy-vline 
WA_RERED_2_STR-GESKOS_JA8_NA sy-vline 
WA_RERED_2_STR-INVKOS_JA8_VO sy-vline 
WA_RERED_2_STR-INVKOS_JA8_NA sy-vline 
WA_RERED_2_STR-GESKOS_JA9_VO sy-vline 
WA_RERED_2_STR-GESKOS_JA9_NA sy-vline 
WA_RERED_2_STR-INVKOS_JA9_VO sy-vline 
WA_RERED_2_STR-INVKOS_JA9_NA sy-vline 
WA_RERED_2_STR-GESKOS_JA10_VO sy-vline 
WA_RERED_2_STR-GESKOS_JA10_NA sy-vline 
WA_RERED_2_STR-INVKOS_JA10_VO sy-vline 
WA_RERED_2_STR-INVKOS_JA10_NA sy-vline      INTO ld_text SEPARATED BY SPACE.

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