ABAP Select data from SAP table TRRLCG into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TRRLCG
*  INTO TABLE @DATA(IT_TRRLCG2).
*--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_TRRLCG INDEX 1 INTO DATA(WA_TRRLCG2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TRRLCG>-MANDT = 1.
<TRRLCG>-RRLCG = 1.
<TRRLCG>-RRLPR = 1.
<TRRLCG>-RRLBD = 1.
<TRRLCG>-RRLCAL = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TRRLCG-LFART_RL, sy-vline,
  WA_TRRLCG-CGTYPE, sy-vline,
  WA_TRRLCG-CREATERRL, sy-vline,
  WA_TRRLCG-SELECT_RRLCOND, sy-vline,
  WA_TRRLCG-SELECT_RRLREC, sy-vline,
  WA_TRRLCG-LFART_RL_CANCEL, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TRRLCG 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_TRRLCG 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_TRRLCG INTO WA_TRRLCG.


*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 RRLCG
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_TRRLCG-RRLCG
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TRRLCG-RRLCG.
WRITE:/ 'New Value:', ld_input.

*Conversion exit PARVW, internal->external for field RRLPR
CALL FUNCTION 'CONVERSION_EXIT_PARVW_OUTPUT'
  EXPORTING
    input =                      WA_TRRLCG-RRLPR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TRRLCG-RRLPR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field RRLREC_CG
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_TRRLCG-RRLREC_CG
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TRRLCG-RRLREC_CG.
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_TRRLCG_STR, 
MANDT TYPE STRING,
RRLCG TYPE STRING,
RRLPR TYPE STRING,
RRLBD TYPE STRING,
RRLCAL TYPE STRING,
LFART_RL TYPE STRING,
CGTYPE TYPE STRING,
CREATERRL TYPE STRING,
SELECT_RRLCOND TYPE STRING,
SELECT_RRLREC TYPE STRING,
LFART_RL_CANCEL TYPE STRING,
CANCEL_TYPE TYPE STRING,
SELECT_WAERL_RL TYPE STRING,
KURST_RL TYPE STRING,
SELECT_WKURS TYPE STRING,
RRLREC_CG TYPE STRING,
CANCEL_TYPE_WBRR TYPE STRING,
SELECT_ZTERM TYPE STRING,
ZTERM_CG TYPE STRING,
PRICING TYPE STRING,
PRICING_SCHEME TYPE STRING,
SELECT_WKURS_HW TYPE STRING,
COMPLETION_TYPE TYPE STRING,
SOURCE_DOCS TYPE STRING,
DUPLICATE_CHECK TYPE STRING,
IV_PROC_TYPE TYPE STRING,
IV_DETERM_TYPE TYPE STRING,
IV_ASSMNT_GROUP TYPE STRING,
IV_PROFORMA TYPE STRING,
IV_WRART_RK_IN TYPE STRING,
IV_WRART_RK_CM TYPE STRING,
IV_WRART_TD TYPE STRING,
IV_WRART_SD TYPE STRING,
IV_LFGRU_PA TYPE STRING,
IV_WRART_RST_PA TYPE STRING,
IV_RST_PA_COMPR TYPE STRING,
IV_WRART_RST_QC TYPE STRING,
IV_LFGRU_LA TYPE STRING,
IV_WRART_RST_LA TYPE STRING,
IV_WRART_RST_MC TYPE STRING,
IV_KTOSL TYPE STRING,
IV_LFGRU_RL_MAN TYPE STRING,
IV_LFGRU_RL_AUT TYPE STRING,
IV_AUTORELEASE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TRRLCG_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_TRRLCG_STR-MANDT sy-vline 
WA_TRRLCG_STR-RRLCG sy-vline 
WA_TRRLCG_STR-RRLPR sy-vline 
WA_TRRLCG_STR-RRLBD sy-vline 
WA_TRRLCG_STR-RRLCAL sy-vline 
WA_TRRLCG_STR-LFART_RL sy-vline 
WA_TRRLCG_STR-CGTYPE sy-vline 
WA_TRRLCG_STR-CREATERRL sy-vline 
WA_TRRLCG_STR-SELECT_RRLCOND sy-vline 
WA_TRRLCG_STR-SELECT_RRLREC sy-vline 
WA_TRRLCG_STR-LFART_RL_CANCEL sy-vline 
WA_TRRLCG_STR-CANCEL_TYPE sy-vline 
WA_TRRLCG_STR-SELECT_WAERL_RL sy-vline 
WA_TRRLCG_STR-KURST_RL sy-vline 
WA_TRRLCG_STR-SELECT_WKURS sy-vline 
WA_TRRLCG_STR-RRLREC_CG sy-vline 
WA_TRRLCG_STR-CANCEL_TYPE_WBRR sy-vline 
WA_TRRLCG_STR-SELECT_ZTERM sy-vline 
WA_TRRLCG_STR-ZTERM_CG sy-vline 
WA_TRRLCG_STR-PRICING sy-vline 
WA_TRRLCG_STR-PRICING_SCHEME sy-vline 
WA_TRRLCG_STR-SELECT_WKURS_HW sy-vline 
WA_TRRLCG_STR-COMPLETION_TYPE sy-vline 
WA_TRRLCG_STR-SOURCE_DOCS sy-vline 
WA_TRRLCG_STR-DUPLICATE_CHECK sy-vline 
WA_TRRLCG_STR-IV_PROC_TYPE sy-vline 
WA_TRRLCG_STR-IV_DETERM_TYPE sy-vline 
WA_TRRLCG_STR-IV_ASSMNT_GROUP sy-vline 
WA_TRRLCG_STR-IV_PROFORMA sy-vline 
WA_TRRLCG_STR-IV_WRART_RK_IN sy-vline 
WA_TRRLCG_STR-IV_WRART_RK_CM sy-vline 
WA_TRRLCG_STR-IV_WRART_TD sy-vline 
WA_TRRLCG_STR-IV_WRART_SD sy-vline 
WA_TRRLCG_STR-IV_LFGRU_PA sy-vline 
WA_TRRLCG_STR-IV_WRART_RST_PA sy-vline 
WA_TRRLCG_STR-IV_RST_PA_COMPR sy-vline 
WA_TRRLCG_STR-IV_WRART_RST_QC sy-vline 
WA_TRRLCG_STR-IV_LFGRU_LA sy-vline 
WA_TRRLCG_STR-IV_WRART_RST_LA sy-vline 
WA_TRRLCG_STR-IV_WRART_RST_MC sy-vline 
WA_TRRLCG_STR-IV_KTOSL sy-vline 
WA_TRRLCG_STR-IV_LFGRU_RL_MAN sy-vline 
WA_TRRLCG_STR-IV_LFGRU_RL_AUT sy-vline 
WA_TRRLCG_STR-IV_AUTORELEASE sy-vline      INTO ld_text SEPARATED BY SPACE.

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