ABAP Select data from SAP table RNLBTAG into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RNLBTAG
*  INTO TABLE @DATA(IT_RNLBTAG2).
*--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_RNLBTAG INDEX 1 INTO DATA(WA_RNLBTAG2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RNLBTAG>-FALNR = 1.
<RNLBTAG>-FZIFF = 1.
<RNLBTAG>-AUFNTG = 1.
<RNLBTAG>-ENTLTG = 1.
<RNLBTAG>-ANZ_TG = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RNLBTAG-ANZ_PFTG, sy-vline,
  WA_RNLBTAG-ANZ_ABTL, sy-vline,
  WA_RNLBTAG-ANZ_BAS, sy-vline,
  WA_RNLBTAG-ANZ_SE, sy-vline,
  WA_RNLBTAG-ANZ_SEO, sy-vline,
  WA_RNLBTAG-SUM_SE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RNLBTAG 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_RNLBTAG 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_RNLBTAG INTO WA_RNLBTAG.


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

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

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

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

*Conversion exit ALPHA, internal->external for field PATNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNLBTAG-PATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNLBTAG-PATNR.
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_RNLBTAG_STR, 
FALNR TYPE STRING,
FZIFF TYPE STRING,
AUFNTG TYPE STRING,
ENTLTG TYPE STRING,
ANZ_TG TYPE STRING,
ANZ_PFTG TYPE STRING,
ANZ_ABTL TYPE STRING,
ANZ_BAS TYPE STRING,
ANZ_SE TYPE STRING,
ANZ_SEO TYPE STRING,
SUM_SE TYPE STRING,
GES_SE TYPE STRING,
SEID TYPE STRING,
ANZ_FP TYPE STRING,
SUM_FP TYPE STRING,
FPID TYPE STRING,
GVD TYPE STRING,
SUM_VBP TYPE STRING,
SUM_NBP TYPE STRING,
ABGL TYPE STRING,
ALTER TYPE STRING,
FPNS TYPE STRING,
GVDNS TYPE STRING,
FPNSBG TYPE STRING,
PATNR TYPE STRING,
FALAR TYPE STRING,
FPEDT TYPE STRING,
ABRKZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RNLBTAG_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_RNLBTAG_STR-FALNR sy-vline 
WA_RNLBTAG_STR-FZIFF sy-vline 
WA_RNLBTAG_STR-AUFNTG sy-vline 
WA_RNLBTAG_STR-ENTLTG sy-vline 
WA_RNLBTAG_STR-ANZ_TG sy-vline 
WA_RNLBTAG_STR-ANZ_PFTG sy-vline 
WA_RNLBTAG_STR-ANZ_ABTL sy-vline 
WA_RNLBTAG_STR-ANZ_BAS sy-vline 
WA_RNLBTAG_STR-ANZ_SE sy-vline 
WA_RNLBTAG_STR-ANZ_SEO sy-vline 
WA_RNLBTAG_STR-SUM_SE sy-vline 
WA_RNLBTAG_STR-GES_SE sy-vline 
WA_RNLBTAG_STR-SEID sy-vline 
WA_RNLBTAG_STR-ANZ_FP sy-vline 
WA_RNLBTAG_STR-SUM_FP sy-vline 
WA_RNLBTAG_STR-FPID sy-vline 
WA_RNLBTAG_STR-GVD sy-vline 
WA_RNLBTAG_STR-SUM_VBP sy-vline 
WA_RNLBTAG_STR-SUM_NBP sy-vline 
WA_RNLBTAG_STR-ABGL sy-vline 
WA_RNLBTAG_STR-ALTER sy-vline 
WA_RNLBTAG_STR-FPNS sy-vline 
WA_RNLBTAG_STR-GVDNS sy-vline 
WA_RNLBTAG_STR-FPNSBG sy-vline 
WA_RNLBTAG_STR-PATNR sy-vline 
WA_RNLBTAG_STR-FALAR sy-vline 
WA_RNLBTAG_STR-FPEDT sy-vline 
WA_RNLBTAG_STR-ABRKZ sy-vline      INTO ld_text SEPARATED BY SPACE.

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