ABAP Select data from SAP table RNPB3 into internal table

Get Example source ABAP code based on a different SAP table
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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RNPB3 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 RNPB3. 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 RNPB3 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_RNPB3 TYPE STANDARD TABLE OF RNPB3,
      WA_RNPB3 TYPE RNPB3,
      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: <RNPB3> TYPE RNPB3.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RNPB3.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RNPB3
  INTO TABLE IT_RNPB3.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RNPB3
*  INTO TABLE @DATA(IT_RNPB32).
*--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_RNPB3 INDEX 1 INTO DATA(WA_RNPB32).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RNPB3 ASSIGNING <RNPB3>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RNPB3>-INSTITUTION = 1.
<RNPB3>-INST_TXT = 1.
<RNPB3>-SPECIALITY = 1.
<RNPB3>-SPEC_TXT = 1.
<RNPB3>-SPECIALITY_ORG = 1.

ENDLOOP.

LOOP AT IT_RNPB3 INTO WA_RNPB3.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RNPB3-START_DATE, sy-vline,
  WA_RNPB3-MON_AM_EXCL, sy-vline,
  WA_RNPB3-MON_PM_EXCL, sy-vline,
  WA_RNPB3-TUE_AM_EXCL, sy-vline,
  WA_RNPB3-TUE_PM_EXCL, sy-vline,
  WA_RNPB3-WED_AM_EXCL, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RNPB3 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_RNPB3 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_RNPB3 INTO WA_RNPB3.


*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 INSTITUTION
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNPB3-INSTITUTION
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNPB3-INSTITUTION.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field SPECIALITY
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNPB3-SPECIALITY
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNPB3-SPECIALITY.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field SPECIALITY_ORG
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNPB3-SPECIALITY_ORG
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNPB3-SPECIALITY_ORG.
WRITE:/ 'New Value:', ld_input.

*Conversion exit SXIDN, internal->external for field EMAIL
CALL FUNCTION 'CONVERSION_EXIT_SXIDN_OUTPUT'
  EXPORTING
    input =                      WA_RNPB3-EMAIL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNPB3-EMAIL.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field PATNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNPB3-PATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNPB3-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_RNPB3_STR, 
INSTITUTION TYPE STRING,
INST_TXT TYPE STRING,
SPECIALITY TYPE STRING,
SPEC_TXT TYPE STRING,
SPECIALITY_ORG TYPE STRING,
START_DATE TYPE STRING,
MON_AM_EXCL TYPE STRING,
MON_PM_EXCL TYPE STRING,
TUE_AM_EXCL TYPE STRING,
TUE_PM_EXCL TYPE STRING,
WED_AM_EXCL TYPE STRING,
WED_PM_EXCL TYPE STRING,
THU_AM_EXCL TYPE STRING,
THU_PM_EXCL TYPE STRING,
FRI_AM_EXCL TYPE STRING,
FRI_PM_EXCL TYPE STRING,
SAT_AM_EXCL TYPE STRING,
SAT_PM_EXCL TYPE STRING,
SUN_AM_EXCL TYPE STRING,
SUN_PM_EXCL TYPE STRING,
APPOINT_NO TYPE STRING,
NNAME TYPE STRING,
VNAME TYPE STRING,
GBDAT TYPE STRING,
GSCHL TYPE STRING,
TELF1 TYPE STRING,
KZTXT TYPE STRING,
GSCHLE TYPE STRING,
EMAIL TYPE STRING,
PATNR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RNPB3_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_RNPB3_STR-INSTITUTION sy-vline 
WA_RNPB3_STR-INST_TXT sy-vline 
WA_RNPB3_STR-SPECIALITY sy-vline 
WA_RNPB3_STR-SPEC_TXT sy-vline 
WA_RNPB3_STR-SPECIALITY_ORG sy-vline 
WA_RNPB3_STR-START_DATE sy-vline 
WA_RNPB3_STR-MON_AM_EXCL sy-vline 
WA_RNPB3_STR-MON_PM_EXCL sy-vline 
WA_RNPB3_STR-TUE_AM_EXCL sy-vline 
WA_RNPB3_STR-TUE_PM_EXCL sy-vline 
WA_RNPB3_STR-WED_AM_EXCL sy-vline 
WA_RNPB3_STR-WED_PM_EXCL sy-vline 
WA_RNPB3_STR-THU_AM_EXCL sy-vline 
WA_RNPB3_STR-THU_PM_EXCL sy-vline 
WA_RNPB3_STR-FRI_AM_EXCL sy-vline 
WA_RNPB3_STR-FRI_PM_EXCL sy-vline 
WA_RNPB3_STR-SAT_AM_EXCL sy-vline 
WA_RNPB3_STR-SAT_PM_EXCL sy-vline 
WA_RNPB3_STR-SUN_AM_EXCL sy-vline 
WA_RNPB3_STR-SUN_PM_EXCL sy-vline 
WA_RNPB3_STR-APPOINT_NO sy-vline 
WA_RNPB3_STR-NNAME sy-vline 
WA_RNPB3_STR-VNAME sy-vline 
WA_RNPB3_STR-GBDAT sy-vline 
WA_RNPB3_STR-GSCHL sy-vline 
WA_RNPB3_STR-TELF1 sy-vline 
WA_RNPB3_STR-KZTXT sy-vline 
WA_RNPB3_STR-GSCHLE sy-vline 
WA_RNPB3_STR-EMAIL sy-vline 
WA_RNPB3_STR-PATNR sy-vline      INTO ld_text SEPARATED BY SPACE.

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