ABAP Select data from SAP table RNWP_PREREG_PATIENT_LIST into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RNWP_PREREG_PATIENT_LIST
*  INTO TABLE @DATA(IT_RNWP_PREREG_PATIENT_LIST2).
*--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_RNWP_PREREG_PATIENT_LIST INDEX 1 INTO DATA(WA_RNWP_PREREG_PATIENT_LIST2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RNWP_PREREG_PATIENT_LIST>-VKGID = 1.
<RNWP_PREREG_PATIENT_LIST>-PRTID = 1.
<RNWP_PREREG_PATIENT_LIST>-PRTNM = 1.
<RNWP_PREREG_PATIENT_LIST>-PNAMEC = 1.
<RNWP_PREREG_PATIENT_LIST>-PNAMEC1 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RNWP_PREREG_PATIENT_LIST-GSCHLE, sy-vline,
  WA_RNWP_PREREG_PATIENT_LIST-AGEPAT, sy-vline,
  WA_RNWP_PREREG_PATIENT_LIST-PAPID, sy-vline,
  WA_RNWP_PREREG_PATIENT_LIST-PATNR, sy-vline,
  WA_RNWP_PREREG_PATIENT_LIST-PZIFF, sy-vline,
  WA_RNWP_PREREG_PATIENT_LIST-EXTNR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RNWP_PREREG_PATIENT_LIST 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_RNWP_PREREG_PATIENT_LIST 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_RNWP_PREREG_PATIENT_LIST INTO WA_RNWP_PREREG_PATIENT_LIST.


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

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

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

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

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

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

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

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

*Conversion exit ALPHA, internal->external for field EUGPA
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNWP_PREREG_PATIENT_LIST-EUGPA
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNWP_PREREG_PATIENT_LIST-EUGPA.
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_RNWP_PREREG_PATIENT_LIST_STR, 
VKGID TYPE STRING,
PRTID TYPE STRING,
PRTNM TYPE STRING,
PNAMEC TYPE STRING,
PNAMEC1 TYPE STRING,
GSCHLE TYPE STRING,
AGEPAT TYPE STRING,
PAPID TYPE STRING,
PATNR TYPE STRING,
PZIFF TYPE STRING,
EXTNR TYPE STRING,
FALNR TYPE STRING,
FZIFF TYPE STRING,
FALAR TYPE STRING,
FALARE TYPE STRING,
NNAME TYPE STRING,
VNAME TYPE STRING,
NNAMS TYPE STRING,
VNAMS TYPE STRING,
GBNAM TYPE STRING,
GBNAMS TYPE STRING,
GBDAT TYPE STRING,
TELNR TYPE STRING,
PVPAT TYPE STRING,
PRIVP_ICON TYPE STRING,
ORGFA TYPE STRING,
ORGFAKB TYPE STRING,
ETROE TYPE STRING,
ETRMA TYPE STRING,
ETRMANA TYPE STRING,
KANAM TYPE STRING,
KALTX TYPE STRING,
DITXT TYPE STRING,
DILTX TYPE STRING,
WUZPE TYPE STRING,
WZRFG TYPE STRING,
WUMNT TYPE STRING,
WUJHR TYPE STRING,
BMVKG TYPE STRING,
BMLTX TYPE STRING,
EXTKH TYPE STRING,
EXNAM TYPE STRING,
HARNR TYPE STRING,
HANAM TYPE STRING,
EUGPA TYPE STRING,
EUGPN TYPE STRING,
USER1 TYPE STRING,
USER2 TYPE STRING,
USER3 TYPE STRING,
USER4 TYPE STRING,
USER5 TYPE STRING,
USER6 TYPE STRING,
USER7 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RNWP_PREREG_PATIENT_LIST_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_RNWP_PREREG_PATIENT_LIST_STR-VKGID sy-vline 
WA_RNWP_PREREG_PATIENT_LIST_STR-PRTID sy-vline 
WA_RNWP_PREREG_PATIENT_LIST_STR-PRTNM sy-vline 
WA_RNWP_PREREG_PATIENT_LIST_STR-PNAMEC sy-vline 
WA_RNWP_PREREG_PATIENT_LIST_STR-PNAMEC1 sy-vline 
WA_RNWP_PREREG_PATIENT_LIST_STR-GSCHLE sy-vline 
WA_RNWP_PREREG_PATIENT_LIST_STR-AGEPAT sy-vline 
WA_RNWP_PREREG_PATIENT_LIST_STR-PAPID sy-vline 
WA_RNWP_PREREG_PATIENT_LIST_STR-PATNR sy-vline 
WA_RNWP_PREREG_PATIENT_LIST_STR-PZIFF sy-vline 
WA_RNWP_PREREG_PATIENT_LIST_STR-EXTNR sy-vline 
WA_RNWP_PREREG_PATIENT_LIST_STR-FALNR sy-vline 
WA_RNWP_PREREG_PATIENT_LIST_STR-FZIFF sy-vline 
WA_RNWP_PREREG_PATIENT_LIST_STR-FALAR sy-vline 
WA_RNWP_PREREG_PATIENT_LIST_STR-FALARE sy-vline 
WA_RNWP_PREREG_PATIENT_LIST_STR-NNAME sy-vline 
WA_RNWP_PREREG_PATIENT_LIST_STR-VNAME sy-vline 
WA_RNWP_PREREG_PATIENT_LIST_STR-NNAMS sy-vline 
WA_RNWP_PREREG_PATIENT_LIST_STR-VNAMS sy-vline 
WA_RNWP_PREREG_PATIENT_LIST_STR-GBNAM sy-vline 
WA_RNWP_PREREG_PATIENT_LIST_STR-GBNAMS sy-vline 
WA_RNWP_PREREG_PATIENT_LIST_STR-GBDAT sy-vline 
WA_RNWP_PREREG_PATIENT_LIST_STR-TELNR sy-vline 
WA_RNWP_PREREG_PATIENT_LIST_STR-PVPAT sy-vline 
WA_RNWP_PREREG_PATIENT_LIST_STR-PRIVP_ICON sy-vline 
WA_RNWP_PREREG_PATIENT_LIST_STR-ORGFA sy-vline 
WA_RNWP_PREREG_PATIENT_LIST_STR-ORGFAKB sy-vline 
WA_RNWP_PREREG_PATIENT_LIST_STR-ETROE sy-vline 
WA_RNWP_PREREG_PATIENT_LIST_STR-ETRMA sy-vline 
WA_RNWP_PREREG_PATIENT_LIST_STR-ETRMANA sy-vline 
WA_RNWP_PREREG_PATIENT_LIST_STR-KANAM sy-vline 
WA_RNWP_PREREG_PATIENT_LIST_STR-KALTX sy-vline 
WA_RNWP_PREREG_PATIENT_LIST_STR-DITXT sy-vline 
WA_RNWP_PREREG_PATIENT_LIST_STR-DILTX sy-vline 
WA_RNWP_PREREG_PATIENT_LIST_STR-WUZPE sy-vline 
WA_RNWP_PREREG_PATIENT_LIST_STR-WZRFG sy-vline 
WA_RNWP_PREREG_PATIENT_LIST_STR-WUMNT sy-vline 
WA_RNWP_PREREG_PATIENT_LIST_STR-WUJHR sy-vline 
WA_RNWP_PREREG_PATIENT_LIST_STR-BMVKG sy-vline 
WA_RNWP_PREREG_PATIENT_LIST_STR-BMLTX sy-vline 
WA_RNWP_PREREG_PATIENT_LIST_STR-EXTKH sy-vline 
WA_RNWP_PREREG_PATIENT_LIST_STR-EXNAM sy-vline 
WA_RNWP_PREREG_PATIENT_LIST_STR-HARNR sy-vline 
WA_RNWP_PREREG_PATIENT_LIST_STR-HANAM sy-vline 
WA_RNWP_PREREG_PATIENT_LIST_STR-EUGPA sy-vline 
WA_RNWP_PREREG_PATIENT_LIST_STR-EUGPN sy-vline 
WA_RNWP_PREREG_PATIENT_LIST_STR-USER1 sy-vline 
WA_RNWP_PREREG_PATIENT_LIST_STR-USER2 sy-vline 
WA_RNWP_PREREG_PATIENT_LIST_STR-USER3 sy-vline 
WA_RNWP_PREREG_PATIENT_LIST_STR-USER4 sy-vline 
WA_RNWP_PREREG_PATIENT_LIST_STR-USER5 sy-vline 
WA_RNWP_PREREG_PATIENT_LIST_STR-USER6 sy-vline 
WA_RNWP_PREREG_PATIENT_LIST_STR-USER7 sy-vline      INTO ld_text SEPARATED BY SPACE.

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