ABAP Select data from SAP table RNWP_CARE_UNIT_LIST_HEAD into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RNWP_CARE_UNIT_LIST_HEAD 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_CARE_UNIT_LIST_HEAD. 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_CARE_UNIT_LIST_HEAD 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_CARE_UNIT_LIST_HEAD TYPE STANDARD TABLE OF RNWP_CARE_UNIT_LIST_HEAD,
      WA_RNWP_CARE_UNIT_LIST_HEAD TYPE RNWP_CARE_UNIT_LIST_HEAD,
      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_CARE_UNIT_LIST_HEAD> TYPE RNWP_CARE_UNIT_LIST_HEAD.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RNWP_CARE_UNIT_LIST_HEAD
*  INTO TABLE @DATA(IT_RNWP_CARE_UNIT_LIST_HEAD2).
*--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_CARE_UNIT_LIST_HEAD INDEX 1 INTO DATA(WA_RNWP_CARE_UNIT_LIST_HEAD2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RNWP_CARE_UNIT_LIST_HEAD>-MANDT = 1.
<RNWP_CARE_UNIT_LIST_HEAD>-EINRI = 1.
<RNWP_CARE_UNIT_LIST_HEAD>-PATNR = 1.
<RNWP_CARE_UNIT_LIST_HEAD>-PAPID = 1.
<RNWP_CARE_UNIT_LIST_HEAD>-FALNR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RNWP_CARE_UNIT_LIST_HEAD-LFDNR, sy-vline,
  WA_RNWP_CARE_UNIT_LIST_HEAD-VKGID, sy-vline,
  WA_RNWP_CARE_UNIT_LIST_HEAD-TMNID, sy-vline,
  WA_RNWP_CARE_UNIT_LIST_HEAD-ORGFA, sy-vline,
  WA_RNWP_CARE_UNIT_LIST_HEAD-ORGPF, sy-vline,
  WA_RNWP_CARE_UNIT_LIST_HEAD-LISTKZ, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RNWP_CARE_UNIT_LIST_HEAD 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_CARE_UNIT_LIST_HEAD 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_CARE_UNIT_LIST_HEAD INTO WA_RNWP_CARE_UNIT_LIST_HEAD.


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

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

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

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

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

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

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

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

*Conversion exit ALPHA, internal->external for field BETT_MARK
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNWP_CARE_UNIT_LIST_HEAD-BETT_MARK
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNWP_CARE_UNIT_LIST_HEAD-BETT_MARK.
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_CARE_UNIT_LIST_HEAD_STR, 
MANDT TYPE STRING,
EINRI TYPE STRING,
PATNR TYPE STRING,
PAPID TYPE STRING,
FALNR TYPE STRING,
LFDNR TYPE STRING,
VKGID TYPE STRING,
TMNID TYPE STRING,
ORGFA TYPE STRING,
ORGPF TYPE STRING,
LISTKZ TYPE STRING,
LFDNR_DIA TYPE STRING,
ZIMMR_MARK TYPE STRING,
BETT_MARK TYPE STRING,
DATE_MARK TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RNWP_CARE_UNIT_LIST_HEAD_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_CARE_UNIT_LIST_HEAD_STR-MANDT sy-vline 
WA_RNWP_CARE_UNIT_LIST_HEAD_STR-EINRI sy-vline 
WA_RNWP_CARE_UNIT_LIST_HEAD_STR-PATNR sy-vline 
WA_RNWP_CARE_UNIT_LIST_HEAD_STR-PAPID sy-vline 
WA_RNWP_CARE_UNIT_LIST_HEAD_STR-FALNR sy-vline 
WA_RNWP_CARE_UNIT_LIST_HEAD_STR-LFDNR sy-vline 
WA_RNWP_CARE_UNIT_LIST_HEAD_STR-VKGID sy-vline 
WA_RNWP_CARE_UNIT_LIST_HEAD_STR-TMNID sy-vline 
WA_RNWP_CARE_UNIT_LIST_HEAD_STR-ORGFA sy-vline 
WA_RNWP_CARE_UNIT_LIST_HEAD_STR-ORGPF sy-vline 
WA_RNWP_CARE_UNIT_LIST_HEAD_STR-LISTKZ sy-vline 
WA_RNWP_CARE_UNIT_LIST_HEAD_STR-LFDNR_DIA sy-vline 
WA_RNWP_CARE_UNIT_LIST_HEAD_STR-ZIMMR_MARK sy-vline 
WA_RNWP_CARE_UNIT_LIST_HEAD_STR-BETT_MARK sy-vline 
WA_RNWP_CARE_UNIT_LIST_HEAD_STR-DATE_MARK sy-vline      INTO ld_text SEPARATED BY SPACE.

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