ABAP Select data from SAP table RN1PO_DIAGNOSIS into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RN1PO_DIAGNOSIS 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 RN1PO_DIAGNOSIS. 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 RN1PO_DIAGNOSIS 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_RN1PO_DIAGNOSIS TYPE STANDARD TABLE OF RN1PO_DIAGNOSIS,
      WA_RN1PO_DIAGNOSIS TYPE RN1PO_DIAGNOSIS,
      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: <RN1PO_DIAGNOSIS> TYPE RN1PO_DIAGNOSIS.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RN1PO_DIAGNOSIS.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RN1PO_DIAGNOSIS
  INTO TABLE IT_RN1PO_DIAGNOSIS.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RN1PO_DIAGNOSIS
*  INTO TABLE @DATA(IT_RN1PO_DIAGNOSIS2).
*--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_RN1PO_DIAGNOSIS INDEX 1 INTO DATA(WA_RN1PO_DIAGNOSIS2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RN1PO_DIAGNOSIS ASSIGNING <RN1PO_DIAGNOSIS>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RN1PO_DIAGNOSIS>-MANDT = 1.
<RN1PO_DIAGNOSIS>-EINRI = 1.
<RN1PO_DIAGNOSIS>-FALNR = 1.
<RN1PO_DIAGNOSIS>-LFDNR = 1.
<RN1PO_DIAGNOSIS>-DKAT1 = 1.

ENDLOOP.

LOOP AT IT_RN1PO_DIAGNOSIS INTO WA_RN1PO_DIAGNOSIS.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RN1PO_DIAGNOSIS-DKEY1, sy-vline,
  WA_RN1PO_DIAGNOSIS-DKAT2, sy-vline,
  WA_RN1PO_DIAGNOSIS-DKEY2, sy-vline,
  WA_RN1PO_DIAGNOSIS-DITXT, sy-vline,
  WA_RN1PO_DIAGNOSIS-DILTX, sy-vline,
  WA_RN1PO_DIAGNOSIS-DIADT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RN1PO_DIAGNOSIS 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_RN1PO_DIAGNOSIS 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_RN1PO_DIAGNOSIS INTO WA_RN1PO_DIAGNOSIS.


*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_RN1PO_DIAGNOSIS-EINRI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RN1PO_DIAGNOSIS-EINRI.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field FALNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RN1PO_DIAGNOSIS-FALNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RN1PO_DIAGNOSIS-FALNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field DIAPE
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RN1PO_DIAGNOSIS-DIAPE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RN1PO_DIAGNOSIS-DIAPE.
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_RN1PO_DIAGNOSIS_STR, 
MANDT TYPE STRING,
EINRI TYPE STRING,
FALNR TYPE STRING,
LFDNR TYPE STRING,
DKAT1 TYPE STRING,
DKEY1 TYPE STRING,
DKAT2 TYPE STRING,
DKEY2 TYPE STRING,
DITXT TYPE STRING,
DILTX TYPE STRING,
DIADT TYPE STRING,
DIAZT TYPE STRING,
DIAPE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RN1PO_DIAGNOSIS_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_RN1PO_DIAGNOSIS_STR-MANDT sy-vline 
WA_RN1PO_DIAGNOSIS_STR-EINRI sy-vline 
WA_RN1PO_DIAGNOSIS_STR-FALNR sy-vline 
WA_RN1PO_DIAGNOSIS_STR-LFDNR sy-vline 
WA_RN1PO_DIAGNOSIS_STR-DKAT1 sy-vline 
WA_RN1PO_DIAGNOSIS_STR-DKEY1 sy-vline 
WA_RN1PO_DIAGNOSIS_STR-DKAT2 sy-vline 
WA_RN1PO_DIAGNOSIS_STR-DKEY2 sy-vline 
WA_RN1PO_DIAGNOSIS_STR-DITXT sy-vline 
WA_RN1PO_DIAGNOSIS_STR-DILTX sy-vline 
WA_RN1PO_DIAGNOSIS_STR-DIADT sy-vline 
WA_RN1PO_DIAGNOSIS_STR-DIAZT sy-vline 
WA_RN1PO_DIAGNOSIS_STR-DIAPE sy-vline      INTO ld_text SEPARATED BY SPACE.

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