ABAP Select data from SAP table RNWCH_PI_INQ_MULT_O into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RNWCH_PI_INQ_MULT_O
*  INTO TABLE @DATA(IT_RNWCH_PI_INQ_MULT_O2).
*--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_RNWCH_PI_INQ_MULT_O INDEX 1 INTO DATA(WA_RNWCH_PI_INQ_MULT_O2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RNWCH_PI_INQ_MULT_O>-INQUIRY_ID = 1.
<RNWCH_PI_INQ_MULT_O>-FALNR = 1.
<RNWCH_PI_INQ_MULT_O>-LFDNR = 1.
<RNWCH_PI_INQ_MULT_O>-QUERY_DATE = 1.
<RNWCH_PI_INQ_MULT_O>-CARDNR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RNWCH_PI_INQ_MULT_O-BEGDT, sy-vline,
  WA_RNWCH_PI_INQ_MULT_O-ENDDT, sy-vline,
  WA_RNWCH_PI_INQ_MULT_O-COV_BEGDT, sy-vline,
  WA_RNWCH_PI_INQ_MULT_O-COV_ENDDT, sy-vline,
  WA_RNWCH_PI_INQ_MULT_O-SERVDEF, sy-vline,
  WA_RNWCH_PI_INQ_MULT_O-COVINT_DRUGS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RNWCH_PI_INQ_MULT_O 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_RNWCH_PI_INQ_MULT_O 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_RNWCH_PI_INQ_MULT_O INTO WA_RNWCH_PI_INQ_MULT_O.


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

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

*Conversion exit ALPHA, internal->external for field PATNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNWCH_PI_INQ_MULT_O-PATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNWCH_PI_INQ_MULT_O-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_RNWCH_PI_INQ_MULT_O_STR, 
INQUIRY_ID TYPE STRING,
FALNR TYPE STRING,
LFDNR TYPE STRING,
QUERY_DATE TYPE STRING,
CARDNR TYPE STRING,
BEGDT TYPE STRING,
ENDDT TYPE STRING,
COV_BEGDT TYPE STRING,
COV_ENDDT TYPE STRING,
SERVDEF TYPE STRING,
COVINT_DRUGS TYPE STRING,
COVINT_HOSP TYPE STRING,
RETURN_CODE TYPE STRING,
RETURN_MESSAGE TYPE STRING,
NEGK_DATA TYPE STRING,
VNEHC TYPE STRING,
MANDT TYPE STRING,
LNCRD TYPE STRING,
CRDTYPE TYPE STRING,
EXT_KEY1 TYPE STRING,
EXT_KEY2 TYPE STRING,
PATNR TYPE STRING,
ERUSR TYPE STRING,
ERDAT TYPE STRING,
ERTIM TYPE STRING,
UPUSR TYPE STRING,
UPDAT TYPE STRING,
UPTIM TYPE STRING,
STORN TYPE STRING,
DOCTYPE TYPE STRING,
MANUAL TYPE STRING,
READ_DATE TYPE STRING,
ONLINQOK TYPE STRING,
BEGDT TYPE STRING,
ENDDT TYPE STRING,
CARDVALID TYPE STRING,
CVUSR TYPE STRING,
CVDAT TYPE STRING,
CVTIM TYPE STRING,
EF_VERSION TYPE STRING,
CDATA TYPE STRING,
KZ TYPE STRING,
VNEHC_PAT_T TYPE STRING,
VNEHC_INS_T TYPE STRING,
VNEHC_ITX_T TYPE STRING,
VNEHC_REP_T TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RNWCH_PI_INQ_MULT_O_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_RNWCH_PI_INQ_MULT_O_STR-INQUIRY_ID sy-vline 
WA_RNWCH_PI_INQ_MULT_O_STR-FALNR sy-vline 
WA_RNWCH_PI_INQ_MULT_O_STR-LFDNR sy-vline 
WA_RNWCH_PI_INQ_MULT_O_STR-QUERY_DATE sy-vline 
WA_RNWCH_PI_INQ_MULT_O_STR-CARDNR sy-vline 
WA_RNWCH_PI_INQ_MULT_O_STR-BEGDT sy-vline 
WA_RNWCH_PI_INQ_MULT_O_STR-ENDDT sy-vline 
WA_RNWCH_PI_INQ_MULT_O_STR-COV_BEGDT sy-vline 
WA_RNWCH_PI_INQ_MULT_O_STR-COV_ENDDT sy-vline 
WA_RNWCH_PI_INQ_MULT_O_STR-SERVDEF sy-vline 
WA_RNWCH_PI_INQ_MULT_O_STR-COVINT_DRUGS sy-vline 
WA_RNWCH_PI_INQ_MULT_O_STR-COVINT_HOSP sy-vline 
WA_RNWCH_PI_INQ_MULT_O_STR-RETURN_CODE sy-vline 
WA_RNWCH_PI_INQ_MULT_O_STR-RETURN_MESSAGE sy-vline 
WA_RNWCH_PI_INQ_MULT_O_STR-NEGK_DATA sy-vline 
WA_RNWCH_PI_INQ_MULT_O_STR-VNEHC sy-vline 
WA_RNWCH_PI_INQ_MULT_O_STR-MANDT sy-vline 
WA_RNWCH_PI_INQ_MULT_O_STR-LNCRD sy-vline 
WA_RNWCH_PI_INQ_MULT_O_STR-CRDTYPE sy-vline 
WA_RNWCH_PI_INQ_MULT_O_STR-EXT_KEY1 sy-vline 
WA_RNWCH_PI_INQ_MULT_O_STR-EXT_KEY2 sy-vline 
WA_RNWCH_PI_INQ_MULT_O_STR-PATNR sy-vline 
WA_RNWCH_PI_INQ_MULT_O_STR-ERUSR sy-vline 
WA_RNWCH_PI_INQ_MULT_O_STR-ERDAT sy-vline 
WA_RNWCH_PI_INQ_MULT_O_STR-ERTIM sy-vline 
WA_RNWCH_PI_INQ_MULT_O_STR-UPUSR sy-vline 
WA_RNWCH_PI_INQ_MULT_O_STR-UPDAT sy-vline 
WA_RNWCH_PI_INQ_MULT_O_STR-UPTIM sy-vline 
WA_RNWCH_PI_INQ_MULT_O_STR-STORN sy-vline 
WA_RNWCH_PI_INQ_MULT_O_STR-DOCTYPE sy-vline 
WA_RNWCH_PI_INQ_MULT_O_STR-MANUAL sy-vline 
WA_RNWCH_PI_INQ_MULT_O_STR-READ_DATE sy-vline 
WA_RNWCH_PI_INQ_MULT_O_STR-ONLINQOK sy-vline 
WA_RNWCH_PI_INQ_MULT_O_STR-BEGDT sy-vline 
WA_RNWCH_PI_INQ_MULT_O_STR-ENDDT sy-vline 
WA_RNWCH_PI_INQ_MULT_O_STR-CARDVALID sy-vline 
WA_RNWCH_PI_INQ_MULT_O_STR-CVUSR sy-vline 
WA_RNWCH_PI_INQ_MULT_O_STR-CVDAT sy-vline 
WA_RNWCH_PI_INQ_MULT_O_STR-CVTIM sy-vline 
WA_RNWCH_PI_INQ_MULT_O_STR-EF_VERSION sy-vline 
WA_RNWCH_PI_INQ_MULT_O_STR-CDATA sy-vline 
WA_RNWCH_PI_INQ_MULT_O_STR-KZ sy-vline 
WA_RNWCH_PI_INQ_MULT_O_STR-VNEHC_PAT_T sy-vline 
WA_RNWCH_PI_INQ_MULT_O_STR-VNEHC_INS_T sy-vline 
WA_RNWCH_PI_INQ_MULT_O_STR-VNEHC_ITX_T sy-vline 
WA_RNWCH_PI_INQ_MULT_O_STR-VNEHC_REP_T sy-vline      INTO ld_text SEPARATED BY SPACE.

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