ABAP Select data from SAP table RN1ME_PREPDOC_ALV into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RN1ME_PREPDOC_ALV 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 RN1ME_PREPDOC_ALV. 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 RN1ME_PREPDOC_ALV 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_RN1ME_PREPDOC_ALV TYPE STANDARD TABLE OF RN1ME_PREPDOC_ALV,
      WA_RN1ME_PREPDOC_ALV TYPE RN1ME_PREPDOC_ALV,
      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: <RN1ME_PREPDOC_ALV> TYPE RN1ME_PREPDOC_ALV.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RN1ME_PREPDOC_ALV.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RN1ME_PREPDOC_ALV
  INTO TABLE IT_RN1ME_PREPDOC_ALV.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RN1ME_PREPDOC_ALV
*  INTO TABLE @DATA(IT_RN1ME_PREPDOC_ALV2).
*--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_RN1ME_PREPDOC_ALV INDEX 1 INTO DATA(WA_RN1ME_PREPDOC_ALV2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RN1ME_PREPDOC_ALV ASSIGNING <RN1ME_PREPDOC_ALV>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RN1ME_PREPDOC_ALV>-MANDT = 1.
<RN1ME_PREPDOC_ALV>-EPREPID = 1.
<RN1ME_PREPDOC_ALV>-MEORDID = 1.
<RN1ME_PREPDOC_ALV>-MEEVTID = 1.
<RN1ME_PREPDOC_ALV>-EXTPREPID = 1.

ENDLOOP.

LOOP AT IT_RN1ME_PREPDOC_ALV INTO WA_RN1ME_PREPDOC_ALV.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RN1ME_PREPDOC_ALV-POPAT, sy-vline,
  WA_RN1ME_PREPDOC_ALV-EMPRESP, sy-vline,
  WA_RN1ME_PREPDOC_ALV-STORN, sy-vline,
  WA_RN1ME_PREPDOC_ALV-STUSR, sy-vline,
  WA_RN1ME_PREPDOC_ALV-STDAT, sy-vline,
  WA_RN1ME_PREPDOC_ALV-ERDAT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RN1ME_PREPDOC_ALV 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_RN1ME_PREPDOC_ALV 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_RN1ME_PREPDOC_ALV INTO WA_RN1ME_PREPDOC_ALV.


*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 EMPRESP
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RN1ME_PREPDOC_ALV-EMPRESP
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RN1ME_PREPDOC_ALV-EMPRESP.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ME12D, internal->external for field QUANTM
CALL FUNCTION 'CONVERSION_EXIT_ME12D_OUTPUT'
  EXPORTING
    input =                      WA_RN1ME_PREPDOC_ALV-QUANTM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RN1ME_PREPDOC_ALV-QUANTM.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field QUANTU
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_RN1ME_PREPDOC_ALV-QUANTU
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RN1ME_PREPDOC_ALV-QUANTU.
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_RN1ME_PREPDOC_ALV_STR, 
MANDT TYPE STRING,
EPREPID TYPE STRING,
MEORDID TYPE STRING,
MEEVTID TYPE STRING,
EXTPREPID TYPE STRING,
POPAT TYPE STRING,
EMPRESP TYPE STRING,
STORN TYPE STRING,
STUSR TYPE STRING,
STDAT TYPE STRING,
ERDAT TYPE STRING,
ERTIM TYPE STRING,
ERUSR TYPE STRING,
UPDAT TYPE STRING,
UPTIM TYPE STRING,
UPUSR TYPE STRING,
EXPAND TYPE STRING,
INFO TYPE STRING,
VMANAME TYPE STRING,
QUANTM TYPE STRING,
QUANTU TYPE STRING,
ALV_STYLE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RN1ME_PREPDOC_ALV_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_RN1ME_PREPDOC_ALV_STR-MANDT sy-vline 
WA_RN1ME_PREPDOC_ALV_STR-EPREPID sy-vline 
WA_RN1ME_PREPDOC_ALV_STR-MEORDID sy-vline 
WA_RN1ME_PREPDOC_ALV_STR-MEEVTID sy-vline 
WA_RN1ME_PREPDOC_ALV_STR-EXTPREPID sy-vline 
WA_RN1ME_PREPDOC_ALV_STR-POPAT sy-vline 
WA_RN1ME_PREPDOC_ALV_STR-EMPRESP sy-vline 
WA_RN1ME_PREPDOC_ALV_STR-STORN sy-vline 
WA_RN1ME_PREPDOC_ALV_STR-STUSR sy-vline 
WA_RN1ME_PREPDOC_ALV_STR-STDAT sy-vline 
WA_RN1ME_PREPDOC_ALV_STR-ERDAT sy-vline 
WA_RN1ME_PREPDOC_ALV_STR-ERTIM sy-vline 
WA_RN1ME_PREPDOC_ALV_STR-ERUSR sy-vline 
WA_RN1ME_PREPDOC_ALV_STR-UPDAT sy-vline 
WA_RN1ME_PREPDOC_ALV_STR-UPTIM sy-vline 
WA_RN1ME_PREPDOC_ALV_STR-UPUSR sy-vline 
WA_RN1ME_PREPDOC_ALV_STR-EXPAND sy-vline 
WA_RN1ME_PREPDOC_ALV_STR-INFO sy-vline 
WA_RN1ME_PREPDOC_ALV_STR-VMANAME sy-vline 
WA_RN1ME_PREPDOC_ALV_STR-QUANTM sy-vline 
WA_RN1ME_PREPDOC_ALV_STR-QUANTU sy-vline 
WA_RN1ME_PREPDOC_ALV_STR-ALV_STYLE sy-vline      INTO ld_text SEPARATED BY SPACE.

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