ABAP Select data from SAP table UPOS_MEDOC_ITUOM into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM UPOS_MEDOC_ITUOM
*  INTO TABLE @DATA(IT_UPOS_MEDOC_ITUOM2).
*--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_UPOS_MEDOC_ITUOM INDEX 1 INTO DATA(WA_UPOS_MEDOC_ITUOM2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<UPOS_MEDOC_ITUOM>-MANDT = 1.
<UPOS_MEDOC_ITUOM>-DOCNR = 1.
<UPOS_MEDOC_ITUOM>-DOCYR = 1.
<UPOS_MEDOC_ITUOM>-RDGID = 1.
<UPOS_MEDOC_ITUOM>-RETYP = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_UPOS_MEDOC_ITUOM-REFMT, sy-vline,
  WA_UPOS_MEDOC_ITUOM-MERDG, sy-vline,
  WA_UPOS_MEDOC_ITUOM-RUNIT, sy-vline,
  WA_UPOS_MEDOC_ITUOM-XVOBS, sy-vline,
  WA_UPOS_MEDOC_ITUOM-XNVAL, sy-vline,
  WA_UPOS_MEDOC_ITUOM-XHIDE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_UPOS_MEDOC_ITUOM 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_UPOS_MEDOC_ITUOM 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_UPOS_MEDOC_ITUOM INTO WA_UPOS_MEDOC_ITUOM.


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

*Conversion exit GJAHR, internal->external for field DOCYR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_UPOS_MEDOC_ITUOM-DOCYR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_UPOS_MEDOC_ITUOM-DOCYR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field RUNIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_UPOS_MEDOC_ITUOM-RUNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_UPOS_MEDOC_ITUOM-RUNIT.
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_UPOS_MEDOC_ITUOM_STR, 
MANDT TYPE STRING,
DOCNR TYPE STRING,
DOCYR TYPE STRING,
RDGID TYPE STRING,
RETYP TYPE STRING,
REFMT TYPE STRING,
MERDG TYPE STRING,
RUNIT TYPE STRING,
XVOBS TYPE STRING,
XNVAL TYPE STRING,
XHIDE TYPE STRING,
RDFMT TYPE STRING,
RDLEN TYPE STRING,
RDDEC TYPE STRING,END OF T_EKKO_STR.
DATA: WA_UPOS_MEDOC_ITUOM_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_UPOS_MEDOC_ITUOM_STR-MANDT sy-vline 
WA_UPOS_MEDOC_ITUOM_STR-DOCNR sy-vline 
WA_UPOS_MEDOC_ITUOM_STR-DOCYR sy-vline 
WA_UPOS_MEDOC_ITUOM_STR-RDGID sy-vline 
WA_UPOS_MEDOC_ITUOM_STR-RETYP sy-vline 
WA_UPOS_MEDOC_ITUOM_STR-REFMT sy-vline 
WA_UPOS_MEDOC_ITUOM_STR-MERDG sy-vline 
WA_UPOS_MEDOC_ITUOM_STR-RUNIT sy-vline 
WA_UPOS_MEDOC_ITUOM_STR-XVOBS sy-vline 
WA_UPOS_MEDOC_ITUOM_STR-XNVAL sy-vline 
WA_UPOS_MEDOC_ITUOM_STR-XHIDE sy-vline 
WA_UPOS_MEDOC_ITUOM_STR-RDFMT sy-vline 
WA_UPOS_MEDOC_ITUOM_STR-RDLEN sy-vline 
WA_UPOS_MEDOC_ITUOM_STR-RDDEC sy-vline      INTO ld_text SEPARATED BY SPACE.

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