ABAP Select data from SAP table V_OIUOW_LGFLD_AT into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM V_OIUOW_LGFLD_AT
*  INTO TABLE @DATA(IT_V_OIUOW_LGFLD_AT2).
*--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_V_OIUOW_LGFLD_AT INDEX 1 INTO DATA(WA_V_OIUOW_LGFLD_AT2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<V_OIUOW_LGFLD_AT>-MANDT = 1.
<V_OIUOW_LGFLD_AT>-FLD_CD = 1.
<V_OIUOW_LGFLD_AT>-FLD_FRMT = 1.
<V_OIUOW_LGFLD_AT>-FLD_DIMID = 1.
<V_OIUOW_LGFLD_AT>-FLD_MEAS_U = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_V_OIUOW_LGFLD_AT-FLD_XUOMC, sy-vline,
  WA_V_OIUOW_LGFLD_AT-FLD_XUOMR, sy-vline,
  WA_V_OIUOW_LGFLD_AT-FLD_XNEGA, sy-vline,
  WA_V_OIUOW_LGFLD_AT-FLD_RFRMT, sy-vline,
  WA_V_OIUOW_LGFLD_AT-FLD_FDLEN, sy-vline,
  WA_V_OIUOW_LGFLD_AT-FLD_RDDEC, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_V_OIUOW_LGFLD_AT 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_V_OIUOW_LGFLD_AT 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_V_OIUOW_LGFLD_AT INTO WA_V_OIUOW_LGFLD_AT.


*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 CUNIT, internal->external for field FLD_MEAS_U
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_V_OIUOW_LGFLD_AT-FLD_MEAS_U
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_V_OIUOW_LGFLD_AT-FLD_MEAS_U.
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_V_OIUOW_LGFLD_AT_STR, 
MANDT TYPE STRING,
FLD_CD TYPE STRING,
FLD_FRMT TYPE STRING,
FLD_DIMID TYPE STRING,
FLD_MEAS_U TYPE STRING,
FLD_XUOMC TYPE STRING,
FLD_XUOMR TYPE STRING,
FLD_XNEGA TYPE STRING,
FLD_RFRMT TYPE STRING,
FLD_FDLEN TYPE STRING,
FLD_RDDEC TYPE STRING,
FLD_XRNDG TYPE STRING,
RFACT TYPE STRING,
FLD_XVDEF TYPE STRING,
FLD_VLDEF_P TYPE STRING,
FLD_VLDEF_C TYPE STRING,
FLD_VLDEF_D TYPE STRING,
FLD_VLDEF_T TYPE STRING,
FLD_XWARN TYPE STRING,
FLD_VLMIN_W TYPE STRING,
FLD_VLMAX_W TYPE STRING,
FLD_XERROR TYPE STRING,
FLD_VLMIN_E TYPE STRING,
FLD_VLMAX_E TYPE STRING,
TABNAME TYPE STRING,
FIELDNAME TYPE STRING,
DOM_REF TYPE STRING,
SHLPNAME TYPE STRING,
SHLPFIELD TYPE STRING,END OF T_EKKO_STR.
DATA: WA_V_OIUOW_LGFLD_AT_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_V_OIUOW_LGFLD_AT_STR-MANDT sy-vline 
WA_V_OIUOW_LGFLD_AT_STR-FLD_CD sy-vline 
WA_V_OIUOW_LGFLD_AT_STR-FLD_FRMT sy-vline 
WA_V_OIUOW_LGFLD_AT_STR-FLD_DIMID sy-vline 
WA_V_OIUOW_LGFLD_AT_STR-FLD_MEAS_U sy-vline 
WA_V_OIUOW_LGFLD_AT_STR-FLD_XUOMC sy-vline 
WA_V_OIUOW_LGFLD_AT_STR-FLD_XUOMR sy-vline 
WA_V_OIUOW_LGFLD_AT_STR-FLD_XNEGA sy-vline 
WA_V_OIUOW_LGFLD_AT_STR-FLD_RFRMT sy-vline 
WA_V_OIUOW_LGFLD_AT_STR-FLD_FDLEN sy-vline 
WA_V_OIUOW_LGFLD_AT_STR-FLD_RDDEC sy-vline 
WA_V_OIUOW_LGFLD_AT_STR-FLD_XRNDG sy-vline 
WA_V_OIUOW_LGFLD_AT_STR-RFACT sy-vline 
WA_V_OIUOW_LGFLD_AT_STR-FLD_XVDEF sy-vline 
WA_V_OIUOW_LGFLD_AT_STR-FLD_VLDEF_P sy-vline 
WA_V_OIUOW_LGFLD_AT_STR-FLD_VLDEF_C sy-vline 
WA_V_OIUOW_LGFLD_AT_STR-FLD_VLDEF_D sy-vline 
WA_V_OIUOW_LGFLD_AT_STR-FLD_VLDEF_T sy-vline 
WA_V_OIUOW_LGFLD_AT_STR-FLD_XWARN sy-vline 
WA_V_OIUOW_LGFLD_AT_STR-FLD_VLMIN_W sy-vline 
WA_V_OIUOW_LGFLD_AT_STR-FLD_VLMAX_W sy-vline 
WA_V_OIUOW_LGFLD_AT_STR-FLD_XERROR sy-vline 
WA_V_OIUOW_LGFLD_AT_STR-FLD_VLMIN_E sy-vline 
WA_V_OIUOW_LGFLD_AT_STR-FLD_VLMAX_E sy-vline 
WA_V_OIUOW_LGFLD_AT_STR-TABNAME sy-vline 
WA_V_OIUOW_LGFLD_AT_STR-FIELDNAME sy-vline 
WA_V_OIUOW_LGFLD_AT_STR-DOM_REF sy-vline 
WA_V_OIUOW_LGFLD_AT_STR-SHLPNAME sy-vline 
WA_V_OIUOW_LGFLD_AT_STR-SHLPFIELD sy-vline      INTO ld_text SEPARATED BY SPACE.

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