ABAP Select data from SAP table V_ML4H_WIPRED into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP V_ML4H_WIPRED 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_ML4H_WIPRED. 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_ML4H_WIPRED 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_ML4H_WIPRED TYPE STANDARD TABLE OF V_ML4H_WIPRED,
      WA_V_ML4H_WIPRED TYPE V_ML4H_WIPRED,
      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_ML4H_WIPRED> TYPE V_ML4H_WIPRED.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_V_ML4H_WIPRED.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM V_ML4H_WIPRED
  INTO TABLE IT_V_ML4H_WIPRED.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM V_ML4H_WIPRED
*  INTO TABLE @DATA(IT_V_ML4H_WIPRED2).
*--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_ML4H_WIPRED INDEX 1 INTO DATA(WA_V_ML4H_WIPRED2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_V_ML4H_WIPRED ASSIGNING <V_ML4H_WIPRED>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<V_ML4H_WIPRED>-MANDT = 1.
<V_ML4H_WIPRED>-KALNR_PRZ = 1.
<V_ML4H_WIPRED>-KALNR_MAT = 1.
<V_ML4H_WIPRED>-RLDNR = 1.
<V_ML4H_WIPRED>-OBTYP = 1.

ENDLOOP.

LOOP AT IT_V_ML4H_WIPRED INTO WA_V_ML4H_WIPRED.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_V_ML4H_WIPRED-WERKS, sy-vline,
  WA_V_ML4H_WIPRED-BWKEY, sy-vline,
  WA_V_ML4H_WIPRED-MATNR, sy-vline,
  WA_V_ML4H_WIPRED-BWTAR, sy-vline,
  WA_V_ML4H_WIPRED-SOBKZ, sy-vline,
  WA_V_ML4H_WIPRED-VBELN, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_V_ML4H_WIPRED 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_ML4H_WIPRED 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_ML4H_WIPRED INTO WA_V_ML4H_WIPRED.


*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 RLDNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_V_ML4H_WIPRED-RLDNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_V_ML4H_WIPRED-RLDNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_V_ML4H_WIPRED-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_V_ML4H_WIPRED-MATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field VBELN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_V_ML4H_WIPRED-VBELN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_V_ML4H_WIPRED-VBELN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ABPSP, internal->external for field PSPNR
CALL FUNCTION 'CONVERSION_EXIT_ABPSP_OUTPUT'
  EXPORTING
    input =                      WA_V_ML4H_WIPRED-PSPNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_V_ML4H_WIPRED-PSPNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field LIFNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_V_ML4H_WIPRED-LIFNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_V_ML4H_WIPRED-LIFNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MEINH
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_V_ML4H_WIPRED-MEINH
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_V_ML4H_WIPRED-MEINH.
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_ML4H_WIPRED_STR, 
MANDT TYPE STRING,
KALNR_PRZ TYPE STRING,
KALNR_MAT TYPE STRING,
RLDNR TYPE STRING,
OBTYP TYPE STRING,
WERKS TYPE STRING,
BWKEY TYPE STRING,
MATNR TYPE STRING,
BWTAR TYPE STRING,
SOBKZ TYPE STRING,
VBELN TYPE STRING,
POSNR TYPE STRING,
PSPNR TYPE STRING,
LIFNR TYPE STRING,
GJAHR TYPE STRING,
PERIO TYPE STRING,
WJAHR TYPE STRING,
WPERI TYPE STRING,
MEINH TYPE STRING,
MENGE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_V_ML4H_WIPRED_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_ML4H_WIPRED_STR-MANDT sy-vline 
WA_V_ML4H_WIPRED_STR-KALNR_PRZ sy-vline 
WA_V_ML4H_WIPRED_STR-KALNR_MAT sy-vline 
WA_V_ML4H_WIPRED_STR-RLDNR sy-vline 
WA_V_ML4H_WIPRED_STR-OBTYP sy-vline 
WA_V_ML4H_WIPRED_STR-WERKS sy-vline 
WA_V_ML4H_WIPRED_STR-BWKEY sy-vline 
WA_V_ML4H_WIPRED_STR-MATNR sy-vline 
WA_V_ML4H_WIPRED_STR-BWTAR sy-vline 
WA_V_ML4H_WIPRED_STR-SOBKZ sy-vline 
WA_V_ML4H_WIPRED_STR-VBELN sy-vline 
WA_V_ML4H_WIPRED_STR-POSNR sy-vline 
WA_V_ML4H_WIPRED_STR-PSPNR sy-vline 
WA_V_ML4H_WIPRED_STR-LIFNR sy-vline 
WA_V_ML4H_WIPRED_STR-GJAHR sy-vline 
WA_V_ML4H_WIPRED_STR-PERIO sy-vline 
WA_V_ML4H_WIPRED_STR-WJAHR sy-vline 
WA_V_ML4H_WIPRED_STR-WPERI sy-vline 
WA_V_ML4H_WIPRED_STR-MEINH sy-vline 
WA_V_ML4H_WIPRED_STR-MENGE sy-vline      INTO ld_text SEPARATED BY SPACE.

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