ABAP Select data from SAP table MLAVRSCALE into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MLAVRSCALE
*  INTO TABLE @DATA(IT_MLAVRSCALE2).
*--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_MLAVRSCALE INDEX 1 INTO DATA(WA_MLAVRSCALE2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MLAVRSCALE>-MANDT = 1.
<MLAVRSCALE>-RUN_ID = 1.
<MLAVRSCALE>-KALNR_OUT = 1.
<MLAVRSCALE>-KALNR_IN = 1.
<MLAVRSCALE>-KALNR_BA = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MLAVRSCALE-KALNR_VA, sy-vline,
  WA_MLAVRSCALE-CURTP_OUT, sy-vline,
  WA_MLAVRSCALE-CURTP_IN, sy-vline,
  WA_MLAVRSCALE-GJAHR_OUT, sy-vline,
  WA_MLAVRSCALE-POPER_OUT, sy-vline,
  WA_MLAVRSCALE-CATEG, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MLAVRSCALE 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_MLAVRSCALE 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_MLAVRSCALE INTO WA_MLAVRSCALE.


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

*Conversion exit GJAHR, internal->external for field GJAHR_IN
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_MLAVRSCALE-GJAHR_IN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MLAVRSCALE-GJAHR_IN.
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_MLAVRSCALE_STR, 
MANDT TYPE STRING,
RUN_ID TYPE STRING,
KALNR_OUT TYPE STRING,
KALNR_IN TYPE STRING,
KALNR_BA TYPE STRING,
KALNR_VA TYPE STRING,
CURTP_OUT TYPE STRING,
CURTP_IN TYPE STRING,
GJAHR_OUT TYPE STRING,
POPER_OUT TYPE STRING,
CATEG TYPE STRING,
PTYP TYPE STRING,
XCUMREC TYPE STRING,
BTYP_OUT TYPE STRING,
GJAHR_IN TYPE STRING,
POPER_IN TYPE STRING,
DIFF_OUT TYPE STRING,
WAERS_OUT TYPE STRING,
DIFF_IN TYPE STRING,
WAERS_IN TYPE STRING,
RATIO TYPE STRING,
SCALETYP TYPE STRING,
OTYP_IN TYPE STRING,
XCUM TYPE STRING,
XCLS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MLAVRSCALE_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_MLAVRSCALE_STR-MANDT sy-vline 
WA_MLAVRSCALE_STR-RUN_ID sy-vline 
WA_MLAVRSCALE_STR-KALNR_OUT sy-vline 
WA_MLAVRSCALE_STR-KALNR_IN sy-vline 
WA_MLAVRSCALE_STR-KALNR_BA sy-vline 
WA_MLAVRSCALE_STR-KALNR_VA sy-vline 
WA_MLAVRSCALE_STR-CURTP_OUT sy-vline 
WA_MLAVRSCALE_STR-CURTP_IN sy-vline 
WA_MLAVRSCALE_STR-GJAHR_OUT sy-vline 
WA_MLAVRSCALE_STR-POPER_OUT sy-vline 
WA_MLAVRSCALE_STR-CATEG sy-vline 
WA_MLAVRSCALE_STR-PTYP sy-vline 
WA_MLAVRSCALE_STR-XCUMREC sy-vline 
WA_MLAVRSCALE_STR-BTYP_OUT sy-vline 
WA_MLAVRSCALE_STR-GJAHR_IN sy-vline 
WA_MLAVRSCALE_STR-POPER_IN sy-vline 
WA_MLAVRSCALE_STR-DIFF_OUT sy-vline 
WA_MLAVRSCALE_STR-WAERS_OUT sy-vline 
WA_MLAVRSCALE_STR-DIFF_IN sy-vline 
WA_MLAVRSCALE_STR-WAERS_IN sy-vline 
WA_MLAVRSCALE_STR-RATIO sy-vline 
WA_MLAVRSCALE_STR-SCALETYP sy-vline 
WA_MLAVRSCALE_STR-OTYP_IN sy-vline 
WA_MLAVRSCALE_STR-XCUM sy-vline 
WA_MLAVRSCALE_STR-XCLS sy-vline      INTO ld_text SEPARATED BY SPACE.

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