ABAP Select data from SAP table LVC_MALLOC into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM LVC_MALLOC
*  INTO TABLE @DATA(IT_LVC_MALLOC2).
*--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_LVC_MALLOC INDEX 1 INTO DATA(WA_LVC_MALLOC2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<LVC_MALLOC>-METHODE = 1.
<LVC_MALLOC>-CALL_CNT = 1.
<LVC_MALLOC>-OMSCASIZE = 1.
<LVC_MALLOC>-MALLOCCNT = 1.
<LVC_MALLOC>-MALLOCMIN = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_LVC_MALLOC-MALLOCMAX, sy-vline,
  WA_LVC_MALLOC-MALLOCAVG, sy-vline,
  WA_LVC_MALLOC-FREECNT, sy-vline,
  WA_LVC_MALLOC-FREEMIN, sy-vline,
  WA_LVC_MALLOC-FREEMAX, sy-vline,
  WA_LVC_MALLOC-FREEAVG, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_LVC_MALLOC 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_LVC_MALLOC 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_LVC_MALLOC INTO WA_LVC_MALLOC.


*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.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_LVC_MALLOC_STR, 
METHODE TYPE STRING,
CALL_CNT TYPE STRING,
OMSCASIZE TYPE STRING,
MALLOCCNT TYPE STRING,
MALLOCMIN TYPE STRING,
MALLOCMAX TYPE STRING,
MALLOCAVG TYPE STRING,
FREECNT TYPE STRING,
FREEMIN TYPE STRING,
FREEMAX TYPE STRING,
FREEAVG TYPE STRING,
DALLOCMIN TYPE STRING,
DALLOCMAX TYPE STRING,
DALLOCAVG TYPE STRING,
TENANT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_LVC_MALLOC_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_LVC_MALLOC_STR-METHODE sy-vline 
WA_LVC_MALLOC_STR-CALL_CNT sy-vline 
WA_LVC_MALLOC_STR-OMSCASIZE sy-vline 
WA_LVC_MALLOC_STR-MALLOCCNT sy-vline 
WA_LVC_MALLOC_STR-MALLOCMIN sy-vline 
WA_LVC_MALLOC_STR-MALLOCMAX sy-vline 
WA_LVC_MALLOC_STR-MALLOCAVG sy-vline 
WA_LVC_MALLOC_STR-FREECNT sy-vline 
WA_LVC_MALLOC_STR-FREEMIN sy-vline 
WA_LVC_MALLOC_STR-FREEMAX sy-vline 
WA_LVC_MALLOC_STR-FREEAVG sy-vline 
WA_LVC_MALLOC_STR-DALLOCMIN sy-vline 
WA_LVC_MALLOC_STR-DALLOCMAX sy-vline 
WA_LVC_MALLOC_STR-DALLOCAVG sy-vline 
WA_LVC_MALLOC_STR-TENANT sy-vline      INTO ld_text SEPARATED BY SPACE.

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