ABAP Select data from SAP table RLMON into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RLMON
*  INTO TABLE @DATA(IT_RLMON2).
*--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_RLMON INDEX 1 INTO DATA(WA_RLMON2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RLMON>-MAXOB = 1.
<RLMON>-WLEFT = 1.
<RLMON>-BTREE = 1.
<RLMON>-BSIZE = 1.
<RLMON>-INTRV = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RLMON-CLOCK, sy-vline,
  WA_RLMON-MSGT1, sy-vline,
  WA_RLMON-MSGT2, sy-vline,
  WA_RLMON-MSGT3, sy-vline,
  WA_RLMON-MSGT4, sy-vline,
  WA_RLMON-MSGIC, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RLMON 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_RLMON 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_RLMON INTO WA_RLMON.


*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_RLMON_STR, 
MAXOB TYPE STRING,
WLEFT TYPE STRING,
BTREE TYPE STRING,
BSIZE TYPE STRING,
INTRV TYPE STRING,
CLOCK TYPE STRING,
MSGT1 TYPE STRING,
MSGT2 TYPE STRING,
MSGT3 TYPE STRING,
MSGT4 TYPE STRING,
MSGIC TYPE STRING,
COTRE TYPE STRING,
STATV TYPE STRING,
VIAZN TYPE STRING,
ZONESRC TYPE STRING,
ZONEDST TYPE STRING,
NODESRC TYPE STRING,
NODEDST TYPE STRING,
ICON_ATTR TYPE STRING,
TL_LPDVC TYPE STRING,
TL_STPRI TYPE STRING,
TL_MNVAR TYPE STRING,
TL_MROUT TYPE STRING,
ZONE_FNCTN_TXT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RLMON_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_RLMON_STR-MAXOB sy-vline 
WA_RLMON_STR-WLEFT sy-vline 
WA_RLMON_STR-BTREE sy-vline 
WA_RLMON_STR-BSIZE sy-vline 
WA_RLMON_STR-INTRV sy-vline 
WA_RLMON_STR-CLOCK sy-vline 
WA_RLMON_STR-MSGT1 sy-vline 
WA_RLMON_STR-MSGT2 sy-vline 
WA_RLMON_STR-MSGT3 sy-vline 
WA_RLMON_STR-MSGT4 sy-vline 
WA_RLMON_STR-MSGIC sy-vline 
WA_RLMON_STR-COTRE sy-vline 
WA_RLMON_STR-STATV sy-vline 
WA_RLMON_STR-VIAZN sy-vline 
WA_RLMON_STR-ZONESRC sy-vline 
WA_RLMON_STR-ZONEDST sy-vline 
WA_RLMON_STR-NODESRC sy-vline 
WA_RLMON_STR-NODEDST sy-vline 
WA_RLMON_STR-ICON_ATTR sy-vline 
WA_RLMON_STR-TL_LPDVC sy-vline 
WA_RLMON_STR-TL_STPRI sy-vline 
WA_RLMON_STR-TL_MNVAR sy-vline 
WA_RLMON_STR-TL_MROUT sy-vline 
WA_RLMON_STR-ZONE_FNCTN_TXT sy-vline      INTO ld_text SEPARATED BY SPACE.

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