ABAP Select data from SAP table CST_RSMONMS3_ALV into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP CST_RSMONMS3_ALV 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 CST_RSMONMS3_ALV. 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 CST_RSMONMS3_ALV 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_CST_RSMONMS3_ALV TYPE STANDARD TABLE OF CST_RSMONMS3_ALV,
      WA_CST_RSMONMS3_ALV TYPE CST_RSMONMS3_ALV,
      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: <CST_RSMONMS3_ALV> TYPE CST_RSMONMS3_ALV.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_CST_RSMONMS3_ALV.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM CST_RSMONMS3_ALV
  INTO TABLE IT_CST_RSMONMS3_ALV.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CST_RSMONMS3_ALV
*  INTO TABLE @DATA(IT_CST_RSMONMS3_ALV2).
*--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_CST_RSMONMS3_ALV INDEX 1 INTO DATA(WA_CST_RSMONMS3_ALV2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_CST_RSMONMS3_ALV ASSIGNING <CST_RSMONMS3_ALV>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CST_RSMONMS3_ALV>-INDEX1 = 1.
<CST_RSMONMS3_ALV>-SELECTED = 1.
<CST_RSMONMS3_ALV>-PROT = 1.
<CST_RSMONMS3_ALV>-BHOST = 1.
<CST_RSMONMS3_ALV>-ADDR = 1.

ENDLOOP.

LOOP AT IT_CST_RSMONMS3_ALV INTO WA_CST_RSMONMS3_ALV.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CST_RSMONMS3_ALV-PORT, sy-vline,
  WA_CST_RSMONMS3_ALV-EXTBIND, sy-vline,
  WA_CST_RSMONMS3_ALV-EXTBIND_ICON, sy-vline,
  WA_CST_RSMONMS3_ALV-VHOSTIDX, sy-vline,
  WA_CST_RSMONMS3_ALV-CHANGEABLE, sy-vline,
  WA_CST_RSMONMS3_ALV-PARAM, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CST_RSMONMS3_ALV 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_CST_RSMONMS3_ALV 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_CST_RSMONMS3_ALV INTO WA_CST_RSMONMS3_ALV.


*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_CST_RSMONMS3_ALV_STR, 
INDEX1 TYPE STRING,
SELECTED TYPE STRING,
PROT TYPE STRING,
BHOST TYPE STRING,
ADDR TYPE STRING,
PORT TYPE STRING,
EXTBIND TYPE STRING,
EXTBIND_ICON TYPE STRING,
VHOSTIDX TYPE STRING,
CHANGEABLE TYPE STRING,
PARAM TYPE STRING,
RIHOST TYPE STRING,
RISERV TYPE STRING,
STATESTR TYPE STRING,
STATE TYPE STRING,
TIMEOUT TYPE STRING,
PROCTIME TYPE STRING,
ACLFILE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CST_RSMONMS3_ALV_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_CST_RSMONMS3_ALV_STR-INDEX1 sy-vline 
WA_CST_RSMONMS3_ALV_STR-SELECTED sy-vline 
WA_CST_RSMONMS3_ALV_STR-PROT sy-vline 
WA_CST_RSMONMS3_ALV_STR-BHOST sy-vline 
WA_CST_RSMONMS3_ALV_STR-ADDR sy-vline 
WA_CST_RSMONMS3_ALV_STR-PORT sy-vline 
WA_CST_RSMONMS3_ALV_STR-EXTBIND sy-vline 
WA_CST_RSMONMS3_ALV_STR-EXTBIND_ICON sy-vline 
WA_CST_RSMONMS3_ALV_STR-VHOSTIDX sy-vline 
WA_CST_RSMONMS3_ALV_STR-CHANGEABLE sy-vline 
WA_CST_RSMONMS3_ALV_STR-PARAM sy-vline 
WA_CST_RSMONMS3_ALV_STR-RIHOST sy-vline 
WA_CST_RSMONMS3_ALV_STR-RISERV sy-vline 
WA_CST_RSMONMS3_ALV_STR-STATESTR sy-vline 
WA_CST_RSMONMS3_ALV_STR-STATE sy-vline 
WA_CST_RSMONMS3_ALV_STR-TIMEOUT sy-vline 
WA_CST_RSMONMS3_ALV_STR-PROCTIME sy-vline 
WA_CST_RSMONMS3_ALV_STR-ACLFILE sy-vline      INTO ld_text SEPARATED BY SPACE.

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