ABAP Select data from SAP table CST_RSMONMS1_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_RSMONMS1_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_RSMONMS1_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_RSMONMS1_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_RSMONMS1_ALV TYPE STANDARD TABLE OF CST_RSMONMS1_ALV,
      WA_CST_RSMONMS1_ALV TYPE CST_RSMONMS1_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_RSMONMS1_ALV> TYPE CST_RSMONMS1_ALV.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_CST_RSMONMS1_ALV.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM CST_RSMONMS1_ALV
  INTO TABLE IT_CST_RSMONMS1_ALV.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CST_RSMONMS1_ALV
*  INTO TABLE @DATA(IT_CST_RSMONMS1_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_RSMONMS1_ALV INDEX 1 INTO DATA(WA_CST_RSMONMS1_ALV2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_CST_RSMONMS1_ALV ASSIGNING <CST_RSMONMS1_ALV>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CST_RSMONMS1_ALV>-NAME = 1.
<CST_RSMONMS1_ALV>-HOST = 1.
<CST_RSMONMS1_ALV>-SERV = 1.
<CST_RSMONMS1_ALV>-MSGTYPES = 1.
<CST_RSMONMS1_ALV>-HOSTADR = 1.

ENDLOOP.

LOOP AT IT_CST_RSMONMS1_ALV INTO WA_CST_RSMONMS1_ALV.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CST_RSMONMS1_ALV-SERVNO, sy-vline,
  WA_CST_RSMONMS1_ALV-STATE, sy-vline,
  WA_CST_RSMONMS1_ALV-HOSTNAMELONG, sy-vline,
  WA_CST_RSMONMS1_ALV-HOSTADDR_V4_STR, sy-vline,
  WA_CST_RSMONMS1_ALV-HOSTADDR_V6_STR, sy-vline,
  WA_CST_RSMONMS1_ALV-SYSSERVICE0, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CST_RSMONMS1_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_RSMONMS1_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_RSMONMS1_ALV INTO WA_CST_RSMONMS1_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.

*Conversion exit IPADD, internal->external for field HOSTADDR_V4_STR
CALL FUNCTION 'CONVERSION_EXIT_IPADD_OUTPUT'
  EXPORTING
    input =                      WA_CST_RSMONMS1_ALV-HOSTADDR_V4_STR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CST_RSMONMS1_ALV-HOSTADDR_V4_STR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit IPADD, internal->external for field HOSTADDR_V6_STR
CALL FUNCTION 'CONVERSION_EXIT_IPADD_OUTPUT'
  EXPORTING
    input =                      WA_CST_RSMONMS1_ALV-HOSTADDR_V6_STR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CST_RSMONMS1_ALV-HOSTADDR_V6_STR.
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_CST_RSMONMS1_ALV_STR, 
NAME TYPE STRING,
HOST TYPE STRING,
SERV TYPE STRING,
MSGTYPES TYPE STRING,
HOSTADR TYPE STRING,
SERVNO TYPE STRING,
STATE TYPE STRING,
HOSTNAMELONG TYPE STRING,
HOSTADDR_V4_STR TYPE STRING,
HOSTADDR_V6_STR TYPE STRING,
SYSSERVICE0 TYPE STRING,
SYSSERVICE1 TYPE STRING,
SYSSERVICE2 TYPE STRING,
SYSSERVICE3 TYPE STRING,
SELECTED TYPE STRING,
SERVICES TYPE STRING,
SERVSTR TYPE STRING,
SERVINT TYPE STRING,
STATUS TYPE STRING,
TRC TYPE STRING,
CTRC TYPE STRING,
SUBSYSTEM TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CST_RSMONMS1_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_RSMONMS1_ALV_STR-NAME sy-vline 
WA_CST_RSMONMS1_ALV_STR-HOST sy-vline 
WA_CST_RSMONMS1_ALV_STR-SERV sy-vline 
WA_CST_RSMONMS1_ALV_STR-MSGTYPES sy-vline 
WA_CST_RSMONMS1_ALV_STR-HOSTADR sy-vline 
WA_CST_RSMONMS1_ALV_STR-SERVNO sy-vline 
WA_CST_RSMONMS1_ALV_STR-STATE sy-vline 
WA_CST_RSMONMS1_ALV_STR-HOSTNAMELONG sy-vline 
WA_CST_RSMONMS1_ALV_STR-HOSTADDR_V4_STR sy-vline 
WA_CST_RSMONMS1_ALV_STR-HOSTADDR_V6_STR sy-vline 
WA_CST_RSMONMS1_ALV_STR-SYSSERVICE0 sy-vline 
WA_CST_RSMONMS1_ALV_STR-SYSSERVICE1 sy-vline 
WA_CST_RSMONMS1_ALV_STR-SYSSERVICE2 sy-vline 
WA_CST_RSMONMS1_ALV_STR-SYSSERVICE3 sy-vline 
WA_CST_RSMONMS1_ALV_STR-SELECTED sy-vline 
WA_CST_RSMONMS1_ALV_STR-SERVICES sy-vline 
WA_CST_RSMONMS1_ALV_STR-SERVSTR sy-vline 
WA_CST_RSMONMS1_ALV_STR-SERVINT sy-vline 
WA_CST_RSMONMS1_ALV_STR-STATUS sy-vline 
WA_CST_RSMONMS1_ALV_STR-TRC sy-vline 
WA_CST_RSMONMS1_ALV_STR-CTRC sy-vline 
WA_CST_RSMONMS1_ALV_STR-SUBSYSTEM sy-vline      INTO ld_text SEPARATED BY SPACE.

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