ABAP Select data from SAP table CSMSMESCUS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CSMSMESCUS
*  INTO TABLE @DATA(IT_CSMSMESCUS2).
*--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_CSMSMESCUS INDEX 1 INTO DATA(WA_CSMSMESCUS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CSMSMESCUS>-MTSYSID = 1.
<CSMSMESCUS>-MTMCNAME = 1.
<CSMSMESCUS>-MTNUMRANGE = 1.
<CSMSMESCUS>-MTUID = 1.
<CSMSMESCUS>-MTCLASS = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CSMSMESCUS-MTINDEX, sy-vline,
  WA_CSMSMESCUS-EXTINDEX, sy-vline,
  WA_CSMSMESCUS-CUSTSTAT, sy-vline,
  WA_CSMSMESCUS-ALERTMODE, sy-vline,
  WA_CSMSMESCUS-ALERTSHIFT, sy-vline,
  WA_CSMSMESCUS-CUSGRPNAME, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CSMSMESCUS 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_CSMSMESCUS 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_CSMSMESCUS INTO WA_CSMSMESCUS.


*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_CSMSMESCUS_STR, 
MTSYSID TYPE STRING,
MTMCNAME TYPE STRING,
MTNUMRANGE TYPE STRING,
MTUID TYPE STRING,
MTCLASS TYPE STRING,
MTINDEX TYPE STRING,
EXTINDEX TYPE STRING,
CUSTSTAT TYPE STRING,
ALERTMODE TYPE STRING,
ALERTSHIFT TYPE STRING,
CUSGRPNAME TYPE STRING,
RC TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CSMSMESCUS_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_CSMSMESCUS_STR-MTSYSID sy-vline 
WA_CSMSMESCUS_STR-MTMCNAME sy-vline 
WA_CSMSMESCUS_STR-MTNUMRANGE sy-vline 
WA_CSMSMESCUS_STR-MTUID sy-vline 
WA_CSMSMESCUS_STR-MTCLASS sy-vline 
WA_CSMSMESCUS_STR-MTINDEX sy-vline 
WA_CSMSMESCUS_STR-EXTINDEX sy-vline 
WA_CSMSMESCUS_STR-CUSTSTAT sy-vline 
WA_CSMSMESCUS_STR-ALERTMODE sy-vline 
WA_CSMSMESCUS_STR-ALERTSHIFT sy-vline 
WA_CSMSMESCUS_STR-CUSGRPNAME sy-vline 
WA_CSMSMESCUS_STR-RC sy-vline      INTO ld_text SEPARATED BY SPACE.

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