ABAP Select data from SAP table MCS01 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP MCS01 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 MCS01. 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 MCS01 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_MCS01 TYPE STANDARD TABLE OF MCS01,
      WA_MCS01 TYPE MCS01,
      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: <MCS01> TYPE MCS01.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_MCS01.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM MCS01
  INTO TABLE IT_MCS01.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MCS01
*  INTO TABLE @DATA(IT_MCS012).
*--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_MCS01 INDEX 1 INTO DATA(WA_MCS012).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_MCS01 ASSIGNING <MCS01>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MCS01>-TABNAME = 1.
<MCS01>-FIELDNAME = 1.
<MCS01>-LANGU = 1.
<MCS01>-POSITION = 1.
<MCS01>-OFFSET = 1.

ENDLOOP.

LOOP AT IT_MCS01 INTO WA_MCS01.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MCS01-DOMNAME, sy-vline,
  WA_MCS01-ROLLNAME, sy-vline,
  WA_MCS01-CHECKTABLE, sy-vline,
  WA_MCS01-LENG, sy-vline,
  WA_MCS01-INTLEN, sy-vline,
  WA_MCS01-OUTPUTLEN, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MCS01 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_MCS01 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_MCS01 INTO WA_MCS01.


*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 ISOLA, internal->external for field LANGU
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_MCS01-LANGU
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCS01-LANGU.
WRITE:/ 'New Value:', ld_input.

*Conversion exit DTYPE, internal->external for field DATATYPE
CALL FUNCTION 'CONVERSION_EXIT_DTYPE_OUTPUT'
  EXPORTING
    input =                      WA_MCS01-DATATYPE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCS01-DATATYPE.
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_MCS01_STR, 
TABNAME TYPE STRING,
FIELDNAME TYPE STRING,
LANGU TYPE STRING,
POSITION TYPE STRING,
OFFSET TYPE STRING,
DOMNAME TYPE STRING,
ROLLNAME TYPE STRING,
CHECKTABLE TYPE STRING,
LENG TYPE STRING,
INTLEN TYPE STRING,
OUTPUTLEN TYPE STRING,
DECIMALS TYPE STRING,
DATATYPE TYPE STRING,
INTTYPE TYPE STRING,
REFTABLE TYPE STRING,
REFFIELD TYPE STRING,
PRECFIELD TYPE STRING,
AUTHORID TYPE STRING,
MEMORYID TYPE STRING,
LOGFLAG TYPE STRING,
MASK TYPE STRING,
MASKLEN TYPE STRING,
CONVEXIT TYPE STRING,
HEADLEN TYPE STRING,
SCRLEN1 TYPE STRING,
SCRLEN2 TYPE STRING,
SCRLEN3 TYPE STRING,
FIELDTEXT TYPE STRING,
REPTEXT TYPE STRING,
SCRTEXT_S TYPE STRING,
SCRTEXT_M TYPE STRING,
SCRTEXT_L TYPE STRING,
KEYFLAG TYPE STRING,
LOWERCASE TYPE STRING,
MAC TYPE STRING,
GENKEY TYPE STRING,
NOFORKEY TYPE STRING,
VALEXI TYPE STRING,
NOAUTHCH TYPE STRING,
SIGN TYPE STRING,
DYNPFLD TYPE STRING,
F4AVAILABL TYPE STRING,
COMPTYPE TYPE STRING,
LFIELDNAME TYPE STRING,
LTRFLDDIS TYPE STRING,
BIDICTRLC TYPE STRING,
OUTPUTSTYLE TYPE STRING,
NOHISTORY TYPE STRING,
AMPMFORMAT TYPE STRING,
TABIX TYPE STRING,
QUTAB TYPE STRING,
QUFNA TYPE STRING,
SQTAB TYPE STRING,
SQFNA TYPE STRING,
DISPL_ONLY TYPE STRING,
GESAMTKZ TYPE STRING,
GRPKZ TYPE STRING,
FCODE TYPE STRING,
GROUP TYPE STRING,
SORT_DOWN TYPE STRING,
GROUPING TYPE STRING,
FACTOR TYPE STRING,
ODECIMALS TYPE STRING,
SDECIMALS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MCS01_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_MCS01_STR-TABNAME sy-vline 
WA_MCS01_STR-FIELDNAME sy-vline 
WA_MCS01_STR-LANGU sy-vline 
WA_MCS01_STR-POSITION sy-vline 
WA_MCS01_STR-OFFSET sy-vline 
WA_MCS01_STR-DOMNAME sy-vline 
WA_MCS01_STR-ROLLNAME sy-vline 
WA_MCS01_STR-CHECKTABLE sy-vline 
WA_MCS01_STR-LENG sy-vline 
WA_MCS01_STR-INTLEN sy-vline 
WA_MCS01_STR-OUTPUTLEN sy-vline 
WA_MCS01_STR-DECIMALS sy-vline 
WA_MCS01_STR-DATATYPE sy-vline 
WA_MCS01_STR-INTTYPE sy-vline 
WA_MCS01_STR-REFTABLE sy-vline 
WA_MCS01_STR-REFFIELD sy-vline 
WA_MCS01_STR-PRECFIELD sy-vline 
WA_MCS01_STR-AUTHORID sy-vline 
WA_MCS01_STR-MEMORYID sy-vline 
WA_MCS01_STR-LOGFLAG sy-vline 
WA_MCS01_STR-MASK sy-vline 
WA_MCS01_STR-MASKLEN sy-vline 
WA_MCS01_STR-CONVEXIT sy-vline 
WA_MCS01_STR-HEADLEN sy-vline 
WA_MCS01_STR-SCRLEN1 sy-vline 
WA_MCS01_STR-SCRLEN2 sy-vline 
WA_MCS01_STR-SCRLEN3 sy-vline 
WA_MCS01_STR-FIELDTEXT sy-vline 
WA_MCS01_STR-REPTEXT sy-vline 
WA_MCS01_STR-SCRTEXT_S sy-vline 
WA_MCS01_STR-SCRTEXT_M sy-vline 
WA_MCS01_STR-SCRTEXT_L sy-vline 
WA_MCS01_STR-KEYFLAG sy-vline 
WA_MCS01_STR-LOWERCASE sy-vline 
WA_MCS01_STR-MAC sy-vline 
WA_MCS01_STR-GENKEY sy-vline 
WA_MCS01_STR-NOFORKEY sy-vline 
WA_MCS01_STR-VALEXI sy-vline 
WA_MCS01_STR-NOAUTHCH sy-vline 
WA_MCS01_STR-SIGN sy-vline 
WA_MCS01_STR-DYNPFLD sy-vline 
WA_MCS01_STR-F4AVAILABL sy-vline 
WA_MCS01_STR-COMPTYPE sy-vline 
WA_MCS01_STR-LFIELDNAME sy-vline 
WA_MCS01_STR-LTRFLDDIS sy-vline 
WA_MCS01_STR-BIDICTRLC sy-vline 
WA_MCS01_STR-OUTPUTSTYLE sy-vline 
WA_MCS01_STR-NOHISTORY sy-vline 
WA_MCS01_STR-AMPMFORMAT sy-vline 
WA_MCS01_STR-TABIX sy-vline 
WA_MCS01_STR-QUTAB sy-vline 
WA_MCS01_STR-QUFNA sy-vline 
WA_MCS01_STR-SQTAB sy-vline 
WA_MCS01_STR-SQFNA sy-vline 
WA_MCS01_STR-DISPL_ONLY sy-vline 
WA_MCS01_STR-GESAMTKZ sy-vline 
WA_MCS01_STR-GRPKZ sy-vline 
WA_MCS01_STR-FCODE sy-vline 
WA_MCS01_STR-GROUP sy-vline 
WA_MCS01_STR-SORT_DOWN sy-vline 
WA_MCS01_STR-GROUPING sy-vline 
WA_MCS01_STR-FACTOR sy-vline 
WA_MCS01_STR-ODECIMALS sy-vline 
WA_MCS01_STR-SDECIMALS sy-vline      INTO ld_text SEPARATED BY SPACE.

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