ABAP Select data from SAP table /SAPAPO/MCS01 into internal table

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

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_/SAPAPO/MCS01.

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /SAPAPO/MCS01
*  INTO TABLE @DATA(IT_/SAPAPO/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_/SAPAPO/MCS01 INDEX 1 INTO DATA(WA_/SAPAPO/MCS012).


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

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

ENDLOOP.

LOOP AT IT_/SAPAPO/MCS01 INTO WA_/SAPAPO/MCS01.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/SAPAPO/MCS01-DOMNAME, sy-vline,
  WA_/SAPAPO/MCS01-ROLLNAME, sy-vline,
  WA_/SAPAPO/MCS01-CHECKTABLE, sy-vline,
  WA_/SAPAPO/MCS01-LENG, sy-vline,
  WA_/SAPAPO/MCS01-INTLEN, sy-vline,
  WA_/SAPAPO/MCS01-OUTPUTLEN, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/SAPAPO/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_/SAPAPO/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_/SAPAPO/MCS01 INTO WA_/SAPAPO/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_/SAPAPO/MCS01-LANGU
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/SAPAPO/MCS01-LANGU.
WRITE:/ 'New Value:', ld_input.

*Conversion exit DTYPE, internal->external for field DATATYPE
CALL FUNCTION 'CONVERSION_EXIT_DTYPE_OUTPUT'
  EXPORTING
    input =                      WA_/SAPAPO/MCS01-DATATYPE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/SAPAPO/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_/SAPAPO/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,
FCODE TYPE STRING,
GROUP TYPE STRING,
SORT_DOWN TYPE STRING,
FACTOR TYPE STRING,
ODECIMALS TYPE STRING,
SDECIMALS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/SAPAPO/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_/SAPAPO/MCS01_STR-TABNAME sy-vline 
WA_/SAPAPO/MCS01_STR-FIELDNAME sy-vline 
WA_/SAPAPO/MCS01_STR-LANGU sy-vline 
WA_/SAPAPO/MCS01_STR-POSITION sy-vline 
WA_/SAPAPO/MCS01_STR-OFFSET sy-vline 
WA_/SAPAPO/MCS01_STR-DOMNAME sy-vline 
WA_/SAPAPO/MCS01_STR-ROLLNAME sy-vline 
WA_/SAPAPO/MCS01_STR-CHECKTABLE sy-vline 
WA_/SAPAPO/MCS01_STR-LENG sy-vline 
WA_/SAPAPO/MCS01_STR-INTLEN sy-vline 
WA_/SAPAPO/MCS01_STR-OUTPUTLEN sy-vline 
WA_/SAPAPO/MCS01_STR-DECIMALS sy-vline 
WA_/SAPAPO/MCS01_STR-DATATYPE sy-vline 
WA_/SAPAPO/MCS01_STR-INTTYPE sy-vline 
WA_/SAPAPO/MCS01_STR-REFTABLE sy-vline 
WA_/SAPAPO/MCS01_STR-REFFIELD sy-vline 
WA_/SAPAPO/MCS01_STR-PRECFIELD sy-vline 
WA_/SAPAPO/MCS01_STR-AUTHORID sy-vline 
WA_/SAPAPO/MCS01_STR-MEMORYID sy-vline 
WA_/SAPAPO/MCS01_STR-LOGFLAG sy-vline 
WA_/SAPAPO/MCS01_STR-MASK sy-vline 
WA_/SAPAPO/MCS01_STR-MASKLEN sy-vline 
WA_/SAPAPO/MCS01_STR-CONVEXIT sy-vline 
WA_/SAPAPO/MCS01_STR-HEADLEN sy-vline 
WA_/SAPAPO/MCS01_STR-SCRLEN1 sy-vline 
WA_/SAPAPO/MCS01_STR-SCRLEN2 sy-vline 
WA_/SAPAPO/MCS01_STR-SCRLEN3 sy-vline 
WA_/SAPAPO/MCS01_STR-FIELDTEXT sy-vline 
WA_/SAPAPO/MCS01_STR-REPTEXT sy-vline 
WA_/SAPAPO/MCS01_STR-SCRTEXT_S sy-vline 
WA_/SAPAPO/MCS01_STR-SCRTEXT_M sy-vline 
WA_/SAPAPO/MCS01_STR-SCRTEXT_L sy-vline 
WA_/SAPAPO/MCS01_STR-KEYFLAG sy-vline 
WA_/SAPAPO/MCS01_STR-LOWERCASE sy-vline 
WA_/SAPAPO/MCS01_STR-MAC sy-vline 
WA_/SAPAPO/MCS01_STR-GENKEY sy-vline 
WA_/SAPAPO/MCS01_STR-NOFORKEY sy-vline 
WA_/SAPAPO/MCS01_STR-VALEXI sy-vline 
WA_/SAPAPO/MCS01_STR-NOAUTHCH sy-vline 
WA_/SAPAPO/MCS01_STR-SIGN sy-vline 
WA_/SAPAPO/MCS01_STR-DYNPFLD sy-vline 
WA_/SAPAPO/MCS01_STR-F4AVAILABL sy-vline 
WA_/SAPAPO/MCS01_STR-COMPTYPE sy-vline 
WA_/SAPAPO/MCS01_STR-LFIELDNAME sy-vline 
WA_/SAPAPO/MCS01_STR-LTRFLDDIS sy-vline 
WA_/SAPAPO/MCS01_STR-BIDICTRLC sy-vline 
WA_/SAPAPO/MCS01_STR-OUTPUTSTYLE sy-vline 
WA_/SAPAPO/MCS01_STR-NOHISTORY sy-vline 
WA_/SAPAPO/MCS01_STR-AMPMFORMAT sy-vline 
WA_/SAPAPO/MCS01_STR-TABIX sy-vline 
WA_/SAPAPO/MCS01_STR-QUTAB sy-vline 
WA_/SAPAPO/MCS01_STR-QUFNA sy-vline 
WA_/SAPAPO/MCS01_STR-SQTAB sy-vline 
WA_/SAPAPO/MCS01_STR-SQFNA sy-vline 
WA_/SAPAPO/MCS01_STR-DISPL_ONLY sy-vline 
WA_/SAPAPO/MCS01_STR-GESAMTKZ sy-vline 
WA_/SAPAPO/MCS01_STR-FCODE sy-vline 
WA_/SAPAPO/MCS01_STR-GROUP sy-vline 
WA_/SAPAPO/MCS01_STR-SORT_DOWN sy-vline 
WA_/SAPAPO/MCS01_STR-FACTOR sy-vline 
WA_/SAPAPO/MCS01_STR-ODECIMALS sy-vline 
WA_/SAPAPO/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.