ABAP Select data from SAP table MCYC into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MCYC
*  INTO TABLE @DATA(IT_MCYC2).
*--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_MCYC INDEX 1 INTO DATA(WA_MCYC2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MCYC>-MANDT = 1.
<MCYC>-EXCEP = 1.
<MCYC>-ZAEHL = 1.
<MCYC>-FNAME = 1.
<MCYC>-VALLOW = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MCYC-VALHIGH, sy-vline,
  WA_MCYC-VALSIGN, sy-vline,
  WA_MCYC-VALOPTION, sy-vline,
  WA_MCYC-VALLOWC, sy-vline,
  WA_MCYC-VALHIGHC, sy-vline,
  WA_MCYC-TREND, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MCYC 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_MCYC 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_MCYC INTO WA_MCYC.


*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_MCYC_STR, 
MANDT TYPE STRING,
EXCEP TYPE STRING,
ZAEHL TYPE STRING,
FNAME TYPE STRING,
VALLOW TYPE STRING,
VALHIGH TYPE STRING,
VALSIGN TYPE STRING,
VALOPTION TYPE STRING,
VALLOWC TYPE STRING,
VALHIGHC TYPE STRING,
TREND TYPE STRING,
KZWERT TYPE STRING,
KZPIV TYPE STRING,
VRSIO TYPE STRING,
ANZPER TYPE STRING,
STATI TYPE STRING,
SINGL TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MCYC_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_MCYC_STR-MANDT sy-vline 
WA_MCYC_STR-EXCEP sy-vline 
WA_MCYC_STR-ZAEHL sy-vline 
WA_MCYC_STR-FNAME sy-vline 
WA_MCYC_STR-VALLOW sy-vline 
WA_MCYC_STR-VALHIGH sy-vline 
WA_MCYC_STR-VALSIGN sy-vline 
WA_MCYC_STR-VALOPTION sy-vline 
WA_MCYC_STR-VALLOWC sy-vline 
WA_MCYC_STR-VALHIGHC sy-vline 
WA_MCYC_STR-TREND sy-vline 
WA_MCYC_STR-KZWERT sy-vline 
WA_MCYC_STR-KZPIV sy-vline 
WA_MCYC_STR-VRSIO sy-vline 
WA_MCYC_STR-ANZPER sy-vline 
WA_MCYC_STR-STATI sy-vline 
WA_MCYC_STR-SINGL sy-vline      INTO ld_text SEPARATED BY SPACE.

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