ABAP Select data from SAP table MCWF_TRANS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MCWF_TRANS
*  INTO TABLE @DATA(IT_MCWF_TRANS2).
*--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_MCWF_TRANS INDEX 1 INTO DATA(WA_MCWF_TRANS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MCWF_TRANS>-WI_ID = 1.
<MCWF_TRANS>-WI_AED = 1.
<MCWF_TRANS>-WI_RH_TASK = 1.
<MCWF_TRANS>-WI_TYPE = 1.
<MCWF_TRANS>-WI_AAGENT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MCWF_TRANS-WI_ORGUNIT, sy-vline,
  WA_MCWF_TRANS-WI_ROOT, sy-vline,
  WA_MCWF_TRANS-WI_FLOW, sy-vline,
  WA_MCWF_TRANS-WI_OBJ_TYP, sy-vline,
  WA_MCWF_TRANS-WI_OBJECT, sy-vline,
  WA_MCWF_TRANS-WI_GRP_TYP, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MCWF_TRANS 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_MCWF_TRANS 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_MCWF_TRANS INTO WA_MCWF_TRANS.


*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 CUNIT, internal->external for field UNIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_MCWF_TRANS-UNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCWF_TRANS-UNIT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field QMNUM
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MCWF_TRANS-QMNUM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCWF_TRANS-QMNUM.
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_MCWF_TRANS_STR, 
WI_ID TYPE STRING,
WI_AED TYPE STRING,
WI_RH_TASK TYPE STRING,
WI_TYPE TYPE STRING,
WI_AAGENT TYPE STRING,
WI_ORGUNIT TYPE STRING,
WI_ROOT TYPE STRING,
WI_FLOW TYPE STRING,
WI_OBJ_TYP TYPE STRING,
WI_OBJECT TYPE STRING,
WI_GRP_TYP TYPE STRING,
WI_GROUP TYPE STRING,
WI_COUNT TYPE STRING,
WI_FRACT TYPE STRING,
TIME_TOTAL TYPE STRING,
TIME_MEAN TYPE STRING,
TIME_SIGMA TYPE STRING,
TAR_TOTAL TYPE STRING,
TAR_MEAN TYPE STRING,
TAR_SQUARE TYPE STRING,
TAR_SIGMA TYPE STRING,
NET_TOTAL TYPE STRING,
NET_MEAN TYPE STRING,
NET_SQUARE TYPE STRING,
NET_SIGMA TYPE STRING,
UNIT TYPE STRING,
PROCSTATE TYPE STRING,
CREATEDBY TYPE STRING,
APPROVBY TYPE STRING,
QMNUM TYPE STRING,
QMART TYPE STRING,
ARTPR TYPE STRING,
PRIOK TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MCWF_TRANS_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_MCWF_TRANS_STR-WI_ID sy-vline 
WA_MCWF_TRANS_STR-WI_AED sy-vline 
WA_MCWF_TRANS_STR-WI_RH_TASK sy-vline 
WA_MCWF_TRANS_STR-WI_TYPE sy-vline 
WA_MCWF_TRANS_STR-WI_AAGENT sy-vline 
WA_MCWF_TRANS_STR-WI_ORGUNIT sy-vline 
WA_MCWF_TRANS_STR-WI_ROOT sy-vline 
WA_MCWF_TRANS_STR-WI_FLOW sy-vline 
WA_MCWF_TRANS_STR-WI_OBJ_TYP sy-vline 
WA_MCWF_TRANS_STR-WI_OBJECT sy-vline 
WA_MCWF_TRANS_STR-WI_GRP_TYP sy-vline 
WA_MCWF_TRANS_STR-WI_GROUP sy-vline 
WA_MCWF_TRANS_STR-WI_COUNT sy-vline 
WA_MCWF_TRANS_STR-WI_FRACT sy-vline 
WA_MCWF_TRANS_STR-TIME_TOTAL sy-vline 
WA_MCWF_TRANS_STR-TIME_MEAN sy-vline 
WA_MCWF_TRANS_STR-TIME_SIGMA sy-vline 
WA_MCWF_TRANS_STR-TAR_TOTAL sy-vline 
WA_MCWF_TRANS_STR-TAR_MEAN sy-vline 
WA_MCWF_TRANS_STR-TAR_SQUARE sy-vline 
WA_MCWF_TRANS_STR-TAR_SIGMA sy-vline 
WA_MCWF_TRANS_STR-NET_TOTAL sy-vline 
WA_MCWF_TRANS_STR-NET_MEAN sy-vline 
WA_MCWF_TRANS_STR-NET_SQUARE sy-vline 
WA_MCWF_TRANS_STR-NET_SIGMA sy-vline 
WA_MCWF_TRANS_STR-UNIT sy-vline 
WA_MCWF_TRANS_STR-PROCSTATE sy-vline 
WA_MCWF_TRANS_STR-CREATEDBY sy-vline 
WA_MCWF_TRANS_STR-APPROVBY sy-vline 
WA_MCWF_TRANS_STR-QMNUM sy-vline 
WA_MCWF_TRANS_STR-QMART sy-vline 
WA_MCWF_TRANS_STR-ARTPR sy-vline 
WA_MCWF_TRANS_STR-PRIOK sy-vline      INTO ld_text SEPARATED BY SPACE.

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