ABAP Select data from SAP table WFA_ACT_SEG into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WFA_ACT_SEG
*  INTO TABLE @DATA(IT_WFA_ACT_SEG2).
*--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_WFA_ACT_SEG INDEX 1 INTO DATA(WA_WFA_ACT_SEG2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WFA_ACT_SEG>-MANDT = 1.
<WFA_ACT_SEG>-SHIFT_SEG_ID = 1.
<WFA_ACT_SEG>-SHIFT_ID = 1.
<WFA_ACT_SEG>-BRK_LOC = 1.
<WFA_ACT_SEG>-BRKTYPE_ID = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WFA_ACT_SEG-WRKAREA_ID, sy-vline,
  WA_WFA_ACT_SEG-EVENT_ID, sy-vline,
  WA_WFA_ACT_SEG-SEG_STARTTIME, sy-vline,
  WA_WFA_ACT_SEG-SEG_ENDTIME, sy-vline,
  WA_WFA_ACT_SEG-SEG_START_DATE, sy-vline,
  WA_WFA_ACT_SEG-SEG_END_DATE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WFA_ACT_SEG 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_WFA_ACT_SEG 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_WFA_ACT_SEG INTO WA_WFA_ACT_SEG.


*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 ALPHA, internal->external for field BRK_LOC
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_WFA_ACT_SEG-BRK_LOC
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WFA_ACT_SEG-BRK_LOC.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field BRKTYPE_ID
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_WFA_ACT_SEG-BRKTYPE_ID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WFA_ACT_SEG-BRKTYPE_ID.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field WORK_HRS_UNIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_WFA_ACT_SEG-WORK_HRS_UNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WFA_ACT_SEG-WORK_HRS_UNIT.
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_WFA_ACT_SEG_STR, 
MANDT TYPE STRING,
SHIFT_SEG_ID TYPE STRING,
SHIFT_ID TYPE STRING,
BRK_LOC TYPE STRING,
BRKTYPE_ID TYPE STRING,
WRKAREA_ID TYPE STRING,
EVENT_ID TYPE STRING,
SEG_STARTTIME TYPE STRING,
SEG_ENDTIME TYPE STRING,
SEG_START_DATE TYPE STRING,
SEG_END_DATE TYPE STRING,
CHARGE_DATE TYPE STRING,
SEG_PAY TYPE STRING,
CURR_CODE TYPE STRING,
SEG_PAID_FLAG TYPE STRING,
REGULAR_HRS TYPE STRING,
WORK_HRS_UNIT TYPE STRING,
REGULAR_PAY TYPE STRING,
OVERTIME_HRS TYPE STRING,
OVERTIME_PAY TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WFA_ACT_SEG_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_WFA_ACT_SEG_STR-MANDT sy-vline 
WA_WFA_ACT_SEG_STR-SHIFT_SEG_ID sy-vline 
WA_WFA_ACT_SEG_STR-SHIFT_ID sy-vline 
WA_WFA_ACT_SEG_STR-BRK_LOC sy-vline 
WA_WFA_ACT_SEG_STR-BRKTYPE_ID sy-vline 
WA_WFA_ACT_SEG_STR-WRKAREA_ID sy-vline 
WA_WFA_ACT_SEG_STR-EVENT_ID sy-vline 
WA_WFA_ACT_SEG_STR-SEG_STARTTIME sy-vline 
WA_WFA_ACT_SEG_STR-SEG_ENDTIME sy-vline 
WA_WFA_ACT_SEG_STR-SEG_START_DATE sy-vline 
WA_WFA_ACT_SEG_STR-SEG_END_DATE sy-vline 
WA_WFA_ACT_SEG_STR-CHARGE_DATE sy-vline 
WA_WFA_ACT_SEG_STR-SEG_PAY sy-vline 
WA_WFA_ACT_SEG_STR-CURR_CODE sy-vline 
WA_WFA_ACT_SEG_STR-SEG_PAID_FLAG sy-vline 
WA_WFA_ACT_SEG_STR-REGULAR_HRS sy-vline 
WA_WFA_ACT_SEG_STR-WORK_HRS_UNIT sy-vline 
WA_WFA_ACT_SEG_STR-REGULAR_PAY sy-vline 
WA_WFA_ACT_SEG_STR-OVERTIME_HRS sy-vline 
WA_WFA_ACT_SEG_STR-OVERTIME_PAY sy-vline      INTO ld_text SEPARATED BY SPACE.

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