ABAP Select data from SAP table WFAFCS_MANDATORY_SCREEN into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WFAFCS_MANDATORY_SCREEN
*  INTO TABLE @DATA(IT_WFAFCS_MANDATORY_SCREEN2).
*--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_WFAFCS_MANDATORY_SCREEN INDEX 1 INTO DATA(WA_WFAFCS_MANDATORY_SCREEN2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WFAFCS_MANDATORY_SCREEN>-SNAME = 1.
<WFAFCS_MANDATORY_SCREEN>-LNAME = 1.
<WFAFCS_MANDATORY_SCREEN>-VISIBILITY = 1.
<WFAFCS_MANDATORY_SCREEN>-INDICATOR_ID = 1.
<WFAFCS_MANDATORY_SCREEN>-IND_EXT_KEY = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WFAFCS_MANDATORY_SCREEN-WL_SNAME, sy-vline,
  WA_WFAFCS_MANDATORY_SCREEN-START_DATE, sy-vline,
  WA_WFAFCS_MANDATORY_SCREEN-END_DATE, sy-vline,
  WA_WFAFCS_MANDATORY_SCREEN-IMPORT_WORKLOAD, sy-vline,
  WA_WFAFCS_MANDATORY_SCREEN-STEP_VOLIND_EXT, sy-vline,
  WA_WFAFCS_MANDATORY_SCREEN-TEMPLATE_AT_MAX, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WFAFCS_MANDATORY_SCREEN 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_WFAFCS_MANDATORY_SCREEN 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_WFAFCS_MANDATORY_SCREEN INTO WA_WFAFCS_MANDATORY_SCREEN.


*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_WFAFCS_MANDATORY_SCREEN_STR, 
SNAME TYPE STRING,
LNAME TYPE STRING,
VISIBILITY TYPE STRING,
INDICATOR_ID TYPE STRING,
IND_EXT_KEY TYPE STRING,
WL_SNAME TYPE STRING,
START_DATE TYPE STRING,
END_DATE TYPE STRING,
IMPORT_WORKLOAD TYPE STRING,
STEP_VOLIND_EXT TYPE STRING,
TEMPLATE_AT_MAX TYPE STRING,
DEFAULT_TEMPLATE TYPE STRING,
EARNED_HOURS TYPE STRING,
STEP_VOLUME TYPE STRING,
TASKHOURSTYPE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WFAFCS_MANDATORY_SCREEN_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_WFAFCS_MANDATORY_SCREEN_STR-SNAME sy-vline 
WA_WFAFCS_MANDATORY_SCREEN_STR-LNAME sy-vline 
WA_WFAFCS_MANDATORY_SCREEN_STR-VISIBILITY sy-vline 
WA_WFAFCS_MANDATORY_SCREEN_STR-INDICATOR_ID sy-vline 
WA_WFAFCS_MANDATORY_SCREEN_STR-IND_EXT_KEY sy-vline 
WA_WFAFCS_MANDATORY_SCREEN_STR-WL_SNAME sy-vline 
WA_WFAFCS_MANDATORY_SCREEN_STR-START_DATE sy-vline 
WA_WFAFCS_MANDATORY_SCREEN_STR-END_DATE sy-vline 
WA_WFAFCS_MANDATORY_SCREEN_STR-IMPORT_WORKLOAD sy-vline 
WA_WFAFCS_MANDATORY_SCREEN_STR-STEP_VOLIND_EXT sy-vline 
WA_WFAFCS_MANDATORY_SCREEN_STR-TEMPLATE_AT_MAX sy-vline 
WA_WFAFCS_MANDATORY_SCREEN_STR-DEFAULT_TEMPLATE sy-vline 
WA_WFAFCS_MANDATORY_SCREEN_STR-EARNED_HOURS sy-vline 
WA_WFAFCS_MANDATORY_SCREEN_STR-STEP_VOLUME sy-vline 
WA_WFAFCS_MANDATORY_SCREEN_STR-TASKHOURSTYPE sy-vline      INTO ld_text SEPARATED BY SPACE.

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