ABAP Select data from SAP table WFAS_AGT into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WFAS_AGT
*  INTO TABLE @DATA(IT_WFAS_AGT2).
*--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_WFAS_AGT INDEX 1 INTO DATA(WA_WFAS_AGT2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WFAS_AGT>-MANDT = 1.
<WFAS_AGT>-PARTNER = 1.
<WFAS_AGT>-START_DATE = 1.
<WFAS_AGT>-END_DATE = 1.
<WFAS_AGT>-TEMP_FLAG = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WFAS_AGT-BUPA_EXTKEY, sy-vline,
  WA_WFAS_AGT-AGT_HIST_GUID, sy-vline,
  WA_WFAS_AGT-SEQUENCE_NUM, sy-vline,
  WA_WFAS_AGT-DEFAULT_PAY, sy-vline,
  WA_WFAS_AGT-CURR_KEY, sy-vline,
  WA_WFAS_AGT-IS_MULT_PAY, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WFAS_AGT 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_WFAS_AGT 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_WFAS_AGT INTO WA_WFAS_AGT.


*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 PARTNER
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_WFAS_AGT-PARTNER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WFAS_AGT-PARTNER.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field BUPA_EXTKEY
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_WFAS_AGT-BUPA_EXTKEY
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WFAS_AGT-BUPA_EXTKEY.
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_WFAS_AGT_STR, 
MANDT TYPE STRING,
PARTNER TYPE STRING,
START_DATE TYPE STRING,
END_DATE TYPE STRING,
TEMP_FLAG TYPE STRING,
BUPA_EXTKEY TYPE STRING,
AGT_HIST_GUID TYPE STRING,
SEQUENCE_NUM TYPE STRING,
DEFAULT_PAY TYPE STRING,
CURR_KEY TYPE STRING,
IS_MULT_PAY TYPE STRING,
AGT_START_DATE TYPE STRING,
HIRE_DATE TYPE STRING,
TERMINATION_DATE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WFAS_AGT_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_WFAS_AGT_STR-MANDT sy-vline 
WA_WFAS_AGT_STR-PARTNER sy-vline 
WA_WFAS_AGT_STR-START_DATE sy-vline 
WA_WFAS_AGT_STR-END_DATE sy-vline 
WA_WFAS_AGT_STR-TEMP_FLAG sy-vline 
WA_WFAS_AGT_STR-BUPA_EXTKEY sy-vline 
WA_WFAS_AGT_STR-AGT_HIST_GUID sy-vline 
WA_WFAS_AGT_STR-SEQUENCE_NUM sy-vline 
WA_WFAS_AGT_STR-DEFAULT_PAY sy-vline 
WA_WFAS_AGT_STR-CURR_KEY sy-vline 
WA_WFAS_AGT_STR-IS_MULT_PAY sy-vline 
WA_WFAS_AGT_STR-AGT_START_DATE sy-vline 
WA_WFAS_AGT_STR-HIRE_DATE sy-vline 
WA_WFAS_AGT_STR-TERMINATION_DATE sy-vline      INTO ld_text SEPARATED BY SPACE.

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