ABAP Select data from SAP table WFP_PROTOCOL into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WFP_PROTOCOL
*  INTO TABLE @DATA(IT_WFP_PROTOCOL2).
*--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_WFP_PROTOCOL INDEX 1 INTO DATA(WA_WFP_PROTOCOL2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WFP_PROTOCOL>-OTYPE = 1.
<WFP_PROTOCOL>-OBJID = 1.
<WFP_PROTOCOL>-DATUM = 1.
<WFP_PROTOCOL>-SHORT = 1.
<WFP_PROTOCOL>-STEXT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WFP_PROTOCOL-AWART, sy-vline,
  WA_WFP_PROTOCOL-AWTYP, sy-vline,
  WA_WFP_PROTOCOL-STNBY, sy-vline,
  WA_WFP_PROTOCOL-TPROG, sy-vline,
  WA_WFP_PROTOCOL-VARIA, sy-vline,
  WA_WFP_PROTOCOL-BEGZT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WFP_PROTOCOL 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_WFP_PROTOCOL 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_WFP_PROTOCOL INTO WA_WFP_PROTOCOL.


*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_WFP_PROTOCOL_STR, 
OTYPE TYPE STRING,
OBJID TYPE STRING,
DATUM TYPE STRING,
SHORT TYPE STRING,
STEXT TYPE STRING,
AWART TYPE STRING,
AWTYP TYPE STRING,
STNBY TYPE STRING,
TPROG TYPE STRING,
VARIA TYPE STRING,
BEGZT TYPE STRING,
ENDZT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WFP_PROTOCOL_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_WFP_PROTOCOL_STR-OTYPE sy-vline 
WA_WFP_PROTOCOL_STR-OBJID sy-vline 
WA_WFP_PROTOCOL_STR-DATUM sy-vline 
WA_WFP_PROTOCOL_STR-SHORT sy-vline 
WA_WFP_PROTOCOL_STR-STEXT sy-vline 
WA_WFP_PROTOCOL_STR-AWART sy-vline 
WA_WFP_PROTOCOL_STR-AWTYP sy-vline 
WA_WFP_PROTOCOL_STR-STNBY sy-vline 
WA_WFP_PROTOCOL_STR-TPROG sy-vline 
WA_WFP_PROTOCOL_STR-VARIA sy-vline 
WA_WFP_PROTOCOL_STR-BEGZT sy-vline 
WA_WFP_PROTOCOL_STR-ENDZT sy-vline      INTO ld_text SEPARATED BY SPACE.

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