ABAP Select data from SAP table HAP_S_WF_TYPE_LINKAGE into internal table

Get Example source ABAP code based on a different SAP table
  Get ABAP code

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM HAP_S_WF_TYPE_LINKAGE
*  INTO TABLE @DATA(IT_HAP_S_WF_TYPE_LINKAGE2).
*--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_HAP_S_WF_TYPE_LINKAGE INDEX 1 INTO DATA(WA_HAP_S_WF_TYPE_LINKAGE2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<HAP_S_WF_TYPE_LINKAGE>-CLIENT = 1.
<HAP_S_WF_TYPE_LINKAGE>-OBJTYPE = 1.
<HAP_S_WF_TYPE_LINKAGE>-EVENT = 1.
<HAP_S_WF_TYPE_LINKAGE>-RECTYPE = 1.
<HAP_S_WF_TYPE_LINKAGE>-RECFB = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_HAP_S_WF_TYPE_LINKAGE-CHECKFB, sy-vline,
  WA_HAP_S_WF_TYPE_LINKAGE-RECGETFB, sy-vline,
  WA_HAP_S_WF_TYPE_LINKAGE-GLOBAL, sy-vline,
  WA_HAP_S_WF_TYPE_LINKAGE-RFCDEST, sy-vline,
  WA_HAP_S_WF_TYPE_LINKAGE-LOGSYS, sy-vline,
  WA_HAP_S_WF_TYPE_LINKAGE-Q_ENABLE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_HAP_S_WF_TYPE_LINKAGE 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_HAP_S_WF_TYPE_LINKAGE 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_HAP_S_WF_TYPE_LINKAGE INTO WA_HAP_S_WF_TYPE_LINKAGE.


*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 LOGSYS
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_HAP_S_WF_TYPE_LINKAGE-LOGSYS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_HAP_S_WF_TYPE_LINKAGE-LOGSYS.
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_HAP_S_WF_TYPE_LINKAGE_STR, 
CLIENT TYPE STRING,
OBJTYPE TYPE STRING,
EVENT TYPE STRING,
RECTYPE TYPE STRING,
RECFB TYPE STRING,
CHECKFB TYPE STRING,
RECGETFB TYPE STRING,
GLOBAL TYPE STRING,
RFCDEST TYPE STRING,
LOGSYS TYPE STRING,
Q_ENABLE TYPE STRING,
REC_ERROR TYPE STRING,
ENABLED TYPE STRING,
STATUS TYPE STRING,
EVENT_DESCRIPT TYPE STRING,
EVENT_SHORTTEXT TYPE STRING,
TYPE_TEXT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_HAP_S_WF_TYPE_LINKAGE_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_HAP_S_WF_TYPE_LINKAGE_STR-CLIENT sy-vline 
WA_HAP_S_WF_TYPE_LINKAGE_STR-OBJTYPE sy-vline 
WA_HAP_S_WF_TYPE_LINKAGE_STR-EVENT sy-vline 
WA_HAP_S_WF_TYPE_LINKAGE_STR-RECTYPE sy-vline 
WA_HAP_S_WF_TYPE_LINKAGE_STR-RECFB sy-vline 
WA_HAP_S_WF_TYPE_LINKAGE_STR-CHECKFB sy-vline 
WA_HAP_S_WF_TYPE_LINKAGE_STR-RECGETFB sy-vline 
WA_HAP_S_WF_TYPE_LINKAGE_STR-GLOBAL sy-vline 
WA_HAP_S_WF_TYPE_LINKAGE_STR-RFCDEST sy-vline 
WA_HAP_S_WF_TYPE_LINKAGE_STR-LOGSYS sy-vline 
WA_HAP_S_WF_TYPE_LINKAGE_STR-Q_ENABLE sy-vline 
WA_HAP_S_WF_TYPE_LINKAGE_STR-REC_ERROR sy-vline 
WA_HAP_S_WF_TYPE_LINKAGE_STR-ENABLED sy-vline 
WA_HAP_S_WF_TYPE_LINKAGE_STR-STATUS sy-vline 
WA_HAP_S_WF_TYPE_LINKAGE_STR-EVENT_DESCRIPT sy-vline 
WA_HAP_S_WF_TYPE_LINKAGE_STR-EVENT_SHORTTEXT sy-vline 
WA_HAP_S_WF_TYPE_LINKAGE_STR-TYPE_TEXT sy-vline      INTO ld_text SEPARATED BY SPACE.

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