ABAP Select data from SAP table SAPWLTSKD into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM SAPWLTSKD
*  INTO TABLE @DATA(IT_SAPWLTSKD2).
*--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_SAPWLTSKD INDEX 1 INTO DATA(WA_SAPWLTSKD2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<SAPWLTSKD>-TASKTYPE = 1.
<SAPWLTSKD>-TIME = 1.
<SAPWLTSKD>-COUNT = 1.
<SAPWLTSKD>-CNT001 = 1.
<SAPWLTSKD>-CNT002 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_SAPWLTSKD-CNT003, sy-vline,
  WA_SAPWLTSKD-CNT004, sy-vline,
  WA_SAPWLTSKD-CNT005, sy-vline,
  WA_SAPWLTSKD-CNT006, sy-vline,
  WA_SAPWLTSKD-CNT007, sy-vline,
  WA_SAPWLTSKD-CNT008, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_SAPWLTSKD 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_SAPWLTSKD 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_SAPWLTSKD INTO WA_SAPWLTSKD.


*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_SAPWLTSKD_STR, 
TASKTYPE TYPE STRING,
TIME TYPE STRING,
COUNT TYPE STRING,
CNT001 TYPE STRING,
CNT002 TYPE STRING,
CNT003 TYPE STRING,
CNT004 TYPE STRING,
CNT005 TYPE STRING,
CNT006 TYPE STRING,
CNT007 TYPE STRING,
CNT008 TYPE STRING,
CNT009 TYPE STRING,
CNT010 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_SAPWLTSKD_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_SAPWLTSKD_STR-TASKTYPE sy-vline 
WA_SAPWLTSKD_STR-TIME sy-vline 
WA_SAPWLTSKD_STR-COUNT sy-vline 
WA_SAPWLTSKD_STR-CNT001 sy-vline 
WA_SAPWLTSKD_STR-CNT002 sy-vline 
WA_SAPWLTSKD_STR-CNT003 sy-vline 
WA_SAPWLTSKD_STR-CNT004 sy-vline 
WA_SAPWLTSKD_STR-CNT005 sy-vline 
WA_SAPWLTSKD_STR-CNT006 sy-vline 
WA_SAPWLTSKD_STR-CNT007 sy-vline 
WA_SAPWLTSKD_STR-CNT008 sy-vline 
WA_SAPWLTSKD_STR-CNT009 sy-vline 
WA_SAPWLTSKD_STR-CNT010 sy-vline      INTO ld_text SEPARATED BY SPACE.

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