ABAP Select data from SAP table MSSTASK into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MSSTASK
*  INTO TABLE @DATA(IT_MSSTASK2).
*--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_MSSTASK INDEX 1 INTO DATA(WA_MSSTASK2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MSSTASK>-TASKID = 1.
<MSSTASK>-TASKNAME = 1.
<MSSTASK>-SUBSYSTEM = 1.
<MSSTASK>-SERVER = 1.
<MSSTASK>-USERNAME = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MSSTASK-OWNERLOGIN, sy-vline,
  WA_MSSTASK-DBNAME, sy-vline,
  WA_MSSTASK-ENABLED, sy-vline,
  WA_MSSTASK-FREQTYPE, sy-vline,
  WA_MSSTASK-FREQINTER, sy-vline,
  WA_MSSTASK-FREQSUBTYP, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MSSTASK 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_MSSTASK 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_MSSTASK INTO WA_MSSTASK.


*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_MSSTASK_STR, 
TASKID TYPE STRING,
TASKNAME TYPE STRING,
SUBSYSTEM TYPE STRING,
SERVER TYPE STRING,
USERNAME TYPE STRING,
OWNERLOGIN TYPE STRING,
DBNAME TYPE STRING,
ENABLED TYPE STRING,
FREQTYPE TYPE STRING,
FREQINTER TYPE STRING,
FREQSUBTYP TYPE STRING,
FREQSUBINT TYPE STRING,
FREQRELINT TYPE STRING,
FREQRECFAC TYPE STRING,
ACTSTRTDAT TYPE STRING,
ACTENDDATE TYPE STRING,
ACTSTRTTOD TYPE STRING,
LASTRUNDAT TYPE STRING,
LASTRUNTIM TYPE STRING,
NEXTRUNDAT TYPE STRING,
NEXTRUNTIM TYPE STRING,
RUNPRIO TYPE STRING,
RETRYATTEM TYPE STRING,
RETRYDELAY TYPE STRING,
CREATEDATE TYPE STRING,
MODIFYDATE TYPE STRING,
COMMAND TYPE STRING,
LASTLEVEL TYPE STRING,
LASTDURATE TYPE STRING,
LASTNUMRET TYPE STRING,
DESCRIPT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MSSTASK_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_MSSTASK_STR-TASKID sy-vline 
WA_MSSTASK_STR-TASKNAME sy-vline 
WA_MSSTASK_STR-SUBSYSTEM sy-vline 
WA_MSSTASK_STR-SERVER sy-vline 
WA_MSSTASK_STR-USERNAME sy-vline 
WA_MSSTASK_STR-OWNERLOGIN sy-vline 
WA_MSSTASK_STR-DBNAME sy-vline 
WA_MSSTASK_STR-ENABLED sy-vline 
WA_MSSTASK_STR-FREQTYPE sy-vline 
WA_MSSTASK_STR-FREQINTER sy-vline 
WA_MSSTASK_STR-FREQSUBTYP sy-vline 
WA_MSSTASK_STR-FREQSUBINT sy-vline 
WA_MSSTASK_STR-FREQRELINT sy-vline 
WA_MSSTASK_STR-FREQRECFAC sy-vline 
WA_MSSTASK_STR-ACTSTRTDAT sy-vline 
WA_MSSTASK_STR-ACTENDDATE sy-vline 
WA_MSSTASK_STR-ACTSTRTTOD sy-vline 
WA_MSSTASK_STR-LASTRUNDAT sy-vline 
WA_MSSTASK_STR-LASTRUNTIM sy-vline 
WA_MSSTASK_STR-NEXTRUNDAT sy-vline 
WA_MSSTASK_STR-NEXTRUNTIM sy-vline 
WA_MSSTASK_STR-RUNPRIO sy-vline 
WA_MSSTASK_STR-RETRYATTEM sy-vline 
WA_MSSTASK_STR-RETRYDELAY sy-vline 
WA_MSSTASK_STR-CREATEDATE sy-vline 
WA_MSSTASK_STR-MODIFYDATE sy-vline 
WA_MSSTASK_STR-COMMAND sy-vline 
WA_MSSTASK_STR-LASTLEVEL sy-vline 
WA_MSSTASK_STR-LASTDURATE sy-vline 
WA_MSSTASK_STR-LASTNUMRET sy-vline 
WA_MSSTASK_STR-DESCRIPT sy-vline      INTO ld_text SEPARATED BY SPACE.

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