ABAP Select data from SAP table CMAINTTASKLISTQW into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CMAINTTASKLISTQW
*  INTO TABLE @DATA(IT_CMAINTTASKLISTQW2).
*--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_CMAINTTASKLISTQW INDEX 1 INTO DATA(WA_CMAINTTASKLISTQW2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CMAINTTASKLISTQW>-MANDT = 1.
<CMAINTTASKLISTQW>-TASKLISTTYPE = 1.
<CMAINTTASKLISTQW>-TASKLISTGROUP = 1.
<CMAINTTASKLISTQW>-TASKLISTGROUPCOUNTER = 1.
<CMAINTTASKLISTQW>-TASKLIST = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CMAINTTASKLISTQW-TASKLISTDESC, sy-vline,
  WA_CMAINTTASKLISTQW-BILLOFOPERATIONSTYPENAME, sy-vline,
  WA_CMAINTTASKLISTQW-PLANT, sy-vline,
  WA_CMAINTTASKLISTQW-PLANTNAME, sy-vline,
  WA_CMAINTTASKLISTQW-TASKLISTSTATUS, sy-vline,
  WA_CMAINTTASKLISTQW-TASKLISTSTATUSDESC, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CMAINTTASKLISTQW 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_CMAINTTASKLISTQW 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_CMAINTTASKLISTQW INTO WA_CMAINTTASKLISTQW.


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

*Conversion exit ALPHA, internal->external for field TASKLISTGROUPCOUNTER
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_CMAINTTASKLISTQW-TASKLISTGROUPCOUNTER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CMAINTTASKLISTQW-TASKLISTGROUPCOUNTER.
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_CMAINTTASKLISTQW_STR, 
MANDT TYPE STRING,
TASKLISTTYPE TYPE STRING,
TASKLISTGROUP TYPE STRING,
TASKLISTGROUPCOUNTER TYPE STRING,
TASKLIST TYPE STRING,
TASKLISTDESC TYPE STRING,
BILLOFOPERATIONSTYPENAME TYPE STRING,
PLANT TYPE STRING,
PLANTNAME TYPE STRING,
TASKLISTSTATUS TYPE STRING,
TASKLISTSTATUSDESC TYPE STRING,
WORKCENTERINTERNALID TYPE STRING,
WORKCENTERTEXT TYPE STRING,
KEYDATE TYPE STRING,
MAINTENANCESTRATEGY TYPE STRING,
MAINTENANCESTRATEGYDESC TYPE STRING,
LONGTEXT TYPE STRING,
WORKCENTERPLANT TYPE STRING,
WORKCENTERPLANTNAME TYPE STRING,
RESPONSIBLEPLANNERGROUP TYPE STRING,
RESPONSIBLEPLANNERGROUPNAME TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CMAINTTASKLISTQW_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_CMAINTTASKLISTQW_STR-MANDT sy-vline 
WA_CMAINTTASKLISTQW_STR-TASKLISTTYPE sy-vline 
WA_CMAINTTASKLISTQW_STR-TASKLISTGROUP sy-vline 
WA_CMAINTTASKLISTQW_STR-TASKLISTGROUPCOUNTER sy-vline 
WA_CMAINTTASKLISTQW_STR-TASKLIST sy-vline 
WA_CMAINTTASKLISTQW_STR-TASKLISTDESC sy-vline 
WA_CMAINTTASKLISTQW_STR-BILLOFOPERATIONSTYPENAME sy-vline 
WA_CMAINTTASKLISTQW_STR-PLANT sy-vline 
WA_CMAINTTASKLISTQW_STR-PLANTNAME sy-vline 
WA_CMAINTTASKLISTQW_STR-TASKLISTSTATUS sy-vline 
WA_CMAINTTASKLISTQW_STR-TASKLISTSTATUSDESC sy-vline 
WA_CMAINTTASKLISTQW_STR-WORKCENTERINTERNALID sy-vline 
WA_CMAINTTASKLISTQW_STR-WORKCENTERTEXT sy-vline 
WA_CMAINTTASKLISTQW_STR-KEYDATE sy-vline 
WA_CMAINTTASKLISTQW_STR-MAINTENANCESTRATEGY sy-vline 
WA_CMAINTTASKLISTQW_STR-MAINTENANCESTRATEGYDESC sy-vline 
WA_CMAINTTASKLISTQW_STR-LONGTEXT sy-vline 
WA_CMAINTTASKLISTQW_STR-WORKCENTERPLANT sy-vline 
WA_CMAINTTASKLISTQW_STR-WORKCENTERPLANTNAME sy-vline 
WA_CMAINTTASKLISTQW_STR-RESPONSIBLEPLANNERGROUP sy-vline 
WA_CMAINTTASKLISTQW_STR-RESPONSIBLEPLANNERGROUPNAME sy-vline      INTO ld_text SEPARATED BY SPACE.

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