ABAP Select data from SAP table NMAINTTASKLIST 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 NMAINTTASKLIST 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 NMAINTTASKLIST. 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 NMAINTTASKLIST 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_NMAINTTASKLIST TYPE STANDARD TABLE OF NMAINTTASKLIST,
      WA_NMAINTTASKLIST TYPE NMAINTTASKLIST,
      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: <NMAINTTASKLIST> TYPE NMAINTTASKLIST.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM NMAINTTASKLIST
*  INTO TABLE @DATA(IT_NMAINTTASKLIST2).
*--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_NMAINTTASKLIST INDEX 1 INTO DATA(WA_NMAINTTASKLIST2).


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

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

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_NMAINTTASKLIST-TASKLISTDESC, sy-vline,
  WA_NMAINTTASKLIST-MAINTENANCESTRATEGY, sy-vline,
  WA_NMAINTTASKLIST-PLANT, sy-vline,
  WA_NMAINTTASKLIST-RESPONSIBLEPLANNERGROUP, sy-vline,
  WA_NMAINTTASKLIST-ISDELETED, sy-vline,
  WA_NMAINTTASKLIST-ASSEMBLY, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_NMAINTTASKLIST 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_NMAINTTASKLIST 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_NMAINTTASKLIST INTO WA_NMAINTTASKLIST.


*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_NMAINTTASKLIST-TASKLISTGROUP
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_NMAINTTASKLIST-TASKLISTGROUP.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field TASKLISTGROUPCOUNTER
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_NMAINTTASKLIST-TASKLISTGROUPCOUNTER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_NMAINTTASKLIST-TASKLISTGROUPCOUNTER.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field ASSEMBLY
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_NMAINTTASKLIST-ASSEMBLY
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_NMAINTTASKLIST-ASSEMBLY.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field EQUIPMENT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_NMAINTTASKLIST-EQUIPMENT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_NMAINTTASKLIST-EQUIPMENT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit TPLNR, internal->external for field FUNCTIONALLOCATION
CALL FUNCTION 'CONVERSION_EXIT_TPLNR_OUTPUT'
  EXPORTING
    input =                      WA_NMAINTTASKLIST-FUNCTIONALLOCATION
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_NMAINTTASKLIST-FUNCTIONALLOCATION.
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_NMAINTTASKLIST_STR, 
MANDT TYPE STRING,
TASKLISTTYPE TYPE STRING,
TASKLISTGROUP TYPE STRING,
TASKLISTGROUPCOUNTER TYPE STRING,
TASKLISTVERSIONCOUNTER TYPE STRING,
TASKLISTDESC TYPE STRING,
MAINTENANCESTRATEGY TYPE STRING,
PLANT TYPE STRING,
RESPONSIBLEPLANNERGROUP TYPE STRING,
ISDELETED TYPE STRING,
ASSEMBLY TYPE STRING,
TASKLISTSTATUS TYPE STRING,
VALIDITYSTARTDATE TYPE STRING,
VALIDITYENDDATE TYPE STRING,
OPERATIONSYSTEMCONDITION TYPE STRING,
WORKCENTERTYPECODE TYPE STRING,
WORKCENTERINTERNALID TYPE STRING,
TASKLISTUSAGE TYPE STRING,
TECHOBJISEQUIPORFUNCNLLOC TYPE STRING,
CONTROLLINGAREA TYPE STRING,
EQUIPMENT TYPE STRING,
FUNCTIONALLOCATION TYPE STRING,
FUNCNLLOCPRIMARYLABELNAME TYPE STRING,
MAINTENANCEPLANNINGPLANT TYPE STRING,
PLAINLONGTEXT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_NMAINTTASKLIST_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_NMAINTTASKLIST_STR-MANDT sy-vline 
WA_NMAINTTASKLIST_STR-TASKLISTTYPE sy-vline 
WA_NMAINTTASKLIST_STR-TASKLISTGROUP sy-vline 
WA_NMAINTTASKLIST_STR-TASKLISTGROUPCOUNTER sy-vline 
WA_NMAINTTASKLIST_STR-TASKLISTVERSIONCOUNTER sy-vline 
WA_NMAINTTASKLIST_STR-TASKLISTDESC sy-vline 
WA_NMAINTTASKLIST_STR-MAINTENANCESTRATEGY sy-vline 
WA_NMAINTTASKLIST_STR-PLANT sy-vline 
WA_NMAINTTASKLIST_STR-RESPONSIBLEPLANNERGROUP sy-vline 
WA_NMAINTTASKLIST_STR-ISDELETED sy-vline 
WA_NMAINTTASKLIST_STR-ASSEMBLY sy-vline 
WA_NMAINTTASKLIST_STR-TASKLISTSTATUS sy-vline 
WA_NMAINTTASKLIST_STR-VALIDITYSTARTDATE sy-vline 
WA_NMAINTTASKLIST_STR-VALIDITYENDDATE sy-vline 
WA_NMAINTTASKLIST_STR-OPERATIONSYSTEMCONDITION sy-vline 
WA_NMAINTTASKLIST_STR-WORKCENTERTYPECODE sy-vline 
WA_NMAINTTASKLIST_STR-WORKCENTERINTERNALID sy-vline 
WA_NMAINTTASKLIST_STR-TASKLISTUSAGE sy-vline 
WA_NMAINTTASKLIST_STR-TECHOBJISEQUIPORFUNCNLLOC sy-vline 
WA_NMAINTTASKLIST_STR-CONTROLLINGAREA sy-vline 
WA_NMAINTTASKLIST_STR-EQUIPMENT sy-vline 
WA_NMAINTTASKLIST_STR-FUNCTIONALLOCATION sy-vline 
WA_NMAINTTASKLIST_STR-FUNCNLLOCPRIMARYLABELNAME sy-vline 
WA_NMAINTTASKLIST_STR-MAINTENANCEPLANNINGPLANT sy-vline 
WA_NMAINTTASKLIST_STR-PLAINLONGTEXT sy-vline      INTO ld_text SEPARATED BY SPACE.

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