ABAP Select data from SAP table CLASSES_IN_WORKAREA into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CLASSES_IN_WORKAREA
*  INTO TABLE @DATA(IT_CLASSES_IN_WORKAREA2).
*--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_CLASSES_IN_WORKAREA INDEX 1 INTO DATA(WA_CLASSES_IN_WORKAREA2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CLASSES_IN_WORKAREA>-TSK_INAREA = 1.
<CLASSES_IN_WORKAREA>-MTK_INAREA = 1.
<CLASSES_IN_WORKAREA>-SEQ_INAREA = 1.
<CLASSES_IN_WORKAREA>-OPR_INAREA = 1.
<CLASSES_IN_WORKAREA>-SUO_INAREA = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CLASSES_IN_WORKAREA-COM_INAREA, sy-vline,
  WA_CLASSES_IN_WORKAREA-PRT_INAREA, sy-vline,
  WA_CLASSES_IN_WORKAREA-MST_INAREA, sy-vline,
  WA_CLASSES_IN_WORKAREA-CHA_INAREA, sy-vline,
  WA_CLASSES_IN_WORKAREA-CHV_INAREA, sy-vline,
  WA_CLASSES_IN_WORKAREA-OBM_INAREA, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CLASSES_IN_WORKAREA 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_CLASSES_IN_WORKAREA 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_CLASSES_IN_WORKAREA INTO WA_CLASSES_IN_WORKAREA.


*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_CLASSES_IN_WORKAREA_STR, 
TSK_INAREA TYPE STRING,
MTK_INAREA TYPE STRING,
SEQ_INAREA TYPE STRING,
OPR_INAREA TYPE STRING,
SUO_INAREA TYPE STRING,
COM_INAREA TYPE STRING,
PRT_INAREA TYPE STRING,
MST_INAREA TYPE STRING,
CHA_INAREA TYPE STRING,
CHV_INAREA TYPE STRING,
OBM_INAREA TYPE STRING,
BOM_INAREA TYPE STRING,
ITM_INAREA TYPE STRING,
SUI_INAREA TYPE STRING,
CLA_INAREA TYPE STRING,
ODP_INAREA TYPE STRING,
QSS_INAREA TYPE STRING,
AOB_INAREA TYPE STRING,
EQU_INAREA TYPE STRING,
TPL_INAREA TYPE STRING,
BOM_GROUP TYPE STRING,
TSK_GROUP TYPE STRING,
PAC_INAREA TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CLASSES_IN_WORKAREA_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_CLASSES_IN_WORKAREA_STR-TSK_INAREA sy-vline 
WA_CLASSES_IN_WORKAREA_STR-MTK_INAREA sy-vline 
WA_CLASSES_IN_WORKAREA_STR-SEQ_INAREA sy-vline 
WA_CLASSES_IN_WORKAREA_STR-OPR_INAREA sy-vline 
WA_CLASSES_IN_WORKAREA_STR-SUO_INAREA sy-vline 
WA_CLASSES_IN_WORKAREA_STR-COM_INAREA sy-vline 
WA_CLASSES_IN_WORKAREA_STR-PRT_INAREA sy-vline 
WA_CLASSES_IN_WORKAREA_STR-MST_INAREA sy-vline 
WA_CLASSES_IN_WORKAREA_STR-CHA_INAREA sy-vline 
WA_CLASSES_IN_WORKAREA_STR-CHV_INAREA sy-vline 
WA_CLASSES_IN_WORKAREA_STR-OBM_INAREA sy-vline 
WA_CLASSES_IN_WORKAREA_STR-BOM_INAREA sy-vline 
WA_CLASSES_IN_WORKAREA_STR-ITM_INAREA sy-vline 
WA_CLASSES_IN_WORKAREA_STR-SUI_INAREA sy-vline 
WA_CLASSES_IN_WORKAREA_STR-CLA_INAREA sy-vline 
WA_CLASSES_IN_WORKAREA_STR-ODP_INAREA sy-vline 
WA_CLASSES_IN_WORKAREA_STR-QSS_INAREA sy-vline 
WA_CLASSES_IN_WORKAREA_STR-AOB_INAREA sy-vline 
WA_CLASSES_IN_WORKAREA_STR-EQU_INAREA sy-vline 
WA_CLASSES_IN_WORKAREA_STR-TPL_INAREA sy-vline 
WA_CLASSES_IN_WORKAREA_STR-BOM_GROUP sy-vline 
WA_CLASSES_IN_WORKAREA_STR-TSK_GROUP sy-vline 
WA_CLASSES_IN_WORKAREA_STR-PAC_INAREA sy-vline      INTO ld_text SEPARATED BY SPACE.

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