ABAP Select data from SAP table /PLMU/S_CLF_CLASSTYPE into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP /PLMU/S_CLF_CLASSTYPE 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 /PLMU/S_CLF_CLASSTYPE. 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 /PLMU/S_CLF_CLASSTYPE 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_/PLMU/S_CLF_CLASSTYPE TYPE STANDARD TABLE OF /PLMU/S_CLF_CLASSTYPE,
      WA_/PLMU/S_CLF_CLASSTYPE TYPE /PLMU/S_CLF_CLASSTYPE,
      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: </PLMU/S_CLF_CLASSTYPE> TYPE /PLMU/S_CLF_CLASSTYPE.

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

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM /PLMU/S_CLF_CLASSTYPE
  INTO TABLE IT_/PLMU/S_CLF_CLASSTYPE.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /PLMU/S_CLF_CLASSTYPE
*  INTO TABLE @DATA(IT_/PLMU/S_CLF_CLASSTYPE2).
*--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_/PLMU/S_CLF_CLASSTYPE INDEX 1 INTO DATA(WA_/PLMU/S_CLF_CLASSTYPE2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_/PLMU/S_CLF_CLASSTYPE ASSIGNING </PLMU/S_CLF_CLASSTYPE>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
</PLMU/S_CLF_CLASSTYPE>-CLASSTYPE = 1.
</PLMU/S_CLF_CLASSTYPE>-CLASSTYPE_TXT = 1.
</PLMU/S_CLF_CLASSTYPE>-CLF_STATUS_REL = 1.
</PLMU/S_CLF_CLASSTYPE>-CLF_STATUS_REL_TXT = 1.
</PLMU/S_CLF_CLASSTYPE>-CLF_STATUS_LOCK = 1.

ENDLOOP.

LOOP AT IT_/PLMU/S_CLF_CLASSTYPE INTO WA_/PLMU/S_CLF_CLASSTYPE.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/PLMU/S_CLF_CLASSTYPE-CLF_STATUS_LOCK_TXT, sy-vline,
  WA_/PLMU/S_CLF_CLASSTYPE-CLF_STATUS_INCO, sy-vline,
  WA_/PLMU/S_CLF_CLASSTYPE-CLF_STATUS_INCO_TXT, sy-vline,
  WA_/PLMU/S_CLF_CLASSTYPE-CLF_STATUS_SYS, sy-vline,
  WA_/PLMU/S_CLF_CLASSTYPE-CLF_STATUS_SYS_TXT, sy-vline,
  WA_/PLMU/S_CLF_CLASSTYPE-CLF_STATUS_AUTOREL, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/PLMU/S_CLF_CLASSTYPE 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_/PLMU/S_CLF_CLASSTYPE 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_/PLMU/S_CLF_CLASSTYPE INTO WA_/PLMU/S_CLF_CLASSTYPE.


*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_/PLMU/S_CLF_CLASSTYPE_STR, 
CLASSTYPE TYPE STRING,
CLASSTYPE_TXT TYPE STRING,
CLF_STATUS_REL TYPE STRING,
CLF_STATUS_REL_TXT TYPE STRING,
CLF_STATUS_LOCK TYPE STRING,
CLF_STATUS_LOCK_TXT TYPE STRING,
CLF_STATUS_INCO TYPE STRING,
CLF_STATUS_INCO_TXT TYPE STRING,
CLF_STATUS_SYS TYPE STRING,
CLF_STATUS_SYS_TXT TYPE STRING,
CLF_STATUS_AUTOREL TYPE STRING,
MFKLS TYPE STRING,
DOKFL TYPE STRING,
TXTFL TYPE STRING,
HIERARCHIE TYPE STRING,
CLF_EXISTS TYPE STRING,
CLASSTYPE_UI TYPE STRING,
CLF_STATUS_UI TYPE STRING,
CLF_STATUS_TXT_UI TYPE STRING,
CLF_STATUS_SEVERITY TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/PLMU/S_CLF_CLASSTYPE_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_/PLMU/S_CLF_CLASSTYPE_STR-CLASSTYPE sy-vline 
WA_/PLMU/S_CLF_CLASSTYPE_STR-CLASSTYPE_TXT sy-vline 
WA_/PLMU/S_CLF_CLASSTYPE_STR-CLF_STATUS_REL sy-vline 
WA_/PLMU/S_CLF_CLASSTYPE_STR-CLF_STATUS_REL_TXT sy-vline 
WA_/PLMU/S_CLF_CLASSTYPE_STR-CLF_STATUS_LOCK sy-vline 
WA_/PLMU/S_CLF_CLASSTYPE_STR-CLF_STATUS_LOCK_TXT sy-vline 
WA_/PLMU/S_CLF_CLASSTYPE_STR-CLF_STATUS_INCO sy-vline 
WA_/PLMU/S_CLF_CLASSTYPE_STR-CLF_STATUS_INCO_TXT sy-vline 
WA_/PLMU/S_CLF_CLASSTYPE_STR-CLF_STATUS_SYS sy-vline 
WA_/PLMU/S_CLF_CLASSTYPE_STR-CLF_STATUS_SYS_TXT sy-vline 
WA_/PLMU/S_CLF_CLASSTYPE_STR-CLF_STATUS_AUTOREL sy-vline 
WA_/PLMU/S_CLF_CLASSTYPE_STR-MFKLS sy-vline 
WA_/PLMU/S_CLF_CLASSTYPE_STR-DOKFL sy-vline 
WA_/PLMU/S_CLF_CLASSTYPE_STR-TXTFL sy-vline 
WA_/PLMU/S_CLF_CLASSTYPE_STR-HIERARCHIE sy-vline 
WA_/PLMU/S_CLF_CLASSTYPE_STR-CLF_EXISTS sy-vline 
WA_/PLMU/S_CLF_CLASSTYPE_STR-CLASSTYPE_UI sy-vline 
WA_/PLMU/S_CLF_CLASSTYPE_STR-CLF_STATUS_UI sy-vline 
WA_/PLMU/S_CLF_CLASSTYPE_STR-CLF_STATUS_TXT_UI sy-vline 
WA_/PLMU/S_CLF_CLASSTYPE_STR-CLF_STATUS_SEVERITY sy-vline      INTO ld_text SEPARATED BY SPACE.

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