ABAP Select data from SAP table CMPWL into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CMPWL
*  INTO TABLE @DATA(IT_CMPWL2).
*--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_CMPWL INDEX 1 INTO DATA(WA_CMPWL2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CMPWL>-WLID = 1.
<CMPWL>-OBJECTNAME = 1.
<CMPWL>-OBJECTTYPE = 1.
<CMPWL>-TABNAME = 1.
<CMPWL>-VIEWNAME = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CMPWL-VIEWTYPE, sy-vline,
  WA_CMPWL-OBJCLIDEP, sy-vline,
  WA_CMPWL-OBJDEVCL, sy-vline,
  WA_CMPWL-OBJAPPCID, sy-vline,
  WA_CMPWL-ITEMCLIDEP, sy-vline,
  WA_CMPWL-ITEMAPPCID, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CMPWL 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_CMPWL 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_CMPWL INTO WA_CMPWL.


*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_CMPWL_STR, 
WLID TYPE STRING,
OBJECTNAME TYPE STRING,
OBJECTTYPE TYPE STRING,
TABNAME TYPE STRING,
VIEWNAME TYPE STRING,
VIEWTYPE TYPE STRING,
OBJCLIDEP TYPE STRING,
OBJDEVCL TYPE STRING,
OBJAPPCID TYPE STRING,
ITEMCLIDEP TYPE STRING,
ITEMAPPCID TYPE STRING,
ITEMTRANSL TYPE STRING,
ITEMDDIC TYPE STRING,
ITEMDELCL TYPE STRING,
ITEMDEVCL TYPE STRING,
IMPORTABLE TYPE STRING,
COMPARABLE TYPE STRING,
CMPLEVEL TYPE STRING,
IMPSTATUS TYPE STRING,
ADJSTATUS TYPE STRING,
CMPSTATUS TYPE STRING,
CMPDATE TYPE STRING,
CMPTIME TYPE STRING,
NBRALL_L TYPE STRING,
NBRONLY_L TYPE STRING,
NBRUPD TYPE STRING,
NBRUPDPRO TYPE STRING,
NBREQU TYPE STRING,
NBRREQU TYPE STRING,
NBRONLY_R TYPE STRING,
NBRALL_R TYPE STRING,
NBRADJUPD TYPE STRING,
NBRADJDEL TYPE STRING,
NBRADJINS TYPE STRING,
SEQUNO TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CMPWL_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_CMPWL_STR-WLID sy-vline 
WA_CMPWL_STR-OBJECTNAME sy-vline 
WA_CMPWL_STR-OBJECTTYPE sy-vline 
WA_CMPWL_STR-TABNAME sy-vline 
WA_CMPWL_STR-VIEWNAME sy-vline 
WA_CMPWL_STR-VIEWTYPE sy-vline 
WA_CMPWL_STR-OBJCLIDEP sy-vline 
WA_CMPWL_STR-OBJDEVCL sy-vline 
WA_CMPWL_STR-OBJAPPCID sy-vline 
WA_CMPWL_STR-ITEMCLIDEP sy-vline 
WA_CMPWL_STR-ITEMAPPCID sy-vline 
WA_CMPWL_STR-ITEMTRANSL sy-vline 
WA_CMPWL_STR-ITEMDDIC sy-vline 
WA_CMPWL_STR-ITEMDELCL sy-vline 
WA_CMPWL_STR-ITEMDEVCL sy-vline 
WA_CMPWL_STR-IMPORTABLE sy-vline 
WA_CMPWL_STR-COMPARABLE sy-vline 
WA_CMPWL_STR-CMPLEVEL sy-vline 
WA_CMPWL_STR-IMPSTATUS sy-vline 
WA_CMPWL_STR-ADJSTATUS sy-vline 
WA_CMPWL_STR-CMPSTATUS sy-vline 
WA_CMPWL_STR-CMPDATE sy-vline 
WA_CMPWL_STR-CMPTIME sy-vline 
WA_CMPWL_STR-NBRALL_L sy-vline 
WA_CMPWL_STR-NBRONLY_L sy-vline 
WA_CMPWL_STR-NBRUPD sy-vline 
WA_CMPWL_STR-NBRUPDPRO sy-vline 
WA_CMPWL_STR-NBREQU sy-vline 
WA_CMPWL_STR-NBRREQU sy-vline 
WA_CMPWL_STR-NBRONLY_R sy-vline 
WA_CMPWL_STR-NBRALL_R sy-vline 
WA_CMPWL_STR-NBRADJUPD sy-vline 
WA_CMPWL_STR-NBRADJDEL sy-vline 
WA_CMPWL_STR-NBRADJINS sy-vline 
WA_CMPWL_STR-SEQUNO sy-vline      INTO ld_text SEPARATED BY SPACE.

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