ABAP Select data from SAP table WCSALV41 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP WCSALV41 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 WCSALV41. 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 WCSALV41 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_WCSALV41 TYPE STANDARD TABLE OF WCSALV41,
      WA_WCSALV41 TYPE WCSALV41,
      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: <WCSALV41> TYPE WCSALV41.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_WCSALV41.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM WCSALV41
  INTO TABLE IT_WCSALV41.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WCSALV41
*  INTO TABLE @DATA(IT_WCSALV412).
*--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_WCSALV41 INDEX 1 INTO DATA(WA_WCSALV412).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_WCSALV41 ASSIGNING <WCSALV41>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WCSALV41>-OBJNR = 1.
<WCSALV41>-TEXT = 1.
<WCSALV41>-STEP = 1.
<WCSALV41>-STEPX = 1.
<WCSALV41>-SEQ = 1.

ENDLOOP.

LOOP AT IT_WCSALV41 INTO WA_WCSALV41.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WCSALV41-SYSST, sy-vline,
  WA_WCSALV41-USRST, sy-vline,
  WA_WCSALV41-CRNAME, sy-vline,
  WA_WCSALV41-CRDATE, sy-vline,
  WA_WCSALV41-CRTIME, sy-vline,
  WA_WCSALV41-CHNAME, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WCSALV41 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_WCSALV41 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_WCSALV41 INTO WA_WCSALV41.


*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_WCSALV41_STR, 
OBJNR TYPE STRING,
TEXT TYPE STRING,
STEP TYPE STRING,
STEPX TYPE STRING,
SEQ TYPE STRING,
SYSST TYPE STRING,
USRST TYPE STRING,
CRNAME TYPE STRING,
CRDATE TYPE STRING,
CRTIME TYPE STRING,
CHNAME TYPE STRING,
CHDATE TYPE STRING,
CHTIME TYPE STRING,
STATICON TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WCSALV41_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_WCSALV41_STR-OBJNR sy-vline 
WA_WCSALV41_STR-TEXT sy-vline 
WA_WCSALV41_STR-STEP sy-vline 
WA_WCSALV41_STR-STEPX sy-vline 
WA_WCSALV41_STR-SEQ sy-vline 
WA_WCSALV41_STR-SYSST sy-vline 
WA_WCSALV41_STR-USRST sy-vline 
WA_WCSALV41_STR-CRNAME sy-vline 
WA_WCSALV41_STR-CRDATE sy-vline 
WA_WCSALV41_STR-CRTIME sy-vline 
WA_WCSALV41_STR-CHNAME sy-vline 
WA_WCSALV41_STR-CHDATE sy-vline 
WA_WCSALV41_STR-CHTIME sy-vline 
WA_WCSALV41_STR-STATICON sy-vline      INTO ld_text SEPARATED BY SPACE.

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