ABAP Select data from SAP table WCA2 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP WCA2 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 WCA2. 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 WCA2 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_WCA2 TYPE STANDARD TABLE OF WCA2,
      WA_WCA2 TYPE WCA2,
      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: <WCA2> TYPE WCA2.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_WCA2.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM WCA2
  INTO TABLE IT_WCA2.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WCA2
*  INTO TABLE @DATA(IT_WCA22).
*--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_WCA2 INDEX 1 INTO DATA(WA_WCA22).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_WCA2 ASSIGNING <WCA2>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WCA2>-MANDT = 1.
<WCA2>-OBJNR = 1.
<WCA2>-WK01 = 1.
<WCA2>-WK02 = 1.
<WCA2>-WK03 = 1.

ENDLOOP.

LOOP AT IT_WCA2 INTO WA_WCA2.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WCA2-WK04, sy-vline,
  WA_WCA2-WK05, sy-vline,
  WA_WCA2-WK06, sy-vline,
  WA_WCA2-WK07, sy-vline,
  WA_WCA2-WK08, sy-vline,
  WA_WCA2-WK09, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WCA2 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_WCA2 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_WCA2 INTO WA_WCA2.


*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_WCA2_STR, 
MANDT TYPE STRING,
OBJNR TYPE STRING,
WK01 TYPE STRING,
WK02 TYPE STRING,
WK03 TYPE STRING,
WK04 TYPE STRING,
WK05 TYPE STRING,
WK06 TYPE STRING,
WK07 TYPE STRING,
WK08 TYPE STRING,
WK09 TYPE STRING,
WK10 TYPE STRING,
WK11 TYPE STRING,
WK12 TYPE STRING,
WK13 TYPE STRING,
WK14 TYPE STRING,
WK15 TYPE STRING,
WK16 TYPE STRING,
WK17 TYPE STRING,
WK18 TYPE STRING,
WK19 TYPE STRING,
WK20 TYPE STRING,
WK21 TYPE STRING,
WK22 TYPE STRING,
WK23 TYPE STRING,
WK24 TYPE STRING,
WK25 TYPE STRING,
WK26 TYPE STRING,
WK27 TYPE STRING,
WK28 TYPE STRING,
NEED01 TYPE STRING,
NEED02 TYPE STRING,
NEED03 TYPE STRING,
NEED04 TYPE STRING,
NEED05 TYPE STRING,
NEED06 TYPE STRING,
NEED07 TYPE STRING,
NEED08 TYPE STRING,
NEED09 TYPE STRING,
NEED10 TYPE STRING,
NEED11 TYPE STRING,
NEED12 TYPE STRING,
NEED13 TYPE STRING,
NEED14 TYPE STRING,
NEED15 TYPE STRING,
NEED16 TYPE STRING,
NEED17 TYPE STRING,
NEED18 TYPE STRING,
NEED19 TYPE STRING,
NEED20 TYPE STRING,
NEED21 TYPE STRING,
NEED22 TYPE STRING,
NEED23 TYPE STRING,
NEED24 TYPE STRING,
NEED25 TYPE STRING,
NEED26 TYPE STRING,
NEED27 TYPE STRING,
NEED28 TYPE STRING,
CRNAME TYPE STRING,
CRDATE TYPE STRING,
CRTIME TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WCA2_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_WCA2_STR-MANDT sy-vline 
WA_WCA2_STR-OBJNR sy-vline 
WA_WCA2_STR-WK01 sy-vline 
WA_WCA2_STR-WK02 sy-vline 
WA_WCA2_STR-WK03 sy-vline 
WA_WCA2_STR-WK04 sy-vline 
WA_WCA2_STR-WK05 sy-vline 
WA_WCA2_STR-WK06 sy-vline 
WA_WCA2_STR-WK07 sy-vline 
WA_WCA2_STR-WK08 sy-vline 
WA_WCA2_STR-WK09 sy-vline 
WA_WCA2_STR-WK10 sy-vline 
WA_WCA2_STR-WK11 sy-vline 
WA_WCA2_STR-WK12 sy-vline 
WA_WCA2_STR-WK13 sy-vline 
WA_WCA2_STR-WK14 sy-vline 
WA_WCA2_STR-WK15 sy-vline 
WA_WCA2_STR-WK16 sy-vline 
WA_WCA2_STR-WK17 sy-vline 
WA_WCA2_STR-WK18 sy-vline 
WA_WCA2_STR-WK19 sy-vline 
WA_WCA2_STR-WK20 sy-vline 
WA_WCA2_STR-WK21 sy-vline 
WA_WCA2_STR-WK22 sy-vline 
WA_WCA2_STR-WK23 sy-vline 
WA_WCA2_STR-WK24 sy-vline 
WA_WCA2_STR-WK25 sy-vline 
WA_WCA2_STR-WK26 sy-vline 
WA_WCA2_STR-WK27 sy-vline 
WA_WCA2_STR-WK28 sy-vline 
WA_WCA2_STR-NEED01 sy-vline 
WA_WCA2_STR-NEED02 sy-vline 
WA_WCA2_STR-NEED03 sy-vline 
WA_WCA2_STR-NEED04 sy-vline 
WA_WCA2_STR-NEED05 sy-vline 
WA_WCA2_STR-NEED06 sy-vline 
WA_WCA2_STR-NEED07 sy-vline 
WA_WCA2_STR-NEED08 sy-vline 
WA_WCA2_STR-NEED09 sy-vline 
WA_WCA2_STR-NEED10 sy-vline 
WA_WCA2_STR-NEED11 sy-vline 
WA_WCA2_STR-NEED12 sy-vline 
WA_WCA2_STR-NEED13 sy-vline 
WA_WCA2_STR-NEED14 sy-vline 
WA_WCA2_STR-NEED15 sy-vline 
WA_WCA2_STR-NEED16 sy-vline 
WA_WCA2_STR-NEED17 sy-vline 
WA_WCA2_STR-NEED18 sy-vline 
WA_WCA2_STR-NEED19 sy-vline 
WA_WCA2_STR-NEED20 sy-vline 
WA_WCA2_STR-NEED21 sy-vline 
WA_WCA2_STR-NEED22 sy-vline 
WA_WCA2_STR-NEED23 sy-vline 
WA_WCA2_STR-NEED24 sy-vline 
WA_WCA2_STR-NEED25 sy-vline 
WA_WCA2_STR-NEED26 sy-vline 
WA_WCA2_STR-NEED27 sy-vline 
WA_WCA2_STR-NEED28 sy-vline 
WA_WCA2_STR-CRNAME sy-vline 
WA_WCA2_STR-CRDATE sy-vline 
WA_WCA2_STR-CRTIME sy-vline      INTO ld_text SEPARATED BY SPACE.

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