ABAP Select data from SAP table WCACQ into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WCACQ
*  INTO TABLE @DATA(IT_WCACQ2).
*--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_WCACQ INDEX 1 INTO DATA(WA_WCACQ2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WCACQ>-MANDT = 1.
<WCACQ>-OBJNR = 1.
<WCACQ>-CNT = 1.
<WCACQ>-IWERK = 1.
<WCACQ>-WCNR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WCACQ-WCITM, sy-vline,
  WA_WCACQ-SEQ, sy-vline,
  WA_WCACQ-CCOBJ, sy-vline,
  WA_WCACQ-CCTYP, sy-vline,
  WA_WCACQ-TGGRP, sy-vline,
  WA_WCACQ-TGSTEP, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WCACQ 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_WCACQ 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_WCACQ INTO WA_WCACQ.


*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.

*Conversion exit ALPHA, internal->external for field WCNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_WCACQ-WCNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WCACQ-WCNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field TGNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_WCACQ-TGNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WCACQ-TGNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field UNNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_WCACQ-UNNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WCACQ-UNNR.
WRITE:/ 'New Value:', ld_input.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_WCACQ_STR, 
MANDT TYPE STRING,
OBJNR TYPE STRING,
CNT TYPE STRING,
IWERK TYPE STRING,
WCNR TYPE STRING,
WCITM TYPE STRING,
SEQ TYPE STRING,
CCOBJ TYPE STRING,
CCTYP TYPE STRING,
TGGRP TYPE STRING,
TGSTEP TYPE STRING,
TGPROC TYPE STRING,
TGTYP TYPE STRING,
UNSTEP TYPE STRING,
UNPROC TYPE STRING,
UNTYP TYPE STRING,
TGSTAT TYPE STRING,
PHBLFLG TYPE STRING,
PHBLTYP TYPE STRING,
PHBLNR TYPE STRING,
TGFLG TYPE STRING,
TGNR TYPE STRING,
TGFORM TYPE STRING,
UNNR TYPE STRING,
UNFORM TYPE STRING,
CRNAME TYPE STRING,
CRDATE TYPE STRING,
CRTIME TYPE STRING,
CHNAME TYPE STRING,
CHDATE TYPE STRING,
CHTIME TYPE STRING,
BNAME TYPE STRING,
BDATE TYPE STRING,
BTIME TYPE STRING,
ACTSTEP TYPE STRING,
ACTPROC TYPE STRING,
ACTTYP TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WCACQ_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_WCACQ_STR-MANDT sy-vline 
WA_WCACQ_STR-OBJNR sy-vline 
WA_WCACQ_STR-CNT sy-vline 
WA_WCACQ_STR-IWERK sy-vline 
WA_WCACQ_STR-WCNR sy-vline 
WA_WCACQ_STR-WCITM sy-vline 
WA_WCACQ_STR-SEQ sy-vline 
WA_WCACQ_STR-CCOBJ sy-vline 
WA_WCACQ_STR-CCTYP sy-vline 
WA_WCACQ_STR-TGGRP sy-vline 
WA_WCACQ_STR-TGSTEP sy-vline 
WA_WCACQ_STR-TGPROC sy-vline 
WA_WCACQ_STR-TGTYP sy-vline 
WA_WCACQ_STR-UNSTEP sy-vline 
WA_WCACQ_STR-UNPROC sy-vline 
WA_WCACQ_STR-UNTYP sy-vline 
WA_WCACQ_STR-TGSTAT sy-vline 
WA_WCACQ_STR-PHBLFLG sy-vline 
WA_WCACQ_STR-PHBLTYP sy-vline 
WA_WCACQ_STR-PHBLNR sy-vline 
WA_WCACQ_STR-TGFLG sy-vline 
WA_WCACQ_STR-TGNR sy-vline 
WA_WCACQ_STR-TGFORM sy-vline 
WA_WCACQ_STR-UNNR sy-vline 
WA_WCACQ_STR-UNFORM sy-vline 
WA_WCACQ_STR-CRNAME sy-vline 
WA_WCACQ_STR-CRDATE sy-vline 
WA_WCACQ_STR-CRTIME sy-vline 
WA_WCACQ_STR-CHNAME sy-vline 
WA_WCACQ_STR-CHDATE sy-vline 
WA_WCACQ_STR-CHTIME sy-vline 
WA_WCACQ_STR-BNAME sy-vline 
WA_WCACQ_STR-BDATE sy-vline 
WA_WCACQ_STR-BTIME sy-vline 
WA_WCACQ_STR-ACTSTEP sy-vline 
WA_WCACQ_STR-ACTPROC sy-vline 
WA_WCACQ_STR-ACTTYP sy-vline      INTO ld_text SEPARATED BY SPACE.

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