ABAP Select data from SAP table CUSD into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CUSD
*  INTO TABLE @DATA(IT_CUSD2).
*--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_CUSD INDEX 1 INTO DATA(WA_CUSD2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CUSD>-MANDT = 1.
<CUSD>-CLINT = 1.
<CUSD>-GRNAM = 1.
<CUSD>-SDSRT = 1.
<CUSD>-BNAME = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CUSD-ADZHL, sy-vline,
  WA_CUSD-DATUV, sy-vline,
  WA_CUSD-ERNAM, sy-vline,
  WA_CUSD-ERDAT, sy-vline,
  WA_CUSD-AENAM, sy-vline,
  WA_CUSD-AEDAT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CUSD 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_CUSD 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_CUSD INTO WA_CUSD.


*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_CUSD_STR, 
MANDT TYPE STRING,
CLINT TYPE STRING,
GRNAM TYPE STRING,
SDSRT TYPE STRING,
BNAME TYPE STRING,
ADZHL TYPE STRING,
DATUV TYPE STRING,
ERNAM TYPE STRING,
ERDAT TYPE STRING,
AENAM TYPE STRING,
AEDAT TYPE STRING,
SPVON TYPE STRING,
ZLVON TYPE STRING,
SPBIS TYPE STRING,
ZLBIS TYPE STRING,
KCOMP TYPE STRING,
PUSHB TYPE STRING,
TABST TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CUSD_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_CUSD_STR-MANDT sy-vline 
WA_CUSD_STR-CLINT sy-vline 
WA_CUSD_STR-GRNAM sy-vline 
WA_CUSD_STR-SDSRT sy-vline 
WA_CUSD_STR-BNAME sy-vline 
WA_CUSD_STR-ADZHL sy-vline 
WA_CUSD_STR-DATUV sy-vline 
WA_CUSD_STR-ERNAM sy-vline 
WA_CUSD_STR-ERDAT sy-vline 
WA_CUSD_STR-AENAM sy-vline 
WA_CUSD_STR-AEDAT sy-vline 
WA_CUSD_STR-SPVON sy-vline 
WA_CUSD_STR-ZLVON sy-vline 
WA_CUSD_STR-SPBIS sy-vline 
WA_CUSD_STR-ZLBIS sy-vline 
WA_CUSD_STR-KCOMP sy-vline 
WA_CUSD_STR-PUSHB sy-vline 
WA_CUSD_STR-TABST sy-vline      INTO ld_text SEPARATED BY SPACE.

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