ABAP Select data from SAP table CDRED into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CDRED
*  INTO TABLE @DATA(IT_CDRED2).
*--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_CDRED INDEX 1 INTO DATA(WA_CDRED2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CDRED>-OBJECTID = 1.
<CDRED>-CHANGENR = 1.
<CDRED>-USERNAME = 1.
<CDRED>-UDATE = 1.
<CDRED>-UTIME = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CDRED-TCODE, sy-vline,
  WA_CDRED-TABNAME, sy-vline,
  WA_CDRED-TABKEY, sy-vline,
  WA_CDRED-KEYLEN, sy-vline,
  WA_CDRED-CHNGIND, sy-vline,
  WA_CDRED-FNAME, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CDRED 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_CDRED 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_CDRED INTO WA_CDRED.


*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 CHANGENR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_CDRED-CHANGENR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CDRED-CHANGENR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ISOLA, internal->external for field SPRACHE
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_CDRED-SPRACHE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CDRED-SPRACHE.
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_CDRED_STR, 
OBJECTID TYPE STRING,
CHANGENR TYPE STRING,
USERNAME TYPE STRING,
UDATE TYPE STRING,
UTIME TYPE STRING,
TCODE TYPE STRING,
TABNAME TYPE STRING,
TABKEY TYPE STRING,
KEYLEN TYPE STRING,
CHNGIND TYPE STRING,
FNAME TYPE STRING,
FTEXT TYPE STRING,
TEXTART TYPE STRING,
SPRACHE TYPE STRING,
TEXT_CASE TYPE STRING,
OUTLEN TYPE STRING,
F_OLD TYPE STRING,
F_NEW TYPE STRING,
KEYGUID TYPE STRING,
TABKEY254 TYPE STRING,
EXT_KEYLEN TYPE STRING,
KEYGUID_STR TYPE STRING,
VERSION TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CDRED_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_CDRED_STR-OBJECTID sy-vline 
WA_CDRED_STR-CHANGENR sy-vline 
WA_CDRED_STR-USERNAME sy-vline 
WA_CDRED_STR-UDATE sy-vline 
WA_CDRED_STR-UTIME sy-vline 
WA_CDRED_STR-TCODE sy-vline 
WA_CDRED_STR-TABNAME sy-vline 
WA_CDRED_STR-TABKEY sy-vline 
WA_CDRED_STR-KEYLEN sy-vline 
WA_CDRED_STR-CHNGIND sy-vline 
WA_CDRED_STR-FNAME sy-vline 
WA_CDRED_STR-FTEXT sy-vline 
WA_CDRED_STR-TEXTART sy-vline 
WA_CDRED_STR-SPRACHE sy-vline 
WA_CDRED_STR-TEXT_CASE sy-vline 
WA_CDRED_STR-OUTLEN sy-vline 
WA_CDRED_STR-F_OLD sy-vline 
WA_CDRED_STR-F_NEW sy-vline 
WA_CDRED_STR-KEYGUID sy-vline 
WA_CDRED_STR-TABKEY254 sy-vline 
WA_CDRED_STR-EXT_KEYLEN sy-vline 
WA_CDRED_STR-KEYGUID_STR sy-vline 
WA_CDRED_STR-VERSION sy-vline      INTO ld_text SEPARATED BY SPACE.

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