ABAP Select data from SAP table CDNAMES into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CDNAMES
*  INTO TABLE @DATA(IT_CDNAMES2).
*--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_CDNAMES INDEX 1 INTO DATA(WA_CDNAMES2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CDNAMES>-OBJECT = 1.
<CDNAMES>-REPORTNAME = 1.
<CDNAMES>-FUNCNAME = 1.
<CDNAMES>-REPNAMEC = 1.
<CDNAMES>-REPNAMET = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CDNAMES-REPNAMEFIX, sy-vline,
  WA_CDNAMES-REPNAMEVAR, sy-vline,
  WA_CDNAMES-NAMESPACE, sy-vline,
  WA_CDNAMES-INCLUDE, sy-vline,
  WA_CDNAMES-FGRP, sy-vline,
  WA_CDNAMES-DEVCLASS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CDNAMES 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_CDNAMES 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_CDNAMES INTO WA_CDNAMES.


*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 OBJECT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_CDNAMES-OBJECT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CDNAMES-OBJECT.
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_CDNAMES_STR, 
OBJECT TYPE STRING,
REPORTNAME TYPE STRING,
FUNCNAME TYPE STRING,
REPNAMEC TYPE STRING,
REPNAMET TYPE STRING,
REPNAMEFIX TYPE STRING,
REPNAMEVAR TYPE STRING,
NAMESPACE TYPE STRING,
INCLUDE TYPE STRING,
FGRP TYPE STRING,
DEVCLASS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CDNAMES_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_CDNAMES_STR-OBJECT sy-vline 
WA_CDNAMES_STR-REPORTNAME sy-vline 
WA_CDNAMES_STR-FUNCNAME sy-vline 
WA_CDNAMES_STR-REPNAMEC sy-vline 
WA_CDNAMES_STR-REPNAMET sy-vline 
WA_CDNAMES_STR-REPNAMEFIX sy-vline 
WA_CDNAMES_STR-REPNAMEVAR sy-vline 
WA_CDNAMES_STR-NAMESPACE sy-vline 
WA_CDNAMES_STR-INCLUDE sy-vline 
WA_CDNAMES_STR-FGRP sy-vline 
WA_CDNAMES_STR-DEVCLASS sy-vline      INTO ld_text SEPARATED BY SPACE.

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