ABAP Select data from SAP table IDCNGA04 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP IDCNGA04 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 IDCNGA04. 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 IDCNGA04 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_IDCNGA04 TYPE STANDARD TABLE OF IDCNGA04,
      WA_IDCNGA04 TYPE IDCNGA04,
      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: <IDCNGA04> TYPE IDCNGA04.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_IDCNGA04.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM IDCNGA04
  INTO TABLE IT_IDCNGA04.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM IDCNGA04
*  INTO TABLE @DATA(IT_IDCNGA042).
*--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_IDCNGA04 INDEX 1 INTO DATA(WA_IDCNGA042).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_IDCNGA04 ASSIGNING <IDCNGA04>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<IDCNGA04>-IDCN035 = 1.
<IDCNGA04>-IDCN036 = 1.
<IDCNGA04>-IDCN037 = 1.
<IDCNGA04>-IDCN038 = 1.
<IDCNGA04>-IDCN039 = 1.

ENDLOOP.

LOOP AT IT_IDCNGA04 INTO WA_IDCNGA04.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_IDCNGA04-IDCN012, sy-vline,
  WA_IDCNGA04-IDCN040, sy-vline,
  WA_IDCNGA04-IDCN041, sy-vline,
  WA_IDCNGA04-IDCN020, sy-vline,
  WA_IDCNGA04-IDCN042, sy-vline,
  WA_IDCNGA04-IDCN043, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_IDCNGA04 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_IDCNGA04 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_IDCNGA04 INTO WA_IDCNGA04.


*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_IDCNGA04_STR, 
IDCN035 TYPE STRING,
IDCN036 TYPE STRING,
IDCN037 TYPE STRING,
IDCN038 TYPE STRING,
IDCN039 TYPE STRING,
IDCN012 TYPE STRING,
IDCN040 TYPE STRING,
IDCN041 TYPE STRING,
IDCN020 TYPE STRING,
IDCN042 TYPE STRING,
IDCN043 TYPE STRING,
IDCN044 TYPE STRING,
IDCN045 TYPE STRING,
IDCN046 TYPE STRING,
IDCN021 TYPE STRING,
IDCN047 TYPE STRING,
IDCN048 TYPE STRING,
IDCN049 TYPE STRING,
IDCN050 TYPE STRING,
IDCN051 TYPE STRING,
IDCN052 TYPE STRING,
IDCN053 TYPE STRING,
IDCN054 TYPE STRING,
IDCN055 TYPE STRING,
IDCN056 TYPE STRING,
IDCN057 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_IDCNGA04_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_IDCNGA04_STR-IDCN035 sy-vline 
WA_IDCNGA04_STR-IDCN036 sy-vline 
WA_IDCNGA04_STR-IDCN037 sy-vline 
WA_IDCNGA04_STR-IDCN038 sy-vline 
WA_IDCNGA04_STR-IDCN039 sy-vline 
WA_IDCNGA04_STR-IDCN012 sy-vline 
WA_IDCNGA04_STR-IDCN040 sy-vline 
WA_IDCNGA04_STR-IDCN041 sy-vline 
WA_IDCNGA04_STR-IDCN020 sy-vline 
WA_IDCNGA04_STR-IDCN042 sy-vline 
WA_IDCNGA04_STR-IDCN043 sy-vline 
WA_IDCNGA04_STR-IDCN044 sy-vline 
WA_IDCNGA04_STR-IDCN045 sy-vline 
WA_IDCNGA04_STR-IDCN046 sy-vline 
WA_IDCNGA04_STR-IDCN021 sy-vline 
WA_IDCNGA04_STR-IDCN047 sy-vline 
WA_IDCNGA04_STR-IDCN048 sy-vline 
WA_IDCNGA04_STR-IDCN049 sy-vline 
WA_IDCNGA04_STR-IDCN050 sy-vline 
WA_IDCNGA04_STR-IDCN051 sy-vline 
WA_IDCNGA04_STR-IDCN052 sy-vline 
WA_IDCNGA04_STR-IDCN053 sy-vline 
WA_IDCNGA04_STR-IDCN054 sy-vline 
WA_IDCNGA04_STR-IDCN055 sy-vline 
WA_IDCNGA04_STR-IDCN056 sy-vline 
WA_IDCNGA04_STR-IDCN057 sy-vline      INTO ld_text SEPARATED BY SPACE.

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