ABAP Select data from SAP table CALLERGEN into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CALLERGEN
*  INTO TABLE @DATA(IT_CALLERGEN2).
*--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_CALLERGEN INDEX 1 INTO DATA(WA_CALLERGEN2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CALLERGEN>-MANDT = 1.
<CALLERGEN>-ALLERGENINTERNALID = 1.
<CALLERGEN>-ALLERGEN = 1.
<CALLERGEN>-ALLERGENPRIMARYIDFGDESC = 1.
<CALLERGEN>-ALLERGENSECONDARYIDFGDESC = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CALLERGEN-ALLERGENCREATEDBYUSER, sy-vline,
  WA_CALLERGEN-ALLERGENCREATEDBYUSERNAME, sy-vline,
  WA_CALLERGEN-ALLERGENCHANGEDBYUSER, sy-vline,
  WA_CALLERGEN-ALLERGENCHANGEDBYUSERNAME, sy-vline,
  WA_CALLERGEN-ALLERGENCREATIONDATE, sy-vline,
  WA_CALLERGEN-ALLERGENCHANGEDATE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CALLERGEN 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_CALLERGEN 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_CALLERGEN INTO WA_CALLERGEN.


*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 ALLERGENINTERNALID
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_CALLERGEN-ALLERGENINTERNALID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CALLERGEN-ALLERGENINTERNALID.
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_CALLERGEN_STR, 
MANDT TYPE STRING,
ALLERGENINTERNALID TYPE STRING,
ALLERGEN TYPE STRING,
ALLERGENPRIMARYIDFGDESC TYPE STRING,
ALLERGENSECONDARYIDFGDESC TYPE STRING,
ALLERGENCREATEDBYUSER TYPE STRING,
ALLERGENCREATEDBYUSERNAME TYPE STRING,
ALLERGENCHANGEDBYUSER TYPE STRING,
ALLERGENCHANGEDBYUSERNAME TYPE STRING,
ALLERGENCREATIONDATE TYPE STRING,
ALLERGENCHANGEDATE TYPE STRING,
ALLERGENHEADERSTATUS TYPE STRING,
ALLERGENHEADERSTATUSDESC TYPE STRING,
ALLERGENAUTHZNGROUP TYPE STRING,
SPECIFICATIONAUTHZNGROUPDESC TYPE STRING,
ALLERGENTYPE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CALLERGEN_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_CALLERGEN_STR-MANDT sy-vline 
WA_CALLERGEN_STR-ALLERGENINTERNALID sy-vline 
WA_CALLERGEN_STR-ALLERGEN sy-vline 
WA_CALLERGEN_STR-ALLERGENPRIMARYIDFGDESC sy-vline 
WA_CALLERGEN_STR-ALLERGENSECONDARYIDFGDESC sy-vline 
WA_CALLERGEN_STR-ALLERGENCREATEDBYUSER sy-vline 
WA_CALLERGEN_STR-ALLERGENCREATEDBYUSERNAME sy-vline 
WA_CALLERGEN_STR-ALLERGENCHANGEDBYUSER sy-vline 
WA_CALLERGEN_STR-ALLERGENCHANGEDBYUSERNAME sy-vline 
WA_CALLERGEN_STR-ALLERGENCREATIONDATE sy-vline 
WA_CALLERGEN_STR-ALLERGENCHANGEDATE sy-vline 
WA_CALLERGEN_STR-ALLERGENHEADERSTATUS sy-vline 
WA_CALLERGEN_STR-ALLERGENHEADERSTATUSDESC sy-vline 
WA_CALLERGEN_STR-ALLERGENAUTHZNGROUP sy-vline 
WA_CALLERGEN_STR-SPECIFICATIONAUTHZNGROUPDESC sy-vline 
WA_CALLERGEN_STR-ALLERGENTYPE sy-vline      INTO ld_text SEPARATED BY SPACE.

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