ABAP Select data from SAP table IKZCUSTDECL into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM IKZCUSTDECL
*  INTO TABLE @DATA(IT_IKZCUSTDECL2).
*--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_IKZCUSTDECL INDEX 1 INTO DATA(WA_IKZCUSTDECL2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<IKZCUSTDECL>-MANDT = 1.
<IKZCUSTDECL>-COMPANYCODE = 1.
<IKZCUSTDECL>-CUSTOMSDECLARATION = 1.
<IKZCUSTDECL>-FISCALYEAR = 1.
<IKZCUSTDECL>-POSTINGFISCALPERIOD = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_IKZCUSTDECL-CUSTOMSDECLARATIONTYPE, sy-vline,
  WA_IKZCUSTDECL-MONTHINFIRSTINTERVAL, sy-vline,
  WA_IKZCUSTDECL-CUSTOMSDECLARATIONREGDATE, sy-vline,
  WA_IKZCUSTDECL-TAXAMOUNT, sy-vline,
  WA_IKZCUSTDECL-PAYMENTDATE, sy-vline,
  WA_IKZCUSTDECL-PAIDAMOUNTINPAYTCURRENCY, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_IKZCUSTDECL 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_IKZCUSTDECL 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_IKZCUSTDECL INTO WA_IKZCUSTDECL.


*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 GJAHR, internal->external for field FISCALYEAR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_IKZCUSTDECL-FISCALYEAR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_IKZCUSTDECL-FISCALYEAR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AC152, internal->external for field TAXAMOUNT
CALL FUNCTION 'CONVERSION_EXIT_AC152_OUTPUT'
  EXPORTING
    input =                      WA_IKZCUSTDECL-TAXAMOUNT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_IKZCUSTDECL-TAXAMOUNT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AC152, internal->external for field PAIDAMOUNTINPAYTCURRENCY
CALL FUNCTION 'CONVERSION_EXIT_AC152_OUTPUT'
  EXPORTING
    input =                      WA_IKZCUSTDECL-PAIDAMOUNTINPAYTCURRENCY
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_IKZCUSTDECL-PAIDAMOUNTINPAYTCURRENCY.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AC152, internal->external for field CARETURNAMOUNTINTRANSCURRENCY
CALL FUNCTION 'CONVERSION_EXIT_AC152_OUTPUT'
  EXPORTING
    input =                      WA_IKZCUSTDECL-CARETURNAMOUNTINTRANSCURRENCY
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_IKZCUSTDECL-CARETURNAMOUNTINTRANSCURRENCY.
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_IKZCUSTDECL_STR, 
MANDT TYPE STRING,
COMPANYCODE TYPE STRING,
CUSTOMSDECLARATION TYPE STRING,
FISCALYEAR TYPE STRING,
POSTINGFISCALPERIOD TYPE STRING,
CUSTOMSDECLARATIONTYPE TYPE STRING,
MONTHINFIRSTINTERVAL TYPE STRING,
CUSTOMSDECLARATIONREGDATE TYPE STRING,
TAXAMOUNT TYPE STRING,
PAYMENTDATE TYPE STRING,
PAIDAMOUNTINPAYTCURRENCY TYPE STRING,
CARETURNAMOUNTINTRANSCURRENCY TYPE STRING,
COUNTRYCODE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_IKZCUSTDECL_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_IKZCUSTDECL_STR-MANDT sy-vline 
WA_IKZCUSTDECL_STR-COMPANYCODE sy-vline 
WA_IKZCUSTDECL_STR-CUSTOMSDECLARATION sy-vline 
WA_IKZCUSTDECL_STR-FISCALYEAR sy-vline 
WA_IKZCUSTDECL_STR-POSTINGFISCALPERIOD sy-vline 
WA_IKZCUSTDECL_STR-CUSTOMSDECLARATIONTYPE sy-vline 
WA_IKZCUSTDECL_STR-MONTHINFIRSTINTERVAL sy-vline 
WA_IKZCUSTDECL_STR-CUSTOMSDECLARATIONREGDATE sy-vline 
WA_IKZCUSTDECL_STR-TAXAMOUNT sy-vline 
WA_IKZCUSTDECL_STR-PAYMENTDATE sy-vline 
WA_IKZCUSTDECL_STR-PAIDAMOUNTINPAYTCURRENCY sy-vline 
WA_IKZCUSTDECL_STR-CARETURNAMOUNTINTRANSCURRENCY sy-vline 
WA_IKZCUSTDECL_STR-COUNTRYCODE sy-vline      INTO ld_text SEPARATED BY SPACE.

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