ABAP Select data from SAP table TZD0A into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP TZD0A 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 TZD0A. 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 TZD0A 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_TZD0A TYPE STANDARD TABLE OF TZD0A,
      WA_TZD0A TYPE TZD0A,
      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: <TZD0A> TYPE TZD0A.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_TZD0A.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM TZD0A
  INTO TABLE IT_TZD0A.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TZD0A
*  INTO TABLE @DATA(IT_TZD0A2).
*--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_TZD0A INDEX 1 INTO DATA(WA_TZD0A2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_TZD0A ASSIGNING <TZD0A>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TZD0A>-MANDT = 1.
<TZD0A>-GSART = 1.
<TZD0A>-FISKN = 1.
<TZD0A>-KNRZA = 1.
<TZD0A>-LIFNR = 1.

ENDLOOP.

LOOP AT IT_TZD0A INTO WA_TZD0A.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TZD0A-BBBNR, sy-vline,
  WA_TZD0A-BBSNR, sy-vline,
  WA_TZD0A-BUBKZ, sy-vline,
  WA_TZD0A-BEGRU, sy-vline,
  WA_TZD0A-BRSCH, sy-vline,
  WA_TZD0A-KONZS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TZD0A 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_TZD0A 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_TZD0A INTO WA_TZD0A.


*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 FISKN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_TZD0A-FISKN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TZD0A-FISKN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KNRZA
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_TZD0A-KNRZA
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TZD0A-KNRZA.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field LIFNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_TZD0A-LIFNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TZD0A-LIFNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field VBUND
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_TZD0A-VBUND
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TZD0A-VBUND.
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_TZD0A_STR, 
MANDT TYPE STRING,
GSART TYPE STRING,
FISKN TYPE STRING,
KNRZA TYPE STRING,
LIFNR TYPE STRING,
BBBNR TYPE STRING,
BBSNR TYPE STRING,
BUBKZ TYPE STRING,
BEGRU TYPE STRING,
BRSCH TYPE STRING,
KONZS TYPE STRING,
COUNC TYPE STRING,
CITYC TYPE STRING,
STCD1 TYPE STRING,
STCD2 TYPE STRING,
STKZA TYPE STRING,
STKZU TYPE STRING,
XZEMP TYPE STRING,
VBUND TYPE STRING,
STCEG TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TZD0A_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_TZD0A_STR-MANDT sy-vline 
WA_TZD0A_STR-GSART sy-vline 
WA_TZD0A_STR-FISKN sy-vline 
WA_TZD0A_STR-KNRZA sy-vline 
WA_TZD0A_STR-LIFNR sy-vline 
WA_TZD0A_STR-BBBNR sy-vline 
WA_TZD0A_STR-BBSNR sy-vline 
WA_TZD0A_STR-BUBKZ sy-vline 
WA_TZD0A_STR-BEGRU sy-vline 
WA_TZD0A_STR-BRSCH sy-vline 
WA_TZD0A_STR-KONZS sy-vline 
WA_TZD0A_STR-COUNC sy-vline 
WA_TZD0A_STR-CITYC sy-vline 
WA_TZD0A_STR-STCD1 sy-vline 
WA_TZD0A_STR-STCD2 sy-vline 
WA_TZD0A_STR-STKZA sy-vline 
WA_TZD0A_STR-STKZU sy-vline 
WA_TZD0A_STR-XZEMP sy-vline 
WA_TZD0A_STR-VBUND sy-vline 
WA_TZD0A_STR-STCEG sy-vline      INTO ld_text SEPARATED BY SPACE.

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