ABAP Select data from SAP table DTAZDEC into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DTAZDEC
*  INTO TABLE @DATA(IT_DTAZDEC2).
*--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_DTAZDEC INDEX 1 INTO DATA(WA_DTAZDEC2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DTAZDEC>-C2 = 1.
<DTAZDEC>-C3 = 1.
<DTAZDEC>-C4 = 1.
<DTAZDEC>-C5 = 1.
<DTAZDEC>-C6 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DTAZDEC-C7, sy-vline,
  WA_DTAZDEC-C8, sy-vline,
  WA_DTAZDEC-C9, sy-vline,
  WA_DTAZDEC-C10, sy-vline,
  WA_DTAZDEC-C11, sy-vline,
  WA_DTAZDEC-C12A, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DTAZDEC 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_DTAZDEC 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_DTAZDEC INTO WA_DTAZDEC.


*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_DTAZDEC_STR, 
C2 TYPE STRING,
C3 TYPE STRING,
C4 TYPE STRING,
C5 TYPE STRING,
C6 TYPE STRING,
C7 TYPE STRING,
C8 TYPE STRING,
C9 TYPE STRING,
C10 TYPE STRING,
C11 TYPE STRING,
C12A TYPE STRING,
C12B TYPE STRING,
C13 TYPE STRING,
C14 TYPE STRING,
C15 TYPE STRING,
C16 TYPE STRING,
C17 TYPE STRING,
C18 TYPE STRING,
C19 TYPE STRING,
C20 TYPE STRING,
C21 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DTAZDEC_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_DTAZDEC_STR-C2 sy-vline 
WA_DTAZDEC_STR-C3 sy-vline 
WA_DTAZDEC_STR-C4 sy-vline 
WA_DTAZDEC_STR-C5 sy-vline 
WA_DTAZDEC_STR-C6 sy-vline 
WA_DTAZDEC_STR-C7 sy-vline 
WA_DTAZDEC_STR-C8 sy-vline 
WA_DTAZDEC_STR-C9 sy-vline 
WA_DTAZDEC_STR-C10 sy-vline 
WA_DTAZDEC_STR-C11 sy-vline 
WA_DTAZDEC_STR-C12A sy-vline 
WA_DTAZDEC_STR-C12B sy-vline 
WA_DTAZDEC_STR-C13 sy-vline 
WA_DTAZDEC_STR-C14 sy-vline 
WA_DTAZDEC_STR-C15 sy-vline 
WA_DTAZDEC_STR-C16 sy-vline 
WA_DTAZDEC_STR-C17 sy-vline 
WA_DTAZDEC_STR-C18 sy-vline 
WA_DTAZDEC_STR-C19 sy-vline 
WA_DTAZDEC_STR-C20 sy-vline 
WA_DTAZDEC_STR-C21 sy-vline      INTO ld_text SEPARATED BY SPACE.

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