ABAP Select data from SAP table /DSD/HH_E1CTAD12 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP /DSD/HH_E1CTAD12 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 /DSD/HH_E1CTAD12. 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 /DSD/HH_E1CTAD12 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_/DSD/HH_E1CTAD12 TYPE STANDARD TABLE OF /DSD/HH_E1CTAD12,
      WA_/DSD/HH_E1CTAD12 TYPE /DSD/HH_E1CTAD12,
      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: </DSD/HH_E1CTAD12> TYPE /DSD/HH_E1CTAD12.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_/DSD/HH_E1CTAD12.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM /DSD/HH_E1CTAD12
  INTO TABLE IT_/DSD/HH_E1CTAD12.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /DSD/HH_E1CTAD12
*  INTO TABLE @DATA(IT_/DSD/HH_E1CTAD122).
*--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_/DSD/HH_E1CTAD12 INDEX 1 INTO DATA(WA_/DSD/HH_E1CTAD122).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_/DSD/HH_E1CTAD12 ASSIGNING </DSD/HH_E1CTAD12>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
</DSD/HH_E1CTAD12>-DOC_NR = 1.
</DSD/HH_E1CTAD12>-KAPPL = 1.
</DSD/HH_E1CTAD12>-FAHRNR1 = 1.
</DSD/HH_E1CTAD12>-FAHRNR2 = 1.
</DSD/HH_E1CTAD12>-FZGNR1 = 1.

ENDLOOP.

LOOP AT IT_/DSD/HH_E1CTAD12 INTO WA_/DSD/HH_E1CTAD12.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/DSD/HH_E1CTAD12-FZGNR2, sy-vline,
  WA_/DSD/HH_E1CTAD12-TOUR_TYP, sy-vline,
  WA_/DSD/HH_E1CTAD12-ROUTE, sy-vline,
  WA_/DSD/HH_E1CTAD12-SDATE, sy-vline,
  WA_/DSD/HH_E1CTAD12-STIME, sy-vline,
  WA_/DSD/HH_E1CTAD12-SZONE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/DSD/HH_E1CTAD12 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_/DSD/HH_E1CTAD12 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_/DSD/HH_E1CTAD12 INTO WA_/DSD/HH_E1CTAD12.


*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_/DSD/HH_E1CTAD12_STR, 
DOC_NR TYPE STRING,
KAPPL TYPE STRING,
FAHRNR1 TYPE STRING,
FAHRNR2 TYPE STRING,
FZGNR1 TYPE STRING,
FZGNR2 TYPE STRING,
TOUR_TYP TYPE STRING,
ROUTE TYPE STRING,
SDATE TYPE STRING,
STIME TYPE STRING,
SZONE TYPE STRING,
EDATE TYPE STRING,
ETIME TYPE STRING,
DISTZ TYPE STRING,
MEDST TYPE STRING,
CARRIER TYPE STRING,
ROUTEBEZ TYPE STRING,
DRIVER1_NAME TYPE STRING,
EXTI1 TYPE STRING,
SUPPLIER_GLN TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/DSD/HH_E1CTAD12_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_/DSD/HH_E1CTAD12_STR-DOC_NR sy-vline 
WA_/DSD/HH_E1CTAD12_STR-KAPPL sy-vline 
WA_/DSD/HH_E1CTAD12_STR-FAHRNR1 sy-vline 
WA_/DSD/HH_E1CTAD12_STR-FAHRNR2 sy-vline 
WA_/DSD/HH_E1CTAD12_STR-FZGNR1 sy-vline 
WA_/DSD/HH_E1CTAD12_STR-FZGNR2 sy-vline 
WA_/DSD/HH_E1CTAD12_STR-TOUR_TYP sy-vline 
WA_/DSD/HH_E1CTAD12_STR-ROUTE sy-vline 
WA_/DSD/HH_E1CTAD12_STR-SDATE sy-vline 
WA_/DSD/HH_E1CTAD12_STR-STIME sy-vline 
WA_/DSD/HH_E1CTAD12_STR-SZONE sy-vline 
WA_/DSD/HH_E1CTAD12_STR-EDATE sy-vline 
WA_/DSD/HH_E1CTAD12_STR-ETIME sy-vline 
WA_/DSD/HH_E1CTAD12_STR-DISTZ sy-vline 
WA_/DSD/HH_E1CTAD12_STR-MEDST sy-vline 
WA_/DSD/HH_E1CTAD12_STR-CARRIER sy-vline 
WA_/DSD/HH_E1CTAD12_STR-ROUTEBEZ sy-vline 
WA_/DSD/HH_E1CTAD12_STR-DRIVER1_NAME sy-vline 
WA_/DSD/HH_E1CTAD12_STR-EXTI1 sy-vline 
WA_/DSD/HH_E1CTAD12_STR-SUPPLIER_GLN sy-vline      INTO ld_text SEPARATED BY SPACE.

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