ABAP Select data from SAP table HEADAOLD into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM HEADAOLD
*  INTO TABLE @DATA(IT_HEADAOLD2).
*--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_HEADAOLD INDEX 1 INTO DATA(WA_HEADAOLD2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<HEADAOLD>-RCSZK = 1.
<HEADAOLD>-RNAME = 1.
<HEADAOLD>-REPID = 1.
<HEADAOLD>-OBJECT = 1.
<HEADAOLD>-DBNAM = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_HEADAOLD-CLIENT, sy-vline,
  WA_HEADAOLD-DATUM, sy-vline,
  WA_HEADAOLD-UZEIT, sy-vline,
  WA_HEADAOLD-UNAME, sy-vline,
  WA_HEADAOLD-DSN, sy-vline,
  WA_HEADAOLD-HOST, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_HEADAOLD 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_HEADAOLD 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_HEADAOLD INTO WA_HEADAOLD.


*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_HEADAOLD_STR, 
RCSZK TYPE STRING,
RNAME TYPE STRING,
REPID TYPE STRING,
OBJECT TYPE STRING,
DBNAM TYPE STRING,
CLIENT TYPE STRING,
DATUM TYPE STRING,
UZEIT TYPE STRING,
UNAME TYPE STRING,
DSN TYPE STRING,
HOST TYPE STRING,
OPSYS TYPE STRING,
DBSYS TYPE STRING,
SYSID TYPE STRING,
SAPRL TYPE STRING,
APPLI TYPE STRING,
ARKEY TYPE STRING,END OF T_EKKO_STR.
DATA: WA_HEADAOLD_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_HEADAOLD_STR-RCSZK sy-vline 
WA_HEADAOLD_STR-RNAME sy-vline 
WA_HEADAOLD_STR-REPID sy-vline 
WA_HEADAOLD_STR-OBJECT sy-vline 
WA_HEADAOLD_STR-DBNAM sy-vline 
WA_HEADAOLD_STR-CLIENT sy-vline 
WA_HEADAOLD_STR-DATUM sy-vline 
WA_HEADAOLD_STR-UZEIT sy-vline 
WA_HEADAOLD_STR-UNAME sy-vline 
WA_HEADAOLD_STR-DSN sy-vline 
WA_HEADAOLD_STR-HOST sy-vline 
WA_HEADAOLD_STR-OPSYS sy-vline 
WA_HEADAOLD_STR-DBSYS sy-vline 
WA_HEADAOLD_STR-SYSID sy-vline 
WA_HEADAOLD_STR-SAPRL sy-vline 
WA_HEADAOLD_STR-APPLI sy-vline 
WA_HEADAOLD_STR-ARKEY sy-vline      INTO ld_text SEPARATED BY SPACE.

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