ABAP Select data from SAP table DOC_HDR_ALV into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DOC_HDR_ALV
*  INTO TABLE @DATA(IT_DOC_HDR_ALV2).
*--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_DOC_HDR_ALV INDEX 1 INTO DATA(WA_DOC_HDR_ALV2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DOC_HDR_ALV>-SELKEY = 1.
<DOC_HDR_ALV>-MANDT = 1.
<DOC_HDR_ALV>-BUKRS = 1.
<DOC_HDR_ALV>-BELNR = 1.
<DOC_HDR_ALV>-GJAHR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DOC_HDR_ALV-BKTXT, sy-vline,
  WA_DOC_HDR_ALV-BLART, sy-vline,
  WA_DOC_HDR_ALV-BLDAT, sy-vline,
  WA_DOC_HDR_ALV-BUDAT, sy-vline,
  WA_DOC_HDR_ALV-XBLNR, sy-vline,
  WA_DOC_HDR_ALV-WAERS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DOC_HDR_ALV 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_DOC_HDR_ALV 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_DOC_HDR_ALV INTO WA_DOC_HDR_ALV.


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

*Conversion exit GJAHR, internal->external for field GJAHR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_DOC_HDR_ALV-GJAHR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DOC_HDR_ALV-GJAHR.
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_DOC_HDR_ALV_STR, 
SELKEY TYPE STRING,
MANDT TYPE STRING,
BUKRS TYPE STRING,
BELNR TYPE STRING,
GJAHR TYPE STRING,
BKTXT TYPE STRING,
BLART TYPE STRING,
BLDAT TYPE STRING,
BUDAT TYPE STRING,
XBLNR TYPE STRING,
WAERS TYPE STRING,
HWAER TYPE STRING,
HWAE2 TYPE STRING,
HWAE3 TYPE STRING,
CURT2 TYPE STRING,
CURT3 TYPE STRING,
TXT100 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DOC_HDR_ALV_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_DOC_HDR_ALV_STR-SELKEY sy-vline 
WA_DOC_HDR_ALV_STR-MANDT sy-vline 
WA_DOC_HDR_ALV_STR-BUKRS sy-vline 
WA_DOC_HDR_ALV_STR-BELNR sy-vline 
WA_DOC_HDR_ALV_STR-GJAHR sy-vline 
WA_DOC_HDR_ALV_STR-BKTXT sy-vline 
WA_DOC_HDR_ALV_STR-BLART sy-vline 
WA_DOC_HDR_ALV_STR-BLDAT sy-vline 
WA_DOC_HDR_ALV_STR-BUDAT sy-vline 
WA_DOC_HDR_ALV_STR-XBLNR sy-vline 
WA_DOC_HDR_ALV_STR-WAERS sy-vline 
WA_DOC_HDR_ALV_STR-HWAER sy-vline 
WA_DOC_HDR_ALV_STR-HWAE2 sy-vline 
WA_DOC_HDR_ALV_STR-HWAE3 sy-vline 
WA_DOC_HDR_ALV_STR-CURT2 sy-vline 
WA_DOC_HDR_ALV_STR-CURT3 sy-vline 
WA_DOC_HDR_ALV_STR-TXT100 sy-vline      INTO ld_text SEPARATED BY SPACE.

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