ABAP Select data from SAP table HUINV_GENERAL into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM HUINV_GENERAL
*  INTO TABLE @DATA(IT_HUINV_GENERAL2).
*--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_HUINV_GENERAL INDEX 1 INTO DATA(WA_HUINV_GENERAL2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<HUINV_GENERAL>-APPLICATION = 1.
<HUINV_GENERAL>-INVENTORY = 1.
<HUINV_GENERAL>-NR_INV_DOC = 1.
<HUINV_GENERAL>-NR_HU_IN_DOC = 1.
<HUINV_GENERAL>-STATUS_SET = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_HUINV_GENERAL-WERKS, sy-vline,
  WA_HUINV_GENERAL-LGORT, sy-vline,
  WA_HUINV_GENERAL-CURRENCY, sy-vline,
  WA_HUINV_GENERAL-SEL_DATE, sy-vline,
  WA_HUINV_GENERAL-ITEM_NR_HIGH, sy-vline,
  WA_HUINV_GENERAL-VEPOS_HIGH, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_HUINV_GENERAL 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_HUINV_GENERAL 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_HUINV_GENERAL INTO WA_HUINV_GENERAL.


*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 DISPLAY_ITEM
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_HUINV_GENERAL-DISPLAY_ITEM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_HUINV_GENERAL-DISPLAY_ITEM.
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_HUINV_GENERAL_STR, 
APPLICATION TYPE STRING,
INVENTORY TYPE STRING,
NR_INV_DOC TYPE STRING,
NR_HU_IN_DOC TYPE STRING,
STATUS_SET TYPE STRING,
WERKS TYPE STRING,
LGORT TYPE STRING,
CURRENCY TYPE STRING,
SEL_DATE TYPE STRING,
ITEM_NR_HIGH TYPE STRING,
VEPOS_HIGH TYPE STRING,
DISPLAY_ALL TYPE STRING,
DISPLAY_ITEM TYPE STRING,
BUDAT TYPE STRING,
BLDAT TYPE STRING,
NEW_ITEM TYPE STRING,END OF T_EKKO_STR.
DATA: WA_HUINV_GENERAL_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_HUINV_GENERAL_STR-APPLICATION sy-vline 
WA_HUINV_GENERAL_STR-INVENTORY sy-vline 
WA_HUINV_GENERAL_STR-NR_INV_DOC sy-vline 
WA_HUINV_GENERAL_STR-NR_HU_IN_DOC sy-vline 
WA_HUINV_GENERAL_STR-STATUS_SET sy-vline 
WA_HUINV_GENERAL_STR-WERKS sy-vline 
WA_HUINV_GENERAL_STR-LGORT sy-vline 
WA_HUINV_GENERAL_STR-CURRENCY sy-vline 
WA_HUINV_GENERAL_STR-SEL_DATE sy-vline 
WA_HUINV_GENERAL_STR-ITEM_NR_HIGH sy-vline 
WA_HUINV_GENERAL_STR-VEPOS_HIGH sy-vline 
WA_HUINV_GENERAL_STR-DISPLAY_ALL sy-vline 
WA_HUINV_GENERAL_STR-DISPLAY_ITEM sy-vline 
WA_HUINV_GENERAL_STR-BUDAT sy-vline 
WA_HUINV_GENERAL_STR-BLDAT sy-vline 
WA_HUINV_GENERAL_STR-NEW_ITEM sy-vline      INTO ld_text SEPARATED BY SPACE.

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