ABAP Select data from SAP table INV_ARCH_DISPLAY_DOC into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM INV_ARCH_DISPLAY_DOC
*  INTO TABLE @DATA(IT_INV_ARCH_DISPLAY_DOC2).
*--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_INV_ARCH_DISPLAY_DOC INDEX 1 INTO DATA(WA_INV_ARCH_DISPLAY_DOC2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<INV_ARCH_DISPLAY_DOC>-INT_INV_NO = 1.
<INV_ARCH_DISPLAY_DOC>-EXT_SENDER = 1.
<INV_ARCH_DISPLAY_DOC>-EXT_RECEIVER = 1.
<INV_ARCH_DISPLAY_DOC>-INVOICE_TYPE = 1.
<INV_ARCH_DISPLAY_DOC>-INBOUND_TYPE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_INV_ARCH_DISPLAY_DOC-INVOICE_DATE, sy-vline,
  WA_INV_ARCH_DISPLAY_DOC-INVOICE_STATUS, sy-vline,
  WA_INV_ARCH_DISPLAY_DOC-CREATED_BY, sy-vline,
  WA_INV_ARCH_DISPLAY_DOC-CREATE_DATE, sy-vline,
  WA_INV_ARCH_DISPLAY_DOC-NUM_DOCS, sy-vline,
  WA_INV_ARCH_DISPLAY_DOC-NUM_LINE_B, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_INV_ARCH_DISPLAY_DOC 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_INV_ARCH_DISPLAY_DOC 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_INV_ARCH_DISPLAY_DOC INTO WA_INV_ARCH_DISPLAY_DOC.


*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_INV_ARCH_DISPLAY_DOC_STR, 
INT_INV_NO TYPE STRING,
EXT_SENDER TYPE STRING,
EXT_RECEIVER TYPE STRING,
INVOICE_TYPE TYPE STRING,
INBOUND_TYPE TYPE STRING,
INVOICE_DATE TYPE STRING,
INVOICE_STATUS TYPE STRING,
CREATED_BY TYPE STRING,
CREATE_DATE TYPE STRING,
NUM_DOCS TYPE STRING,
NUM_LINE_B TYPE STRING,
NUM_LINE_I TYPE STRING,
NUM_LINE_A TYPE STRING,
NUM_DOCPROC TYPE STRING,
NUM_DOCREF TYPE STRING,
NUM_DOCREL TYPE STRING,
NUM_EXTID TYPE STRING,
NUM_LOGHD TYPE STRING,
NUM_LOGLINE TYPE STRING,
NUM_LOGPARM TYPE STRING,
NUM_PRCSUPP TYPE STRING,
NUM_STS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_INV_ARCH_DISPLAY_DOC_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_INV_ARCH_DISPLAY_DOC_STR-INT_INV_NO sy-vline 
WA_INV_ARCH_DISPLAY_DOC_STR-EXT_SENDER sy-vline 
WA_INV_ARCH_DISPLAY_DOC_STR-EXT_RECEIVER sy-vline 
WA_INV_ARCH_DISPLAY_DOC_STR-INVOICE_TYPE sy-vline 
WA_INV_ARCH_DISPLAY_DOC_STR-INBOUND_TYPE sy-vline 
WA_INV_ARCH_DISPLAY_DOC_STR-INVOICE_DATE sy-vline 
WA_INV_ARCH_DISPLAY_DOC_STR-INVOICE_STATUS sy-vline 
WA_INV_ARCH_DISPLAY_DOC_STR-CREATED_BY sy-vline 
WA_INV_ARCH_DISPLAY_DOC_STR-CREATE_DATE sy-vline 
WA_INV_ARCH_DISPLAY_DOC_STR-NUM_DOCS sy-vline 
WA_INV_ARCH_DISPLAY_DOC_STR-NUM_LINE_B sy-vline 
WA_INV_ARCH_DISPLAY_DOC_STR-NUM_LINE_I sy-vline 
WA_INV_ARCH_DISPLAY_DOC_STR-NUM_LINE_A sy-vline 
WA_INV_ARCH_DISPLAY_DOC_STR-NUM_DOCPROC sy-vline 
WA_INV_ARCH_DISPLAY_DOC_STR-NUM_DOCREF sy-vline 
WA_INV_ARCH_DISPLAY_DOC_STR-NUM_DOCREL sy-vline 
WA_INV_ARCH_DISPLAY_DOC_STR-NUM_EXTID sy-vline 
WA_INV_ARCH_DISPLAY_DOC_STR-NUM_LOGHD sy-vline 
WA_INV_ARCH_DISPLAY_DOC_STR-NUM_LOGLINE sy-vline 
WA_INV_ARCH_DISPLAY_DOC_STR-NUM_LOGPARM sy-vline 
WA_INV_ARCH_DISPLAY_DOC_STR-NUM_PRCSUPP sy-vline 
WA_INV_ARCH_DISPLAY_DOC_STR-NUM_STS sy-vline      INTO ld_text SEPARATED BY SPACE.

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