ABAP Select data from SAP table OIA08H into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP OIA08H 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 OIA08H. 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 OIA08H 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_OIA08H TYPE STANDARD TABLE OF OIA08H,
      WA_OIA08H TYPE OIA08H,
      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: <OIA08H> TYPE OIA08H.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_OIA08H.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM OIA08H
  INTO TABLE IT_OIA08H.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM OIA08H
*  INTO TABLE @DATA(IT_OIA08H2).
*--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_OIA08H INDEX 1 INTO DATA(WA_OIA08H2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_OIA08H ASSIGNING <OIA08H>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<OIA08H>-MANDT = 1.
<OIA08H>-UPENUM = 1.
<OIA08H>-MJAHR = 1.
<OIA08H>-BLDAT = 1.
<OIA08H>-BUDAT = 1.

ENDLOOP.

LOOP AT IT_OIA08H INTO WA_OIA08H.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_OIA08H-UPEDOC, sy-vline,
  WA_OIA08H-ERDAT, sy-vline,
  WA_OIA08H-ERTIM, sy-vline,
  WA_OIA08H-ERNAM, sy-vline,
  WA_OIA08H-AEDAT, sy-vline,
  WA_OIA08H-AETIM, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_OIA08H 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_OIA08H 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_OIA08H INTO WA_OIA08H.


*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 UPENUM
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_OIA08H-UPENUM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_OIA08H-UPENUM.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GJAHR, internal->external for field MJAHR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_OIA08H-MJAHR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_OIA08H-MJAHR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field PMTHIN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_OIA08H-PMTHIN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_OIA08H-PMTHIN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field EXGPTR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_OIA08H-EXGPTR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_OIA08H-EXGPTR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field REV_LIANUM
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_OIA08H-REV_LIANUM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_OIA08H-REV_LIANUM.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GJAHR, internal->external for field REV_MJAHR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_OIA08H-REV_MJAHR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_OIA08H-REV_MJAHR.
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_OIA08H_STR, 
MANDT TYPE STRING,
UPENUM TYPE STRING,
MJAHR TYPE STRING,
BLDAT TYPE STRING,
BUDAT TYPE STRING,
UPEDOC TYPE STRING,
ERDAT TYPE STRING,
ERTIM TYPE STRING,
ERNAM TYPE STRING,
AEDAT TYPE STRING,
AETIM TYPE STRING,
AENAM TYPE STRING,
PMTHIN TYPE STRING,
EXGPTR TYPE STRING,
REV_LIANUM TYPE STRING,
REV_MJAHR TYPE STRING,
_DATAAGING TYPE STRING,END OF T_EKKO_STR.
DATA: WA_OIA08H_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_OIA08H_STR-MANDT sy-vline 
WA_OIA08H_STR-UPENUM sy-vline 
WA_OIA08H_STR-MJAHR sy-vline 
WA_OIA08H_STR-BLDAT sy-vline 
WA_OIA08H_STR-BUDAT sy-vline 
WA_OIA08H_STR-UPEDOC sy-vline 
WA_OIA08H_STR-ERDAT sy-vline 
WA_OIA08H_STR-ERTIM sy-vline 
WA_OIA08H_STR-ERNAM sy-vline 
WA_OIA08H_STR-AEDAT sy-vline 
WA_OIA08H_STR-AETIM sy-vline 
WA_OIA08H_STR-AENAM sy-vline 
WA_OIA08H_STR-PMTHIN sy-vline 
WA_OIA08H_STR-EXGPTR sy-vline 
WA_OIA08H_STR-REV_LIANUM sy-vline 
WA_OIA08H_STR-REV_MJAHR sy-vline 
WA_OIA08H_STR-_DATAAGING sy-vline      INTO ld_text SEPARATED BY SPACE.

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