ABAP Select data from SAP table OIH01A into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP OIH01A 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 OIH01A. 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 OIH01A 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_OIH01A TYPE STANDARD TABLE OF OIH01A,
      WA_OIH01A TYPE OIH01A,
      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: <OIH01A> TYPE OIH01A.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_OIH01A.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM OIH01A
  INTO TABLE IT_OIH01A.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM OIH01A
*  INTO TABLE @DATA(IT_OIH01A2).
*--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_OIH01A INDEX 1 INTO DATA(WA_OIH01A2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_OIH01A ASSIGNING <OIH01A>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<OIH01A>-MANDT = 1.
<OIH01A>-BUKRS = 1.
<OIH01A>-OIH_LAND1 = 1.
<OIH01A>-OIH_REGIO = 1.
<OIH01A>-OIH_COUNC = 1.

ENDLOOP.

LOOP AT IT_OIH01A INTO WA_OIH01A.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_OIH01A-OIH_CITYC, sy-vline,
  WA_OIH01A-TAXGRP, sy-vline,
  WA_OIH01A-HANTYP, sy-vline,
  WA_OIH01A-DATUV, sy-vline,
  WA_OIH01A-TAXRT, sy-vline,
  WA_OIH01A-EDBASE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_OIH01A 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_OIH01A 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_OIH01A INTO WA_OIH01A.


*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 INVDT, internal->external for field DATUV
CALL FUNCTION 'CONVERSION_EXIT_INVDT_OUTPUT'
  EXPORTING
    input =                      WA_OIH01A-DATUV
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_OIH01A-DATUV.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field QTYUT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_OIH01A-QTYUT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_OIH01A-QTYUT.
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_OIH01A_STR, 
MANDT TYPE STRING,
BUKRS TYPE STRING,
OIH_LAND1 TYPE STRING,
OIH_REGIO TYPE STRING,
OIH_COUNC TYPE STRING,
OIH_CITYC TYPE STRING,
TAXGRP TYPE STRING,
HANTYP TYPE STRING,
DATUV TYPE STRING,
TAXRT TYPE STRING,
EDBASE TYPE STRING,
QTYUT TYPE STRING,
TAXRT1 TYPE STRING,
TAXRT2 TYPE STRING,
TAXRT3 TYPE STRING,
TAXRT4 TYPE STRING,
TAXRT5 TYPE STRING,
TAXRT6 TYPE STRING,
WAERS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_OIH01A_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_OIH01A_STR-MANDT sy-vline 
WA_OIH01A_STR-BUKRS sy-vline 
WA_OIH01A_STR-OIH_LAND1 sy-vline 
WA_OIH01A_STR-OIH_REGIO sy-vline 
WA_OIH01A_STR-OIH_COUNC sy-vline 
WA_OIH01A_STR-OIH_CITYC sy-vline 
WA_OIH01A_STR-TAXGRP sy-vline 
WA_OIH01A_STR-HANTYP sy-vline 
WA_OIH01A_STR-DATUV sy-vline 
WA_OIH01A_STR-TAXRT sy-vline 
WA_OIH01A_STR-EDBASE sy-vline 
WA_OIH01A_STR-QTYUT sy-vline 
WA_OIH01A_STR-TAXRT1 sy-vline 
WA_OIH01A_STR-TAXRT2 sy-vline 
WA_OIH01A_STR-TAXRT3 sy-vline 
WA_OIH01A_STR-TAXRT4 sy-vline 
WA_OIH01A_STR-TAXRT5 sy-vline 
WA_OIH01A_STR-TAXRT6 sy-vline 
WA_OIH01A_STR-WAERS sy-vline      INTO ld_text SEPARATED BY SPACE.

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