ABAP Select data from SAP table OIH_IMSEG into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM OIH_IMSEG
*  INTO TABLE @DATA(IT_OIH_IMSEG2).
*--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_OIH_IMSEG INDEX 1 INTO DATA(WA_OIH_IMSEG2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<OIH_IMSEG>-OITAXGRP = 1.
<OIH_IMSEG>-OIHANTYP = 1.
<OIH_IMSEG>-OITAXFROM = 1.
<OIH_IMSEG>-OITAXTO = 1.
<OIH_IMSEG>-OIPRICIE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_OIH_IMSEG-OIFULTAX, sy-vline,
  WA_OIH_IMSEG-OITXVAL0, sy-vline,
  WA_OIH_IMSEG-OITXVAL1, sy-vline,
  WA_OIH_IMSEG-OITXVAL2, sy-vline,
  WA_OIH_IMSEG-OITXVAL3, sy-vline,
  WA_OIH_IMSEG-OITXVAL4, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_OIH_IMSEG 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_OIH_IMSEG 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_OIH_IMSEG INTO WA_OIH_IMSEG.


*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 CUNIT, internal->external for field OIUOMQT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_OIH_IMSEG-OIUOMQT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_OIH_IMSEG-OIUOMQT.
WRITE:/ 'New Value:', ld_input.

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

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

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

*Conversion exit ALPHA, internal->external for field OIH_LCFOL_GI
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_OIH_IMSEG-OIH_LCFOL_GI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_OIH_IMSEG-OIH_LCFOL_GI.
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_OIH_IMSEG_STR, 
OITAXGRP TYPE STRING,
OIHANTYP TYPE STRING,
OITAXFROM TYPE STRING,
OITAXTO TYPE STRING,
OIPRICIE TYPE STRING,
OIFULTAX TYPE STRING,
OITXVAL0 TYPE STRING,
OITXVAL1 TYPE STRING,
OITXVAL2 TYPE STRING,
OITXVAL3 TYPE STRING,
OITXVAL4 TYPE STRING,
OITXVAL5 TYPE STRING,
OITXVAL6 TYPE STRING,
OIOILCON TYPE STRING,
OITAXCON TYPE STRING,
OITAXVAL TYPE STRING,
OIOILCON2 TYPE STRING,
OIUOMQT TYPE STRING,
OITAXQT TYPE STRING,
OIFUTQT TYPE STRING,
OIFUTTX TYPE STRING,
OIFUTDT TYPE STRING,
OIFUTQT2 TYPE STRING,
OIFUTTX2 TYPE STRING,
OIFUTDT2 TYPE STRING,
OIEDOK TYPE STRING,
OIEDBAL TYPE STRING,
OIEDBALM TYPE STRING,
OICERTF1 TYPE STRING,
OIDATFM1 TYPE STRING,
OIDATTO1 TYPE STRING,
OIH_LICTP TYPE STRING,
OIH_LICIN TYPE STRING,
OIH_LCFOL TYPE STRING,
OIH_FOLQTY TYPE STRING,
OIEDOK_GI TYPE STRING,
OIEDBAL_GI TYPE STRING,
OIEDBALM_GI TYPE STRING,
OICERTF1_GI TYPE STRING,
OIDATFM1_GI TYPE STRING,
OIDATTO1_GI TYPE STRING,
OIH_LICTP_GI TYPE STRING,
OIH_LICIN_GI TYPE STRING,
OIH_LCFOL_GI TYPE STRING,
OIH_FOLQTY_GI TYPE STRING,
OIHANTYP_GI TYPE STRING,
OITAXGRP_GI TYPE STRING,
OIINEX_GI TYPE STRING,
OITAXFROM_GI TYPE STRING,
OITAXTO_GI TYPE STRING,END OF T_EKKO_STR.
DATA: WA_OIH_IMSEG_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_OIH_IMSEG_STR-OITAXGRP sy-vline 
WA_OIH_IMSEG_STR-OIHANTYP sy-vline 
WA_OIH_IMSEG_STR-OITAXFROM sy-vline 
WA_OIH_IMSEG_STR-OITAXTO sy-vline 
WA_OIH_IMSEG_STR-OIPRICIE sy-vline 
WA_OIH_IMSEG_STR-OIFULTAX sy-vline 
WA_OIH_IMSEG_STR-OITXVAL0 sy-vline 
WA_OIH_IMSEG_STR-OITXVAL1 sy-vline 
WA_OIH_IMSEG_STR-OITXVAL2 sy-vline 
WA_OIH_IMSEG_STR-OITXVAL3 sy-vline 
WA_OIH_IMSEG_STR-OITXVAL4 sy-vline 
WA_OIH_IMSEG_STR-OITXVAL5 sy-vline 
WA_OIH_IMSEG_STR-OITXVAL6 sy-vline 
WA_OIH_IMSEG_STR-OIOILCON sy-vline 
WA_OIH_IMSEG_STR-OITAXCON sy-vline 
WA_OIH_IMSEG_STR-OITAXVAL sy-vline 
WA_OIH_IMSEG_STR-OIOILCON2 sy-vline 
WA_OIH_IMSEG_STR-OIUOMQT sy-vline 
WA_OIH_IMSEG_STR-OITAXQT sy-vline 
WA_OIH_IMSEG_STR-OIFUTQT sy-vline 
WA_OIH_IMSEG_STR-OIFUTTX sy-vline 
WA_OIH_IMSEG_STR-OIFUTDT sy-vline 
WA_OIH_IMSEG_STR-OIFUTQT2 sy-vline 
WA_OIH_IMSEG_STR-OIFUTTX2 sy-vline 
WA_OIH_IMSEG_STR-OIFUTDT2 sy-vline 
WA_OIH_IMSEG_STR-OIEDOK sy-vline 
WA_OIH_IMSEG_STR-OIEDBAL sy-vline 
WA_OIH_IMSEG_STR-OIEDBALM sy-vline 
WA_OIH_IMSEG_STR-OICERTF1 sy-vline 
WA_OIH_IMSEG_STR-OIDATFM1 sy-vline 
WA_OIH_IMSEG_STR-OIDATTO1 sy-vline 
WA_OIH_IMSEG_STR-OIH_LICTP sy-vline 
WA_OIH_IMSEG_STR-OIH_LICIN sy-vline 
WA_OIH_IMSEG_STR-OIH_LCFOL sy-vline 
WA_OIH_IMSEG_STR-OIH_FOLQTY sy-vline 
WA_OIH_IMSEG_STR-OIEDOK_GI sy-vline 
WA_OIH_IMSEG_STR-OIEDBAL_GI sy-vline 
WA_OIH_IMSEG_STR-OIEDBALM_GI sy-vline 
WA_OIH_IMSEG_STR-OICERTF1_GI sy-vline 
WA_OIH_IMSEG_STR-OIDATFM1_GI sy-vline 
WA_OIH_IMSEG_STR-OIDATTO1_GI sy-vline 
WA_OIH_IMSEG_STR-OIH_LICTP_GI sy-vline 
WA_OIH_IMSEG_STR-OIH_LICIN_GI sy-vline 
WA_OIH_IMSEG_STR-OIH_LCFOL_GI sy-vline 
WA_OIH_IMSEG_STR-OIH_FOLQTY_GI sy-vline 
WA_OIH_IMSEG_STR-OIHANTYP_GI sy-vline 
WA_OIH_IMSEG_STR-OITAXGRP_GI sy-vline 
WA_OIH_IMSEG_STR-OIINEX_GI sy-vline 
WA_OIH_IMSEG_STR-OITAXFROM_GI sy-vline 
WA_OIH_IMSEG_STR-OITAXTO_GI sy-vline      INTO ld_text SEPARATED BY SPACE.

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