ABAP Select data from SAP table OIH_MEPO_TAX into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP OIH_MEPO_TAX 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_MEPO_TAX. 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_MEPO_TAX 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_MEPO_TAX TYPE STANDARD TABLE OF OIH_MEPO_TAX,
      WA_OIH_MEPO_TAX TYPE OIH_MEPO_TAX,
      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_MEPO_TAX> TYPE OIH_MEPO_TAX.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM OIH_MEPO_TAX
*  INTO TABLE @DATA(IT_OIH_MEPO_TAX2).
*--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_MEPO_TAX INDEX 1 INTO DATA(WA_OIH_MEPO_TAX2).


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

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

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_OIH_MEPO_TAX-BWTAR, sy-vline,
  WA_OIH_MEPO_TAX-OIOILCON, sy-vline,
  WA_OIH_MEPO_TAX-OIPRICIE, sy-vline,
  WA_OIH_MEPO_TAX-OITAXGRP_TEXT, sy-vline,
  WA_OIH_MEPO_TAX-OIHANTYP_TEXT, sy-vline,
  WA_OIH_MEPO_TAX-OIINEX_TEXT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_OIH_MEPO_TAX 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_MEPO_TAX 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_MEPO_TAX INTO WA_OIH_MEPO_TAX.


*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 OIH_LICIN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_OIH_MEPO_TAX-OIH_LICIN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_OIH_MEPO_TAX-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_MEPO_TAX-OIH_LCFOL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_OIH_MEPO_TAX-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_MEPO_TAX-OIH_LICIN_GI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_OIH_MEPO_TAX-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_MEPO_TAX-OIH_LCFOL_GI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_OIH_MEPO_TAX-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_MEPO_TAX_STR, 
OITAXGRP TYPE STRING,
OIHANTYP TYPE STRING,
OITAXFROM TYPE STRING,
OITAXTO TYPE STRING,
OIINEX TYPE STRING,
BWTAR TYPE STRING,
OIOILCON TYPE STRING,
OIPRICIE TYPE STRING,
OITAXGRP_TEXT TYPE STRING,
OIHANTYP_TEXT TYPE STRING,
OIINEX_TEXT TYPE STRING,
OITAXFROM_TEXT TYPE STRING,
OITAXTO_TEXT 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,
OIHANTYPGI_TEXT TYPE STRING,
OITAXGRPGI_TEXT TYPE STRING,
OIINEX_GI_TEXT TYPE STRING,
OIUMBAR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_OIH_MEPO_TAX_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_MEPO_TAX_STR-OITAXGRP sy-vline 
WA_OIH_MEPO_TAX_STR-OIHANTYP sy-vline 
WA_OIH_MEPO_TAX_STR-OITAXFROM sy-vline 
WA_OIH_MEPO_TAX_STR-OITAXTO sy-vline 
WA_OIH_MEPO_TAX_STR-OIINEX sy-vline 
WA_OIH_MEPO_TAX_STR-BWTAR sy-vline 
WA_OIH_MEPO_TAX_STR-OIOILCON sy-vline 
WA_OIH_MEPO_TAX_STR-OIPRICIE sy-vline 
WA_OIH_MEPO_TAX_STR-OITAXGRP_TEXT sy-vline 
WA_OIH_MEPO_TAX_STR-OIHANTYP_TEXT sy-vline 
WA_OIH_MEPO_TAX_STR-OIINEX_TEXT sy-vline 
WA_OIH_MEPO_TAX_STR-OITAXFROM_TEXT sy-vline 
WA_OIH_MEPO_TAX_STR-OITAXTO_TEXT sy-vline 
WA_OIH_MEPO_TAX_STR-OIEDOK sy-vline 
WA_OIH_MEPO_TAX_STR-OIEDBAL sy-vline 
WA_OIH_MEPO_TAX_STR-OIEDBALM sy-vline 
WA_OIH_MEPO_TAX_STR-OICERTF1 sy-vline 
WA_OIH_MEPO_TAX_STR-OIDATFM1 sy-vline 
WA_OIH_MEPO_TAX_STR-OIDATTO1 sy-vline 
WA_OIH_MEPO_TAX_STR-OIH_LICTP sy-vline 
WA_OIH_MEPO_TAX_STR-OIH_LICIN sy-vline 
WA_OIH_MEPO_TAX_STR-OIH_LCFOL sy-vline 
WA_OIH_MEPO_TAX_STR-OIH_FOLQTY sy-vline 
WA_OIH_MEPO_TAX_STR-OIEDOK_GI sy-vline 
WA_OIH_MEPO_TAX_STR-OIEDBAL_GI sy-vline 
WA_OIH_MEPO_TAX_STR-OIEDBALM_GI sy-vline 
WA_OIH_MEPO_TAX_STR-OICERTF1_GI sy-vline 
WA_OIH_MEPO_TAX_STR-OIDATFM1_GI sy-vline 
WA_OIH_MEPO_TAX_STR-OIDATTO1_GI sy-vline 
WA_OIH_MEPO_TAX_STR-OIH_LICTP_GI sy-vline 
WA_OIH_MEPO_TAX_STR-OIH_LICIN_GI sy-vline 
WA_OIH_MEPO_TAX_STR-OIH_LCFOL_GI sy-vline 
WA_OIH_MEPO_TAX_STR-OIH_FOLQTY_GI sy-vline 
WA_OIH_MEPO_TAX_STR-OIHANTYP_GI sy-vline 
WA_OIH_MEPO_TAX_STR-OITAXGRP_GI sy-vline 
WA_OIH_MEPO_TAX_STR-OIINEX_GI sy-vline 
WA_OIH_MEPO_TAX_STR-OITAXFROM_GI sy-vline 
WA_OIH_MEPO_TAX_STR-OITAXTO_GI sy-vline 
WA_OIH_MEPO_TAX_STR-OIHANTYPGI_TEXT sy-vline 
WA_OIH_MEPO_TAX_STR-OITAXGRPGI_TEXT sy-vline 
WA_OIH_MEPO_TAX_STR-OIINEX_GI_TEXT sy-vline 
WA_OIH_MEPO_TAX_STR-OIUMBAR sy-vline      INTO ld_text SEPARATED BY SPACE.

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