ABAP Select data from SAP table M_OIHLG into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM M_OIHLG
*  INTO TABLE @DATA(IT_M_OIHLG2).
*--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_M_OIHLG INDEX 1 INTO DATA(WA_M_OIHLG2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<M_OIHLG>-MANDT = 1.
<M_OIHLG>-LICTP = 1.
<M_OIHLG>-REFLT = 1.
<M_OIHLG>-LICIN = 1.
<M_OIHLG>-CERTF1 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_M_OIHLG-BUKRS, sy-vline,
  WA_M_OIHLG-LCMOT, sy-vline,
  WA_M_OIHLG-REGIO, sy-vline,
  WA_M_OIHLG-LAND1, sy-vline,
  WA_M_OIHLG-COUNC, sy-vline,
  WA_M_OIHLG-CITYC, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_M_OIHLG 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_M_OIHLG 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_M_OIHLG INTO WA_M_OIHLG.


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

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

*Conversion exit MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_M_OIHLG-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_M_OIHLG-MATNR.
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_M_OIHLG_STR, 
MANDT TYPE STRING,
LICTP TYPE STRING,
REFLT TYPE STRING,
LICIN TYPE STRING,
CERTF1 TYPE STRING,
BUKRS TYPE STRING,
LCMOT TYPE STRING,
REGIO TYPE STRING,
LAND1 TYPE STRING,
COUNC TYPE STRING,
CITYC TYPE STRING,
ALTLC TYPE STRING,
KUNNR TYPE STRING,
KVGR1 TYPE STRING,
MATNR TYPE STRING,
MVGR2 TYPE STRING,
DATAB TYPE STRING,
DATBI TYPE STRING,
NAME1 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_M_OIHLG_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_M_OIHLG_STR-MANDT sy-vline 
WA_M_OIHLG_STR-LICTP sy-vline 
WA_M_OIHLG_STR-REFLT sy-vline 
WA_M_OIHLG_STR-LICIN sy-vline 
WA_M_OIHLG_STR-CERTF1 sy-vline 
WA_M_OIHLG_STR-BUKRS sy-vline 
WA_M_OIHLG_STR-LCMOT sy-vline 
WA_M_OIHLG_STR-REGIO sy-vline 
WA_M_OIHLG_STR-LAND1 sy-vline 
WA_M_OIHLG_STR-COUNC sy-vline 
WA_M_OIHLG_STR-CITYC sy-vline 
WA_M_OIHLG_STR-ALTLC sy-vline 
WA_M_OIHLG_STR-KUNNR sy-vline 
WA_M_OIHLG_STR-KVGR1 sy-vline 
WA_M_OIHLG_STR-MATNR sy-vline 
WA_M_OIHLG_STR-MVGR2 sy-vline 
WA_M_OIHLG_STR-DATAB sy-vline 
WA_M_OIHLG_STR-DATBI sy-vline 
WA_M_OIHLG_STR-NAME1 sy-vline      INTO ld_text SEPARATED BY SPACE.

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