ABAP Select data from SAP table OII_MSEG_LINE into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM OII_MSEG_LINE
*  INTO TABLE @DATA(IT_OII_MSEG_LINE2).
*--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_OII_MSEG_LINE INDEX 1 INTO DATA(WA_OII_MSEG_LINE2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<OII_MSEG_LINE>-MBLNR = 1.
<OII_MSEG_LINE>-MJAHR = 1.
<OII_MSEG_LINE>-ZEILE = 1.
<OII_MSEG_LINE>-BWART = 1.
<OII_MSEG_LINE>-MATNR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_OII_MSEG_LINE-WERKS, sy-vline,
  WA_OII_MSEG_LINE-LGORT, sy-vline,
  WA_OII_MSEG_LINE-CHARG, sy-vline,
  WA_OII_MSEG_LINE-BWTAR, sy-vline,
  WA_OII_MSEG_LINE-XAUTO, sy-vline,
  WA_OII_MSEG_LINE-INSMK, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_OII_MSEG_LINE 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_OII_MSEG_LINE 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_OII_MSEG_LINE INTO WA_OII_MSEG_LINE.


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

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

*Conversion exit MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_OII_MSEG_LINE-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_OII_MSEG_LINE-MATNR.
WRITE:/ 'New Value:', ld_input.

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

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

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

*Conversion exit ABPSP, internal->external for field PS_PSP_PNR
CALL FUNCTION 'CONVERSION_EXIT_ABPSP_OUTPUT'
  EXPORTING
    input =                      WA_OII_MSEG_LINE-PS_PSP_PNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_OII_MSEG_LINE-PS_PSP_PNR.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit ABPSP, internal->external for field MAT_PSPNR
CALL FUNCTION 'CONVERSION_EXIT_ABPSP_OUTPUT'
  EXPORTING
    input =                      WA_OII_MSEG_LINE-MAT_PSPNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_OII_MSEG_LINE-MAT_PSPNR.
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_OII_MSEG_LINE_STR, 
MBLNR TYPE STRING,
MJAHR TYPE STRING,
ZEILE TYPE STRING,
BWART TYPE STRING,
MATNR TYPE STRING,
WERKS TYPE STRING,
LGORT TYPE STRING,
CHARG TYPE STRING,
BWTAR TYPE STRING,
XAUTO TYPE STRING,
INSMK TYPE STRING,
SOBKZ TYPE STRING,
SHKZG TYPE STRING,
LIFNR TYPE STRING,
KDAUF TYPE STRING,
KDPOS TYPE STRING,
MENGE TYPE STRING,
MEINS TYPE STRING,
PS_PSP_PNR TYPE STRING,
BUSTM TYPE STRING,
MAT_KDAUF TYPE STRING,
MAT_KDPOS TYPE STRING,
MAT_PSPNR TYPE STRING,
OIB_TIMESTAMP TYPE STRING,
BUDAT TYPE STRING,
OIB_BLTIME TYPE STRING,
MENGE_V TYPE STRING,END OF T_EKKO_STR.
DATA: WA_OII_MSEG_LINE_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_OII_MSEG_LINE_STR-MBLNR sy-vline 
WA_OII_MSEG_LINE_STR-MJAHR sy-vline 
WA_OII_MSEG_LINE_STR-ZEILE sy-vline 
WA_OII_MSEG_LINE_STR-BWART sy-vline 
WA_OII_MSEG_LINE_STR-MATNR sy-vline 
WA_OII_MSEG_LINE_STR-WERKS sy-vline 
WA_OII_MSEG_LINE_STR-LGORT sy-vline 
WA_OII_MSEG_LINE_STR-CHARG sy-vline 
WA_OII_MSEG_LINE_STR-BWTAR sy-vline 
WA_OII_MSEG_LINE_STR-XAUTO sy-vline 
WA_OII_MSEG_LINE_STR-INSMK sy-vline 
WA_OII_MSEG_LINE_STR-SOBKZ sy-vline 
WA_OII_MSEG_LINE_STR-SHKZG sy-vline 
WA_OII_MSEG_LINE_STR-LIFNR sy-vline 
WA_OII_MSEG_LINE_STR-KDAUF sy-vline 
WA_OII_MSEG_LINE_STR-KDPOS sy-vline 
WA_OII_MSEG_LINE_STR-MENGE sy-vline 
WA_OII_MSEG_LINE_STR-MEINS sy-vline 
WA_OII_MSEG_LINE_STR-PS_PSP_PNR sy-vline 
WA_OII_MSEG_LINE_STR-BUSTM sy-vline 
WA_OII_MSEG_LINE_STR-MAT_KDAUF sy-vline 
WA_OII_MSEG_LINE_STR-MAT_KDPOS sy-vline 
WA_OII_MSEG_LINE_STR-MAT_PSPNR sy-vline 
WA_OII_MSEG_LINE_STR-OIB_TIMESTAMP sy-vline 
WA_OII_MSEG_LINE_STR-BUDAT sy-vline 
WA_OII_MSEG_LINE_STR-OIB_BLTIME sy-vline 
WA_OII_MSEG_LINE_STR-MENGE_V sy-vline      INTO ld_text SEPARATED BY SPACE.

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