ABAP Select data from SAP table MPEV_COMP_OAI_EN into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MPEV_COMP_OAI_EN
*  INTO TABLE @DATA(IT_MPEV_COMP_OAI_EN2).
*--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_MPEV_COMP_OAI_EN INDEX 1 INTO DATA(WA_MPEV_COMP_OAI_EN2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MPEV_COMP_OAI_EN>-MANDT = 1.
<MPEV_COMP_OAI_EN>-RSNUM = 1.
<MPEV_COMP_OAI_EN>-RSPOS = 1.
<MPEV_COMP_OAI_EN>-RSART = 1.
<MPEV_COMP_OAI_EN>-OAN_INSTANCE_ID = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MPEV_COMP_OAI_EN-OAN_ELEMENT_NUMBER, sy-vline,
  WA_MPEV_COMP_OAI_EN-USAGE_QTY, sy-vline,
  WA_MPEV_COMP_OAI_EN-USAGE_NET_QTY, sy-vline,
  WA_MPEV_COMP_OAI_EN-SEQUENCE_NO, sy-vline,
  WA_MPEV_COMP_OAI_EN-ZUONR, sy-vline,
  WA_MPEV_COMP_OAI_EN-LOG_COMP_COUNTER, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MPEV_COMP_OAI_EN 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_MPEV_COMP_OAI_EN 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_MPEV_COMP_OAI_EN INTO WA_MPEV_COMP_OAI_EN.


*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 MEINS
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_MPEV_COMP_OAI_EN-MEINS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MPEV_COMP_OAI_EN-MEINS.
WRITE:/ 'New Value:', ld_input.

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

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

*Conversion exit NUMCV, internal->external for field VORNR
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_MPEV_COMP_OAI_EN-VORNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MPEV_COMP_OAI_EN-VORNR.
WRITE:/ 'New Value:', ld_input.

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

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

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

*Conversion exit NUMCV, internal->external for field POSNR
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_MPEV_COMP_OAI_EN-POSNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MPEV_COMP_OAI_EN-POSNR.
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_MPEV_COMP_OAI_EN_STR, 
MANDT TYPE STRING,
RSNUM TYPE STRING,
RSPOS TYPE STRING,
RSART TYPE STRING,
OAN_INSTANCE_ID TYPE STRING,
OAN_ELEMENT_NUMBER TYPE STRING,
USAGE_QTY TYPE STRING,
USAGE_NET_QTY TYPE STRING,
SEQUENCE_NO TYPE STRING,
ZUONR TYPE STRING,
LOG_COMP_COUNTER TYPE STRING,
ASSEMBLY_TYPE TYPE STRING,
RSNUM_REFERENCE TYPE STRING,
RSPOS_REFERENCE TYPE STRING,
RSART_REFERENCE TYPE STRING,
OANI_ID_REFERENCE TYPE STRING,
OAN_ELEM_NO_REFERENCE TYPE STRING,
INSTANCE_ASSEMBLY_RQD TYPE STRING,
MPE_STOCK_TYPE TYPE STRING,
RSNUM_TOP_REFERENCE TYPE STRING,
RSPOS_TOP_REFERENCE TYPE STRING,
RSART_TOP_REFERENCE TYPE STRING,
OANI_ID_TOP_REFERENCE TYPE STRING,
OAN_ELEM_NO_TOP_REFERENCE TYPE STRING,
MRS_LEAF_ASSIGNMENT_UUID TYPE STRING,
MRS_ITEM_DETAIL_UUID TYPE STRING,
MRS_ITEM_DETAIL_IS_CONTEXTUAL TYPE STRING,
XLOEK TYPE STRING,
XWAOK TYPE STRING,
SOBKZ TYPE STRING,
CHARG TYPE STRING,
BDMNG TYPE STRING,
MEINS TYPE STRING,
ESMNG TYPE STRING,
ENMNG TYPE STRING,
SHKZG TYPE STRING,
MATNR TYPE STRING,
WERKS TYPE STRING,
LGORT TYPE STRING,
PRVBE TYPE STRING,
AUFNR TYPE STRING,
BWART TYPE STRING,
POSTP TYPE STRING,
SCHGT TYPE STRING,
RGEKZ TYPE STRING,
AUFPL TYPE STRING,
APLZL TYPE STRING,
VORNR TYPE STRING,
BAUGR TYPE STRING,
PSPEL TYPE STRING,
KDAUF TYPE STRING,
KDPOS TYPE STRING,
KDEIN TYPE STRING,
UMREZ TYPE STRING,
UMREN TYPE STRING,
POSNR TYPE STRING,
AFPOS TYPE STRING,
OBJNR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MPEV_COMP_OAI_EN_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_MPEV_COMP_OAI_EN_STR-MANDT sy-vline 
WA_MPEV_COMP_OAI_EN_STR-RSNUM sy-vline 
WA_MPEV_COMP_OAI_EN_STR-RSPOS sy-vline 
WA_MPEV_COMP_OAI_EN_STR-RSART sy-vline 
WA_MPEV_COMP_OAI_EN_STR-OAN_INSTANCE_ID sy-vline 
WA_MPEV_COMP_OAI_EN_STR-OAN_ELEMENT_NUMBER sy-vline 
WA_MPEV_COMP_OAI_EN_STR-USAGE_QTY sy-vline 
WA_MPEV_COMP_OAI_EN_STR-USAGE_NET_QTY sy-vline 
WA_MPEV_COMP_OAI_EN_STR-SEQUENCE_NO sy-vline 
WA_MPEV_COMP_OAI_EN_STR-ZUONR sy-vline 
WA_MPEV_COMP_OAI_EN_STR-LOG_COMP_COUNTER sy-vline 
WA_MPEV_COMP_OAI_EN_STR-ASSEMBLY_TYPE sy-vline 
WA_MPEV_COMP_OAI_EN_STR-RSNUM_REFERENCE sy-vline 
WA_MPEV_COMP_OAI_EN_STR-RSPOS_REFERENCE sy-vline 
WA_MPEV_COMP_OAI_EN_STR-RSART_REFERENCE sy-vline 
WA_MPEV_COMP_OAI_EN_STR-OANI_ID_REFERENCE sy-vline 
WA_MPEV_COMP_OAI_EN_STR-OAN_ELEM_NO_REFERENCE sy-vline 
WA_MPEV_COMP_OAI_EN_STR-INSTANCE_ASSEMBLY_RQD sy-vline 
WA_MPEV_COMP_OAI_EN_STR-MPE_STOCK_TYPE sy-vline 
WA_MPEV_COMP_OAI_EN_STR-RSNUM_TOP_REFERENCE sy-vline 
WA_MPEV_COMP_OAI_EN_STR-RSPOS_TOP_REFERENCE sy-vline 
WA_MPEV_COMP_OAI_EN_STR-RSART_TOP_REFERENCE sy-vline 
WA_MPEV_COMP_OAI_EN_STR-OANI_ID_TOP_REFERENCE sy-vline 
WA_MPEV_COMP_OAI_EN_STR-OAN_ELEM_NO_TOP_REFERENCE sy-vline 
WA_MPEV_COMP_OAI_EN_STR-MRS_LEAF_ASSIGNMENT_UUID sy-vline 
WA_MPEV_COMP_OAI_EN_STR-MRS_ITEM_DETAIL_UUID sy-vline 
WA_MPEV_COMP_OAI_EN_STR-MRS_ITEM_DETAIL_IS_CONTEXTUAL sy-vline 
WA_MPEV_COMP_OAI_EN_STR-XLOEK sy-vline 
WA_MPEV_COMP_OAI_EN_STR-XWAOK sy-vline 
WA_MPEV_COMP_OAI_EN_STR-SOBKZ sy-vline 
WA_MPEV_COMP_OAI_EN_STR-CHARG sy-vline 
WA_MPEV_COMP_OAI_EN_STR-BDMNG sy-vline 
WA_MPEV_COMP_OAI_EN_STR-MEINS sy-vline 
WA_MPEV_COMP_OAI_EN_STR-ESMNG sy-vline 
WA_MPEV_COMP_OAI_EN_STR-ENMNG sy-vline 
WA_MPEV_COMP_OAI_EN_STR-SHKZG sy-vline 
WA_MPEV_COMP_OAI_EN_STR-MATNR sy-vline 
WA_MPEV_COMP_OAI_EN_STR-WERKS sy-vline 
WA_MPEV_COMP_OAI_EN_STR-LGORT sy-vline 
WA_MPEV_COMP_OAI_EN_STR-PRVBE sy-vline 
WA_MPEV_COMP_OAI_EN_STR-AUFNR sy-vline 
WA_MPEV_COMP_OAI_EN_STR-BWART sy-vline 
WA_MPEV_COMP_OAI_EN_STR-POSTP sy-vline 
WA_MPEV_COMP_OAI_EN_STR-SCHGT sy-vline 
WA_MPEV_COMP_OAI_EN_STR-RGEKZ sy-vline 
WA_MPEV_COMP_OAI_EN_STR-AUFPL sy-vline 
WA_MPEV_COMP_OAI_EN_STR-APLZL sy-vline 
WA_MPEV_COMP_OAI_EN_STR-VORNR sy-vline 
WA_MPEV_COMP_OAI_EN_STR-BAUGR sy-vline 
WA_MPEV_COMP_OAI_EN_STR-PSPEL sy-vline 
WA_MPEV_COMP_OAI_EN_STR-KDAUF sy-vline 
WA_MPEV_COMP_OAI_EN_STR-KDPOS sy-vline 
WA_MPEV_COMP_OAI_EN_STR-KDEIN sy-vline 
WA_MPEV_COMP_OAI_EN_STR-UMREZ sy-vline 
WA_MPEV_COMP_OAI_EN_STR-UMREN sy-vline 
WA_MPEV_COMP_OAI_EN_STR-POSNR sy-vline 
WA_MPEV_COMP_OAI_EN_STR-AFPOS sy-vline 
WA_MPEV_COMP_OAI_EN_STR-OBJNR sy-vline      INTO ld_text SEPARATED BY SPACE.

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