ABAP Select data from SAP table MPEV_OA_INSTANCE into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP MPEV_OA_INSTANCE 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_OA_INSTANCE. 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_OA_INSTANCE 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_OA_INSTANCE TYPE STANDARD TABLE OF MPEV_OA_INSTANCE,
      WA_MPEV_OA_INSTANCE TYPE MPEV_OA_INSTANCE,
      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_OA_INSTANCE> TYPE MPEV_OA_INSTANCE.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MPEV_OA_INSTANCE
*  INTO TABLE @DATA(IT_MPEV_OA_INSTANCE2).
*--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_OA_INSTANCE INDEX 1 INTO DATA(WA_MPEV_OA_INSTANCE2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MPEV_OA_INSTANCE>-MANDT = 1.
<MPEV_OA_INSTANCE>-OAN_INSTANCE_ID = 1.
<MPEV_OA_INSTANCE>-OAN_ELEMENT_NUMBER = 1.
<MPEV_OA_INSTANCE>-SAS_NAME = 1.
<MPEV_OA_INSTANCE>-EXPD_YIELD = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MPEV_OA_INSTANCE-EXPD_SCRAP, sy-vline,
  WA_MPEV_OA_INSTANCE-UOM, sy-vline,
  WA_MPEV_OA_INSTANCE-EXPD_EXEC_DURN, sy-vline,
  WA_MPEV_OA_INSTANCE-EXPD_EXEC_LABOR_TIME, sy-vline,
  WA_MPEV_OA_INSTANCE-PLNTY, sy-vline,
  WA_MPEV_OA_INSTANCE-PLNNR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MPEV_OA_INSTANCE 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_OA_INSTANCE 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_OA_INSTANCE INTO WA_MPEV_OA_INSTANCE.


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

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

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

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

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

*Conversion exit ALPHA, internal->external for field OAN_ELEMENT_NUMBER_EXT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MPEV_OA_INSTANCE-OAN_ELEMENT_NUMBER_EXT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MPEV_OA_INSTANCE-OAN_ELEMENT_NUMBER_EXT.
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_OA_INSTANCE_STR, 
MANDT TYPE STRING,
OAN_INSTANCE_ID TYPE STRING,
OAN_ELEMENT_NUMBER TYPE STRING,
SAS_NAME TYPE STRING,
EXPD_YIELD TYPE STRING,
EXPD_SCRAP TYPE STRING,
UOM TYPE STRING,
EXPD_EXEC_DURN TYPE STRING,
EXPD_EXEC_LABOR_TIME TYPE STRING,
PLNTY TYPE STRING,
PLNNR TYPE STRING,
PLNAL TYPE STRING,
PLNKN TYPE STRING,
VERSN TYPE STRING,
SAS_STATUS_NAME TYPE STRING,
IS_FOR_RETROACT_POSTG TYPE STRING,
STS_LST_CHGD_BY_DOC_NMBR TYPE STRING,
OAN_ID TYPE STRING,
OAN_VERSION_NO TYPE STRING,
AUFNR TYPE STRING,
AUFPL TYPE STRING,
APLZL TYPE STRING,
SFI_CONF TYPE STRING,
CONF_ALLWD TYPE STRING,
CONF_NOT_ALLWD_RSN TYPE STRING,
SEGMENT_TYPE TYPE STRING,
ELEMENT_ID TYPE STRING,
ELEMENT_VERSION_NO TYPE STRING,
OAN_ELEMENT_NUMBER_EXT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MPEV_OA_INSTANCE_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_OA_INSTANCE_STR-MANDT sy-vline 
WA_MPEV_OA_INSTANCE_STR-OAN_INSTANCE_ID sy-vline 
WA_MPEV_OA_INSTANCE_STR-OAN_ELEMENT_NUMBER sy-vline 
WA_MPEV_OA_INSTANCE_STR-SAS_NAME sy-vline 
WA_MPEV_OA_INSTANCE_STR-EXPD_YIELD sy-vline 
WA_MPEV_OA_INSTANCE_STR-EXPD_SCRAP sy-vline 
WA_MPEV_OA_INSTANCE_STR-UOM sy-vline 
WA_MPEV_OA_INSTANCE_STR-EXPD_EXEC_DURN sy-vline 
WA_MPEV_OA_INSTANCE_STR-EXPD_EXEC_LABOR_TIME sy-vline 
WA_MPEV_OA_INSTANCE_STR-PLNTY sy-vline 
WA_MPEV_OA_INSTANCE_STR-PLNNR sy-vline 
WA_MPEV_OA_INSTANCE_STR-PLNAL sy-vline 
WA_MPEV_OA_INSTANCE_STR-PLNKN sy-vline 
WA_MPEV_OA_INSTANCE_STR-VERSN sy-vline 
WA_MPEV_OA_INSTANCE_STR-SAS_STATUS_NAME sy-vline 
WA_MPEV_OA_INSTANCE_STR-IS_FOR_RETROACT_POSTG sy-vline 
WA_MPEV_OA_INSTANCE_STR-STS_LST_CHGD_BY_DOC_NMBR sy-vline 
WA_MPEV_OA_INSTANCE_STR-OAN_ID sy-vline 
WA_MPEV_OA_INSTANCE_STR-OAN_VERSION_NO sy-vline 
WA_MPEV_OA_INSTANCE_STR-AUFNR sy-vline 
WA_MPEV_OA_INSTANCE_STR-AUFPL sy-vline 
WA_MPEV_OA_INSTANCE_STR-APLZL sy-vline 
WA_MPEV_OA_INSTANCE_STR-SFI_CONF sy-vline 
WA_MPEV_OA_INSTANCE_STR-CONF_ALLWD sy-vline 
WA_MPEV_OA_INSTANCE_STR-CONF_NOT_ALLWD_RSN sy-vline 
WA_MPEV_OA_INSTANCE_STR-SEGMENT_TYPE sy-vline 
WA_MPEV_OA_INSTANCE_STR-ELEMENT_ID sy-vline 
WA_MPEV_OA_INSTANCE_STR-ELEMENT_VERSION_NO sy-vline 
WA_MPEV_OA_INSTANCE_STR-OAN_ELEMENT_NUMBER_EXT sy-vline      INTO ld_text SEPARATED BY SPACE.

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