ABAP Select data from SAP table V_OIU_ME_MREAD into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM V_OIU_ME_MREAD
*  INTO TABLE @DATA(IT_V_OIU_ME_MREAD2).
*--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_V_OIU_ME_MREAD INDEX 1 INTO DATA(WA_V_OIU_ME_MREAD2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<V_OIU_ME_MREAD>-MANDT = 1.
<V_OIU_ME_MREAD>-METYP = 1.
<V_OIU_ME_MREAD>-RDGID = 1.
<V_OIU_ME_MREAD>-RETYP = 1.
<V_OIU_ME_MREAD>-INCOL = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_V_OIU_ME_MREAD-INROW, sy-vline,
  WA_V_OIU_ME_MREAD-XACTV, sy-vline,
  WA_V_OIU_ME_MREAD-XREQD, sy-vline,
  WA_V_OIU_ME_MREAD-XSAPA, sy-vline,
  WA_V_OIU_ME_MREAD-XSAPR, sy-vline,
  WA_V_OIU_ME_MREAD-XDRVD, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_V_OIU_ME_MREAD 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_V_OIU_ME_MREAD 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_V_OIU_ME_MREAD INTO WA_V_OIU_ME_MREAD.


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

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

*Conversion exit ALPHA, internal->external for field MRGRP
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_V_OIU_ME_MREAD-MRGRP
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_V_OIU_ME_MREAD-MRGRP.
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_V_OIU_ME_MREAD_STR, 
MANDT TYPE STRING,
METYP TYPE STRING,
RDGID TYPE STRING,
RETYP TYPE STRING,
INCOL TYPE STRING,
INROW TYPE STRING,
XACTV TYPE STRING,
XREQD TYPE STRING,
XSAPA TYPE STRING,
XSAPR TYPE STRING,
XDRVD TYPE STRING,
XOBSV TYPE STRING,
MRTXS TYPE STRING,
MRTXL TYPE STRING,
RTTXT TYPE STRING,
MTTXT TYPE STRING,
XHIDE TYPE STRING,
XDISO TYPE STRING,
NCOPY TYPE STRING,
MRGRP TYPE STRING,
MRGRP_STXT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_V_OIU_ME_MREAD_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_V_OIU_ME_MREAD_STR-MANDT sy-vline 
WA_V_OIU_ME_MREAD_STR-METYP sy-vline 
WA_V_OIU_ME_MREAD_STR-RDGID sy-vline 
WA_V_OIU_ME_MREAD_STR-RETYP sy-vline 
WA_V_OIU_ME_MREAD_STR-INCOL sy-vline 
WA_V_OIU_ME_MREAD_STR-INROW sy-vline 
WA_V_OIU_ME_MREAD_STR-XACTV sy-vline 
WA_V_OIU_ME_MREAD_STR-XREQD sy-vline 
WA_V_OIU_ME_MREAD_STR-XSAPA sy-vline 
WA_V_OIU_ME_MREAD_STR-XSAPR sy-vline 
WA_V_OIU_ME_MREAD_STR-XDRVD sy-vline 
WA_V_OIU_ME_MREAD_STR-XOBSV sy-vline 
WA_V_OIU_ME_MREAD_STR-MRTXS sy-vline 
WA_V_OIU_ME_MREAD_STR-MRTXL sy-vline 
WA_V_OIU_ME_MREAD_STR-RTTXT sy-vline 
WA_V_OIU_ME_MREAD_STR-MTTXT sy-vline 
WA_V_OIU_ME_MREAD_STR-XHIDE sy-vline 
WA_V_OIU_ME_MREAD_STR-XDISO sy-vline 
WA_V_OIU_ME_MREAD_STR-NCOPY sy-vline 
WA_V_OIU_ME_MREAD_STR-MRGRP sy-vline 
WA_V_OIU_ME_MREAD_STR-MRGRP_STXT sy-vline      INTO ld_text SEPARATED BY SPACE.

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