ABAP Select data from SAP table MECDGRID into internal table

Get Example source ABAP code based on a different SAP table
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Below is a number of ABAP code snippets to demonstrate how to select data from SAP MECDGRID 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 MECDGRID. 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 MECDGRID 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_MECDGRID TYPE STANDARD TABLE OF MECDGRID,
      WA_MECDGRID TYPE MECDGRID,
      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: <MECDGRID> TYPE MECDGRID.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MECDGRID
*  INTO TABLE @DATA(IT_MECDGRID2).
*--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_MECDGRID INDEX 1 INTO DATA(WA_MECDGRID2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MECDGRID>-OBJECTCLAS = 1.
<MECDGRID>-OBJECTID = 1.
<MECDGRID>-CHANGENR = 1.
<MECDGRID>-USERNAME = 1.
<MECDGRID>-UDATE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MECDGRID-UTIME, sy-vline,
  WA_MECDGRID-TCODE, sy-vline,
  WA_MECDGRID-TABNAME, sy-vline,
  WA_MECDGRID-TABKEY, sy-vline,
  WA_MECDGRID-KEYLEN, sy-vline,
  WA_MECDGRID-CHNGIND, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MECDGRID 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_MECDGRID 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_MECDGRID INTO WA_MECDGRID.


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

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

*Conversion exit ISOLA, internal->external for field SPRACHE
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_MECDGRID-SPRACHE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MECDGRID-SPRACHE.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit PARVW, internal->external for field PARVW
CALL FUNCTION 'CONVERSION_EXIT_PARVW_OUTPUT'
  EXPORTING
    input =                      WA_MECDGRID-PARVW
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MECDGRID-PARVW.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field REVNO
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MECDGRID-REVNO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MECDGRID-REVNO.
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_MECDGRID_STR, 
OBJECTCLAS TYPE STRING,
OBJECTID TYPE STRING,
CHANGENR TYPE STRING,
USERNAME TYPE STRING,
UDATE TYPE STRING,
UTIME TYPE STRING,
TCODE TYPE STRING,
TABNAME TYPE STRING,
TABKEY TYPE STRING,
KEYLEN TYPE STRING,
CHNGIND TYPE STRING,
FNAME TYPE STRING,
FTEXT TYPE STRING,
TEXTART TYPE STRING,
SPRACHE TYPE STRING,
TEXT_CASE TYPE STRING,
OUTLEN TYPE STRING,
F_OLD TYPE STRING,
F_NEW TYPE STRING,
KEYGUID TYPE STRING,
TABKEY254 TYPE STRING,
EXT_KEYLEN TYPE STRING,
KEYGUID_STR TYPE STRING,
VERSION TYPE STRING,
EKKEY TYPE STRING,
CDDEP TYPE STRING,
CDOUT TYPE STRING,
CDSEL TYPE STRING,
CDGRP TYPE STRING,
CDIGN TYPE STRING,
CDIGNV TYPE STRING,
EBELN TYPE STRING,
EBELP TYPE STRING,
ZEKKN TYPE STRING,
ETENR TYPE STRING,
ABRUF TYPE STRING,
EKORG TYPE STRING,
LTSNR TYPE STRING,
WERKS TYPE STRING,
PARVW TYPE STRING,
PARZA TYPE STRING,
CONSNUMBER TYPE STRING,
COMM_TYPE TYPE STRING,
REVNO TYPE STRING,
EXTGROUP TYPE STRING,
EXTROW TYPE STRING,
NUMKN TYPE STRING,
ETEXT TYPE STRING,
ETEXT1 TYPE STRING,
EKKEY1 TYPE STRING,
ACTION TYPE STRING,
SELKZ TYPE STRING,
UNDOF TYPE STRING,
UNDOICON TYPE STRING,
UNIT_OLD TYPE STRING,
UNIT_NEW TYPE STRING,
CUKY_OLD TYPE STRING,
CUKY_NEW TYPE STRING,
VALUE_NEW TYPE STRING,
VALUE_OLD TYPE STRING,
CELL_LAYOUT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MECDGRID_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_MECDGRID_STR-OBJECTCLAS sy-vline 
WA_MECDGRID_STR-OBJECTID sy-vline 
WA_MECDGRID_STR-CHANGENR sy-vline 
WA_MECDGRID_STR-USERNAME sy-vline 
WA_MECDGRID_STR-UDATE sy-vline 
WA_MECDGRID_STR-UTIME sy-vline 
WA_MECDGRID_STR-TCODE sy-vline 
WA_MECDGRID_STR-TABNAME sy-vline 
WA_MECDGRID_STR-TABKEY sy-vline 
WA_MECDGRID_STR-KEYLEN sy-vline 
WA_MECDGRID_STR-CHNGIND sy-vline 
WA_MECDGRID_STR-FNAME sy-vline 
WA_MECDGRID_STR-FTEXT sy-vline 
WA_MECDGRID_STR-TEXTART sy-vline 
WA_MECDGRID_STR-SPRACHE sy-vline 
WA_MECDGRID_STR-TEXT_CASE sy-vline 
WA_MECDGRID_STR-OUTLEN sy-vline 
WA_MECDGRID_STR-F_OLD sy-vline 
WA_MECDGRID_STR-F_NEW sy-vline 
WA_MECDGRID_STR-KEYGUID sy-vline 
WA_MECDGRID_STR-TABKEY254 sy-vline 
WA_MECDGRID_STR-EXT_KEYLEN sy-vline 
WA_MECDGRID_STR-KEYGUID_STR sy-vline 
WA_MECDGRID_STR-VERSION sy-vline 
WA_MECDGRID_STR-EKKEY sy-vline 
WA_MECDGRID_STR-CDDEP sy-vline 
WA_MECDGRID_STR-CDOUT sy-vline 
WA_MECDGRID_STR-CDSEL sy-vline 
WA_MECDGRID_STR-CDGRP sy-vline 
WA_MECDGRID_STR-CDIGN sy-vline 
WA_MECDGRID_STR-CDIGNV sy-vline 
WA_MECDGRID_STR-EBELN sy-vline 
WA_MECDGRID_STR-EBELP sy-vline 
WA_MECDGRID_STR-ZEKKN sy-vline 
WA_MECDGRID_STR-ETENR sy-vline 
WA_MECDGRID_STR-ABRUF sy-vline 
WA_MECDGRID_STR-EKORG sy-vline 
WA_MECDGRID_STR-LTSNR sy-vline 
WA_MECDGRID_STR-WERKS sy-vline 
WA_MECDGRID_STR-PARVW sy-vline 
WA_MECDGRID_STR-PARZA sy-vline 
WA_MECDGRID_STR-CONSNUMBER sy-vline 
WA_MECDGRID_STR-COMM_TYPE sy-vline 
WA_MECDGRID_STR-REVNO sy-vline 
WA_MECDGRID_STR-EXTGROUP sy-vline 
WA_MECDGRID_STR-EXTROW sy-vline 
WA_MECDGRID_STR-NUMKN sy-vline 
WA_MECDGRID_STR-ETEXT sy-vline 
WA_MECDGRID_STR-ETEXT1 sy-vline 
WA_MECDGRID_STR-EKKEY1 sy-vline 
WA_MECDGRID_STR-ACTION sy-vline 
WA_MECDGRID_STR-SELKZ sy-vline 
WA_MECDGRID_STR-UNDOF sy-vline 
WA_MECDGRID_STR-UNDOICON sy-vline 
WA_MECDGRID_STR-UNIT_OLD sy-vline 
WA_MECDGRID_STR-UNIT_NEW sy-vline 
WA_MECDGRID_STR-CUKY_OLD sy-vline 
WA_MECDGRID_STR-CUKY_NEW sy-vline 
WA_MECDGRID_STR-VALUE_NEW sy-vline 
WA_MECDGRID_STR-VALUE_OLD sy-vline 
WA_MECDGRID_STR-CELL_LAYOUT sy-vline      INTO ld_text SEPARATED BY SPACE.

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