ABAP Select data from SAP table MCW_MATRL into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MCW_MATRL
*  INTO TABLE @DATA(IT_MCW_MATRL2).
*--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_MCW_MATRL INDEX 1 INTO DATA(WA_MCW_MATRL2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MCW_MATRL>-PRDHA = 1.
<MCW_MATRL>-SAISO = 1.
<MCW_MATRL>-SAISJ = 1.
<MCW_MATRL>-PLGTP = 1.
<MCW_MATRL>-BWVOR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MCW_MATRL-BWSCL, sy-vline,
  WA_MCW_MATRL-SERVG, sy-vline,
  WA_MCW_MATRL-MTART, sy-vline,
  WA_MCW_MATRL-ATTYP, sy-vline,
  WA_MCW_MATRL-EKGRP, sy-vline,
  WA_MCW_MATRL-DISPO, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MCW_MATRL 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_MCW_MATRL 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_MCW_MATRL INTO WA_MCW_MATRL.


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

*Conversion exit MATN1, internal->external for field SATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_MCW_MATRL-SATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCW_MATRL-SATNR.
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_MCW_MATRL_STR, 
PRDHA TYPE STRING,
SAISO TYPE STRING,
SAISJ TYPE STRING,
PLGTP TYPE STRING,
BWVOR TYPE STRING,
BWSCL TYPE STRING,
SERVG TYPE STRING,
MTART TYPE STRING,
ATTYP TYPE STRING,
EKGRP TYPE STRING,
DISPO TYPE STRING,
SATNR TYPE STRING,
SUBRC TYPE STRING,
SUBRC1 TYPE STRING,
SUBRC2 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MCW_MATRL_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_MCW_MATRL_STR-PRDHA sy-vline 
WA_MCW_MATRL_STR-SAISO sy-vline 
WA_MCW_MATRL_STR-SAISJ sy-vline 
WA_MCW_MATRL_STR-PLGTP sy-vline 
WA_MCW_MATRL_STR-BWVOR sy-vline 
WA_MCW_MATRL_STR-BWSCL sy-vline 
WA_MCW_MATRL_STR-SERVG sy-vline 
WA_MCW_MATRL_STR-MTART sy-vline 
WA_MCW_MATRL_STR-ATTYP sy-vline 
WA_MCW_MATRL_STR-EKGRP sy-vline 
WA_MCW_MATRL_STR-DISPO sy-vline 
WA_MCW_MATRL_STR-SATNR sy-vline 
WA_MCW_MATRL_STR-SUBRC sy-vline 
WA_MCW_MATRL_STR-SUBRC1 sy-vline 
WA_MCW_MATRL_STR-SUBRC2 sy-vline      INTO ld_text SEPARATED BY SPACE.

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