ABAP Select data from SAP table TXW_MATVAL into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TXW_MATVAL
*  INTO TABLE @DATA(IT_TXW_MATVAL2).
*--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_TXW_MATVAL INDEX 1 INTO DATA(WA_TXW_MATVAL2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TXW_MATVAL>-MANDT = 1.
<TXW_MATVAL>-MATNR = 1.
<TXW_MATVAL>-BWKEY = 1.
<TXW_MATVAL>-BWTAR = 1.
<TXW_MATVAL>-GJAHR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TXW_MATVAL-MONAT, sy-vline,
  WA_TXW_MATVAL-BWTTY, sy-vline,
  WA_TXW_MATVAL-BKLAS, sy-vline,
  WA_TXW_MATVAL-LBKUM, sy-vline,
  WA_TXW_MATVAL-LFGJA, sy-vline,
  WA_TXW_MATVAL-LFMON, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TXW_MATVAL 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_TXW_MATVAL 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_TXW_MATVAL INTO WA_TXW_MATVAL.


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

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

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

*Conversion exit CUNIT, internal->external for field MEINS
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_TXW_MATVAL-MEINS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TXW_MATVAL-MEINS.
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_TXW_MATVAL_STR, 
MANDT TYPE STRING,
MATNR TYPE STRING,
BWKEY TYPE STRING,
BWTAR TYPE STRING,
GJAHR TYPE STRING,
MONAT TYPE STRING,
BWTTY TYPE STRING,
BKLAS TYPE STRING,
LBKUM TYPE STRING,
LFGJA TYPE STRING,
LFMON TYPE STRING,
MYPOL TYPE STRING,
VVJLB TYPE STRING,
VVJSL TYPE STRING,
XLIFO TYPE STRING,
MEINS TYPE STRING,
VPRSV TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TXW_MATVAL_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_TXW_MATVAL_STR-MANDT sy-vline 
WA_TXW_MATVAL_STR-MATNR sy-vline 
WA_TXW_MATVAL_STR-BWKEY sy-vline 
WA_TXW_MATVAL_STR-BWTAR sy-vline 
WA_TXW_MATVAL_STR-GJAHR sy-vline 
WA_TXW_MATVAL_STR-MONAT sy-vline 
WA_TXW_MATVAL_STR-BWTTY sy-vline 
WA_TXW_MATVAL_STR-BKLAS sy-vline 
WA_TXW_MATVAL_STR-LBKUM sy-vline 
WA_TXW_MATVAL_STR-LFGJA sy-vline 
WA_TXW_MATVAL_STR-LFMON sy-vline 
WA_TXW_MATVAL_STR-MYPOL sy-vline 
WA_TXW_MATVAL_STR-VVJLB sy-vline 
WA_TXW_MATVAL_STR-VVJSL sy-vline 
WA_TXW_MATVAL_STR-XLIFO sy-vline 
WA_TXW_MATVAL_STR-MEINS sy-vline 
WA_TXW_MATVAL_STR-VPRSV sy-vline      INTO ld_text SEPARATED BY SPACE.

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