ABAP Select data from SAP table MATS_AVAIL into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MATS_AVAIL
*  INTO TABLE @DATA(IT_MATS_AVAIL2).
*--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_MATS_AVAIL INDEX 1 INTO DATA(WA_MATS_AVAIL2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MATS_AVAIL>-MATNR = 1.
<MATS_AVAIL>-VRKME = 1.
<MATS_AVAIL>-ARKTX = 1.
<MATS_AVAIL>-VFPMNG = 1.
<MATS_AVAIL>-MEINS = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MATS_AVAIL-UMREF, sy-vline,
  WA_MATS_AVAIL-UMVKN, sy-vline,
  WA_MATS_AVAIL-UMVKZ, sy-vline,
  WA_MATS_AVAIL-AVQTY, sy-vline,
  WA_MATS_AVAIL-FULLAVDAT, sy-vline,
  WA_MATS_AVAIL-REQQTY, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MATS_AVAIL 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_MATS_AVAIL 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_MATS_AVAIL INTO WA_MATS_AVAIL.


*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_MATS_AVAIL-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MATS_AVAIL-MATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field VRKME
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_MATS_AVAIL-VRKME
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MATS_AVAIL-VRKME.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MEINS
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_MATS_AVAIL-MEINS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MATS_AVAIL-MEINS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field MATWA
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_MATS_AVAIL-MATWA
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MATS_AVAIL-MATWA.
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_MATS_AVAIL_STR, 
MATNR TYPE STRING,
VRKME TYPE STRING,
ARKTX TYPE STRING,
VFPMNG TYPE STRING,
MEINS TYPE STRING,
UMREF TYPE STRING,
UMVKN TYPE STRING,
UMVKZ TYPE STRING,
AVQTY TYPE STRING,
FULLAVDAT TYPE STRING,
REQQTY TYPE STRING,
FULLAVQTY TYPE STRING,
MSGNO TYPE STRING,
MSGID TYPE STRING,
MSGV1 TYPE STRING,
MSGV2 TYPE STRING,
MSGV3 TYPE STRING,
MSGV4 TYPE STRING,
MATWA TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MATS_AVAIL_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_MATS_AVAIL_STR-MATNR sy-vline 
WA_MATS_AVAIL_STR-VRKME sy-vline 
WA_MATS_AVAIL_STR-ARKTX sy-vline 
WA_MATS_AVAIL_STR-VFPMNG sy-vline 
WA_MATS_AVAIL_STR-MEINS sy-vline 
WA_MATS_AVAIL_STR-UMREF sy-vline 
WA_MATS_AVAIL_STR-UMVKN sy-vline 
WA_MATS_AVAIL_STR-UMVKZ sy-vline 
WA_MATS_AVAIL_STR-AVQTY sy-vline 
WA_MATS_AVAIL_STR-FULLAVDAT sy-vline 
WA_MATS_AVAIL_STR-REQQTY sy-vline 
WA_MATS_AVAIL_STR-FULLAVQTY sy-vline 
WA_MATS_AVAIL_STR-MSGNO sy-vline 
WA_MATS_AVAIL_STR-MSGID sy-vline 
WA_MATS_AVAIL_STR-MSGV1 sy-vline 
WA_MATS_AVAIL_STR-MSGV2 sy-vline 
WA_MATS_AVAIL_STR-MSGV3 sy-vline 
WA_MATS_AVAIL_STR-MSGV4 sy-vline 
WA_MATS_AVAIL_STR-MATWA sy-vline      INTO ld_text SEPARATED BY SPACE.

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