ABAP Select data from SAP table WTAD_AMT into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WTAD_AMT
*  INTO TABLE @DATA(IT_WTAD_AMT2).
*--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_WTAD_AMT INDEX 1 INTO DATA(WA_WTAD_AMT2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WTAD_AMT>-ADDIMAT = 1.
<WTAD_AMT>-ADDIMAT_KTX = 1.
<WTAD_AMT>-ADDIMATKL = 1.
<WTAD_AMT>-ADDIMATKL_TXT = 1.
<WTAD_AMT>-ADDIFM = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WTAD_AMT-ADDIMENGE, sy-vline,
  WA_WTAD_AMT-ADDIMEINS, sy-vline,
  WA_WTAD_AMT-ADDIAPPL, sy-vline,
  WA_WTAD_AMT-ADDIOPER, sy-vline,
  WA_WTAD_AMT-ADDISIDOC, sy-vline,
  WA_WTAD_AMT-ADDISIDOCFB, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WTAD_AMT 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_WTAD_AMT 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_WTAD_AMT INTO WA_WTAD_AMT.


*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 ADDIMAT
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_WTAD_AMT-ADDIMAT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WTAD_AMT-ADDIMAT.
WRITE:/ 'New Value:', ld_input.

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

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

*Conversion exit ALPHA, internal->external for field ADDIEBELN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_WTAD_AMT-ADDIEBELN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WTAD_AMT-ADDIEBELN.
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_WTAD_AMT_STR, 
ADDIMAT TYPE STRING,
ADDIMAT_KTX TYPE STRING,
ADDIMATKL TYPE STRING,
ADDIMATKL_TXT TYPE STRING,
ADDIFM TYPE STRING,
ADDIMENGE TYPE STRING,
ADDIMEINS TYPE STRING,
ADDIAPPL TYPE STRING,
ADDIOPER TYPE STRING,
ADDISIDOC TYPE STRING,
ADDISIDOCFB TYPE STRING,
ADDISPOOK TYPE STRING,
ADDISBAPI TYPE STRING,
ADDISORDP TYPE STRING,
ADDISWEKZ TYPE STRING,
ADDILIFNR TYPE STRING,
ADDIEBELN TYPE STRING,
ADDIEBELP TYPE STRING,
ADDIINVOC TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WTAD_AMT_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_WTAD_AMT_STR-ADDIMAT sy-vline 
WA_WTAD_AMT_STR-ADDIMAT_KTX sy-vline 
WA_WTAD_AMT_STR-ADDIMATKL sy-vline 
WA_WTAD_AMT_STR-ADDIMATKL_TXT sy-vline 
WA_WTAD_AMT_STR-ADDIFM sy-vline 
WA_WTAD_AMT_STR-ADDIMENGE sy-vline 
WA_WTAD_AMT_STR-ADDIMEINS sy-vline 
WA_WTAD_AMT_STR-ADDIAPPL sy-vline 
WA_WTAD_AMT_STR-ADDIOPER sy-vline 
WA_WTAD_AMT_STR-ADDISIDOC sy-vline 
WA_WTAD_AMT_STR-ADDISIDOCFB sy-vline 
WA_WTAD_AMT_STR-ADDISPOOK sy-vline 
WA_WTAD_AMT_STR-ADDISBAPI sy-vline 
WA_WTAD_AMT_STR-ADDISORDP sy-vline 
WA_WTAD_AMT_STR-ADDISWEKZ sy-vline 
WA_WTAD_AMT_STR-ADDILIFNR sy-vline 
WA_WTAD_AMT_STR-ADDIEBELN sy-vline 
WA_WTAD_AMT_STR-ADDIEBELP sy-vline 
WA_WTAD_AMT_STR-ADDIINVOC sy-vline      INTO ld_text SEPARATED BY SPACE.

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