ABAP Select data from SAP table WTAD_MAMI into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP WTAD_MAMI 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_MAMI. 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_MAMI 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_MAMI TYPE STANDARD TABLE OF WTAD_MAMI,
      WA_WTAD_MAMI TYPE WTAD_MAMI,
      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_MAMI> TYPE WTAD_MAMI.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WTAD_MAMI
*  INTO TABLE @DATA(IT_WTAD_MAMI2).
*--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_MAMI INDEX 1 INTO DATA(WA_WTAD_MAMI2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WTAD_MAMI>-MATNR = 1.
<WTAD_MAMI>-MARKBOX = 1.
<WTAD_MAMI>-TRAFFICLIGHT = 1.
<WTAD_MAMI>-STATUS = 1.
<WTAD_MAMI>-LFDNR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WTAD_MAMI-ADDIVKME, sy-vline,
  WA_WTAD_MAMI-ADDIVKMET, sy-vline,
  WA_WTAD_MAMI-ADDIMAT, sy-vline,
  WA_WTAD_MAMI-ADDIMAKTX, sy-vline,
  WA_WTAD_MAMI-ADDICLINT, sy-vline,
  WA_WTAD_MAMI-ADDIKLART, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WTAD_MAMI 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_MAMI 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_MAMI INTO WA_WTAD_MAMI.


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

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

*Conversion exit MATN1, internal->external for field ADDIMAT
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_WTAD_MAMI-ADDIMAT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WTAD_MAMI-ADDIMAT.
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_MAMI_STR, 
MATNR TYPE STRING,
MARKBOX TYPE STRING,
TRAFFICLIGHT TYPE STRING,
STATUS TYPE STRING,
LFDNR TYPE STRING,
ADDIVKME TYPE STRING,
ADDIVKMET TYPE STRING,
ADDIMAT TYPE STRING,
ADDIMAKTX TYPE STRING,
ADDICLINT TYPE STRING,
ADDIKLART TYPE STRING,
ADDIKLARTT TYPE STRING,
ADDICLASS TYPE STRING,
ADDICLASST TYPE STRING,
ADDIFM TYPE STRING,
ADDIFMT TYPE STRING,
ADDIPRASS TYPE STRING,
ADDIPRASST TYPE STRING,
ADDICALC TYPE STRING,
ADDICALCT TYPE STRING,
ADDIINVOC TYPE STRING,
ADDIINVT TYPE STRING,
ADDIMTXID TYPE STRING,
ADDIMTXIDD TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WTAD_MAMI_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_MAMI_STR-MATNR sy-vline 
WA_WTAD_MAMI_STR-MARKBOX sy-vline 
WA_WTAD_MAMI_STR-TRAFFICLIGHT sy-vline 
WA_WTAD_MAMI_STR-STATUS sy-vline 
WA_WTAD_MAMI_STR-LFDNR sy-vline 
WA_WTAD_MAMI_STR-ADDIVKME sy-vline 
WA_WTAD_MAMI_STR-ADDIVKMET sy-vline 
WA_WTAD_MAMI_STR-ADDIMAT sy-vline 
WA_WTAD_MAMI_STR-ADDIMAKTX sy-vline 
WA_WTAD_MAMI_STR-ADDICLINT sy-vline 
WA_WTAD_MAMI_STR-ADDIKLART sy-vline 
WA_WTAD_MAMI_STR-ADDIKLARTT sy-vline 
WA_WTAD_MAMI_STR-ADDICLASS sy-vline 
WA_WTAD_MAMI_STR-ADDICLASST sy-vline 
WA_WTAD_MAMI_STR-ADDIFM sy-vline 
WA_WTAD_MAMI_STR-ADDIFMT sy-vline 
WA_WTAD_MAMI_STR-ADDIPRASS sy-vline 
WA_WTAD_MAMI_STR-ADDIPRASST sy-vline 
WA_WTAD_MAMI_STR-ADDICALC sy-vline 
WA_WTAD_MAMI_STR-ADDICALCT sy-vline 
WA_WTAD_MAMI_STR-ADDIINVOC sy-vline 
WA_WTAD_MAMI_STR-ADDIINVT sy-vline 
WA_WTAD_MAMI_STR-ADDIMTXID sy-vline 
WA_WTAD_MAMI_STR-ADDIMTXIDD sy-vline      INTO ld_text SEPARATED BY SPACE.

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