ABAP Select data from SAP table T023D into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP T023D 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 T023D. 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 T023D 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_T023D TYPE STANDARD TABLE OF T023D,
      WA_T023D TYPE T023D,
      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: <T023D> TYPE T023D.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_T023D.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM T023D
  INTO TABLE IT_T023D.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM T023D
*  INTO TABLE @DATA(IT_T023D2).
*--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_T023D INDEX 1 INTO DATA(WA_T023D2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_T023D ASSIGNING <T023D>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<T023D>-MANDT = 1.
<T023D>-MATKL = 1.
<T023D>-SPART = 1.
<T023D>-LREF3 = 1.
<T023D>-WWGDA = 1.

ENDLOOP.

LOOP AT IT_T023D INTO WA_T023D.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_T023D-WWGPA, sy-vline,
  WA_T023D-ABTNR, sy-vline,
  WA_T023D-BEGRU, sy-vline,
  WA_T023D-GEWEI, sy-vline,
  WA_T023D-J_1BNBM, sy-vline,
  WA_T023D-BKLAS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_T023D 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_T023D 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_T023D INTO WA_T023D.


*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 WWGDA
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_T023D-WWGDA
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_T023D-WWGDA.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field WWGPA
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_T023D-WWGPA
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_T023D-WWGPA.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field GEWEI
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_T023D-GEWEI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_T023D-GEWEI.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ANLKL
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_T023D-ANLKL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_T023D-ANLKL.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field WWGHA
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_T023D-WWGHA
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_T023D-WWGHA.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MSEHI
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_T023D-MSEHI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_T023D-MSEHI.
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_T023D_STR, 
MANDT TYPE STRING,
MATKL TYPE STRING,
SPART TYPE STRING,
LREF3 TYPE STRING,
WWGDA TYPE STRING,
WWGPA TYPE STRING,
ABTNR TYPE STRING,
BEGRU TYPE STRING,
GEWEI TYPE STRING,
J_1BNBM TYPE STRING,
BKLAS TYPE STRING,
EKWSL TYPE STRING,
ANLKL TYPE STRING,
DEF_SCHDSC TYPE STRING,
PRICE_GROUP TYPE STRING,
SELKZ TYPE STRING,
STUFE TYPE STRING,
WWGHA TYPE STRING,
WWGHB TYPE STRING,
MSEHI TYPE STRING,
MSEHT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_T023D_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_T023D_STR-MANDT sy-vline 
WA_T023D_STR-MATKL sy-vline 
WA_T023D_STR-SPART sy-vline 
WA_T023D_STR-LREF3 sy-vline 
WA_T023D_STR-WWGDA sy-vline 
WA_T023D_STR-WWGPA sy-vline 
WA_T023D_STR-ABTNR sy-vline 
WA_T023D_STR-BEGRU sy-vline 
WA_T023D_STR-GEWEI sy-vline 
WA_T023D_STR-J_1BNBM sy-vline 
WA_T023D_STR-BKLAS sy-vline 
WA_T023D_STR-EKWSL sy-vline 
WA_T023D_STR-ANLKL sy-vline 
WA_T023D_STR-DEF_SCHDSC sy-vline 
WA_T023D_STR-PRICE_GROUP sy-vline 
WA_T023D_STR-SELKZ sy-vline 
WA_T023D_STR-STUFE sy-vline 
WA_T023D_STR-WWGHA sy-vline 
WA_T023D_STR-WWGHB sy-vline 
WA_T023D_STR-MSEHI sy-vline 
WA_T023D_STR-MSEHT sy-vline      INTO ld_text SEPARATED BY SPACE.

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