ABAP Select data from SAP table T5W1N into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP T5W1N 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 T5W1N. 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 T5W1N 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_T5W1N TYPE STANDARD TABLE OF T5W1N,
      WA_T5W1N TYPE T5W1N,
      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: <T5W1N> TYPE T5W1N.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_T5W1N.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM T5W1N
  INTO TABLE IT_T5W1N.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM T5W1N
*  INTO TABLE @DATA(IT_T5W1N2).
*--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_T5W1N INDEX 1 INTO DATA(WA_T5W1N2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_T5W1N ASSIGNING <T5W1N>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<T5W1N>-MANDT = 1.
<T5W1N>-SVSPA = 1.
<T5W1N>-KVSCH = 1.
<T5W1N>-KVGES = 1.
<T5W1N>-ENDDA = 1.

ENDLOOP.

LOOP AT IT_T5W1N INTO WA_T5W1N.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_T5W1N-BEGDA, sy-vline,
  WA_T5W1N-SVSCH, sy-vline,
  WA_T5W1N-DEPER, sy-vline,
  WA_T5W1N-COMAX, sy-vline,
  WA_T5W1N-KONST, sy-vline,
  WA_T5W1N-LGART, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_T5W1N 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_T5W1N 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_T5W1N INTO WA_T5W1N.


*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.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_T5W1N_STR, 
MANDT TYPE STRING,
SVSPA TYPE STRING,
KVSCH TYPE STRING,
KVGES TYPE STRING,
ENDDA TYPE STRING,
BEGDA TYPE STRING,
SVSCH TYPE STRING,
DEPER TYPE STRING,
COMAX TYPE STRING,
KONST TYPE STRING,
LGART TYPE STRING,
MODEL TYPE STRING,
SPECO TYPE STRING,
CLEAR TYPE STRING,
ZEINH TYPE STRING,
MAIND TYPE STRING,
FNDOP TYPE STRING,
CATFC TYPE STRING,END OF T_EKKO_STR.
DATA: WA_T5W1N_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_T5W1N_STR-MANDT sy-vline 
WA_T5W1N_STR-SVSPA sy-vline 
WA_T5W1N_STR-KVSCH sy-vline 
WA_T5W1N_STR-KVGES sy-vline 
WA_T5W1N_STR-ENDDA sy-vline 
WA_T5W1N_STR-BEGDA sy-vline 
WA_T5W1N_STR-SVSCH sy-vline 
WA_T5W1N_STR-DEPER sy-vline 
WA_T5W1N_STR-COMAX sy-vline 
WA_T5W1N_STR-KONST sy-vline 
WA_T5W1N_STR-LGART sy-vline 
WA_T5W1N_STR-MODEL sy-vline 
WA_T5W1N_STR-SPECO sy-vline 
WA_T5W1N_STR-CLEAR sy-vline 
WA_T5W1N_STR-ZEINH sy-vline 
WA_T5W1N_STR-MAIND sy-vline 
WA_T5W1N_STR-FNDOP sy-vline 
WA_T5W1N_STR-CATFC sy-vline      INTO ld_text SEPARATED BY SPACE.

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