ABAP Select data from SAP table T7TW1L into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP T7TW1L 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 T7TW1L. 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 T7TW1L 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_T7TW1L TYPE STANDARD TABLE OF T7TW1L,
      WA_T7TW1L TYPE T7TW1L,
      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: <T7TW1L> TYPE T7TW1L.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_T7TW1L.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM T7TW1L
  INTO TABLE IT_T7TW1L.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM T7TW1L
*  INTO TABLE @DATA(IT_T7TW1L2).
*--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_T7TW1L INDEX 1 INTO DATA(WA_T7TW1L2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_T7TW1L ASSIGNING <T7TW1L>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<T7TW1L>-MANDT = 1.
<T7TW1L>-PERNR = 1.
<T7TW1L>-SUBTY = 1.
<T7TW1L>-OBJPS = 1.
<T7TW1L>-SEQNR = 1.

ENDLOOP.

LOOP AT IT_T7TW1L INTO WA_T7TW1L.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_T7TW1L-INTYP, sy-vline,
  WA_T7TW1L-NAME, sy-vline,
  WA_T7TW1L-GBDAT, sy-vline,
  WA_T7TW1L-IDNUM, sy-vline,
  WA_T7TW1L-STATU, sy-vline,
  WA_T7TW1L-INAMT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_T7TW1L 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_T7TW1L 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_T7TW1L INTO WA_T7TW1L.


*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 PDATE, internal->external for field GBDAT
CALL FUNCTION 'CONVERSION_EXIT_PDATE_OUTPUT'
  EXPORTING
    input =                      WA_T7TW1L-GBDAT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_T7TW1L-GBDAT.
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_T7TW1L_STR, 
MANDT TYPE STRING,
PERNR TYPE STRING,
SUBTY TYPE STRING,
OBJPS TYPE STRING,
SEQNR TYPE STRING,
INTYP TYPE STRING,
NAME TYPE STRING,
GBDAT TYPE STRING,
IDNUM TYPE STRING,
STATU TYPE STRING,
INAMT TYPE STRING,
INCUR TYPE STRING,
STUDT TYPE STRING,
STMDT TYPE STRING,
LEVDT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_T7TW1L_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_T7TW1L_STR-MANDT sy-vline 
WA_T7TW1L_STR-PERNR sy-vline 
WA_T7TW1L_STR-SUBTY sy-vline 
WA_T7TW1L_STR-OBJPS sy-vline 
WA_T7TW1L_STR-SEQNR sy-vline 
WA_T7TW1L_STR-INTYP sy-vline 
WA_T7TW1L_STR-NAME sy-vline 
WA_T7TW1L_STR-GBDAT sy-vline 
WA_T7TW1L_STR-IDNUM sy-vline 
WA_T7TW1L_STR-STATU sy-vline 
WA_T7TW1L_STR-INAMT sy-vline 
WA_T7TW1L_STR-INCUR sy-vline 
WA_T7TW1L_STR-STUDT sy-vline 
WA_T7TW1L_STR-STMDT sy-vline 
WA_T7TW1L_STR-LEVDT sy-vline      INTO ld_text SEPARATED BY SPACE.

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