ABAP Select data from SAP table T7SIWA into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP T7SIWA 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 T7SIWA. 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 T7SIWA 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_T7SIWA TYPE STANDARD TABLE OF T7SIWA,
      WA_T7SIWA TYPE T7SIWA,
      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: <T7SIWA> TYPE T7SIWA.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_T7SIWA.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM T7SIWA
  INTO TABLE IT_T7SIWA.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM T7SIWA
*  INTO TABLE @DATA(IT_T7SIWA2).
*--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_T7SIWA INDEX 1 INTO DATA(WA_T7SIWA2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_T7SIWA ASSIGNING <T7SIWA>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<T7SIWA>-MANDT = 1.
<T7SIWA>-GRAG1 = 1.
<T7SIWA>-GRAG2 = 1.
<T7SIWA>-LGART = 1.
<T7SIWA>-DURTY = 1.

ENDLOOP.

LOOP AT IT_T7SIWA INTO WA_T7SIWA.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_T7SIWA-GENDE, sy-vline,
  WA_T7SIWA-YRSLO, sy-vline,
  WA_T7SIWA-YRSHI, sy-vline,
  WA_T7SIWA-ENDDA, sy-vline,
  WA_T7SIWA-BEGDA, sy-vline,
  WA_T7SIWA-WARES, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_T7SIWA 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_T7SIWA 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_T7SIWA INTO WA_T7SIWA.


*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_T7SIWA_STR, 
MANDT TYPE STRING,
GRAG1 TYPE STRING,
GRAG2 TYPE STRING,
LGART TYPE STRING,
DURTY TYPE STRING,
GENDE TYPE STRING,
YRSLO TYPE STRING,
YRSHI TYPE STRING,
ENDDA TYPE STRING,
BEGDA TYPE STRING,
WARES TYPE STRING,END OF T_EKKO_STR.
DATA: WA_T7SIWA_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_T7SIWA_STR-MANDT sy-vline 
WA_T7SIWA_STR-GRAG1 sy-vline 
WA_T7SIWA_STR-GRAG2 sy-vline 
WA_T7SIWA_STR-LGART sy-vline 
WA_T7SIWA_STR-DURTY sy-vline 
WA_T7SIWA_STR-GENDE sy-vline 
WA_T7SIWA_STR-YRSLO sy-vline 
WA_T7SIWA_STR-YRSHI sy-vline 
WA_T7SIWA_STR-ENDDA sy-vline 
WA_T7SIWA_STR-BEGDA sy-vline 
WA_T7SIWA_STR-WARES sy-vline      INTO ld_text SEPARATED BY SPACE.

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