ABAP Select data from SAP table V_TWIC0400N into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP V_TWIC0400N 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 V_TWIC0400N. 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 V_TWIC0400N 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_V_TWIC0400N TYPE STANDARD TABLE OF V_TWIC0400N,
      WA_V_TWIC0400N TYPE V_TWIC0400N,
      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: <V_TWIC0400N> TYPE V_TWIC0400N.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_V_TWIC0400N.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM V_TWIC0400N
  INTO TABLE IT_V_TWIC0400N.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM V_TWIC0400N
*  INTO TABLE @DATA(IT_V_TWIC0400N2).
*--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_V_TWIC0400N INDEX 1 INTO DATA(WA_V_TWIC0400N2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_V_TWIC0400N ASSIGNING <V_TWIC0400N>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<V_TWIC0400N>-MANDT = 1.
<V_TWIC0400N>-CSTOBJ = 1.
<V_TWIC0400N>-CSTSCM = 1.
<V_TWIC0400N>-TEXT = 1.
<V_TWIC0400N>-FLAG_STRD = 1.

ENDLOOP.

LOOP AT IT_V_TWIC0400N INTO WA_V_TWIC0400N.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_V_TWIC0400N-MATID, sy-vline,
  WA_V_TWIC0400N-DOC_CANC_ALLOWED, sy-vline,
  WA_V_TWIC0400N-CALC_TAX_ALWAYS, sy-vline,
  WA_V_TWIC0400N-SKIP_PRNT_SCREEN, sy-vline,
  WA_V_TWIC0400N-COST_LI_WITH_REF, sy-vline,
  WA_V_TWIC0400N-COST_LI_WO_REF, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_V_TWIC0400N 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_V_TWIC0400N 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_V_TWIC0400N INTO WA_V_TWIC0400N.


*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_V_TWIC0400N_STR, 
MANDT TYPE STRING,
CSTOBJ TYPE STRING,
CSTSCM TYPE STRING,
TEXT TYPE STRING,
FLAG_STRD TYPE STRING,
MATID TYPE STRING,
DOC_CANC_ALLOWED TYPE STRING,
CALC_TAX_ALWAYS TYPE STRING,
SKIP_PRNT_SCREEN TYPE STRING,
COST_LI_WITH_REF TYPE STRING,
COST_LI_WO_REF TYPE STRING,
SC_HEAD_PST_DATE TYPE STRING,
SC_ITEM_QUANTITY TYPE STRING,
SC_ITEM_IS_VALID TYPE STRING,
DOCSRC_DAYS_BACK TYPE STRING,
DOCSRC_LINES_MAX TYPE STRING,
PO_SRC_DAYS_BACK TYPE STRING,
GM_SRC_DAYS_BACK TYPE STRING,
TOL_POS_CHECK TYPE STRING,
TOL_POS_VALUE TYPE STRING,
TOL_NEG_CHECK TYPE STRING,
TOL_NEG_VALUE TYPE STRING,
TOL_CURR TYPE STRING,
HOLD_ACTION TYPE STRING,
TOL_PMNT_BLOCK TYPE STRING,
TOL_HOLD_ACTION TYPE STRING,
HOLD_PMNT_BLOCK TYPE STRING,
PMNT_DLG_ACTIVE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_V_TWIC0400N_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_V_TWIC0400N_STR-MANDT sy-vline 
WA_V_TWIC0400N_STR-CSTOBJ sy-vline 
WA_V_TWIC0400N_STR-CSTSCM sy-vline 
WA_V_TWIC0400N_STR-TEXT sy-vline 
WA_V_TWIC0400N_STR-FLAG_STRD sy-vline 
WA_V_TWIC0400N_STR-MATID sy-vline 
WA_V_TWIC0400N_STR-DOC_CANC_ALLOWED sy-vline 
WA_V_TWIC0400N_STR-CALC_TAX_ALWAYS sy-vline 
WA_V_TWIC0400N_STR-SKIP_PRNT_SCREEN sy-vline 
WA_V_TWIC0400N_STR-COST_LI_WITH_REF sy-vline 
WA_V_TWIC0400N_STR-COST_LI_WO_REF sy-vline 
WA_V_TWIC0400N_STR-SC_HEAD_PST_DATE sy-vline 
WA_V_TWIC0400N_STR-SC_ITEM_QUANTITY sy-vline 
WA_V_TWIC0400N_STR-SC_ITEM_IS_VALID sy-vline 
WA_V_TWIC0400N_STR-DOCSRC_DAYS_BACK sy-vline 
WA_V_TWIC0400N_STR-DOCSRC_LINES_MAX sy-vline 
WA_V_TWIC0400N_STR-PO_SRC_DAYS_BACK sy-vline 
WA_V_TWIC0400N_STR-GM_SRC_DAYS_BACK sy-vline 
WA_V_TWIC0400N_STR-TOL_POS_CHECK sy-vline 
WA_V_TWIC0400N_STR-TOL_POS_VALUE sy-vline 
WA_V_TWIC0400N_STR-TOL_NEG_CHECK sy-vline 
WA_V_TWIC0400N_STR-TOL_NEG_VALUE sy-vline 
WA_V_TWIC0400N_STR-TOL_CURR sy-vline 
WA_V_TWIC0400N_STR-HOLD_ACTION sy-vline 
WA_V_TWIC0400N_STR-TOL_PMNT_BLOCK sy-vline 
WA_V_TWIC0400N_STR-TOL_HOLD_ACTION sy-vline 
WA_V_TWIC0400N_STR-HOLD_PMNT_BLOCK sy-vline 
WA_V_TWIC0400N_STR-PMNT_DLG_ACTIVE sy-vline      INTO ld_text SEPARATED BY SPACE.

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