ABAP Select data from SAP table V_TCNDB into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP V_TCNDB 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_TCNDB. 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_TCNDB 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_TCNDB TYPE STANDARD TABLE OF V_TCNDB,
      WA_V_TCNDB TYPE V_TCNDB,
      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_TCNDB> TYPE V_TCNDB.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM V_TCNDB
*  INTO TABLE @DATA(IT_V_TCNDB2).
*--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_TCNDB INDEX 1 INTO DATA(WA_V_TCNDB2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<V_TCNDB>-MANDT = 1.
<V_TCNDB>-PROFID = 1.
<V_TCNDB>-AENAM = 1.
<V_TCNDB>-PROTECT = 1.
<V_TCNDB>-CUSTOM = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_V_TCNDB-SDOR, sy-vline,
  WA_V_TCNDB-PROJ, sy-vline,
  WA_V_TCNDB-PRPS, sy-vline,
  WA_V_TCNDB-HIEKZ, sy-vline,
  WA_V_TCNDB-SUBPRKZ, sy-vline,
  WA_V_TCNDB-SUBPR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_V_TCNDB 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_TCNDB 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_TCNDB INTO WA_V_TCNDB.


*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_TCNDB_STR, 
MANDT TYPE STRING,
PROFID TYPE STRING,
AENAM TYPE STRING,
PROTECT TYPE STRING,
CUSTOM TYPE STRING,
SDOR TYPE STRING,
PROJ TYPE STRING,
PRPS TYPE STRING,
HIEKZ TYPE STRING,
SUBPRKZ TYPE STRING,
SUBPR TYPE STRING,
PLAF TYPE STRING,
NETZ_PSP TYPE STRING,
NETZ TYPE STRING,
ACT_PSP TYPE STRING,
ACT TYPE STRING,
AOB TYPE STRING,
AOBKZ TYPE STRING,
MLST TYPE STRING,
PSTX TYPE STRING,
FHM TYPE STRING,
KAPA TYPE STRING,
KOMP TYPE STRING,
CONF TYPE STRING,
EVA TYPE STRING,
COST TYPE STRING,
EBL TYPE STRING,
MAXLEVEL TYPE STRING,
VARIANTE TYPE STRING,
DB_VIEW TYPE STRING,
VSNUMMER TYPE STRING,
VSGRUPPE TYPE STRING,
KTEXT TYPE STRING,
PFAD_OBEN TYPE STRING,
COREP TYPE STRING,
SHOW_VERS TYPE STRING,
SHOW_ARCH TYPE STRING,
SHOW_STD TYPE STRING,
INCNT TYPE STRING,
INCVG TYPE STRING,
INCIH TYPE STRING,
INCIHVG TYPE STRING,
INCOR TYPE STRING,
INCORVG TYPE STRING,
INCIHSUB TYPE STRING,
INCCO TYPE STRING,
INCPP TYPE STRING,
INCPPVG TYPE STRING,
INCTN TYPE STRING,
HIE_DYN TYPE STRING,
QUANT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_V_TCNDB_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_TCNDB_STR-MANDT sy-vline 
WA_V_TCNDB_STR-PROFID sy-vline 
WA_V_TCNDB_STR-AENAM sy-vline 
WA_V_TCNDB_STR-PROTECT sy-vline 
WA_V_TCNDB_STR-CUSTOM sy-vline 
WA_V_TCNDB_STR-SDOR sy-vline 
WA_V_TCNDB_STR-PROJ sy-vline 
WA_V_TCNDB_STR-PRPS sy-vline 
WA_V_TCNDB_STR-HIEKZ sy-vline 
WA_V_TCNDB_STR-SUBPRKZ sy-vline 
WA_V_TCNDB_STR-SUBPR sy-vline 
WA_V_TCNDB_STR-PLAF sy-vline 
WA_V_TCNDB_STR-NETZ_PSP sy-vline 
WA_V_TCNDB_STR-NETZ sy-vline 
WA_V_TCNDB_STR-ACT_PSP sy-vline 
WA_V_TCNDB_STR-ACT sy-vline 
WA_V_TCNDB_STR-AOB sy-vline 
WA_V_TCNDB_STR-AOBKZ sy-vline 
WA_V_TCNDB_STR-MLST sy-vline 
WA_V_TCNDB_STR-PSTX sy-vline 
WA_V_TCNDB_STR-FHM sy-vline 
WA_V_TCNDB_STR-KAPA sy-vline 
WA_V_TCNDB_STR-KOMP sy-vline 
WA_V_TCNDB_STR-CONF sy-vline 
WA_V_TCNDB_STR-EVA sy-vline 
WA_V_TCNDB_STR-COST sy-vline 
WA_V_TCNDB_STR-EBL sy-vline 
WA_V_TCNDB_STR-MAXLEVEL sy-vline 
WA_V_TCNDB_STR-VARIANTE sy-vline 
WA_V_TCNDB_STR-DB_VIEW sy-vline 
WA_V_TCNDB_STR-VSNUMMER sy-vline 
WA_V_TCNDB_STR-VSGRUPPE sy-vline 
WA_V_TCNDB_STR-KTEXT sy-vline 
WA_V_TCNDB_STR-PFAD_OBEN sy-vline 
WA_V_TCNDB_STR-COREP sy-vline 
WA_V_TCNDB_STR-SHOW_VERS sy-vline 
WA_V_TCNDB_STR-SHOW_ARCH sy-vline 
WA_V_TCNDB_STR-SHOW_STD sy-vline 
WA_V_TCNDB_STR-INCNT sy-vline 
WA_V_TCNDB_STR-INCVG sy-vline 
WA_V_TCNDB_STR-INCIH sy-vline 
WA_V_TCNDB_STR-INCIHVG sy-vline 
WA_V_TCNDB_STR-INCOR sy-vline 
WA_V_TCNDB_STR-INCORVG sy-vline 
WA_V_TCNDB_STR-INCIHSUB sy-vline 
WA_V_TCNDB_STR-INCCO sy-vline 
WA_V_TCNDB_STR-INCPP sy-vline 
WA_V_TCNDB_STR-INCPPVG sy-vline 
WA_V_TCNDB_STR-INCTN sy-vline 
WA_V_TCNDB_STR-HIE_DYN sy-vline 
WA_V_TCNDB_STR-QUANT sy-vline      INTO ld_text SEPARATED BY SPACE.

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