ABAP Select data from SAP table TXW_VDT_DESC into internal table

Get Example source ABAP code based on a different SAP table
  Get ABAP code

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TXW_VDT_DESC
*  INTO TABLE @DATA(IT_TXW_VDT_DESC2).
*--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_TXW_VDT_DESC INDEX 1 INTO DATA(WA_TXW_VDT_DESC2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TXW_VDT_DESC>-SEGMENT = 1.
<TXW_VDT_DESC>-SEGTYPE = 1.
<TXW_VDT_DESC>-SEGDATA = 1.
<TXW_VDT_DESC>-FIELD_POS = 1.
<TXW_VDT_DESC>-FIELD_OFFS = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TXW_VDT_DESC-FIELDNAME, sy-vline,
  WA_TXW_VDT_DESC-INDEX_ID, sy-vline,
  WA_TXW_VDT_DESC-SEL_FIELD, sy-vline,
  WA_TXW_VDT_DESC-FIELD_TYPE, sy-vline,
  WA_TXW_VDT_DESC-X_CHK_TOT, sy-vline,
  WA_TXW_VDT_DESC-X_CHK_GRP, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TXW_VDT_DESC 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_TXW_VDT_DESC 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_TXW_VDT_DESC INTO WA_TXW_VDT_DESC.


*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 DTYPE, internal->external for field DATATYPE
CALL FUNCTION 'CONVERSION_EXIT_DTYPE_OUTPUT'
  EXPORTING
    input =                      WA_TXW_VDT_DESC-DATATYPE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TXW_VDT_DESC-DATATYPE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ISOLA, internal->external for field LANGU
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_TXW_VDT_DESC-LANGU
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TXW_VDT_DESC-LANGU.
WRITE:/ 'New Value:', ld_input.

*Conversion exit DTYPE, internal->external for field DATATYPE
CALL FUNCTION 'CONVERSION_EXIT_DTYPE_OUTPUT'
  EXPORTING
    input =                      WA_TXW_VDT_DESC-DATATYPE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TXW_VDT_DESC-DATATYPE.
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_TXW_VDT_DESC_STR, 
SEGMENT TYPE STRING,
SEGTYPE TYPE STRING,
SEGDATA TYPE STRING,
FIELD_POS TYPE STRING,
FIELD_OFFS TYPE STRING,
FIELDNAME TYPE STRING,
INDEX_ID TYPE STRING,
SEL_FIELD TYPE STRING,
FIELD_TYPE TYPE STRING,
X_CHK_TOT TYPE STRING,
X_CHK_GRP TYPE STRING,
FIELDTEXT TYPE STRING,
REPTEXT TYPE STRING,
SCRTEXT_M TYPE STRING,
IOBJNM TYPE STRING,
LENG TYPE STRING,
DATATYPE TYPE STRING,
REFFIELD TYPE STRING,
REFSEGTYPE TYPE STRING,
REFSEGDATA TYPE STRING,
REFSEGMENT TYPE STRING,
ORI_TNAME TYPE STRING,
ORI_FNAME TYPE STRING,
DFIESWA TYPE STRING,
TABNAME TYPE STRING,
FIELDNAME TYPE STRING,
LANGU TYPE STRING,
POSITION TYPE STRING,
OFFSET TYPE STRING,
DOMNAME TYPE STRING,
ROLLNAME TYPE STRING,
CHECKTABLE TYPE STRING,
LENG TYPE STRING,
INTLEN TYPE STRING,
OUTPUTLEN TYPE STRING,
DECIMALS TYPE STRING,
DATATYPE TYPE STRING,
INTTYPE TYPE STRING,
REFTABLE TYPE STRING,
REFFIELD TYPE STRING,
PRECFIELD TYPE STRING,
AUTHORID TYPE STRING,
MEMORYID TYPE STRING,
LOGFLAG TYPE STRING,
MASK TYPE STRING,
MASKLEN TYPE STRING,
CONVEXIT TYPE STRING,
HEADLEN TYPE STRING,
SCRLEN1 TYPE STRING,
SCRLEN2 TYPE STRING,
SCRLEN3 TYPE STRING,
FIELDTEXT TYPE STRING,
REPTEXT TYPE STRING,
SCRTEXT_S TYPE STRING,
SCRTEXT_M TYPE STRING,
SCRTEXT_L TYPE STRING,
KEYFLAG TYPE STRING,
LOWERCASE TYPE STRING,
MAC TYPE STRING,
GENKEY TYPE STRING,
NOFORKEY TYPE STRING,
VALEXI TYPE STRING,
NOAUTHCH TYPE STRING,
SIGN TYPE STRING,
DYNPFLD TYPE STRING,
F4AVAILABL TYPE STRING,
COMPTYPE TYPE STRING,
LFIELDNAME TYPE STRING,
LTRFLDDIS TYPE STRING,
BIDICTRLC TYPE STRING,
OUTPUTSTYLE TYPE STRING,
NOHISTORY TYPE STRING,
AMPMFORMAT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TXW_VDT_DESC_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_TXW_VDT_DESC_STR-SEGMENT sy-vline 
WA_TXW_VDT_DESC_STR-SEGTYPE sy-vline 
WA_TXW_VDT_DESC_STR-SEGDATA sy-vline 
WA_TXW_VDT_DESC_STR-FIELD_POS sy-vline 
WA_TXW_VDT_DESC_STR-FIELD_OFFS sy-vline 
WA_TXW_VDT_DESC_STR-FIELDNAME sy-vline 
WA_TXW_VDT_DESC_STR-INDEX_ID sy-vline 
WA_TXW_VDT_DESC_STR-SEL_FIELD sy-vline 
WA_TXW_VDT_DESC_STR-FIELD_TYPE sy-vline 
WA_TXW_VDT_DESC_STR-X_CHK_TOT sy-vline 
WA_TXW_VDT_DESC_STR-X_CHK_GRP sy-vline 
WA_TXW_VDT_DESC_STR-FIELDTEXT sy-vline 
WA_TXW_VDT_DESC_STR-REPTEXT sy-vline 
WA_TXW_VDT_DESC_STR-SCRTEXT_M sy-vline 
WA_TXW_VDT_DESC_STR-IOBJNM sy-vline 
WA_TXW_VDT_DESC_STR-LENG sy-vline 
WA_TXW_VDT_DESC_STR-DATATYPE sy-vline 
WA_TXW_VDT_DESC_STR-REFFIELD sy-vline 
WA_TXW_VDT_DESC_STR-REFSEGTYPE sy-vline 
WA_TXW_VDT_DESC_STR-REFSEGDATA sy-vline 
WA_TXW_VDT_DESC_STR-REFSEGMENT sy-vline 
WA_TXW_VDT_DESC_STR-ORI_TNAME sy-vline 
WA_TXW_VDT_DESC_STR-ORI_FNAME sy-vline 
WA_TXW_VDT_DESC_STR-DFIESWA sy-vline 
WA_TXW_VDT_DESC_STR-TABNAME sy-vline 
WA_TXW_VDT_DESC_STR-FIELDNAME sy-vline 
WA_TXW_VDT_DESC_STR-LANGU sy-vline 
WA_TXW_VDT_DESC_STR-POSITION sy-vline 
WA_TXW_VDT_DESC_STR-OFFSET sy-vline 
WA_TXW_VDT_DESC_STR-DOMNAME sy-vline 
WA_TXW_VDT_DESC_STR-ROLLNAME sy-vline 
WA_TXW_VDT_DESC_STR-CHECKTABLE sy-vline 
WA_TXW_VDT_DESC_STR-LENG sy-vline 
WA_TXW_VDT_DESC_STR-INTLEN sy-vline 
WA_TXW_VDT_DESC_STR-OUTPUTLEN sy-vline 
WA_TXW_VDT_DESC_STR-DECIMALS sy-vline 
WA_TXW_VDT_DESC_STR-DATATYPE sy-vline 
WA_TXW_VDT_DESC_STR-INTTYPE sy-vline 
WA_TXW_VDT_DESC_STR-REFTABLE sy-vline 
WA_TXW_VDT_DESC_STR-REFFIELD sy-vline 
WA_TXW_VDT_DESC_STR-PRECFIELD sy-vline 
WA_TXW_VDT_DESC_STR-AUTHORID sy-vline 
WA_TXW_VDT_DESC_STR-MEMORYID sy-vline 
WA_TXW_VDT_DESC_STR-LOGFLAG sy-vline 
WA_TXW_VDT_DESC_STR-MASK sy-vline 
WA_TXW_VDT_DESC_STR-MASKLEN sy-vline 
WA_TXW_VDT_DESC_STR-CONVEXIT sy-vline 
WA_TXW_VDT_DESC_STR-HEADLEN sy-vline 
WA_TXW_VDT_DESC_STR-SCRLEN1 sy-vline 
WA_TXW_VDT_DESC_STR-SCRLEN2 sy-vline 
WA_TXW_VDT_DESC_STR-SCRLEN3 sy-vline 
WA_TXW_VDT_DESC_STR-FIELDTEXT sy-vline 
WA_TXW_VDT_DESC_STR-REPTEXT sy-vline 
WA_TXW_VDT_DESC_STR-SCRTEXT_S sy-vline 
WA_TXW_VDT_DESC_STR-SCRTEXT_M sy-vline 
WA_TXW_VDT_DESC_STR-SCRTEXT_L sy-vline 
WA_TXW_VDT_DESC_STR-KEYFLAG sy-vline 
WA_TXW_VDT_DESC_STR-LOWERCASE sy-vline 
WA_TXW_VDT_DESC_STR-MAC sy-vline 
WA_TXW_VDT_DESC_STR-GENKEY sy-vline 
WA_TXW_VDT_DESC_STR-NOFORKEY sy-vline 
WA_TXW_VDT_DESC_STR-VALEXI sy-vline 
WA_TXW_VDT_DESC_STR-NOAUTHCH sy-vline 
WA_TXW_VDT_DESC_STR-SIGN sy-vline 
WA_TXW_VDT_DESC_STR-DYNPFLD sy-vline 
WA_TXW_VDT_DESC_STR-F4AVAILABL sy-vline 
WA_TXW_VDT_DESC_STR-COMPTYPE sy-vline 
WA_TXW_VDT_DESC_STR-LFIELDNAME sy-vline 
WA_TXW_VDT_DESC_STR-LTRFLDDIS sy-vline 
WA_TXW_VDT_DESC_STR-BIDICTRLC sy-vline 
WA_TXW_VDT_DESC_STR-OUTPUTSTYLE sy-vline 
WA_TXW_VDT_DESC_STR-NOHISTORY sy-vline 
WA_TXW_VDT_DESC_STR-AMPMFORMAT sy-vline      INTO ld_text SEPARATED BY SPACE.

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