ABAP Select data from SAP table TXW_CD_GEN into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP TXW_CD_GEN 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_CD_GEN. 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_CD_GEN 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_CD_GEN TYPE STANDARD TABLE OF TXW_CD_GEN,
      WA_TXW_CD_GEN TYPE TXW_CD_GEN,
      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_CD_GEN> TYPE TXW_CD_GEN.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TXW_CD_GEN
*  INTO TABLE @DATA(IT_TXW_CD_GEN2).
*--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_CD_GEN INDEX 1 INTO DATA(WA_TXW_CD_GEN2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TXW_CD_GEN>-CHANGENR = 1.
<TXW_CD_GEN>-USERNAME = 1.
<TXW_CD_GEN>-UDATE = 1.
<TXW_CD_GEN>-UTIME = 1.
<TXW_CD_GEN>-TCODE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TXW_CD_GEN-TABNAME, sy-vline,
  WA_TXW_CD_GEN-CHNGIND, sy-vline,
  WA_TXW_CD_GEN-FNAME, sy-vline,
  WA_TXW_CD_GEN-FTEXT, sy-vline,
  WA_TXW_CD_GEN-LANGU, sy-vline,
  WA_TXW_CD_GEN-TEXT_CASE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TXW_CD_GEN 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_CD_GEN 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_CD_GEN INTO WA_TXW_CD_GEN.


*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 ALPHA, internal->external for field CHANGENR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_TXW_CD_GEN-CHANGENR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TXW_CD_GEN-CHANGENR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ISOLA, internal->external for field LANGU
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_TXW_CD_GEN-LANGU
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TXW_CD_GEN-LANGU.
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_CD_GEN_STR, 
CHANGENR TYPE STRING,
USERNAME TYPE STRING,
UDATE TYPE STRING,
UTIME TYPE STRING,
TCODE TYPE STRING,
TABNAME TYPE STRING,
CHNGIND TYPE STRING,
FNAME TYPE STRING,
FTEXT TYPE STRING,
LANGU TYPE STRING,
TEXT_CASE TYPE STRING,
OUTLEN TYPE STRING,
VALUE_OLD TYPE STRING,
VALUE_NEW TYPE STRING,
TABKEY TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TXW_CD_GEN_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_CD_GEN_STR-CHANGENR sy-vline 
WA_TXW_CD_GEN_STR-USERNAME sy-vline 
WA_TXW_CD_GEN_STR-UDATE sy-vline 
WA_TXW_CD_GEN_STR-UTIME sy-vline 
WA_TXW_CD_GEN_STR-TCODE sy-vline 
WA_TXW_CD_GEN_STR-TABNAME sy-vline 
WA_TXW_CD_GEN_STR-CHNGIND sy-vline 
WA_TXW_CD_GEN_STR-FNAME sy-vline 
WA_TXW_CD_GEN_STR-FTEXT sy-vline 
WA_TXW_CD_GEN_STR-LANGU sy-vline 
WA_TXW_CD_GEN_STR-TEXT_CASE sy-vline 
WA_TXW_CD_GEN_STR-OUTLEN sy-vline 
WA_TXW_CD_GEN_STR-VALUE_OLD sy-vline 
WA_TXW_CD_GEN_STR-VALUE_NEW sy-vline 
WA_TXW_CD_GEN_STR-TABKEY sy-vline      INTO ld_text SEPARATED BY SPACE.

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