ABAP Select data from SAP table TXW_CO2HD into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP TXW_CO2HD 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_CO2HD. 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_CO2HD 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_CO2HD TYPE STANDARD TABLE OF TXW_CO2HD,
      WA_TXW_CO2HD TYPE TXW_CO2HD,
      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_CO2HD> TYPE TXW_CO2HD.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_TXW_CO2HD.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM TXW_CO2HD
  INTO TABLE IT_TXW_CO2HD.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TXW_CO2HD
*  INTO TABLE @DATA(IT_TXW_CO2HD2).
*--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_CO2HD INDEX 1 INTO DATA(WA_TXW_CO2HD2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_TXW_CO2HD ASSIGNING <TXW_CO2HD>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TXW_CO2HD>-MANDT = 1.
<TXW_CO2HD>-KOKRS = 1.
<TXW_CO2HD>-BELNR = 1.
<TXW_CO2HD>-GJAHR = 1.
<TXW_CO2HD>-PERIO = 1.

ENDLOOP.

LOOP AT IT_TXW_CO2HD INTO WA_TXW_CO2HD.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TXW_CO2HD-VRGNG, sy-vline,
  WA_TXW_CO2HD-BLDAT, sy-vline,
  WA_TXW_CO2HD-BUDAT, sy-vline,
  WA_TXW_CO2HD-REFBT, sy-vline,
  WA_TXW_CO2HD-REFBN, sy-vline,
  WA_TXW_CO2HD-REFBK, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TXW_CO2HD 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_CO2HD 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_CO2HD INTO WA_TXW_CO2HD.


*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 BELNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_TXW_CO2HD-BELNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TXW_CO2HD-BELNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GJAHR, internal->external for field GJAHR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_TXW_CO2HD-GJAHR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TXW_CO2HD-GJAHR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field REFBN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_TXW_CO2HD-REFBN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TXW_CO2HD-REFBN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GJAHR, internal->external for field REFGJ
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_TXW_CO2HD-REFGJ
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TXW_CO2HD-REFGJ.
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_CO2HD_STR, 
MANDT TYPE STRING,
KOKRS TYPE STRING,
BELNR TYPE STRING,
GJAHR TYPE STRING,
PERIO TYPE STRING,
VRGNG TYPE STRING,
BLDAT TYPE STRING,
BUDAT TYPE STRING,
REFBT TYPE STRING,
REFBN TYPE STRING,
REFBK TYPE STRING,
REFGJ TYPE STRING,
BLART TYPE STRING,
DELBZ TYPE STRING,
ORGVG TYPE STRING,
PERAB TYPE STRING,
PERBI TYPE STRING,
SUMBZ TYPE STRING,
KWAER TYPE STRING,
BLTXT TYPE STRING,
AWORG TYPE STRING,
AWTYP TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TXW_CO2HD_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_CO2HD_STR-MANDT sy-vline 
WA_TXW_CO2HD_STR-KOKRS sy-vline 
WA_TXW_CO2HD_STR-BELNR sy-vline 
WA_TXW_CO2HD_STR-GJAHR sy-vline 
WA_TXW_CO2HD_STR-PERIO sy-vline 
WA_TXW_CO2HD_STR-VRGNG sy-vline 
WA_TXW_CO2HD_STR-BLDAT sy-vline 
WA_TXW_CO2HD_STR-BUDAT sy-vline 
WA_TXW_CO2HD_STR-REFBT sy-vline 
WA_TXW_CO2HD_STR-REFBN sy-vline 
WA_TXW_CO2HD_STR-REFBK sy-vline 
WA_TXW_CO2HD_STR-REFGJ sy-vline 
WA_TXW_CO2HD_STR-BLART sy-vline 
WA_TXW_CO2HD_STR-DELBZ sy-vline 
WA_TXW_CO2HD_STR-ORGVG sy-vline 
WA_TXW_CO2HD_STR-PERAB sy-vline 
WA_TXW_CO2HD_STR-PERBI sy-vline 
WA_TXW_CO2HD_STR-SUMBZ sy-vline 
WA_TXW_CO2HD_STR-KWAER sy-vline 
WA_TXW_CO2HD_STR-BLTXT sy-vline 
WA_TXW_CO2HD_STR-AWORG sy-vline 
WA_TXW_CO2HD_STR-AWTYP sy-vline      INTO ld_text SEPARATED BY SPACE.

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