ABAP Select data from SAP table CLX2V into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP CLX2V 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 CLX2V. 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 CLX2V 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_CLX2V TYPE STANDARD TABLE OF CLX2V,
      WA_CLX2V TYPE CLX2V,
      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: <CLX2V> TYPE CLX2V.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_CLX2V.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM CLX2V
  INTO TABLE IT_CLX2V.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CLX2V
*  INTO TABLE @DATA(IT_CLX2V2).
*--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_CLX2V INDEX 1 INTO DATA(WA_CLX2V2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_CLX2V ASSIGNING <CLX2V>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CLX2V>-ATINN = 1.
<CLX2V>-ATWRT = 1.
<CLX2V>-ATWTB = 1.
<CLX2V>-ATFLV = 1.
<CLX2V>-ATFLB = 1.

ENDLOOP.

LOOP AT IT_CLX2V INTO WA_CLX2V.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CLX2V-ATAWE, sy-vline,
  WA_CLX2V-ATAW1, sy-vline,
  WA_CLX2V-DOKAR, sy-vline,
  WA_CLX2V-DOKNR, sy-vline,
  WA_CLX2V-DOKVR, sy-vline,
  WA_CLX2V-DOKTL, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CLX2V 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_CLX2V 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_CLX2V INTO WA_CLX2V.


*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 ATINN, internal->external for field ATINN
CALL FUNCTION 'CONVERSION_EXIT_ATINN_OUTPUT'
  EXPORTING
    input =                      WA_CLX2V-ATINN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CLX2V-ATINN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field ATAWE
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_CLX2V-ATAWE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CLX2V-ATAWE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field ATAW1
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_CLX2V-ATAW1
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CLX2V-ATAW1.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field DOKNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_CLX2V-DOKNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CLX2V-DOKNR.
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_CLX2V_STR, 
ATINN TYPE STRING,
ATWRT TYPE STRING,
ATWTB TYPE STRING,
ATFLV TYPE STRING,
ATFLB TYPE STRING,
ATAWE TYPE STRING,
ATAW1 TYPE STRING,
DOKAR TYPE STRING,
DOKNR TYPE STRING,
DOKVR TYPE STRING,
DOKTL TYPE STRING,
KNOBJ TYPE STRING,
ATSTD TYPE STRING,
ATWHI TYPE STRING,
ATZHH TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CLX2V_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_CLX2V_STR-ATINN sy-vline 
WA_CLX2V_STR-ATWRT sy-vline 
WA_CLX2V_STR-ATWTB sy-vline 
WA_CLX2V_STR-ATFLV sy-vline 
WA_CLX2V_STR-ATFLB sy-vline 
WA_CLX2V_STR-ATAWE sy-vline 
WA_CLX2V_STR-ATAW1 sy-vline 
WA_CLX2V_STR-DOKAR sy-vline 
WA_CLX2V_STR-DOKNR sy-vline 
WA_CLX2V_STR-DOKVR sy-vline 
WA_CLX2V_STR-DOKTL sy-vline 
WA_CLX2V_STR-KNOBJ sy-vline 
WA_CLX2V_STR-ATSTD sy-vline 
WA_CLX2V_STR-ATWHI sy-vline 
WA_CLX2V_STR-ATZHH sy-vline      INTO ld_text SEPARATED BY SPACE.

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