ABAP Select data from SAP table CAULW into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CAULW
*  INTO TABLE @DATA(IT_CAULW2).
*--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_CAULW INDEX 1 INTO DATA(WA_CAULW2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CAULW>-MANDT = 1.
<CAULW>-ABELN = 1.
<CAULW>-ABELP = 1.
<CAULW>-ABELG = 1.
<CAULW>-ABELF = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CAULW-LWNUM, sy-vline,
  WA_CAULW-WEDAT, sy-vline,
  WA_CAULW-WETYP, sy-vline,
  WA_CAULW-WEUZT, sy-vline,
  WA_CAULW-WEPRZ, sy-vline,
  WA_CAULW-MENGE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CAULW 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_CAULW 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_CAULW INTO WA_CAULW.


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

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

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

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

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

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

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

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

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

*Conversion exit ALPHA, internal->external for field VBELN_GKA
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_CAULW-VBELN_GKA
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CAULW-VBELN_GKA.
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_CAULW_STR, 
MANDT TYPE STRING,
ABELN TYPE STRING,
ABELP TYPE STRING,
ABELG TYPE STRING,
ABELF TYPE STRING,
LWNUM TYPE STRING,
WEDAT TYPE STRING,
WETYP TYPE STRING,
WEUZT TYPE STRING,
WEPRZ TYPE STRING,
MENGE TYPE STRING,
AUFME TYPE STRING,
WEMNG TYPE STRING,
MBLNR TYPE STRING,
MBLPO TYPE STRING,
LFMNG TYPE STRING,
VRKME TYPE STRING,
LEDAT TYPE STRING,
VBLNU TYPE STRING,
VBLPU TYPE STRING,
BEDAT TYPE STRING,
BSTMG TYPE STRING,
BSTME TYPE STRING,
EBLNU TYPE STRING,
EBLPU TYPE STRING,
UMDAT TYPE STRING,
UMLMG TYPE STRING,
UMLME TYPE STRING,
UBSTN TYPE STRING,
UBSTP TYPE STRING,
ELIKZ TYPE STRING,
IMNGL TYPE STRING,
WMNGE TYPE STRING,
VBELN_GKA TYPE STRING,
VBELP_GKA TYPE STRING,
WRF_AT_DL_ID TYPE STRING,
KZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CAULW_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_CAULW_STR-MANDT sy-vline 
WA_CAULW_STR-ABELN sy-vline 
WA_CAULW_STR-ABELP sy-vline 
WA_CAULW_STR-ABELG sy-vline 
WA_CAULW_STR-ABELF sy-vline 
WA_CAULW_STR-LWNUM sy-vline 
WA_CAULW_STR-WEDAT sy-vline 
WA_CAULW_STR-WETYP sy-vline 
WA_CAULW_STR-WEUZT sy-vline 
WA_CAULW_STR-WEPRZ sy-vline 
WA_CAULW_STR-MENGE sy-vline 
WA_CAULW_STR-AUFME sy-vline 
WA_CAULW_STR-WEMNG sy-vline 
WA_CAULW_STR-MBLNR sy-vline 
WA_CAULW_STR-MBLPO sy-vline 
WA_CAULW_STR-LFMNG sy-vline 
WA_CAULW_STR-VRKME sy-vline 
WA_CAULW_STR-LEDAT sy-vline 
WA_CAULW_STR-VBLNU sy-vline 
WA_CAULW_STR-VBLPU sy-vline 
WA_CAULW_STR-BEDAT sy-vline 
WA_CAULW_STR-BSTMG sy-vline 
WA_CAULW_STR-BSTME sy-vline 
WA_CAULW_STR-EBLNU sy-vline 
WA_CAULW_STR-EBLPU sy-vline 
WA_CAULW_STR-UMDAT sy-vline 
WA_CAULW_STR-UMLMG sy-vline 
WA_CAULW_STR-UMLME sy-vline 
WA_CAULW_STR-UBSTN sy-vline 
WA_CAULW_STR-UBSTP sy-vline 
WA_CAULW_STR-ELIKZ sy-vline 
WA_CAULW_STR-IMNGL sy-vline 
WA_CAULW_STR-WMNGE sy-vline 
WA_CAULW_STR-VBELN_GKA sy-vline 
WA_CAULW_STR-VBELP_GKA sy-vline 
WA_CAULW_STR-WRF_AT_DL_ID sy-vline 
WA_CAULW_STR-KZ sy-vline      INTO ld_text SEPARATED BY SPACE.

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