ABAP Select data from SAP table DOC_COLL into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DOC_COLL
*  INTO TABLE @DATA(IT_DOC_COLL2).
*--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_DOC_COLL INDEX 1 INTO DATA(WA_DOC_COLL2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DOC_COLL>-BUKRS = 1.
<DOC_COLL>-GJAHR = 1.
<DOC_COLL>-BELNR = 1.
<DOC_COLL>-BLART = 1.
<DOC_COLL>-LTEXT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DOC_COLL-CPUDT, sy-vline,
  WA_DOC_COLL-CPUTM, sy-vline,
  WA_DOC_COLL-TCODE, sy-vline,
  WA_DOC_COLL-BVORG, sy-vline,
  WA_DOC_COLL-AWTYP, sy-vline,
  WA_DOC_COLL-AWKEY, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DOC_COLL 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_DOC_COLL 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_DOC_COLL INTO WA_DOC_COLL.


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

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

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

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

*Conversion exit ALPHA, internal->external for field TEMP_CASHBELNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_DOC_COLL-TEMP_CASHBELNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DOC_COLL-TEMP_CASHBELNR.
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_DOC_COLL_STR, 
BUKRS TYPE STRING,
GJAHR TYPE STRING,
BELNR TYPE STRING,
BLART TYPE STRING,
LTEXT TYPE STRING,
CPUDT TYPE STRING,
CPUTM TYPE STRING,
TCODE TYPE STRING,
BVORG TYPE STRING,
AWTYP TYPE STRING,
AWKEY TYPE STRING,
AWSYS TYPE STRING,
KOKRS TYPE STRING,
CASHBELNR TYPE STRING,
TEMP_CASHBELNR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DOC_COLL_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_DOC_COLL_STR-BUKRS sy-vline 
WA_DOC_COLL_STR-GJAHR sy-vline 
WA_DOC_COLL_STR-BELNR sy-vline 
WA_DOC_COLL_STR-BLART sy-vline 
WA_DOC_COLL_STR-LTEXT sy-vline 
WA_DOC_COLL_STR-CPUDT sy-vline 
WA_DOC_COLL_STR-CPUTM sy-vline 
WA_DOC_COLL_STR-TCODE sy-vline 
WA_DOC_COLL_STR-BVORG sy-vline 
WA_DOC_COLL_STR-AWTYP sy-vline 
WA_DOC_COLL_STR-AWKEY sy-vline 
WA_DOC_COLL_STR-AWSYS sy-vline 
WA_DOC_COLL_STR-KOKRS sy-vline 
WA_DOC_COLL_STR-CASHBELNR sy-vline 
WA_DOC_COLL_STR-TEMP_CASHBELNR sy-vline      INTO ld_text SEPARATED BY SPACE.

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