ABAP Select data from SAP table COAS_BUF into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM COAS_BUF
*  INTO TABLE @DATA(IT_COAS_BUF2).
*--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_COAS_BUF INDEX 1 INTO DATA(WA_COAS_BUF2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<COAS_BUF>-AUFNR = 1.
<COAS_BUF>-KOKRS = 1.
<COAS_BUF>-OBJNR = 1.
<COAS_BUF>-AUTYP = 1.
<COAS_BUF>-AUART = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_COAS_BUF-ASTNR, sy-vline,
  WA_COAS_BUF-KOSTV, sy-vline,
  WA_COAS_BUF-PSPEL, sy-vline,
  WA_COAS_BUF-WAERS, sy-vline,
  WA_COAS_BUF-KTEXT, sy-vline,
ENDLOOP.
   
*Add any further fields from structure WA_COAS_BUF 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_COAS_BUF 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_COAS_BUF INTO WA_COAS_BUF.


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

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

*Conversion exit ABPSP, internal->external for field PSPEL
CALL FUNCTION 'CONVERSION_EXIT_ABPSP_OUTPUT'
  EXPORTING
    input =                      WA_COAS_BUF-PSPEL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_COAS_BUF-PSPEL.
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_COAS_BUF_STR, 
AUFNR TYPE STRING,
KOKRS TYPE STRING,
OBJNR TYPE STRING,
AUTYP TYPE STRING,
AUART TYPE STRING,
ASTNR TYPE STRING,
KOSTV TYPE STRING,
PSPEL TYPE STRING,
WAERS TYPE STRING,
KTEXT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_COAS_BUF_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_COAS_BUF_STR-AUFNR sy-vline 
WA_COAS_BUF_STR-KOKRS sy-vline 
WA_COAS_BUF_STR-OBJNR sy-vline 
WA_COAS_BUF_STR-AUTYP sy-vline 
WA_COAS_BUF_STR-AUART sy-vline 
WA_COAS_BUF_STR-ASTNR sy-vline 
WA_COAS_BUF_STR-KOSTV sy-vline 
WA_COAS_BUF_STR-PSPEL sy-vline 
WA_COAS_BUF_STR-WAERS sy-vline 
WA_COAS_BUF_STR-KTEXT sy-vline      INTO ld_text SEPARATED BY SPACE.

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