ABAP Select data from SAP table CNV_20306_TKA00C into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP CNV_20306_TKA00C 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 CNV_20306_TKA00C. 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 CNV_20306_TKA00C 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_CNV_20306_TKA00C TYPE STANDARD TABLE OF CNV_20306_TKA00C,
      WA_CNV_20306_TKA00C TYPE CNV_20306_TKA00C,
      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: <CNV_20306_TKA00C> TYPE CNV_20306_TKA00C.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_CNV_20306_TKA00C.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM CNV_20306_TKA00C
  INTO TABLE IT_CNV_20306_TKA00C.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CNV_20306_TKA00C
*  INTO TABLE @DATA(IT_CNV_20306_TKA00C2).
*--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_CNV_20306_TKA00C INDEX 1 INTO DATA(WA_CNV_20306_TKA00C2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_CNV_20306_TKA00C ASSIGNING <CNV_20306_TKA00C>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CNV_20306_TKA00C>-MANDT = 1.
<CNV_20306_TKA00C>-KOKRS = 1.
<CNV_20306_TKA00C>-GJAHR = 1.
<CNV_20306_TKA00C>-KOSTS = 1.
<CNV_20306_TKA00C>-AUFTR = 1.

ENDLOOP.

LOOP AT IT_CNV_20306_TKA00C INTO WA_CNV_20306_TKA00C.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CNV_20306_TKA00C-PRJKT, sy-vline,
  WA_CNV_20306_TKA00C-ERGBR, sy-vline,
  WA_CNV_20306_TKA00C-KKALK, sy-vline,
  WA_CNV_20306_TKA00C-HHPLN, sy-vline,
  WA_CNV_20306_TKA00C-RABWG, sy-vline,
  WA_CNV_20306_TKA00C-OAUFT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CNV_20306_TKA00C 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_CNV_20306_TKA00C 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_CNV_20306_TKA00C INTO WA_CNV_20306_TKA00C.


*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_CNV_20306_TKA00C-GJAHR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CNV_20306_TKA00C-GJAHR.
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_CNV_20306_TKA00C_STR, 
MANDT TYPE STRING,
KOKRS TYPE STRING,
GJAHR TYPE STRING,
KOSTS TYPE STRING,
AUFTR TYPE STRING,
PRJKT TYPE STRING,
ERGBR TYPE STRING,
KKALK TYPE STRING,
HHPLN TYPE STRING,
RABWG TYPE STRING,
OAUFT TYPE STRING,
RMBST TYPE STRING,
MATST TYPE STRING,
RMKAL TYPE STRING,
ANLAA TYPE STRING,
RFKUN TYPE STRING,
RFDIS TYPE STRING,
GLSYS TYPE STRING,
RPPER TYPE STRING,
RVAUF TYPE STRING,
OBLVB TYPE STRING,
RVFAK TYPE STRING,
RFZAL TYPE STRING,
RFANZ TYPE STRING,
ALLEW TYPE STRING,
RKBUK TYPE STRING,
PCRCH TYPE STRING,
KAEIN TYPE STRING,
TEST TYPE STRING,
COABC TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CNV_20306_TKA00C_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_CNV_20306_TKA00C_STR-MANDT sy-vline 
WA_CNV_20306_TKA00C_STR-KOKRS sy-vline 
WA_CNV_20306_TKA00C_STR-GJAHR sy-vline 
WA_CNV_20306_TKA00C_STR-KOSTS sy-vline 
WA_CNV_20306_TKA00C_STR-AUFTR sy-vline 
WA_CNV_20306_TKA00C_STR-PRJKT sy-vline 
WA_CNV_20306_TKA00C_STR-ERGBR sy-vline 
WA_CNV_20306_TKA00C_STR-KKALK sy-vline 
WA_CNV_20306_TKA00C_STR-HHPLN sy-vline 
WA_CNV_20306_TKA00C_STR-RABWG sy-vline 
WA_CNV_20306_TKA00C_STR-OAUFT sy-vline 
WA_CNV_20306_TKA00C_STR-RMBST sy-vline 
WA_CNV_20306_TKA00C_STR-MATST sy-vline 
WA_CNV_20306_TKA00C_STR-RMKAL sy-vline 
WA_CNV_20306_TKA00C_STR-ANLAA sy-vline 
WA_CNV_20306_TKA00C_STR-RFKUN sy-vline 
WA_CNV_20306_TKA00C_STR-RFDIS sy-vline 
WA_CNV_20306_TKA00C_STR-GLSYS sy-vline 
WA_CNV_20306_TKA00C_STR-RPPER sy-vline 
WA_CNV_20306_TKA00C_STR-RVAUF sy-vline 
WA_CNV_20306_TKA00C_STR-OBLVB sy-vline 
WA_CNV_20306_TKA00C_STR-RVFAK sy-vline 
WA_CNV_20306_TKA00C_STR-RFZAL sy-vline 
WA_CNV_20306_TKA00C_STR-RFANZ sy-vline 
WA_CNV_20306_TKA00C_STR-ALLEW sy-vline 
WA_CNV_20306_TKA00C_STR-RKBUK sy-vline 
WA_CNV_20306_TKA00C_STR-PCRCH sy-vline 
WA_CNV_20306_TKA00C_STR-KAEIN sy-vline 
WA_CNV_20306_TKA00C_STR-TEST sy-vline 
WA_CNV_20306_TKA00C_STR-COABC sy-vline      INTO ld_text SEPARATED BY SPACE.

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