ABAP Select data from SAP table CNV_20200_T001AD into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP CNV_20200_T001AD 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_20200_T001AD. 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_20200_T001AD 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_20200_T001AD TYPE STANDARD TABLE OF CNV_20200_T001AD,
      WA_CNV_20200_T001AD TYPE CNV_20200_T001AD,
      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_20200_T001AD> TYPE CNV_20200_T001AD.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_CNV_20200_T001AD.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM CNV_20200_T001AD
  INTO TABLE IT_CNV_20200_T001AD.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CNV_20200_T001AD
*  INTO TABLE @DATA(IT_CNV_20200_T001AD2).
*--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_20200_T001AD INDEX 1 INTO DATA(WA_CNV_20200_T001AD2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_CNV_20200_T001AD ASSIGNING <CNV_20200_T001AD>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CNV_20200_T001AD>-MANDT = 1.
<CNV_20200_T001AD>-PACKID = 1.
<CNV_20200_T001AD>-BUKRS = 1.
<CNV_20200_T001AD>-LAND1 = 1.
<CNV_20200_T001AD>-KTOPL = 1.

ENDLOOP.

LOOP AT IT_CNV_20200_T001AD INTO WA_CNV_20200_T001AD.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CNV_20200_T001AD-PERIV, sy-vline,
  WA_CNV_20200_T001AD-KOKFI, sy-vline,
  WA_CNV_20200_T001AD-RCOMP, sy-vline,
  WA_CNV_20200_T001AD-STCEG, sy-vline,
  WA_CNV_20200_T001AD-FIKRS, sy-vline,
  WA_CNV_20200_T001AD-KKBER, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CNV_20200_T001AD 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_20200_T001AD 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_20200_T001AD INTO WA_CNV_20200_T001AD.


*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 RCOMP
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_CNV_20200_T001AD-RCOMP
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CNV_20200_T001AD-RCOMP.
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_20200_T001AD_STR, 
MANDT TYPE STRING,
PACKID TYPE STRING,
BUKRS TYPE STRING,
LAND1 TYPE STRING,
KTOPL TYPE STRING,
PERIV TYPE STRING,
KOKFI TYPE STRING,
RCOMP TYPE STRING,
STCEG TYPE STRING,
FIKRS TYPE STRING,
KKBER TYPE STRING,
KTOP2 TYPE STRING,
BUKRS_GLOB TYPE STRING,
FSTVA TYPE STRING,
OPVAR TYPE STRING,
UMKRS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CNV_20200_T001AD_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_20200_T001AD_STR-MANDT sy-vline 
WA_CNV_20200_T001AD_STR-PACKID sy-vline 
WA_CNV_20200_T001AD_STR-BUKRS sy-vline 
WA_CNV_20200_T001AD_STR-LAND1 sy-vline 
WA_CNV_20200_T001AD_STR-KTOPL sy-vline 
WA_CNV_20200_T001AD_STR-PERIV sy-vline 
WA_CNV_20200_T001AD_STR-KOKFI sy-vline 
WA_CNV_20200_T001AD_STR-RCOMP sy-vline 
WA_CNV_20200_T001AD_STR-STCEG sy-vline 
WA_CNV_20200_T001AD_STR-FIKRS sy-vline 
WA_CNV_20200_T001AD_STR-KKBER sy-vline 
WA_CNV_20200_T001AD_STR-KTOP2 sy-vline 
WA_CNV_20200_T001AD_STR-BUKRS_GLOB sy-vline 
WA_CNV_20200_T001AD_STR-FSTVA sy-vline 
WA_CNV_20200_T001AD_STR-OPVAR sy-vline 
WA_CNV_20200_T001AD_STR-UMKRS sy-vline      INTO ld_text SEPARATED BY SPACE.

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