ABAP Select data from SAP table CNV_20305_CEPC into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP CNV_20305_CEPC 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_20305_CEPC. 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_20305_CEPC 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_20305_CEPC TYPE STANDARD TABLE OF CNV_20305_CEPC,
      WA_CNV_20305_CEPC TYPE CNV_20305_CEPC,
      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_20305_CEPC> TYPE CNV_20305_CEPC.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_CNV_20305_CEPC.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM CNV_20305_CEPC
  INTO TABLE IT_CNV_20305_CEPC.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CNV_20305_CEPC
*  INTO TABLE @DATA(IT_CNV_20305_CEPC2).
*--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_20305_CEPC INDEX 1 INTO DATA(WA_CNV_20305_CEPC2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_CNV_20305_CEPC ASSIGNING <CNV_20305_CEPC>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CNV_20305_CEPC>-MANDT = 1.
<CNV_20305_CEPC>-PACKID = 1.
<CNV_20305_CEPC>-PRCTR = 1.
<CNV_20305_CEPC>-DATBI = 1.
<CNV_20305_CEPC>-KOKRS = 1.

ENDLOOP.

LOOP AT IT_CNV_20305_CEPC INTO WA_CNV_20305_CEPC.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CNV_20305_CEPC-DATAB, sy-vline,
  WA_CNV_20305_CEPC-ERSDA, sy-vline,
  WA_CNV_20305_CEPC-USNAM, sy-vline,
  WA_CNV_20305_CEPC-MERKMAL, sy-vline,
  WA_CNV_20305_CEPC-ABTEI, sy-vline,
  WA_CNV_20305_CEPC-VERAK, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CNV_20305_CEPC 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_20305_CEPC 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_20305_CEPC INTO WA_CNV_20305_CEPC.


*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 PRCTR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_CNV_20305_CEPC-PRCTR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CNV_20305_CEPC-PRCTR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field NPRCTR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_CNV_20305_CEPC-NPRCTR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CNV_20305_CEPC-NPRCTR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ISOLA, internal->external for field SPRAS
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_CNV_20305_CEPC-SPRAS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CNV_20305_CEPC-SPRAS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field VNAME
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_CNV_20305_CEPC-VNAME
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CNV_20305_CEPC-VNAME.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field RECID
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_CNV_20305_CEPC-RECID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CNV_20305_CEPC-RECID.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ETYPE
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_CNV_20305_CEPC-ETYPE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CNV_20305_CEPC-ETYPE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field LOGSYSTEM
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_CNV_20305_CEPC-LOGSYSTEM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CNV_20305_CEPC-LOGSYSTEM.
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_20305_CEPC_STR, 
MANDT TYPE STRING,
PACKID TYPE STRING,
PRCTR TYPE STRING,
DATBI TYPE STRING,
KOKRS TYPE STRING,
DATAB TYPE STRING,
ERSDA TYPE STRING,
USNAM TYPE STRING,
MERKMAL TYPE STRING,
ABTEI TYPE STRING,
VERAK TYPE STRING,
WAERS TYPE STRING,
NPRCTR TYPE STRING,
LAND1 TYPE STRING,
ANRED TYPE STRING,
NAME1 TYPE STRING,
NAME2 TYPE STRING,
NAME3 TYPE STRING,
NAME4 TYPE STRING,
ORT01 TYPE STRING,
ORT02 TYPE STRING,
STRAS TYPE STRING,
PFACH TYPE STRING,
PSTLZ TYPE STRING,
PSTL2 TYPE STRING,
SPRAS TYPE STRING,
TELBX TYPE STRING,
TELF1 TYPE STRING,
TELF2 TYPE STRING,
TELFX TYPE STRING,
TELTX TYPE STRING,
TELX1 TYPE STRING,
DATLT TYPE STRING,
DRNAM TYPE STRING,
KHINR TYPE STRING,
BUKRS TYPE STRING,
VNAME TYPE STRING,
RECID TYPE STRING,
ETYPE TYPE STRING,
TXJCD TYPE STRING,
REGIO TYPE STRING,
KVEWE TYPE STRING,
KAPPL TYPE STRING,
KALSM TYPE STRING,
LOGSYSTEM TYPE STRING,
LOCK_IND TYPE STRING,
PCA_TEMPLATE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CNV_20305_CEPC_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_20305_CEPC_STR-MANDT sy-vline 
WA_CNV_20305_CEPC_STR-PACKID sy-vline 
WA_CNV_20305_CEPC_STR-PRCTR sy-vline 
WA_CNV_20305_CEPC_STR-DATBI sy-vline 
WA_CNV_20305_CEPC_STR-KOKRS sy-vline 
WA_CNV_20305_CEPC_STR-DATAB sy-vline 
WA_CNV_20305_CEPC_STR-ERSDA sy-vline 
WA_CNV_20305_CEPC_STR-USNAM sy-vline 
WA_CNV_20305_CEPC_STR-MERKMAL sy-vline 
WA_CNV_20305_CEPC_STR-ABTEI sy-vline 
WA_CNV_20305_CEPC_STR-VERAK sy-vline 
WA_CNV_20305_CEPC_STR-WAERS sy-vline 
WA_CNV_20305_CEPC_STR-NPRCTR sy-vline 
WA_CNV_20305_CEPC_STR-LAND1 sy-vline 
WA_CNV_20305_CEPC_STR-ANRED sy-vline 
WA_CNV_20305_CEPC_STR-NAME1 sy-vline 
WA_CNV_20305_CEPC_STR-NAME2 sy-vline 
WA_CNV_20305_CEPC_STR-NAME3 sy-vline 
WA_CNV_20305_CEPC_STR-NAME4 sy-vline 
WA_CNV_20305_CEPC_STR-ORT01 sy-vline 
WA_CNV_20305_CEPC_STR-ORT02 sy-vline 
WA_CNV_20305_CEPC_STR-STRAS sy-vline 
WA_CNV_20305_CEPC_STR-PFACH sy-vline 
WA_CNV_20305_CEPC_STR-PSTLZ sy-vline 
WA_CNV_20305_CEPC_STR-PSTL2 sy-vline 
WA_CNV_20305_CEPC_STR-SPRAS sy-vline 
WA_CNV_20305_CEPC_STR-TELBX sy-vline 
WA_CNV_20305_CEPC_STR-TELF1 sy-vline 
WA_CNV_20305_CEPC_STR-TELF2 sy-vline 
WA_CNV_20305_CEPC_STR-TELFX sy-vline 
WA_CNV_20305_CEPC_STR-TELTX sy-vline 
WA_CNV_20305_CEPC_STR-TELX1 sy-vline 
WA_CNV_20305_CEPC_STR-DATLT sy-vline 
WA_CNV_20305_CEPC_STR-DRNAM sy-vline 
WA_CNV_20305_CEPC_STR-KHINR sy-vline 
WA_CNV_20305_CEPC_STR-BUKRS sy-vline 
WA_CNV_20305_CEPC_STR-VNAME sy-vline 
WA_CNV_20305_CEPC_STR-RECID sy-vline 
WA_CNV_20305_CEPC_STR-ETYPE sy-vline 
WA_CNV_20305_CEPC_STR-TXJCD sy-vline 
WA_CNV_20305_CEPC_STR-REGIO sy-vline 
WA_CNV_20305_CEPC_STR-KVEWE sy-vline 
WA_CNV_20305_CEPC_STR-KAPPL sy-vline 
WA_CNV_20305_CEPC_STR-KALSM sy-vline 
WA_CNV_20305_CEPC_STR-LOGSYSTEM sy-vline 
WA_CNV_20305_CEPC_STR-LOCK_IND sy-vline 
WA_CNV_20305_CEPC_STR-PCA_TEMPLATE sy-vline      INTO ld_text SEPARATED BY SPACE.

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